diary

Text-based journaling program
git clone https://git.in0rdr.ch/diary.git
Log | Files | Refs | README | LICENSE
commit 11a703c761c6ffea6d7237688245f4be492d52bb
parent f7ca86d4c2b5bbbad94d6ab8db7c46c31f4603ca
Author: Andreas Gruhler <agruhl@gmx.ch>
Date:   Sun,  4 Jul 2021 18:55:54 +0200

Merge pull request #74 from in0rdr/feature/caldav

Feature/caldav
Diffstat:

M.gitignore | 1+


MMakefile | 16++++++++++------


MREADME.md | 91++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----------------


ATESTING.md | 33+++++++++++++++++++++++++++++++++


Aconfig/diary.cfg | 17+++++++++++++++++


Ddiary-cheat-sheet.png | 0


Ddiary.1 | 192-------------------------------------------------------------------------------


Ddiary.c | 719-------------------------------------------------------------------------------


Ddiary.cfg | 11-----------


Ddiary.h | 65-----------------------------------------------------------------


Rdemo.gif -> img/demo.gif | 0


Aimg/diary-cheat-sheet.png | 0


Aimg/diary-worm.png | 0


Aimg/diary-worm.svg | 1209+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Aman/diary.1 | 203+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Aman/diary.1.html | 319+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Asrc/caldav.c | 877+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Asrc/caldav.h | 54++++++++++++++++++++++++++++++++++++++++++++++++++++++


Asrc/diary.c | 687+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Asrc/diary.h | 39+++++++++++++++++++++++++++++++++++++++


Asrc/utils.c | 335+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Asrc/utils.h | 58++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


22 files changed, 3914 insertions(+), 1012 deletions(-)

diff --git a/.gitignore b/.gitignore
@@ -1,3 +1,4 @@
 diary
 *.o
 *.gch
+*.swp
diff --git a/Makefile b/Makefile
@@ -1,25 +1,29 @@
 TARGET = diary
-SRC = diary.c
+SRCDIR = src/
+_SRC = utils.c caldav.c diary.c
+SRC = $(addprefix $(SRCDIR), $(_SRC))
 PREFIX ?= /usr/local
 BINDIR ?= $(DESTDIR)$(PREFIX)/bin
 
 MANDIR := $(DESTDIR)$(PREFIX)/share/man
-MAN1 = diary.1
+MAN1 = man/diary.1
 
 CC = gcc
-CFLAGS = -Wall
+CFLAGS = -Wall \
+         -DGOOGLE_OAUTH_CLIENT_ID=\"$(GOOGLE_OAUTH_CLIENT_ID)\" \
+         -DGOOGLE_OAUTH_CLIENT_SECRET=\"$(GOOGLE_OAUTH_CLIENT_SECRET)\"
 UNAME = ${shell uname}
 
 ifeq ($(UNAME),FreeBSD)
-	LIBS = -lncurses
+	LIBS = -lncurses -lcurl -lpthread
 endif
 
 ifeq ($(UNAME),Linux)
-	LIBS = -lncursesw
+	LIBS = -lncursesw -lcurl -lpthread
 endif
 
 ifeq ($(UNAME),Darwin)
-	LIBS = -lncurses -framework CoreFoundation
+	LIBS = -lncurses -lcurl -lpthread -framework CoreFoundation
 endif
 
 
diff --git a/README.md b/README.md
@@ -1,8 +1,13 @@
-# CLI Diary
+<p align="center">
+<img src="./img/diary-worm.png" width="250px" />
+</p>
 
-This is a text based diary, inspired by [khal](https://github.com/pimutils/khal). Diary entries are stored in raw text. You may say C & ncurses are old, I say paper is older..
+# Diary
 
-![Diary Demo](https://raw.githubusercontent.com/in0rdr/diary/master/demo.gif)
+This is a text-based diary, inspired by [khal](https://github.com/pimutils/khal). Journal entries are stored in text files.
+
+## Demo
+![Diary Demo](https://raw.githubusercontent.com/in0rdr/diary/master/img/demo.gif)
 
 ## Usage
 1. Set the EDITOR environment variable to your favourite text editor:
@@ -24,29 +29,29 @@ This is a text based diary, inspired by [khal](https://github.com/pimutils/khal)
 3. Use the keypad or VIM-like shortcuts to move between dates:
 
     ```
-    e, Enter  Edit the current entry
-    d, x      Delete/remove current entry
-    t         Jump to today
-    s         Jump to specific day
+    e, Enter  edit current entry
+    d, x      delete current entry
+    s         sync current entry with CalDAV server
+
+    t         jump to today
+    f         jump to or find specific day
 
     j, down   go forward by 1 week
     k, up     go backward by 1 week
     h, left   go left by 1 day
     l, right  go right by 1 day
+    J         go forward by 1 month
+    K         go backward by 1 month
 
-    N         go to the previous diary entry
-    n         go to the next diary entry
-
+    N         go to the previous journal entry
+    n         go to the next journal entry
     g         go to start of journal
     G         go to end of journal
 
-    J         Go forward by 1 month
-    K         Go backward by 1 month
-
     q         quit the program
     ```
 
-![diary cheet sheet](https://raw.githubusercontent.com/in0rdr/diary/master/diary-cheat-sheet.png)
+![diary cheet sheet](https://raw.githubusercontent.com/in0rdr/diary/master/img/diary-cheat-sheet.png)
 
 ## Install
 
@@ -65,14 +70,21 @@ Server = https://downloadcontent.opensuse.org/repositories/home:/in0rdr/Arch/$ar
 ## Build
 [![Build Status](https://travis-ci.org/in0rdr/diary.svg?branch=master)](https://travis-ci.org/in0rdr/diary)
 
+1. Define [OAuth2 application credentials](https://developers.google.com/identity/protocols/oauth2) if CalDAV sync should be effective:
+    ```
+    export GOOGLE_OAUTH_CLIENT_ID=""
+    export GOOGLE_OAUTH_CLIENT_SECRET=""
+    ```
+
+    Alternatively, leave these two variables unset and [define the clientid/secret in the configuration file](#Google-Calendar-OAuth2) at run-time.
 
-1. Compile (requires ncurses):
+2. Compile (requires ncurses and libcurl):
     ```
     make
     ```
 Note: for *BSD users run gmake.
 
-2. Install the binary (optional):
+3. Install the binary (optional):
     ```
     sudo make install
     ```
@@ -83,10 +95,10 @@ Note: for *BSD users run gmake.
 
 ## Configuration File
 
-The [`diary.cfg`](./diary.cfg) configuration file can optionally be used to persist diary configuration. To install the sample from this repository:
+The [`diary.cfg`](./config/diary.cfg) configuration file can optionally be used to persist diary configuration. To install the sample from this repository:
 ```bash
 mkdir -p ${XDG_CONFIG_HOME:-~/.config}/diary
-cp diary.cfg ${XDG_CONFIG_HOME:-~/.config}/diary/
+cp config/diary.cfg ${XDG_CONFIG_HOME:-~/.config}/diary/
 ```
 
 The file `${XDG_CONFIG_HOME:-~/.config}/diary/diary.cfg` should adhere to a basic `key = value` format. Lines can be commented with the special characters `#` or `;`. The following configuration keys are currently supported:
@@ -94,10 +106,14 @@ The file `${XDG_CONFIG_HOME:-~/.config}/diary/diary.cfg` should adhere to a basi
 | Command Line Option | Config Key | Example Config Value | Default Config Value | Description |
 | --- | --- | --- | --- | --- |
 | `--dir`, `-d`, or first non-option argument | `dir` | ~/diary | n/a | Diary directory. Path that holds the journal text files. If unset, defaults to environment variable `$DIARY_DIR`.|
-| `--editor` or `-e` | `editor` | "vim" | "" | Editor to open journal files with. If unset, defaults to environment variable `$EDITOR`. If no editor is provided, the diary is opened read-only. |
+| `--editor` or `-e` | `editor` | vim | (empty) | Editor to open journal files with. If unset, defaults to environment variable `$EDITOR`. If no editor is provided, the diary is opened read-only. |
 | `--fmt` or `-f` | `fmt` | %d_%b_%y | %Y-%m-%d | Date format and file name for the files inside the `dir`. For the format specifiers, see [`man strftime`](https://man7.org/linux/man-pages/man3/strftime.3.html). Be careful: If you change this, you might no longer find your existing diary entries, because the diary assumes to find the journal files under another file name. Hence, a change in FMT shows an empty diary, at first. Rename all files in the DIARY_DIR to migrate to a new FMT. |
 | `--range` or `-r` | `range` | 10 | 1 | Number of years to show before/after todays date |
 | `--weekday` or `-w` | `weekday` | 0 | 1 | First weekday, `7` = Sunday, `1` = Monday, ..., `6` = Saturday. Use `7` (or `0`) to display week beginning at Sunday ("S-M-T-W-T-F-S"), or `1` for "M-T-W-T-F-S-S". If `glibc` is installed, the first day of the week is derived from the current locale setting (`$LANG`, see `man locale`). Without `glibc`, the first weekday defaults to 1 (Monday), unless specified otherwise with this option. |
+| n/a | `google_calendar` | diary | (empty) | Displayname of Google Calendar for [CalDAV sync](#CalDAV-sync) |
+| n/a | `google_clientid` | 123-123.apps.googleusercontent.com | [built-in](#Build) / (empty) | Google Calendar for [Google Calendar OAuth2](#Google-Calendar-OAuth2) clientid |
+| n/a | `google_secretid` | 321 | [built-in](#Build) / (empty) |  Google Calendar for [Google Calendar OAuth2](#Google-Calendar-OAuth2) secretid |
+| n/a | `google_tokenfile` | ~/.diary-token | ~/.diary-token | Displayname of Google Calendar for [Google Calendar OAuth2](#Google-Calendar-OAuth2) API token file|
 
 ## Precedence Rules
 <a name="precedence_rules"></a>
@@ -137,3 +153,40 @@ $ rm ${XDG_CONFIG_HOME:-~/.config}/diary/diary.cfg
 # start with 'weekday' default value from source code (1=Mon)
 $ diary
 ```
+
+## CalDAV Sync
+The journal files can be synced via CalDAV. Currently, only the Google Calendar is supported as remote provider. Please open an [issue](https://github.com/in0rdr/diary/issues) to implement support for additional remote calendar servers.
+
+
+The calender for synchronization can be defined with the [configuration](#Configuration-File) key `google_calendar`:
+```
+# Google calendar name for CalDAV sync
+google_calendar = example
+```
+
+This key is empty by default and the only configuration key required for setting up synchronization.
+
+### Google Calendar OAuth2
+
+The Google Calendar CalDAV API is protected with OAuth2.
+
+The [packaged binaries](#Install) ship with predefined app credentials (clientid/secretid) and consent screen.
+
+The credentials and the consent screen can be redefined at [compile time](#Build) or with the following keys in the [configuration file](#Configuration-File):
+
+```
+# Google OAuth2 clientid and secretid
+google_clientid = 123-123.apps.googleusercontent.com
+google_secretid = 321
+```
+
+The token used to authenticate with the Google API is stored in the file specified by `google_tokenfile` (defaults to `~/.diary-token`):
+```
+# Google OAuth2 tokenfile
+google_tokenfile = ~/.diary-token
+```
+
+The application requires two [OAuth2 scopes](https://developers.google.com/calendar/auth) for CalDAV requests:
+
+1. `https://www.googleapis.com/auth/calendar`: read/write access to Calendars - required to discover the unique hyperlink/URI for the calendar specified by the [configuration key](#Configuration-File) `google_calendar`
+2. `https://www.googleapis.com/auth/calendar.events.owned`: read/write access to Events owned by the user - allows diary to create/read/update/delete events in `google_calendar`
diff --git a/TESTING.md b/TESTING.md
@@ -0,0 +1,33 @@
+# Testing
+
+This file holds notes for testing purposes.
+
+## Render Documentation / Man Page
+
+### Plain Text
+Generate plain text from "runoff" text:
+```bash
+tbl man/diary.1 | nroff -man | less
+```
+
+### `mandoc` HTML (preferred)
+Install [`mandoc`](https://en.wikipedia.org/wiki/Mandoc):
+```bash
+sudo apt-get install mandoc
+```
+
+Generate HTML file:
+```bash
+mandoc -Thtml man/diary.1 > man/diary.1.html
+```
+
+### `groff` HTML
+Install [`groff`](https://www.gnu.org/software/groff):
+```bash
+sudo apt-get install groff
+```
+
+Generate HTML file (`-t` for `tbl`):
+```bash
+groff -t -mandoc -Thtml man/diary.1 > man/diary.1.html
+```
diff --git a/config/diary.cfg b/config/diary.cfg
@@ -0,0 +1,17 @@
+# Path that holds the journal text files
+#dir = ~/diary
+# Number of years to show before/after todays date
+range = 1
+# 0 = Sunday, 1 = Monday, ..., 6 = Saturday
+weekday = 1
+# Date and file format, change with care
+fmt = %Y-%m-%d
+# Editor to open journal files with
+editor =
+# Google calendar name for CalDAV sync
+#google_calendar =
+# Google OAuth2 clientid and secretid
+#google_clientid =
+#google_secretid =
+# Google OAuth2 tokenfile
+#google_tokenfile = ~/.diary-token
diff --git a/diary-cheat-sheet.png b/diary-cheat-sheet.png
Binary files differ.
diff --git a/diary.1 b/diary.1
@@ -1,192 +0,0 @@
-.TH DIARY 1
-.SH NAME
-diary \- Simple text-based diary program
-
-.SH SYNOPSIS
-.B diary
-[\fIOPTION\fR]... [\fIDIRECTORY\fR]...
-.br
-
-.SH DESCRIPTION
-.B diary
-is a simple text-based program for managing journal entries.
-
-.SH OPTIONS
-.TP
-\fB\-v\fR, \fB\-\-version\fR
-Print diary version
-.TP
-\fB\-h\fR, \fB\-\-help\fR
-Show diary help text
-.TP
-\fB\-d\fR, \fB\-\-dir\fR=\fI\,DIARY_DIR\/\fR
-Diary storage directory DIARY_DIR
-.TP
-\fB\-e\fR, \fB\-\-editor\fR=\fI\,EDITOR\/\fR
-EDITOR is the text editor used for opening the journal files.
-.TP
-\fB\-f\fR, \fB\-\-fmt\fR=\fI\,FMT\/\fR
-FMT is a custom date and file format. Change with care, because the diary
-reads and writes to files with file name FMT. The new FMT is only
-applied to newly saved entries. Existing entries with the old FMT are not
-automatically migrated to the new FMT and do not show up with a new FMT
-specifier. Consequently, a change in FMT shows an empty diary at first.
-Rename all files in the DIARY_DIR to migrate to a new FMT.
-.TP
-\fB\-r\fR, \fB\-\-range\fR=\fI\,RANGE\/\fR
-RANGE is the number of years to show before/after todays date. Defaults to 1 year.
-.TP
-\fB\-f\fR, \fB\-\-weekday\fR=\fI\,DAY\/\fR
-First day of the week. DAY is an integer in range (0..6), interpreted as 0 or 7 = Sun,
-1 = Mon, ..., 6 = Sat. If glibc is installed, the first day of the week is derived
-from the current locale setting ('$LANG', see man locale). Without glibc, the
-first weekday defaults to 1 (Monday), unless specified otherwise with this option.
-
-.SH NAVIGATION
-Navigation is done using the following vim-inspired keyboard shortcuts:
-
-.TS
-tab(|);
-l l.
-Key(s)    | Action
-======    | ======
-k, up     | go backward by 1 week
-j, down   | go forward by 1 week
-h, left   | go backward by 1 day
-l, right  | go forward by 1 day
-J         | go forward by 1 month
-K         | go backward by 1 month
-
-e, enter  | edit current entry
-d, x      | delete current entry
-q         | quit the program
-
-N         | go to the previous journal entry
-n         | go to the next journal entry
-g         | go to start of journal
-G         | go to end of journal
-
-t         | jump to today
-s         | jump to specific day
-.TE
-
-.SH ENVIRONMENT
-
-.IP DIARY_DIR
-If this variable is set to a directory that can be opened,
-.B diary
-will use it to store diary files. Diary files are simple text files named
-after their date, formatted according to FMT (see '-f'/'--fmt' options and
-'fmt' config key). The format defaults to "%Y-%m-%d", which is "YYYY-MM-DD"
-(see man strftime). All other files different from FMT are ignored.
-
-.IP EDITOR
-The program used to edit journal entries.
-
-.IP LANG
-The default locale used to display the first day of the week.
-
-.SH ARGUMENTS
-
-If the argument \fIDIRECTORY\fR is given, diary files are read from and
-stored to that directory, ignoring the DIARY_DIR environment variable,
-any '-d'/'--dir' options or the 'dir' value set in the config file.
-
-.SH FILES
-.TP
-.I ${PREFIX:-/usr/local/bin}/diary
-The diary binary
-.TP
-.I ${XDG_CONFIG_HOME:-~/.config}/diary/diary.cfg
-An optional diary configuration file
-
-.SH CONFIGURATION FILE
-The diary.cfg configuration file can optionally be used to persist diary configuration.
-
-Create default config location:
-
-.nf
- $ mkdir -p ${XDG_CONFIG_HOME:-~/.config}/diary
-.fi
-
-Install an example config file with defaults:
-
-.nf
- $ echo '# Path that holds the journal text files
- #dir = ~/diary
- # Number of years to show before/after todays date
- range = 1
- # 0 = Sunday, 1 = Monday, ..., 6 = Saturday
- weekday = 1
- # Date and file format, change with care
- fmt = %Y-%m-%d
- # Editor to open journal files with
- editor = ""' | sed 's/^[[:space:]]*//' > ${XDG_CONFIG_HOME:-~/.config}/diary/diary.cfg
-.fi
-
-Use the '#' or ';' characters to comment lines.
-
-.SH PRECEDENCE RULES
-
-The default variables, for instance, for the configuration variables 'editor', 'dir' and 'weekday', are populated with values in the following order:
-
-.TP
-1.
-No default for 'DIARY_DIR'. Defaults for 'range', 'weekday', 'fmt' and 'editor' are provided in 'diary.h'. If 'EDITOR' is unset and no editor is provided in the config file or via the '-e' option, the
-.B
-diary
-works read-only. Journal files cannot be opened. If 'DIARY_DIR' is not provided, the
-.B
-diary
-won't open.
-.TP
-2.
-.B
-Config file
-(empty default for 'editor', no default for 'dir')
-.TP
-3.
-.B
-Environment
-variables '$DIARY_DIR', '$EDITOR' and '$LANG' for locale ('weekday')
-.TP
-4.
-.B
-Option
-arguments, see section
-.B
-OPTIONS
-.TP
-5.
-First non-option argument \fIDIRECTORY\fR is interpreted as 'DIARY_DIR'
-
-.SH PRECEDENCE EXAMPLE: LOCALE AND FIRST DAY OF WEEK
-If glibc is installed, the first weekday defaults to the locale defined in the current shell
-environment ($LANG, see man locale), unless specified otherwise via the '--weekday'/'-w'.
-
-.nf
- # start with weekday=3(Wed), overrule any other configuration value
- $ diary -w3
-
- # start with glibc derived weekday=1, regardless of 'weekday' in config file
- $ LANG=de_CH diary
-
- # if glibc is installed, start with glibc derived base date (weekday=0)
- $ LANG= diary
-
- # disable environment variable, default to value from config file
- $ unset LANG
-
- # start with 'weekday' default from config file, if available
- $ diary
-
- # remove config file
- $ rm ${XDG_CONFIG_HOME:-~/.config}/diary/diary.cfg
-
- # start with 'weekday' default value from source code (1=Mon)
- $ diary
-.fi
-
-.SH DEVELOPMENT
-All source code is available in this github repository:
-<https://github.com/in0rdr/diary/>. Contributions are always welcome!
diff --git a/diary.c b/diary.c
@@ -1,719 +0,0 @@
-#include "diary.h"
-
-int cy, cx;
-time_t raw_time;
-struct tm today;
-struct tm curs_date;
-struct tm cal_start;
-struct tm cal_end;
-
-// normally leap is every 4 years,
-// but is skipped every 100 years,
-// unless it is divisible by 400
-#define is_leap(yr) ((yr % 400 == 0) || (yr % 4 == 0 && yr % 100 != 0))
-
-void setup_cal_timeframe()
-{
-    raw_time = time(NULL);
-    localtime_r(&raw_time, &today);
-    curs_date = today;
-
-    cal_start = today;
-    cal_start.tm_year -= CONFIG.range;
-    cal_start.tm_mon = 0;
-    cal_start.tm_mday = 1;
-    mktime(&cal_start);
-
-    if (cal_start.tm_wday != CONFIG.weekday) {
-        // adjust start date to weekday before 01.01
-        cal_start.tm_year--;
-        cal_start.tm_mon = 11;
-        cal_start.tm_mday = 31 - (cal_start.tm_wday - CONFIG.weekday) + 1;
-        mktime(&cal_start);
-    }
-
-    cal_end = today;
-    cal_end.tm_year += CONFIG.range;
-    cal_end.tm_mon = 11;
-    cal_end.tm_mday = 31;
-    mktime(&cal_end);
-}
-
-void draw_wdays(WINDOW* head)
-{
-    int i;
-    for (i = CONFIG.weekday; i < CONFIG.weekday + 7; i++) {
-        waddstr(head, WEEKDAYS[i % 7]);
-        waddch(head, ' ');
-    }
-    wrefresh(head);
-}
-
-void draw_calendar(WINDOW* number_pad, WINDOW* month_pad, const char* diary_dir, size_t diary_dir_size)
-{
-    struct tm i = cal_start;
-    char month[10];
-    bool has_entry;
-
-    while (mktime(&i) <= mktime(&cal_end)) {
-        has_entry = date_has_entry(diary_dir, diary_dir_size, &i);
-
-        if (has_entry)
-            wattron(number_pad, A_BOLD);
-
-        wprintw(number_pad, "%2i", i.tm_mday);
-
-        if (has_entry)
-            wattroff(number_pad, A_BOLD);
-
-        waddch(number_pad, ' ');
-
-        // print month in sidebar
-        if (i.tm_mday == 1) {
-            strftime(month, sizeof month, "%b", &i);
-            getyx(number_pad, cy, cx);
-            mvwprintw(month_pad, cy, 0, "%s ", month);
-        }
-
-        i.tm_mday++;
-        mktime(&i);
-    }
-}
-
-/* Update the header with the cursor date */
-void update_date(WINDOW* header)
-{
-    char dstr[16];
-    mktime(&curs_date);
-    get_date_str(&curs_date, dstr, sizeof dstr);
-
-    wclear(header);
-    mvwaddstr(header, 0, 0, dstr);
-    wrefresh(header);
-}
-
-bool go_to(WINDOW* calendar, WINDOW* aside, time_t date, int* cur_pad_pos)
-{
-    if (date < mktime(&cal_start) || date > mktime(&cal_end))
-        return false;
-
-    int diff_seconds = date - mktime(&cal_start);
-    int diff_days = diff_seconds / 60 / 60 / 24;
-    int diff_weeks = diff_days / 7;
-    int diff_wdays = diff_days % 7;
-
-    localtime_r(&date, &curs_date);
-
-    getyx(calendar, cy, cx);
-
-    // remove the STANDOUT attribute from the day we are leaving
-    chtype current_attrs = mvwinch(calendar, cy, cx) & A_ATTRIBUTES;
-    // leave every attr as is, but turn off STANDOUT
-    current_attrs &= ~A_STANDOUT;
-    mvwchgat(calendar, cy, cx, 2, current_attrs, 0, NULL);
-
-    // add the STANDOUT attribute to the day we are entering
-    chtype new_attrs =  mvwinch(calendar, diff_weeks, diff_wdays * 3) & A_ATTRIBUTES;
-    new_attrs |= A_STANDOUT;
-    mvwchgat(calendar, diff_weeks, diff_wdays * 3, 2, new_attrs, 0, NULL);
-
-    if (diff_weeks < *cur_pad_pos)
-        *cur_pad_pos = diff_weeks;
-    if (diff_weeks > *cur_pad_pos + LINES - 2)
-        *cur_pad_pos = diff_weeks - LINES + 2;
-    prefresh(aside, *cur_pad_pos, 0, 1, 0, LINES - 1, ASIDE_WIDTH);
-    prefresh(calendar, *cur_pad_pos, 0, 1, ASIDE_WIDTH, LINES - 1, ASIDE_WIDTH + CAL_WIDTH);
-
-    return true;
-}
-
-/* Update window 'win' with diary entry from date 'date' */
-void display_entry(const char* dir, size_t dir_size, const struct tm* date, WINDOW* win, int width)
-{
-    char path[100];
-    char* ppath = path;
-    int c;
-
-    // get entry path
-    fpath(dir, dir_size, date, &ppath, sizeof path);
-    if (ppath == NULL) {
-        fprintf(stderr, "Error while retrieving file path for diary reading");
-        return;
-    }
-
-    wclear(win);
-
-    if (date_has_entry(dir, dir_size, date)) {
-        FILE* fp = fopen(path, "r");
-        if (fp == NULL) perror("Error opening file");
-
-        wmove(win, 0, 0);
-        while((c = getc(fp)) != EOF) waddch(win, c);
-
-        fclose(fp);
-    }
-
-    wrefresh(win);
-}
-
-/* Writes edit command for 'date' entry to 'rcmd'. '*rcmd' is NULL on error. */
-void edit_cmd(const char* dir, size_t dir_size, const struct tm* date, char** rcmd, size_t rcmd_size)
-{
-    // set the edit command to env editor
-    if (strlen(CONFIG.editor) + 2 > rcmd_size) {
-        fprintf(stderr, "Binary path of default editor too long");
-        *rcmd = NULL;
-        return;
-    }
-    strcpy(*rcmd, CONFIG.editor);
-    strcat(*rcmd, " ");
-
-    // get path of entry
-    char path[100];
-    char* ppath = path;
-    fpath(dir, dir_size, date, &ppath, sizeof path);
-
-    if (ppath == NULL) {
-        fprintf(stderr, "Error while retrieving file path for editing");
-        *rcmd = NULL;
-        return;
-    }
-
-    // concatenate editor command with entry path
-    if (strlen(*rcmd) + strlen(path) + 1 > rcmd_size) {
-        fprintf(stderr, "Edit command too long");
-        return;
-    }
-    strcat(*rcmd, path);
-}
-
-bool date_has_entry(const char* dir, size_t dir_size, const struct tm* i)
-{
-    char epath[100];
-    char* pepath = epath;
-
-    // get entry path and check for existence
-    fpath(dir, dir_size, i, &pepath, sizeof epath);
-
-    if (pepath == NULL) {
-        fprintf(stderr, "Error while retrieving file path for checking entry existence");
-        return false;
-    }
-
-    return (access(epath, F_OK) != -1);
-}
-
-void get_date_str(const struct tm* date, char* date_str, size_t date_str_size)
-{
-    strftime(date_str, date_str_size, CONFIG.fmt, date);
-}
-
-/* Writes file path for 'date' entry to 'rpath'. '*rpath' is NULL on error. */
-void fpath(const char* dir, size_t dir_size, const struct tm* date, char** rpath, size_t rpath_size)
-{
-    // check size of result path
-    if (dir_size + 1 > rpath_size) {
-        fprintf(stderr, "Directory path too long");
-        *rpath = NULL;
-        return;
-    }
-
-    // add path of the diary dir to result path
-    strcpy(*rpath, dir);
-
-    // check for terminating '/' in path
-    if (dir[dir_size - 1] != '/') {
-        // check size again to accommodate '/'
-        if (dir_size + 1 > rpath_size) {
-            fprintf(stderr, "Directory path too long");
-            *rpath = NULL;
-            return;
-        }
-        strcat(*rpath, "/");
-    }
-
-    char dstr[16];
-    get_date_str(date, dstr, sizeof dstr);
-
-    // append date to the result path
-    if (strlen(*rpath) + strlen(dstr) > rpath_size) {
-        fprintf(stderr, "File path too long");
-        *rpath = NULL;
-        return;
-    }
-    strcat(*rpath, dstr);
-}
-
-/*
- * Finds the date with a diary entry closest to <current>.
- * Depending on <search_backwards>, it will find the most recent
- * previous date or the oldest next date with an entry. If no
- * entry is found within the calendar size, <current> is returned.
- */
-struct tm find_closest_entry(const struct tm current,
-                             bool search_backwards,
-                             const char* diary_dir,
-                             size_t diary_dir_size)
-{
-    time_t end_time = mktime(&cal_end);
-    time_t start_time = mktime(&cal_start);
-
-    int step = search_backwards ? -1 : +1;
-
-    struct tm it = current;
-    it.tm_mday += step;
-    time_t it_time = mktime(&it);
-
-    for( ; it_time >= start_time && it_time <= end_time; it_time = mktime(&it)) {
-
-        if (date_has_entry(diary_dir, diary_dir_size, &it)) {
-            return it;
-        }
-        it.tm_mday += step;
-    }
-
-    return current;
-}
-
-bool read_config(const char* file_path)
-{
-    wordexp_t config_file_path_wordexp;
-    char config_file_path[256];
-
-    if ( wordexp( file_path, &config_file_path_wordexp, 0 ) == 0) {
-        if (strlen(config_file_path_wordexp.we_wordv[0]) + 1 > sizeof config_file_path) {
-            fprintf(stderr, "Config file path '%s' too long\n", config_file_path_wordexp.we_wordv[0]);
-            return false;
-        }
-        strcpy(config_file_path, config_file_path_wordexp.we_wordv[0]);
-    }
-    wordfree(&config_file_path_wordexp);
-
-    // check if config file is readable
-    if( access( config_file_path, R_OK ) != 0 ) {
-        fprintf(stderr, "Config file '%s' not readable, skipping\n", config_file_path);
-        return false;
-    }
-
-    char key_buf[80];
-    char value_buf[80];
-    char line[256];
-    FILE * pfile;
-
-    // read config file line by line
-    pfile = fopen(config_file_path, "r");
-    while (fgets(line, sizeof line, pfile)) {
-        // ignore comment lines
-        if (*line == '#' || *line == ';') continue;
-
-        if (sscanf(line, "%s = %s", key_buf, value_buf) == 2) {
-            if (strcmp("dir", key_buf) == 0) {
-                wordexp_t diary_dir_wordexp;
-                if ( wordexp( value_buf, &diary_dir_wordexp, 0 ) == 0) {
-                    // set expanded diary directory path from config file
-                    CONFIG.dir = (char *) calloc(strlen(diary_dir_wordexp.we_wordv[0]) + 1, sizeof(char));
-                    strcpy(CONFIG.dir, diary_dir_wordexp.we_wordv[0]);
-                }
-                wordfree(&diary_dir_wordexp);
-            } else if (strcmp("range", key_buf) == 0) {
-                CONFIG.range = atoi(value_buf);
-            } else if (strcmp("weekday", key_buf) == 0) {
-                CONFIG.weekday = atoi(value_buf);
-            } else if (strcmp("fmt", key_buf) == 0) {
-                CONFIG.fmt = (char *) malloc(strlen(value_buf) + 1 * sizeof(char));
-                strcpy(CONFIG.fmt, value_buf);
-            } else if (strcmp("editor", key_buf) == 0) {
-                CONFIG.editor = (char *) malloc(strlen(value_buf) + 1 * sizeof(char));
-                strcpy(CONFIG.editor, value_buf);
-            }
-        }
-    }
-    fclose (pfile);
-    return true;
-}
-
-void usage() {
-  printf("Usage : diary [OPTION]... [DIRECTORY]...\n");
-  printf("\n");
-  printf("Simple CLI diary (v%s)\n", DIARY_VERSION);
-  printf("Edit journal entries from the command line\n");
-  printf("\n");
-  printf("Options:\n");
-  printf("  -v, --version                 : Print diary version\n");
-  printf("  -h, --help                    : Show diary help text\n");
-  printf("  -d, --dir           DIARY_DIR : Diary storage directory DIARY_DIR\n");
-  printf("  -e, --editor        EDITOR    : Editor to open journal files with\n");
-  printf("  -f, --fmt           FMT       : Date and file format, change with care\n");
-  printf("  -r, --range         RANGE     : RANGE is the number of years to show before/after today's date\n");
-  printf("  -w, --weekday       DAY       : First day of the week, 0 = Sun, 1 = Mon, ..., 6 = Sat\n");
-  printf("\n");
-  printf("Full docs and keyboard shortcuts: 'man diary'\n");
-  printf("or online via: <https://github.com/in0rdr/diary>\n");
-}
-
-int main(int argc, char** argv) {
-    setlocale(LC_ALL, "");
-    char* env_var;
-    char* config_home;
-    char* config_file_path;
-    chtype atrs;
-
-    // the diary directory defaults to the diary_dir specified in the config file
-    config_home = getenv("XDG_CONFIG_HOME");
-    if (config_home == NULL) config_home = XDG_CONFIG_HOME_FALLBACK;
-    // concat config home with the file path to the config file
-    config_file_path = (char *) calloc(strlen(config_home) + strlen(CONFIG_FILE_PATH) + 1, sizeof(char));
-    sprintf(config_file_path, "%s/%s", config_home, CONFIG_FILE_PATH);
-    // read config from config file path
-    read_config(config_file_path);
-
-    // get diary directory from environment
-    env_var = getenv("DIARY_DIR");
-    if (env_var != NULL) {
-        // if available, overwrite the diary directory with the environment variable
-        CONFIG.dir = (char *) calloc(strlen(env_var) + 1, sizeof(char));
-        strcpy(CONFIG.dir, env_var);
-    }
-
-    // get editor from environment
-    env_var = getenv("EDITOR");
-    if (env_var != NULL) {
-        // if available, overwrite the editor with the environments EDITOR
-        CONFIG.editor = (char *) calloc(strlen(env_var) + 1, sizeof(char));
-        strcpy(CONFIG.editor, env_var);
-    }
-
-    // get locale from environment variable LANG
-    // https://www.gnu.org/software/gettext/manual/html_node/Locale-Environment-Variables.html
-    env_var = getenv("LANG");
-    if (env_var != NULL) {
-        // if available, overwrite the editor with the environments locale
-        #ifdef __GNU_LIBRARY__
-            // references: locale(5) and util-linux's cal.c
-            // get the base date, 8-digit integer (YYYYMMDD) returned as char *
-            #ifdef _NL_TIME_WEEK_1STDAY
-                unsigned long d = (uintptr_t) nl_langinfo(_NL_TIME_WEEK_1STDAY);
-            // reference: https://sourceware.org/glibc/wiki/Locales
-            // assign a static date value 19971130 (a Sunday)
-            #else
-                unsigned long d = 19971130;
-            #endif
-            struct tm base = {
-                .tm_sec = 0,
-                .tm_min = 0,
-                .tm_hour = 0,
-                .tm_mday = d % 100,
-                .tm_mon = (d / 100) % 100 - 1,
-                .tm_year = d / (100 * 100) - 1900
-            };
-            mktime(&base);
-            // weekday is base date's day of the week offset by (_NL_TIME_FIRST_WEEKDAY - 1)
-            #ifdef __linux__
-                CONFIG.weekday = (base.tm_wday + *nl_langinfo(_NL_TIME_FIRST_WEEKDAY) - 1) % 7;
-            #elif defined __MACH__
-                CFIndex first_day_of_week;
-                CFCalendarRef currentCalendar = CFCalendarCopyCurrent();
-                first_day_of_week = CFCalendarGetFirstWeekday(currentCalendar);
-                CFRelease(currentCalendar);
-                CONFIG.weekday = (base.tm_wday + first_day_of_week - 1) % 7;
-            #endif
-        #endif
-    }
-
-    // get the diary directory via argument, this takes precedence over env/config
-    if (argc < 2) {
-        if (CONFIG.dir == NULL) {
-            fprintf(stderr, "The diary directory must be provided as (non-option) arg, `--dir` arg,\n"
-                            "or in the DIARY_DIR environment variable, see `diary --help` or DIARY(1)\n");
-            return 1;
-        }
-    } else {
-        int option_char;
-        int option_index = 0;
-
-        // define options, see GETOPT(3)
-        static const struct option long_options[] = {
-            { "version",       no_argument,       0, 'v' },
-            { "help",          no_argument,       0, 'h' },
-            { "dir",           required_argument, 0, 'd' },
-            { "editor",        required_argument, 0, 'e' },
-            { "fmt",           required_argument, 0, 'f' },
-            { "range",         required_argument, 0, 'r' },
-            { "weekday",       required_argument, 0, 'w' },
-            { 0,               0,                 0,  0  }
-        };
-
-        // read option characters
-        while (1) {
-            option_char = getopt_long(argc, argv, "vhd:r:w:f:e:", long_options, &option_index);
-
-            if (option_char == -1) {
-                break;
-            }
-
-            switch (option_char) {
-                case 'v':
-                    // show program version
-                    printf("v%s\n", DIARY_VERSION);
-                    return 0;
-                    break;
-                case 'h':
-                    // show help text
-                    // printf("see man(1) diary\n");
-                    usage();
-                    return 0;
-                    break;
-                case 'd':
-                    // set diary directory from option character
-                    CONFIG.dir = (char *) calloc(strlen(optarg) + 1, sizeof(char));
-                    strcpy(CONFIG.dir, optarg);
-                    break;
-                case 'r':
-                    // set year range from option character
-                    CONFIG.range = atoi(optarg);
-                    break;
-                case 'w':
-                    // set first week day from option character
-                    fprintf(stderr, "%i\n", atoi(optarg));
-                    CONFIG.weekday = atoi(optarg);
-                    break;
-                case 'f':
-                    // set date format from option character
-                    CONFIG.fmt = (char *) calloc(strlen(optarg) + 1, sizeof(char));
-                    strcpy(CONFIG.fmt, optarg);
-                    break;
-                case 'e':
-                    // set default editor from option character
-                    CONFIG.editor = (char *) calloc(strlen(optarg) + 1, sizeof(char));
-                    strcpy(CONFIG.editor, optarg);
-                    break;
-                default:
-                    printf("?? getopt returned character code 0%o ??\n", option_char);
-            }
-        }
-
-        if (optind < argc) {
-            // set diary directory from first non-option argv-element,
-            // required for backwarad compatibility with diary <= 0.4
-            CONFIG.dir = (char *) calloc(strlen(argv[optind]) + 1, sizeof(char));
-            strcpy(CONFIG.dir, argv[optind]);
-        }
-    }
-
-    // check if that directory exists
-    DIR* diary_dir_ptr = opendir(CONFIG.dir);
-    if (diary_dir_ptr) {
-        // directory exists, continue
-        closedir(diary_dir_ptr);
-    } else if (errno == ENOENT) {
-        fprintf(stderr, "The directory '%s' does not exist\n", CONFIG.dir);
-        return 2;
-    } else {
-        fprintf(stderr, "The directory '%s' could not be opened\n", CONFIG.dir);
-        return 1;
-    }
-
-    setup_cal_timeframe();
-
-    initscr();
-    raw();
-    curs_set(0);
-
-    WINDOW* header = newwin(1, COLS - CAL_WIDTH - ASIDE_WIDTH, 0, ASIDE_WIDTH + CAL_WIDTH);
-    wattron(header, A_BOLD);
-    update_date(header);
-    WINDOW* wdays = newwin(1, 3 * 7, 0, ASIDE_WIDTH);
-    draw_wdays(wdays);
-
-    WINDOW* aside = newpad((CONFIG.range * 2 + 1) * 12 * MAX_MONTH_HEIGHT, ASIDE_WIDTH);
-    WINDOW* cal = newpad((CONFIG.range * 2 + 1) * 12 * MAX_MONTH_HEIGHT, CAL_WIDTH);
-    keypad(cal, TRUE);
-    draw_calendar(cal, aside, CONFIG.dir, strlen(CONFIG.dir));
-
-    int ch, conf_ch;
-    int pad_pos = 0;
-    int syear = 0, smonth = 0, sday = 0;
-    struct tm new_date;
-    int prev_width = COLS - ASIDE_WIDTH - CAL_WIDTH;
-    int prev_height = LINES - 1;
-    size_t diary_dir_size = strlen(CONFIG.dir);
-
-    bool mv_valid = go_to(cal, aside, raw_time, &pad_pos);
-    // mark current day
-    atrs = winch(cal) & A_ATTRIBUTES;
-    wchgat(cal, 2, atrs | A_UNDERLINE, 0, NULL);
-    prefresh(cal, pad_pos, 0, 1, ASIDE_WIDTH, LINES - 1, ASIDE_WIDTH + CAL_WIDTH);
-
-    WINDOW* prev = newwin(prev_height, prev_width, 1, ASIDE_WIDTH + CAL_WIDTH);
-    display_entry(CONFIG.dir, diary_dir_size, &today, prev, prev_width);
-
-
-    do {
-        ch = wgetch(cal);
-        // new_date represents the desired date the user wants to go_to(),
-        // which may not be a feasible date at all
-        new_date = curs_date;
-        char ecmd[150];
-        char* pecmd = ecmd;
-        char pth[100];
-        char* ppth = pth;
-        char dstr[16];
-        edit_cmd(CONFIG.dir, diary_dir_size, &new_date, &pecmd, sizeof ecmd);
-
-        switch(ch) {
-            // basic movements
-            case 'j':
-            case KEY_DOWN:
-                new_date.tm_mday += 7;
-                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
-                break;
-            case 'k':
-            case KEY_UP:
-                new_date.tm_mday -= 7;
-                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
-                break;
-            case 'l':
-            case KEY_RIGHT:
-                new_date.tm_mday++;
-                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
-                break;
-            case 'h':
-            case KEY_LEFT:
-                new_date.tm_mday--;
-                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
-                break;
-
-            // jump to top/bottom of page
-            case 'g':
-                new_date = find_closest_entry(cal_start, false, CONFIG.dir, diary_dir_size);
-                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
-                break;
-            case 'G':
-                new_date = find_closest_entry(cal_end, true, CONFIG.dir, diary_dir_size);
-                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
-                break;
-
-            // jump backward/forward by a month
-            case 'K':
-                if (new_date.tm_mday == 1)
-                    new_date.tm_mon--;
-                new_date.tm_mday = 1;
-                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
-                break;
-            case 'J':
-                new_date.tm_mon++;
-                new_date.tm_mday = 1;
-                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
-                break;
-
-            // search for specific date
-            case 's':
-                wclear(header);
-                curs_set(2);
-                mvwprintw(header, 0, 0, "Go to date [YYYY-MM-DD]: ");
-                if (wscanw(header, "%4i-%2i-%2i", &syear, &smonth, &sday) == 3) {
-                    // struct tm.tm_year: years since 1900
-                    new_date.tm_year = syear - 1900;
-                    // struct tm.tm_mon in range [0, 11]
-                    new_date.tm_mon = smonth - 1;
-                    new_date.tm_mday = sday;
-                    mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
-                }
-                curs_set(0);
-                //update_date(header);
-                break;
-            // today shortcut
-            case 't':
-                new_date = today;
-                mv_valid = go_to(cal, aside, raw_time, &pad_pos);
-                break;
-            // delete entry
-            case 'd':
-            case 'x':
-                if (date_has_entry(CONFIG.dir, diary_dir_size, &curs_date)) {
-                    // get file path of entry and delete entry
-                    fpath(CONFIG.dir, diary_dir_size, &curs_date, &ppth, sizeof pth);
-                    if (ppth == NULL) {
-                        fprintf(stderr, "Error retrieving file path for entry removal");
-                        break;
-                    }
-
-                    // prepare header for confirmation dialogue
-                    wclear(header);
-                    curs_set(2);
-                    noecho();
-
-                    // ask for confirmation
-                    get_date_str(&curs_date, dstr, sizeof dstr);
-                    mvwprintw(header, 0, 0, "Delete entry '%s'? [Y/n] ", dstr);
-                    bool conf = false;
-                    while (!conf) {
-                        conf_ch = wgetch(header);
-                        if (conf_ch == 'y' || conf_ch == 'Y' || conf_ch == '\n') {
-                            if (unlink(pth) != -1) {
-                                // file successfully deleted, remove entry highlight
-                                atrs = winch(cal) & A_ATTRIBUTES;
-                                wchgat(cal, 2, atrs & ~A_BOLD, 0, NULL);
-                                prefresh(cal, pad_pos, 0, 1, ASIDE_WIDTH,
-                                         LINES - 1, ASIDE_WIDTH + CAL_WIDTH);
-                            }
-                        } else if (conf_ch == 27 || conf_ch == 'n') {
-                            update_date(header);
-                        }
-                        break;
-                    }
-
-                    echo();
-                    curs_set(0);
-                }
-                break;
-            // edit/create a diary entry
-            case 'e':
-            case '\n':
-                if (pecmd == NULL) {
-                    fprintf(stderr, "Error retrieving edit command");
-                    break;
-                }
-                curs_set(1);
-                system(ecmd);
-                curs_set(0);
-                keypad(cal, TRUE);
-
-                // mark newly created entry
-                if (date_has_entry(CONFIG.dir, diary_dir_size, &curs_date)) {
-                    atrs = winch(cal) & A_ATTRIBUTES;
-                    wchgat(cal, 2, atrs | A_BOLD, 0, NULL);
-
-                    // refresh the calendar to add highlighting
-                    prefresh(cal, pad_pos, 0, 1, ASIDE_WIDTH,
-                             LINES - 1, ASIDE_WIDTH + CAL_WIDTH);
-                }
-                break;
-            // Move to the previous diary entry
-            case 'N':
-                new_date = find_closest_entry(new_date, true, CONFIG.dir, diary_dir_size);
-                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
-                break;
-            // Move to the next diary entry
-            case 'n':
-                new_date = find_closest_entry(new_date, false, CONFIG.dir, diary_dir_size);
-                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
-                break;
-        }
-
-        if (mv_valid) {
-            update_date(header);
-
-            // adjust prev width (if terminal was resized in the mean time)
-            prev_width = COLS - ASIDE_WIDTH - CAL_WIDTH;
-            wresize(prev, prev_height, prev_width);
-
-            // read the diary
-            display_entry(CONFIG.dir, diary_dir_size, &curs_date, prev, prev_width);
-        }
-    } while (ch != 'q');
-
-    endwin();
-    system("clear");
-    return 0;
-}
diff --git a/diary.cfg b/diary.cfg
@@ -1,10 +0,0 @@
-# Path that holds the journal text files
-#dir = ~/diary
-# Number of years to show before/after todays date
-range = 1
-# 0 = Sunday, 1 = Monday, ..., 6 = Saturday
-weekday = 1
-# Date and file format, change with care
-fmt = %Y-%m-%d
-# Editor to open journal files with
-editor = ""
-\ No newline at end of file
diff --git a/diary.h b/diary.h
@@ -1,65 +0,0 @@
-#ifndef DIARY
-#define DIARY
-
-
-#ifdef __MACH__
-	#include <CoreFoundation/CoreFoundation.h>
-#endif
-#include <stdio.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <wordexp.h>
-#include <unistd.h>
-#include <getopt.h>
-#include <string.h>
-#include <time.h>
-#include <errno.h>
-#include <dirent.h>
-#include <ncurses.h>
-#include <locale.h>
-#include <langinfo.h>
-
-#define XDG_CONFIG_HOME_FALLBACK "~/.config"
-#define CONFIG_FILE_PATH "diary/diary.cfg"
-#define DIARY_VERSION "0.6-unstable"
-#define CAL_WIDTH 21
-#define ASIDE_WIDTH 4
-#define MAX_MONTH_HEIGHT 6
-
-static const char* WEEKDAYS[] = {"Su","Mo","Tu","We","Th","Fr","Sa"};
-
-void setup_cal_timeframe();
-void draw_wdays(WINDOW* head);
-void draw_calendar(WINDOW* number_pad, WINDOW* month_pad, const char* diary_dir, size_t diary_dir_size);
-void update_date(WINDOW* header);
-
-bool go_to(WINDOW* calendar, WINDOW* aside, time_t date, int* cur_pad_pos);
-void display_entry(const char* dir, size_t dir_size, const struct tm* date, WINDOW* win, int width);
-void edit_cmd(const char* dir, size_t dir_size, const struct tm* date, char** rcmd, size_t rcmd_size);
-
-bool date_has_entry(const char* dir, size_t dir_size, const struct tm* i);
-void get_date_str(const struct tm* date, char* date_str, size_t date_str_size);
-void fpath(const char* dir, size_t dir_size, const struct tm* date, char** rpath, size_t rpath_size);
-
-typedef struct
-{
-    // Path that holds the journal text files
-    char* dir;
-    // Number of years to show before/after todays date
-    int range;
-    // 7 = Sunday, 1 = Monday, ..., 6 = Saturday
-    int weekday;
-    // 2020-12-31
-    char* fmt;
-    // Editor to open journal files with
-    char* editor;
-} config;
-
-config CONFIG = {
-    .range = 1,
-    .weekday = 1,
-    .fmt = "%Y-%m-%d",
-    .editor = ""
-};
-
-#endif
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diff --git a/img/diary-worm.png b/img/diary-worm.png
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diff --git a/man/diary.1 b/man/diary.1
@@ -0,0 +1,203 @@
+.TH DIARY 1
+.SH NAME
+diary \- Text-based journaling program
+
+.SH SYNOPSIS
+.B diary
+[\fIOPTION\fR]... [\fIDIRECTORY\fR]...
+.br
+
+.SH DESCRIPTION
+.B diary
+is a text-based program for managing journal entries.
+
+.SH OPTIONS
+.TP
+\fB\-v\fR, \fB\-\-version\fR
+Print diary version
+.TP
+\fB\-h\fR, \fB\-\-help\fR
+Show diary help text
+.TP
+\fB\-d\fR, \fB\-\-dir\fR=\fI\,DIARY_DIR\/\fR
+Diary storage directory DIARY_DIR
+.TP
+\fB\-e\fR, \fB\-\-editor\fR=\fI\,EDITOR\/\fR
+EDITOR is the text editor used for opening the journal files.
+.TP
+\fB\-f\fR, \fB\-\-fmt\fR=\fI\,FMT\/\fR
+FMT is a custom date and file format. Change with care, because the diary
+reads and writes to files with file name FMT. The new FMT is only
+applied to newly saved entries. Existing entries with the old FMT are not
+automatically migrated to the new FMT and do not show up with a new FMT
+specifier. Consequently, a change in FMT shows an empty diary at first.
+Rename all files in the DIARY_DIR to migrate to a new FMT.
+.TP
+\fB\-r\fR, \fB\-\-range\fR=\fI\,RANGE\/\fR
+RANGE is the number of years to show before/after todays date. Defaults to 1 year.
+.TP
+\fB\-f\fR, \fB\-\-weekday\fR=\fI\,DAY\/\fR
+First day of the week. DAY is an integer in range (0..6), interpreted as 0 or 7 = Sun,
+1 = Mon, ..., 6 = Sat. If glibc is installed, the first day of the week is derived
+from the current locale setting ('$LANG', see man locale). Without glibc, the
+first weekday defaults to 1 (Monday), unless specified otherwise with this option.
+
+.SH NAVIGATION
+Navigation is done using the following vim-inspired keyboard shortcuts:
+
+.TS
+tab(|);
+l l.
+Key(s)    | Action
+======    | ======
+e, Enter  | edit current entry
+d, x      | delete current entry
+s         | sync current entry with CalDAV server
+
+t         | jump to today
+f         | jump to or find specific day
+
+j, down   | go forward by 1 week
+k, up     | go backward by 1 week
+h, left   | go left by 1 day
+l, right  | go right by 1 day
+J         | go forward by 1 month
+K         | go backward by 1 month
+
+N         | go to the previous journal entry
+n         | go to the next journal entry
+g         | go to start of journal
+G         | go to end of journal
+
+q         | quit the program
+.TE
+
+.SH ENVIRONMENT
+
+.IP DIARY_DIR
+If this variable is set to a directory that can be opened,
+.B diary
+will use it to store diary files. Diary files are simple text files named
+after their date, formatted according to FMT (see '-f'/'--fmt' options and
+'fmt' config key). The format defaults to "%Y-%m-%d", which is "YYYY-MM-DD"
+(see man strftime). All other files different from FMT are ignored.
+
+.IP EDITOR
+The program used to edit journal entries.
+
+.IP LANG
+The default locale used to display the first day of the week.
+
+.SH ARGUMENTS
+
+If the argument \fIDIRECTORY\fR is given, diary files are read from and
+stored to that directory, ignoring the DIARY_DIR environment variable,
+any '-d'/'--dir' options or the 'dir' value set in the config file.
+
+.SH FILES
+.TP
+.I ${PREFIX:-/usr/local/bin}/diary
+The diary binary
+.TP
+.I ${XDG_CONFIG_HOME:-~/.config}/diary/diary.cfg
+An optional diary configuration file
+
+.SH CONFIGURATION FILE
+The diary.cfg configuration file can optionally be used to persist diary
+configuration. Use the '#' or ';' characters to comment lines.
+
+Create default config location:
+
+.nf
+    mkdir -p ${XDG_CONFIG_HOME:-~/.config}/diary
+.fi
+
+Install an example config file with defaults:
+
+.in 0
+.nf
+tee ${XDG_CONFIG_HOME:-~/.config}/diary/diary.cfg <<EOF
+# Path that holds the journal text files
+#dir = ~/diary
+# Number of years to show before/after todays date
+range = 1
+# 0 = Sunday, 1 = Monday, ..., 6 = Saturday
+weekday = 1
+# Date and file format, change with care
+fmt = %Y-%m-%d
+# Editor to open journal files with
+editor =
+# Google calendar name for CalDAV sync
+#google_calendar =
+# Google OAuth2 clientid and secretid
+#google_clientid =
+#google_secretid =
+# Google OAuth2 tokenfile
+#google_tokenfile = ~/.diary-token
+EOF
+.fi
+
+.SH PRECEDENCE RULES
+
+The default variables, for instance, for the configuration variables 'editor', 'dir' and 'weekday', are populated with values in the following order:
+
+.TP
+1.
+No default for 'DIARY_DIR'. Defaults for 'range', 'weekday', 'fmt' and 'editor' are provided in 'diary.h'. If 'EDITOR' is unset and no editor is provided in the config file or via the '-e' option, the
+.B
+diary
+works read-only. Journal files cannot be opened. If 'DIARY_DIR' is not provided, the
+.B
+diary
+won't open.
+.TP
+2.
+.B
+Config file
+(empty default for 'editor', no default for 'dir')
+.TP
+3.
+.B
+Environment
+variables '$DIARY_DIR', '$EDITOR' and '$LANG' for locale ('weekday')
+.TP
+4.
+.B
+Option
+arguments, see section
+.B
+OPTIONS
+.TP
+5.
+First non-option argument \fIDIRECTORY\fR is interpreted as 'DIARY_DIR'
+
+.SH PRECEDENCE EXAMPLE: LOCALE AND FIRST DAY OF WEEK
+If glibc is installed, the first weekday defaults to the locale defined in the current shell
+environment ($LANG, see man locale), unless specified otherwise via the '--weekday'/'-w'.
+
+.nf
+# start with weekday=3(Wed), overrule any other configuration value
+diary -w3
+
+# start with glibc derived weekday=1, regardless of 'weekday' in config file
+LANG=de_CH diary
+
+# if glibc is installed, start with glibc derived base date (weekday=0)
+LANG= diary
+
+# disable environment variable, default to value from config file
+unset LANG
+
+# start with 'weekday' default from config file, if available
+diary
+
+# remove config file
+rm ${XDG_CONFIG_HOME:-~/.config}/diary/diary.cfg
+
+# start with 'weekday' default value from source code (1=Mon)
+diary
+.fi
+
+.SH DEVELOPMENT
+All source code is available in this github repository:
+<https://github.com/in0rdr/diary>. Contributions are always welcome!
diff --git a/man/diary.1.html b/man/diary.1.html
@@ -0,0 +1,319 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8"/>
+  <style>
+    table.head, table.foot { width: 100%; }
+    td.head-rtitle, td.foot-os { text-align: right; }
+    td.head-vol { text-align: center; }
+    div.Pp { margin: 1ex 0ex; }
+    div.Nd, div.Bf, div.Op { display: inline; }
+    span.Pa, span.Ad { font-style: italic; }
+    span.Ms { font-weight: bold; }
+    dl.Bl-diag > dt { font-weight: bold; }
+    code.Nm, code.Fl, code.Cm, code.Ic, code.In, code.Fd, code.Fn,
+    code.Cd { font-weight: bold; font-family: inherit; }
+  </style>
+  <title>DIARY(1)</title>
+</head>
+<body>
+<table class="head">
+  <tr>
+    <td class="head-ltitle">DIARY(1)</td>
+    <td class="head-vol">General Commands Manual</td>
+    <td class="head-rtitle">DIARY(1)</td>
+  </tr>
+</table>
+<div class="manual-text">
+<h1 class="Sh" title="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
+diary - Text-based journaling program
+<div class="Pp"></div>
+<h1 class="Sh" title="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<b>diary</b> [ <i>OPTION</i>]... [<i>DIRECTORY</i>]...
+<div>&#x00A0;</div>
+<div class="Pp"></div>
+<h1 class="Sh" title="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<b>diary</b> is a text-based program for managing journal entries.
+<div class="Pp"></div>
+<h1 class="Sh" title="Sh" id="OPTIONS"><a class="permalink" href="#OPTIONS">OPTIONS</a></h1>
+<dl class="Bl-tag">
+  <dt><b>-v</b>, <b>--version</b></dt>
+  <dd>Print diary version</dd>
+</dl>
+<dl class="Bl-tag">
+  <dt><b>-h</b>, <b>--help</b></dt>
+  <dd>Show diary help text</dd>
+</dl>
+<dl class="Bl-tag">
+  <dt><b>-d</b>, <b>--dir</b>=<i>DIARY_DIR</i></dt>
+  <dd>Diary storage directory DIARY_DIR</dd>
+</dl>
+<dl class="Bl-tag">
+  <dt><b>-e</b>, <b>--editor</b>=<i>EDITOR</i></dt>
+  <dd>EDITOR is the text editor used for opening the journal files.</dd>
+</dl>
+<dl class="Bl-tag">
+  <dt><b>-f</b>, <b>--fmt</b>=<i>FMT</i></dt>
+  <dd>FMT is a custom date and file format. Change with care, because the diary
+      reads and writes to files with file name FMT. The new FMT is only applied
+      to newly saved entries. Existing entries with the old FMT are not
+      automatically migrated to the new FMT and do not show up with a new FMT
+      specifier. Consequently, a change in FMT shows an empty diary at first.
+      Rename all files in the DIARY_DIR to migrate to a new FMT.</dd>
+</dl>
+<dl class="Bl-tag">
+  <dt><b>-r</b>, <b>--range</b>=<i>RANGE</i></dt>
+  <dd>RANGE is the number of years to show before/after todays date. Defaults to
+      1 year.</dd>
+</dl>
+<dl class="Bl-tag">
+  <dt><b>-f</b>, <b>--weekday</b>=<i>DAY</i></dt>
+  <dd>First day of the week. DAY is an integer in range (0..6), interpreted as 0
+      or 7 = Sun, 1 = Mon, ..., 6 = Sat. If glibc is installed, the first day of
+      the week is derived from the current locale setting ('$LANG', see man
+      locale). Without glibc, the first weekday defaults to 1 (Monday), unless
+      specified otherwise with this option.
+    <div class="Pp"></div>
+  </dd>
+</dl>
+<h1 class="Sh" title="Sh" id="NAVIGATION"><a class="permalink" href="#NAVIGATION">NAVIGATION</a></h1>
+Navigation is done using the following vim-inspired keyboard shortcuts:
+<div class="Pp"></div>
+<table class="tbl">
+  <tr>
+    <td>Key(s) </td>
+    <td> Action</td>
+  </tr>
+  <tr>
+    <td>====== </td>
+    <td> ======</td>
+  </tr>
+  <tr>
+    <td>e, Enter </td>
+    <td> edit current entry</td>
+  </tr>
+  <tr>
+    <td>d, x </td>
+    <td> delete current entry</td>
+  </tr>
+  <tr>
+    <td>s </td>
+    <td> sync current entry with CalDAV server</td>
+  </tr>
+  <tr>
+    <td></td>
+    <td></td>
+  </tr>
+  <tr>
+    <td>t </td>
+    <td> jump to today</td>
+  </tr>
+  <tr>
+    <td>f </td>
+    <td> jump to or find specific day</td>
+  </tr>
+  <tr>
+    <td></td>
+    <td></td>
+  </tr>
+  <tr>
+    <td>j, down </td>
+    <td> go forward by 1 week</td>
+  </tr>
+  <tr>
+    <td>k, up </td>
+    <td> go backward by 1 week</td>
+  </tr>
+  <tr>
+    <td>h, left </td>
+    <td> go left by 1 day</td>
+  </tr>
+  <tr>
+    <td>l, right </td>
+    <td> go right by 1 day</td>
+  </tr>
+  <tr>
+    <td>J </td>
+    <td> go forward by 1 month</td>
+  </tr>
+  <tr>
+    <td>K </td>
+    <td> go backward by 1 month</td>
+  </tr>
+  <tr>
+    <td></td>
+    <td></td>
+  </tr>
+  <tr>
+    <td>N </td>
+    <td> go to the previous journal entry</td>
+  </tr>
+  <tr>
+    <td>n </td>
+    <td> go to the next journal entry</td>
+  </tr>
+  <tr>
+    <td>g </td>
+    <td> go to the first journal entry</td>
+  </tr>
+  <tr>
+    <td>G </td>
+    <td> go to the last journal entry</td>
+  </tr>
+  <tr>
+    <td></td>
+    <td></td>
+  </tr>
+  <tr>
+    <td>q </td>
+    <td> quit the program</td>
+  </tr>
+</table>
+<div class="Pp"></div>
+<h1 class="Sh" title="Sh" id="ENVIRONMENT"><a class="permalink" href="#ENVIRONMENT">ENVIRONMENT</a></h1>
+<dl class="Bl-tag">
+  <dt>DIARY_DIR</dt>
+  <dd>If this variable is set to a directory that can be opened, <b>diary</b>
+      will use it to store diary files. Diary files are simple text files named
+      after their date, formatted according to FMT (see '-f'/'--fmt' options and
+      (see man strftime). All other files different from FMT are ignored.
+    <div class="Pp"></div>
+  </dd>
+</dl>
+<dl class="Bl-tag">
+  <dt>EDITOR</dt>
+  <dd>The program used to edit journal entries.
+    <div class="Pp"></div>
+  </dd>
+</dl>
+<dl class="Bl-tag">
+  <dt>LANG</dt>
+  <dd>The default locale used to display the first day of the week.
+    <div class="Pp"></div>
+  </dd>
+</dl>
+<h1 class="Sh" title="Sh" id="ARGUMENTS"><a class="permalink" href="#ARGUMENTS">ARGUMENTS</a></h1>
+If the argument <i>DIRECTORY</i> is given, diary files are read from and stored
+  to that directory, ignoring the DIARY_DIR environment variable, any
+  '-d'/'--dir' options or the 'dir' value set in the config file.
+<div class="Pp"></div>
+<h1 class="Sh" title="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
+<dl class="Bl-tag">
+  <dt><i>${PREFIX:-/usr/local/bin}/diary</i></dt>
+  <dd>The diary binary</dd>
+</dl>
+<dl class="Bl-tag">
+  <dt><i>${XDG_CONFIG_HOME:-~/.config}/diary/diary.cfg</i></dt>
+  <dd>An optional diary configuration file
+    <div class="Pp"></div>
+  </dd>
+</dl>
+<h1 class="Sh" title="Sh" id="CONFIGURATION_FILE"><a class="permalink" href="#CONFIGURATION_FILE">CONFIGURATION
+  FILE</a></h1>
+The diary.cfg configuration file can optionally be used to persist diary
+  configuration. Use the '#' or ';' characters to comment lines.
+<div class="Pp"></div>
+Create default config location:
+<div class="Pp"></div>
+<pre>
+    mkdir -p ${XDG_CONFIG_HOME:-~/.config}/diary
+</pre>
+<div class="Pp"></div>
+Install an example config file with defaults:
+<div class="Pp"></div>
+<br/>
+<pre>
+tee ${XDG_CONFIG_HOME:-~/.config}/diary/diary.cfg &lt;&lt;EOF
+# Path that holds the journal text files
+#dir = ~/diary
+# Number of years to show before/after todays date
+range = 1
+# 0 = Sunday, 1 = Monday, ..., 6 = Saturday
+weekday = 1
+# Date and file format, change with care
+fmt = %Y-%m-%d
+# Editor to open journal files with
+editor =
+# Google calendar name for CalDAV sync
+#google_calendar =
+# Google OAuth2 clientid and secretid
+#google_clientid =
+#google_secretid =
+# Google OAuth2 tokenfile
+#google_tokenfile = ~/.diary-token
+EOF
+</pre>
+<div class="Pp"></div>
+<h1 class="Sh" title="Sh" id="PRECEDENCE_RULES"><a class="permalink" href="#PRECEDENCE_RULES">PRECEDENCE
+  RULES</a></h1>
+The default variables, for instance, for the configuration variables 'editor',
+  'dir' and 'weekday', are populated with values in the following order:
+<div class="Pp"></div>
+<dl class="Bl-tag">
+  <dt>1.</dt>
+  <dd>No default for 'DIARY_DIR'. Defaults for 'range', 'weekday', 'fmt' and
+      'editor' are provided in 'diary.h'. If 'EDITOR' is unset and no editor is
+      provided in the config file or via the '-e' option, the <b>diary</b> works
+      read-only. Journal files cannot be opened. If 'DIARY_DIR' is not provided,
+      the <b>diary</b> won't open.</dd>
+</dl>
+<dl class="Bl-tag">
+  <dt>2.</dt>
+  <dd><b>Config file</b> (empty default for 'editor', no default for 'dir')</dd>
+</dl>
+<dl class="Bl-tag">
+  <dt>3.</dt>
+  <dd><b>Environment</b> variables '$DIARY_DIR', '$EDITOR' and '$LANG' for
+      locale ('weekday')</dd>
+</dl>
+<dl class="Bl-tag">
+  <dt>4.</dt>
+  <dd><b>Option</b> arguments, see section <b>OPTIONS</b></dd>
+</dl>
+<dl class="Bl-tag">
+  <dt>5.</dt>
+  <dd>First non-option argument <i>DIRECTORY</i> is interpreted as 'DIARY_DIR'
+    <div class="Pp"></div>
+  </dd>
+</dl>
+<h1 class="Sh" title="Sh" id="PRECEDENCE_EXAMPLE:_LOCALE_AND_FIRST_DAY_OF_WEEK"><a class="permalink" href="#PRECEDENCE_EXAMPLE:_LOCALE_AND_FIRST_DAY_OF_WEEK">PRECEDENCE
+  EXAMPLE: LOCALE AND FIRST DAY OF WEEK</a></h1>
+If glibc is installed, the first weekday defaults to the locale defined in the
+  current shell environment ($LANG, see man locale), unless specified otherwise
+  via the '--weekday'/'-w'.
+<div class="Pp"></div>
+<pre>
+# start with weekday=3(Wed), overrule any other configuration value
+diary -w3
+<div class="Pp"></div>
+# start with glibc derived weekday=1, regardless of 'weekday' in config file
+LANG=de_CH diary
+<div class="Pp"></div>
+# if glibc is installed, start with glibc derived base date (weekday=0)
+LANG= diary
+<div class="Pp"></div>
+# disable environment variable, default to value from config file
+unset LANG
+<div class="Pp"></div>
+# start with 'weekday' default from config file, if available
+diary
+<div class="Pp"></div>
+# remove config file
+rm ${XDG_CONFIG_HOME:-~/.config}/diary/diary.cfg
+<div class="Pp"></div>
+# start with 'weekday' default value from source code (1=Mon)
+diary
+</pre>
+<div class="Pp"></div>
+<h1 class="Sh" title="Sh" id="DEVELOPMENT"><a class="permalink" href="#DEVELOPMENT">DEVELOPMENT</a></h1>
+All source code is available in this github repository:
+  &lt;https://github.com/in0rdr/diary&gt;. Contributions are always
+  welcome!</div>
+<table class="foot">
+  <tr>
+    <td class="foot-date"></td>
+    <td class="foot-os"></td>
+  </tr>
+</table>
+</body>
+</html>
diff --git a/src/caldav.c b/src/caldav.c
@@ -0,0 +1,877 @@
+#include "caldav.h"
+
+CURL *curl;
+char* access_token;
+char* refresh_token;
+int token_ttl;
+
+// Local bind address for receiving OAuth callbacks.
+// Reserve 2 chars for the ipv6 square brackets.
+char ip[INET6_ADDRSTRLEN], ipstr[INET6_ADDRSTRLEN+2];
+
+/* Write a random code challenge of size len to dest */
+void random_code_challenge(size_t len, char* dest) {
+    // https://developers.google.com/identity/protocols/oauth2/native-app#create-code-challenge
+    // A code_verifier is a random string using characters [A-Z] / [a-z] / [0-9] / "-" / "." / "_" / "~"
+    srand(time(NULL));
+
+    char alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~";
+    size_t alphabet_size = strlen(alphabet);
+
+    for (int i = 0; i < len; i++) {
+        dest[i] = alphabet[rand() % alphabet_size];
+    }
+    dest[len-1] = '\0';
+}
+
+static size_t curl_write_mem_callback(void * contents, size_t size, size_t nmemb, void *userp) {
+    size_t realsize = size * nmemb;
+    struct curl_mem_chunk* mem = (struct curl_mem_chunk*)userp;
+
+    char* ptr = realloc(mem->memory, mem->size + realsize + 1);
+    if (!ptr) {
+        fprintf(stderr, "not enough memory (realloc in CURLOPT_WRITEFUNCTION returned NULL)\n");
+        return 0;
+    }
+
+    mem->memory = ptr;
+    memcpy(&(mem->memory[mem->size]), contents, realsize);
+    mem->size += realsize;
+    mem->memory[mem->size] = 0;
+
+    return realsize;
+}
+
+static size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream) {
+    size_t written = fwrite(ptr, size, nmemb, (FILE *)stream);
+    return written;
+}
+
+// todo
+// https://beej.us/guide/bgnet/html
+void* get_in_addr(struct sockaddr *sa) {
+    if (sa->sa_family == AF_INET) {
+        return &(((struct sockaddr_in*)sa)->sin_addr);
+    }
+
+    return &(((struct sockaddr_in6*)sa)->sin6_addr);
+}
+
+/*
+* Extract OAuth2 code from http header. Reads the code from
+* the http header in http_header and writes the OAuth2 code
+* to the char string pointed to by code.
+*/
+char* extract_oauth_code(char* http_header) {
+    // example token: "/?code=&scope="
+    char* res = strtok(http_header, " ");
+    while (res != NULL) {
+        if (strstr(res, "code") != NULL) {
+            res = strtok(res, "="); // code key
+            res = strtok(NULL, "&"); // code value
+            fprintf(stderr, "Code: %s\n", res);
+            break;
+        }
+        res = strtok(NULL, " ");
+    }
+    return res;
+}
+
+char* read_tokenfile() {
+    FILE* token_file;
+    char* token_buf;
+    long token_bytes;
+
+    char* tokenfile_path = expand_path(CONFIG.google_tokenfile);
+    token_file = fopen(tokenfile_path, "r");
+    free(tokenfile_path);
+
+    if (token_file == NULL) {
+        perror("Failed to open tokenfile");
+        return NULL;
+    }
+
+    fseek(token_file, 0, SEEK_END);
+    token_bytes = ftell(token_file) + 1;
+    rewind(token_file);
+
+    token_buf = malloc(token_bytes);
+    if (token_buf != NULL) {
+        fread(token_buf, sizeof(char), token_bytes, token_file);
+        token_buf[token_bytes] = '\0';
+
+        access_token = extract_json_value(token_buf, "access_token", true);
+
+        // program segfaults if NULL value is provided to atoi
+        char* token_ttl_str = extract_json_value(token_buf, "expires_in", false);
+        if (token_ttl_str == NULL) {
+            token_ttl = 0;
+        } else {
+            token_ttl = atoi(token_ttl_str);
+        }
+
+        // only update the existing refresh token if the request actually
+        // contained a valid refresh_token, i.e, if it was the initial
+        // interactive authZ request from token code confirmed by the user
+        char* new_refresh_token = extract_json_value(token_buf, "refresh_token", true);
+        if (new_refresh_token != NULL) {
+            refresh_token = new_refresh_token;
+        }
+
+        fprintf(stderr, "Access token: %s\n", access_token);
+        fprintf(stderr, "Token TTL: %i\n", token_ttl);
+        fprintf(stderr, "Refresh token: %s\n", refresh_token);
+    } else {
+        perror("malloc failed");
+        return NULL;
+    }
+    fclose(token_file);
+    return token_buf;
+}
+
+void write_tokenfile() {
+    char* tokenfile_path = expand_path(CONFIG.google_tokenfile);
+    FILE* tokenfile = fopen(tokenfile_path, "wb");
+    free(tokenfile_path);
+
+    if (tokenfile == NULL) {
+        perror("Failed to open tokenfile");
+    } else {
+        char contents[1000];
+        char* tokenfile_contents = "{\n"
+        "  \"access_token\": \"%s\",\n"
+        "  \"expires_in\": %i,\n"
+        "  \"refresh_token\": \"%s\"\n"
+        "}\n";
+        sprintf(contents, tokenfile_contents,
+                access_token,
+                token_ttl,
+                refresh_token);
+        fputs(contents, tokenfile);
+    }
+    fclose(tokenfile);
+
+    chmod(tokenfile_path, S_IRUSR|S_IWUSR);
+    perror("chmod");
+
+
+    char* tokfile = read_tokenfile();
+    fprintf(stderr, "New tokenfile contents: %s\n", tokfile);
+    fprintf(stderr, "New Access token: %s\n", access_token);
+    fprintf(stderr, "New Token TTL: %i\n", token_ttl);
+    fprintf(stderr, "Refresh token: %s\n", refresh_token);
+    free(tokfile);
+}
+
+void get_access_token(char* code, char* verifier, bool refresh) {
+    CURLcode res;
+    char* tokfile;
+
+    char postfields[500];
+    if (refresh) {
+        sprintf(postfields, "client_id=%s&client_secret=%s&grant_type=refresh_token&refresh_token=%s",
+                CONFIG.google_clientid,
+                CONFIG.google_secretid,
+                refresh_token);
+    } else {
+        sprintf(postfields, "client_id=%s&client_secret=%s&code=%s&code_verifier=%s&grant_type=authorization_code&redirect_uri=http://%s:%i",
+                CONFIG.google_clientid,
+                CONFIG.google_secretid,
+                code,
+                verifier,
+                ipstr,
+                GOOGLE_OAUTH_REDIRECT_PORT);
+    }
+    fprintf(stderr, "CURLOPT_POSTFIELDS: %s\n", postfields);
+
+    curl = curl_easy_init();
+
+    FILE* tokenfile;
+    char* tokenfile_path;
+
+    if (curl) {
+        curl_easy_setopt(curl, CURLOPT_URL, GOOGLE_OAUTH_TOKEN_URL);
+        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postfields);
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+        //curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
+
+        tokenfile_path = expand_path(CONFIG.google_tokenfile);
+        tokenfile = fopen(tokenfile_path, "wb");
+        free(tokenfile_path);
+
+        if (tokenfile == NULL) {
+            perror("Failed to open tokenfile");
+        } else {
+            curl_easy_setopt(curl, CURLOPT_WRITEDATA, tokenfile);
+            res = curl_easy_perform(curl);
+            fclose(tokenfile);
+        }
+
+        curl_easy_cleanup(curl);
+
+        if (res != CURLE_OK) {
+            fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
+            return;
+        }
+        // update global variables from tokenfile
+        // this will also init the access_token var the first time
+        tokfile = read_tokenfile();
+        free(tokfile);
+        // Make sure the refresh token is re-written and persistet
+        // to the tokenfile for further requests, because the
+        // is not returned by the refresh_token call:
+        // https://developers.google.com/identity/protocols/oauth2/native-app#offline
+        write_tokenfile();
+    }
+}
+
+char* get_oauth_code(const char* verifier, WINDOW* header) {
+    struct addrinfo hints, *addr_res;
+
+    memset(&hints, 0, sizeof(struct addrinfo));
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = SOCK_STREAM;
+
+    int status;
+    if ((status=getaddrinfo(NULL, MKSTR(GOOGLE_OAUTH_REDIRECT_PORT), &hints, &addr_res)) != 0) {
+        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(status));
+    }
+
+    void *addr;
+    char *ipver;
+    //todo: extract
+    //addr = get_in_addr(addr_res->ai_addr);
+    if (addr_res->ai_family == AF_INET) {
+        struct sockaddr_in *ipv4 = (struct sockaddr_in *) addr_res->ai_addr;
+        addr = &(ipv4->sin_addr);
+        ipver = "IPv4";
+    } else { // IPv6
+        struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *) addr_res->ai_addr;
+        addr = &(ipv6->sin6_addr);
+        ipver = "IPv6";
+    }
+
+    inet_ntop(addr_res->ai_family, addr, ip, sizeof ip);
+    if (strcmp("IPv6", ipver) == 0) {
+        sprintf(ipstr, "[%s]", ip);
+    }
+
+    // Show Google OAuth URI
+    char uri[500];
+    sprintf(uri, "%s?scope=%s&code_challenge=%s&response_type=%s&redirect_uri=http://%s:%i&client_id=%s",
+            GOOGLE_OAUTH_AUTHZ_URL,
+            GOOGLE_OAUTH_SCOPE,
+            verifier,
+            GOOGLE_OAUTH_RESPONSE_TYPE,
+            ipstr,
+            GOOGLE_OAUTH_REDIRECT_PORT,
+            CONFIG.google_clientid);
+    fprintf(stderr, "Google OAuth2 authorization URI: %s\n", uri);
+
+    // Show the Google OAuth2 authorization URI in the header
+    wclear(header);
+    wresize(header, LINES, getmaxx(header));
+    mvwprintw(header, 0, 0, "Go to Google OAuth2 authorization URI. Use 'q' or 'Ctrl+c' to quit authorization process.\n%s", uri);
+    wrefresh(header);
+
+    int socketfd = socket(addr_res->ai_family, addr_res->ai_socktype, addr_res->ai_protocol);
+    if (socketfd < 0) {
+       perror("Error opening socket");
+    }
+
+    // reuse socket address
+    int yes=1;
+    setsockopt(socketfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes);
+
+    if (bind(socketfd, addr_res->ai_addr, addr_res->ai_addrlen) < 0) {
+       perror("Error binding socket");
+    }
+
+    freeaddrinfo(addr_res);
+
+    int ls = listen(socketfd, GOOGLE_OAUTH_REDIRECT_SOCKET_BACKLOG);
+    if (ls < 0) {
+       perror("Listen error");
+    }
+
+    struct pollfd pfds[2];
+
+    pfds[0].fd = STDIN_FILENO;
+    pfds[0].events = POLLIN;
+    pfds[1].fd = socketfd;
+    pfds[1].events = POLLIN;
+    int fd_count = 2;
+            
+    int connfd, bytes_rec, bytes_sent;
+    char http_header[8*1024];
+    char* reply =
+    "HTTP/1.1 200 OK\n"
+    "Content-Type: text/html\n"
+    "Connection: close\n\n"
+    "<html>"
+    "<head><title>Authorization successfull</title></head>"
+    "<body>"
+    "<p><b>Authorization successfull.</b></p>"
+    "<p>You consented that diary can access your Google calendar.<br/>"
+    "Pleasee close this window and return to diary.</p>"
+    "</body>"
+    "</html>";
+
+    // Handle descriptors read-to-read (POLLIN),
+    // stdin or server socker, whichever is first
+    for (;;) {
+        int poll_count = poll(pfds, fd_count, -1);
+
+        if (poll_count == -1) {
+            perror("Erro in poll");
+            break;
+        }
+
+        // Cancel through stdin
+        if (pfds[0].revents & POLLIN) {
+            noecho();
+            int ch = wgetch(header);
+            echo();
+            // sudo showkey -a 
+            // Ctrl+c: ^C 0x03
+            // q     :  q 0x71
+            if (ch == 0x03 || ch == 0x71) {
+                fprintf(stderr, "Escape char: %x\n", ch);
+                fprintf(stderr, "Hanging up, closing server socket\n");
+                break;
+            }
+        }
+        if (pfds[1].revents & POLLIN) {
+            // accept connections but ignore client addr
+            connfd = accept(socketfd, NULL, NULL);
+            if (connfd < 0) {
+               perror("Error accepting connection");
+               break;
+            }
+
+            bytes_rec = recv(connfd, http_header, sizeof http_header, 0);
+            if (bytes_rec < 0) {
+                perror("Error reading stream message");
+                break;
+            }
+            fprintf(stderr, "Received http header: %s\n", http_header);
+
+            bytes_sent = send(connfd, reply, strlen(reply), 0);
+            if (bytes_sent < 0) {
+               perror("Error sending");
+            }
+            fprintf(stderr, "Bytes sent: %i\n", bytes_sent);
+
+            close(connfd);
+            break;
+        }
+    } // end for ;;
+
+    // close server socket
+    close(pfds[1].fd);
+
+    char* code = extract_oauth_code(http_header);
+    if (code == NULL) {
+        fprintf(stderr, "Found no OAuth code in http header.\n");
+        return NULL;
+    }
+    fprintf(stderr, "OAuth code: %s\n", code);
+
+    return code;
+}
+
+char* caldav_req(struct tm* date, char* url, char* http_method, char* postfields, int depth) {
+    // only support depths 0 or 1
+    if (depth < 0 || depth > 1) {
+        return NULL;
+    }
+
+    // if access_token is NULL, the program segfaults
+    // while construcing the bearer_token below
+    if (access_token == NULL) {
+        return NULL;
+    }
+
+    CURLcode res;
+
+    curl = curl_easy_init();
+
+    // https://curl.se/libcurl/c/getinmemory.html
+    struct curl_mem_chunk caldav_resp;
+    caldav_resp.memory = malloc(1);
+    if (caldav_resp.memory == NULL) {
+        perror("malloc failed");
+        return NULL;
+    }
+    caldav_resp.size = 0;
+
+    if (curl) {
+        // fail if not authenticated, !CURLE_OK
+        curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1L);
+        // curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
+        curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, http_method);
+        curl_easy_setopt(curl, CURLOPT_URL, url);
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_write_mem_callback);
+        curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&caldav_resp);
+
+        // construct header fields
+        struct curl_slist *header = NULL;
+        char bearer_token[strlen("Authorization: Bearer")+strlen(access_token)];
+        sprintf(bearer_token, "Authorization: Bearer %s", access_token);
+        char depth_header[strlen("Depth: 0")];
+        sprintf(depth_header, "Depth: %i", depth);
+        header = curl_slist_append(header, depth_header);
+        header = curl_slist_append(header, bearer_token);
+        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, header);
+
+        // set postfields, if any
+        if (postfields != NULL) {
+            curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postfields);
+        }
+
+        res = curl_easy_perform(curl);
+
+        curl_easy_cleanup(curl);
+
+        fprintf(stderr, "Curl retrieved %lu bytes\n", (unsigned long)caldav_resp.size);
+        fprintf(stderr, "Curl content: %s\n", caldav_resp.memory);
+
+        if (res != CURLE_OK) {
+            fprintf(stderr, "Curl response: %s\n", caldav_resp.memory);
+            fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
+            return NULL;
+        }
+    }
+
+    return caldav_resp.memory;
+}
+
+// return current user principal from CalDAV XML response
+char* parse_caldav_current_user_principal(char* xml) {
+    char* xml_key_pos = strstr(xml, "<D:current-user-principal>");
+    // this XML does not contain a user principal at all
+    if (xml_key_pos == NULL) {
+        return NULL;
+    }
+
+    fprintf(stderr, "Found current-user-principal at position: %i\n", *xml_key_pos);
+
+    //<D:current-user-principal>
+    //<D:href>/caldav/v2/diary.in0rdr%40gmail.com/user</D:href>
+    char* tok = strtok(xml_key_pos, "<"); // D:current-user-principal>
+    if (tok != NULL) {
+        tok = strtok(NULL, "<"); // D:href>/caldav/v2/test%40gmail.com/user
+        fprintf(stderr, "First token: %s\n", tok);
+        tok = strstr(tok, ">"); // >/caldav/v2/test%40gmail.com/user
+        tok++; // cut >
+        char* tok_end = strrchr(tok, '/');
+        *tok_end = '\0'; // cut /user
+    }
+
+    return tok;
+}
+
+// return calendar uri from CalDAV home set XML response
+char* parse_caldav_calendar(char* xml, char* calendar) {
+    char displayname_needle[strlen(calendar) + strlen("<D:displayname></D:displayname>")];
+    sprintf(displayname_needle, "<D:displayname>%s</D:displayname>", calendar);
+    fprintf(stderr, "Displayname needle: %s\n", displayname_needle);
+    char* displayname_pos = strstr(xml, displayname_needle);
+    // this XML multistatus response does not contain the users calendar
+    if (displayname_pos == NULL) {
+        return NULL;
+    }
+
+    // <D:response>
+    //  <D:href>/caldav/v2/2fcv7j5mf38o5u2kg5tar4baao%40group.calendar.google.com/events/</D:href>
+    //  <D:propstat>
+    //   <D:status></D:status>
+    //   <D:prop>
+    //    <D:displayname>diary</D:displayname>
+    //   </D:prop>
+    //  </D:propstat>
+    // </D:response>
+
+    // shorten multistatus response and find last hyperlink
+    *displayname_pos= '\0';
+    char* href = strrstr(xml, "<D:href>");
+    if (href != NULL) {
+        fprintf(stderr, "Found calendar href: %s\n", href);
+        href = strtok(href, "<"); // :href>/caldav/v2/aaa%40group.calendar.google.com/events/
+        if (href != NULL) {
+            href = strchr(href, '>');
+            href++; // cut >
+            fprintf(stderr, "Found calendar href: %s\n", href);
+        }
+        return href;
+    }
+    return NULL;
+}
+
+void put_event(struct tm* date, const char* dir, size_t dir_size, char* calendar_uri) {
+    // get entry path
+    char path[100];
+    char* ppath = path;
+    char* descr;
+    long descr_bytes;
+
+    fpath(dir, dir_size, date, &ppath, sizeof path);
+    if (ppath == NULL) {
+        fprintf(stderr, "Error while retrieving file path for diary reading");
+        return;
+    }
+
+    FILE* fp = fopen(path, "r");
+    if (fp == NULL) perror("Error opening file");
+
+    fseek(fp, 0, SEEK_END);
+    descr_bytes = ftell(fp);
+    rewind(fp);
+
+    size_t descr_labell = strlen("DESCRIPTION:");
+    size_t descrl = descr_bytes + descr_labell + 1;
+    descr = malloc(descrl);
+    if (descr == NULL) {
+        perror("malloc failed");
+        return;
+    }
+
+    descr[0] = '\0';
+    strcat(descr, "DESCRIPTION:");
+
+    int items_read = fread(descr + descr_labell, sizeof(char), descr_bytes, fp);
+    if (items_read != descr_bytes) {
+        fprintf(stderr, "Read %i items but expected %li, aborting.", items_read, descr_bytes);
+        return;
+    }
+
+    descr[descrl] = '\0';
+    fprintf(stderr, "File buffer that will be uploaded to the remote CalDAV server:\n%s\n", descr);
+
+    char* folded_descr = fold(descr);
+    fprintf(stderr, "Folded descr:%s\n", folded_descr);
+
+    char uid[9];
+    strftime(uid, sizeof uid, "%Y%m%d", date);
+
+    char* ics = "BEGIN:VCALENDAR\n"
+                "BEGIN:VEVENT\n"
+                "UID:%s\n"
+                "DTSTART;VALUE=DATE:%s\n"
+                "SUMMARY:%s\n"
+                "%s\n"
+                "END:VEVENT\n"
+                "END:VCALENDAR";
+    char postfields[strlen(ics) + strlen(folded_descr) + 100];
+    sprintf(postfields, ics,
+            uid,
+            uid,
+            uid, // todo: display first few chars of DESCRIPTION as SUMMARY
+            folded_descr);
+
+    fprintf(stderr, "PUT event postfields:\n%s\n", postfields);
+
+    strcat(calendar_uri, uid);
+    strcat(calendar_uri, ".ics");
+    fprintf(stderr, "Event uri:\n%s\n", calendar_uri);
+    char* response = caldav_req(date, calendar_uri, "PUT", postfields, 0);
+    fprintf(stderr, "PUT event response:\n%s\n", response);
+    fclose(fp);
+    free(folded_descr);
+    free(descr);
+
+    if (response == NULL) {
+        fprintf(stderr, "PUT event failed.\n");
+    }
+}
+
+void* show_progress(void* vargp){
+    WINDOW* header = (WINDOW*) vargp;
+    mvwprintw(header, 0, COLS - CAL_WIDTH - ASIDE_WIDTH - 11, "   syncing ");
+    for(;;) {
+        mvwprintw(header, 0, COLS - CAL_WIDTH - ASIDE_WIDTH - 10, "|");
+        wrefresh(header);
+        usleep(200000);
+        mvwprintw(header, 0, COLS - CAL_WIDTH - ASIDE_WIDTH - 10, "/");
+        wrefresh(header);
+        usleep(200000);
+        mvwprintw(header, 0, COLS - CAL_WIDTH - ASIDE_WIDTH - 10, "-");
+        wrefresh(header);
+        usleep(200000);
+        mvwprintw(header, 0, COLS - CAL_WIDTH - ASIDE_WIDTH - 10, "\\");
+        wrefresh(header);
+        usleep(200000);
+    }
+}
+
+/*
+* Sync with CalDAV server.
+* Returns the answer char of the confirmation dialogue
+* Returns 0 if neither local nor remote file exists.
+* Otherwise, returns -1 on error.
+*/
+int caldav_sync(struct tm* date,
+                 WINDOW* header,
+                 WINDOW* cal,
+                 int pad_pos,
+                 const char* dir,
+                 size_t dir_size,
+                 bool confirm) {
+    pthread_t progress_tid;
+    pthread_create(&progress_tid, NULL, show_progress, (void*)header);
+
+    // fetch existing API tokens
+    char* tokfile = read_tokenfile();
+    free(tokfile);
+
+    if (access_token == NULL && refresh_token == NULL) {
+        // no access token exists yet, create new verifier
+        char challenge[GOOGLE_OAUTH_CODE_VERIFIER_LENGTH];
+        random_code_challenge(GOOGLE_OAUTH_CODE_VERIFIER_LENGTH, challenge);
+        fprintf(stderr, "Challenge/Verifier: %s\n", challenge);
+
+        // fetch new code with verifier
+        char* code = get_oauth_code(challenge, header);
+        if (code == NULL) {
+            fprintf(stderr, "Error retrieving access code.\n");
+            return -1;
+        }
+
+        // get acess token using code and verifier
+        get_access_token(code, challenge, false);
+    }
+
+    char* principal_postfields = "<d:propfind xmlns:d='DAV:' xmlns:cs='http://calendarserver.org/ns/'>"
+                                 "<d:prop><d:current-user-principal/></d:prop>"
+                                 "</d:propfind>";
+
+
+    // check if we can use the token from the tokenfile
+    char* user_principal = caldav_req(date, GOOGLE_CALDAV_URI, "PROPFIND", principal_postfields, 0);
+    fprintf(stderr, "User principal: %s\n", user_principal);
+
+    if (user_principal == NULL) {
+        fprintf(stderr, "Unable to fetch principal, refreshing API token.\n");
+        // The principal could not be fetched,
+        // get new acess token with refresh token
+        get_access_token(NULL, NULL, true);
+        // Retry request for event with new token
+        user_principal = caldav_req(date, GOOGLE_CALDAV_URI, "PROPFIND", principal_postfields, 0);
+    }
+
+    char* tokenfile_path = expand_path(CONFIG.google_tokenfile);
+    if (user_principal == NULL) {
+        fprintf(stderr, "Unable to fetch principal due to invalid tokenfile. Removing tokenfile '%s'.\n", CONFIG.google_tokenfile);
+
+        wclear(header);
+        mvwprintw(header, 0, 0, "Invalid Google OAuth2 credentials, removing tokenfile at '%s'. Please retry.", CONFIG.google_tokenfile);
+        wrefresh(header);
+
+        // accept any input to proceed
+        noecho();
+        wgetch(header);
+        echo();
+
+        if (unlink(tokenfile_path) == -1) {
+            perror("unlink tokenfile");
+        }
+
+        free(access_token);
+        access_token = NULL;
+        free(refresh_token);
+        refresh_token = NULL;
+        pthread_cancel(progress_tid);
+        wclear(header);
+        return -1;
+    }
+
+    user_principal = parse_caldav_current_user_principal(user_principal);
+    fprintf(stderr, "\nUser Principal: %s\n", user_principal);
+
+    // get the home-set of the user
+    char uri[300];
+    sprintf(uri, "%s%s", GOOGLE_API_URI, user_principal);
+    fprintf(stderr, "\nHome Set URI: %s\n", uri);
+    char* home_set = caldav_req(date, uri, "PROPFIND", "", 1);
+    fprintf(stderr, "\nHome Set: %s\n", home_set);
+
+    // get calendar URI from the home-set
+    char* calendar_href = parse_caldav_calendar(home_set, CONFIG.google_calendar);
+    fprintf(stderr, "\nCalendar href: %s\n", calendar_href);
+
+    char* xml_filter = "<c:calendar-query xmlns:d='DAV:' xmlns:c='urn:ietf:params:xml:ns:caldav'>"
+                       "<d:prop><c:calendar-data/></d:prop>"
+                       "<c:filter><c:comp-filter name='VCALENDAR'>"
+                       "<c:comp-filter name='VEVENT'>"
+                       "<c:time-range start='%s' end='%s'/></c:comp-filter>"
+                       "</c:comp-filter></c:filter></c:calendar-query>";
+
+    // construct next day from date+1
+    time_t date_time = mktime(date);
+    struct tm* next_day = localtime(&date_time);
+    next_day->tm_mday++;
+    mktime(next_day);
+
+    char dstr_cursor[30];
+    char dstr_next_day[30];
+
+    char* format = "%Y%m%dT000000Z";
+    strftime(dstr_cursor, sizeof dstr_cursor, format, date);
+    strftime(dstr_next_day, sizeof dstr_next_day, format, next_day);
+
+    char caldata_postfields[strlen(xml_filter)+50];
+    sprintf(caldata_postfields, xml_filter,
+            dstr_cursor,
+            dstr_next_day);
+    fprintf(stderr, "Calendar data postfields:\n%s\n", caldata_postfields);
+
+    // fetch event for the cursor date
+    sprintf(uri, "%s%s", GOOGLE_API_URI, calendar_href);
+    fprintf(stderr, "\nCalendar URI: %s\n", uri);
+    char* event = caldav_req(date, uri, "REPORT", caldata_postfields, 0);
+    fprintf(stderr, "Event:\n%s", event);
+    // todo: warn if multiple events,
+    // multistatus has more than just one caldav:calendar-data elements
+
+    // get path of entry
+    char path[100];
+    char* ppath = path;
+    fpath(CONFIG.dir, strlen(CONFIG.dir), date, &ppath, sizeof path);
+    fprintf(stderr, "Cursor date file path: %s\n", path);
+
+    bool local_file_exists = true;
+    bool remote_file_exists = true;
+
+    // check last modification time of local time
+    struct stat attr;
+    if (stat(path, &attr) != 0) {
+        perror("Stat failed");
+        local_file_exists = false;
+    }
+    struct tm* localfile_time = gmtime(&attr.st_mtime);
+    fprintf(stderr, "Local dst: %i\n", localfile_time->tm_isdst);
+    //local_time->tm_isdst = -1;
+    time_t localfile_date = mktime(localfile_time);
+    fprintf(stderr, "Local dst: %i\n", localfile_time->tm_isdst);
+    fprintf(stderr, "Local file last modified time: %s\n", ctime(&localfile_date));
+    fprintf(stderr, "Local file last modified time: %s\n", ctime(&attr.st_mtime));
+
+    struct tm remote_datetime;
+    time_t remote_date;
+
+    // check remote LAST-MODIFIED:20210521T212441Z of remote event
+    char* remote_last_mod = extract_ical_field(event, "LAST-MODIFIED", false);
+    char* remote_uid = extract_ical_field(event, "UID", false);
+    fprintf(stderr, "Remote last modified: %s\n", remote_last_mod);
+    fprintf(stderr, "Remote UID: %s\n", remote_uid);
+    if (remote_last_mod == NULL) {
+        remote_file_exists = false;
+    } else {
+        strptime(remote_last_mod, "%Y%m%dT%H%M%SZ", &remote_datetime);
+        //remote_datetime.tm_isdst = -1;
+        fprintf(stderr, "Remote dst: %i\n", remote_datetime.tm_isdst);
+        remote_date = mktime(&remote_datetime);
+        fprintf(stderr, "Remote dst: %i\n", remote_datetime.tm_isdst);
+        fprintf(stderr, "Remote last modified: %s\n", ctime(&remote_date));
+    }
+
+    if (! (local_file_exists || remote_file_exists)) {
+        fprintf(stderr, "Neither local nor remote file exists, giving up.\n");
+        pthread_cancel(progress_tid);
+        wclear(header);
+        return 0;
+    }
+
+    double timediff = difftime(localfile_date, remote_date);
+    fprintf(stderr, "Time diff between local and remote mod time:%e\n", timediff);
+
+    if ((timediff > 0 && local_file_exists) || (local_file_exists && !remote_file_exists)) {
+        // local time > remote time
+        // if local file mod time more recent than LAST-MODIFIED
+
+        if (remote_file_exists) {
+            // purge any existing daily calendar entries on the remote side
+            char event_uri[300];
+            sprintf(event_uri, "%s%s%s.ics", GOOGLE_API_URI, calendar_href, remote_uid);
+
+            caldav_req(date, event_uri, "DELETE", "", 0);
+        }
+
+        fputs("Local file is newer, uploading to remote...\n", stderr);
+        put_event(date, dir, dir_size, uri);
+
+        pthread_cancel(progress_tid);
+        wclear(header);
+
+    }
+
+    char* rmt_desc;
+    char dstr[16];
+    int conf_ch;
+    if ((timediff < 0 && remote_file_exists) || (!local_file_exists && remote_file_exists)) {
+        rmt_desc = extract_ical_field(event, "DESCRIPTION", true);
+        fprintf(stderr, "Remote event description:%s\n", rmt_desc);
+
+        if (rmt_desc == NULL) {
+            fprintf(stderr, "Could not fetch description of remote event.\n");
+            pthread_cancel(progress_tid);
+            wclear(header);
+            return -1;
+        }
+
+        if (confirm) {
+            // prepare header for confirmation dialogue
+            curs_set(2);
+            noecho();
+            pthread_cancel(progress_tid);
+            wclear(header);
+        }
+
+        // ask for confirmation
+        strftime(dstr, sizeof dstr, CONFIG.fmt, date);
+        mvwprintw(header, 0, 0, "Remote event is more recent. Sync entry '%s' and overwrite local file? [(Y)es/(a)all/(n)o/(c)ancel] ", dstr);
+        bool conf = false;
+        while (!conf) {
+            conf_ch = wgetch(header);
+            if (conf_ch == 'y' || conf_ch == 'Y' || 'a' || conf_ch == '\n' || !confirm) {
+                fprintf(stderr, "Remote file is newer, extracting description from remote...\n");
+
+                // persist downloaded buffer to local file
+                FILE* cursordate_file = fopen(path, "wb");
+                if (cursordate_file == NULL) {
+                    perror("Failed to open cursor date file");
+                } else {
+                    for (char* i = rmt_desc; *i != '\0'; i++) {
+                        if (rmt_desc[i-rmt_desc] == 0x5C) { // backslash
+                            switch (*(i+1)) {
+                                case 'n':
+                                    fputc('\n', cursordate_file);
+                                    i++;
+                                    break;
+                                case 0x5c: // preserve real backslash
+                                    fputc(0x5c, cursordate_file);
+                                    i++;
+                                    break;
+                            }
+                        } else {
+                            fputc(*i, cursordate_file);
+                        }
+                    }
+                }
+                fclose(cursordate_file);
+
+                // add new entry highlight
+                chtype atrs = winch(cal) & A_ATTRIBUTES;
+                wchgat(cal, 2, atrs | A_BOLD, 0, NULL);
+                prefresh(cal, pad_pos, 0, 1, ASIDE_WIDTH, LINES - 1, ASIDE_WIDTH + CAL_WIDTH);
+            }
+            break;
+        }
+
+        echo();
+        curs_set(0);
+        free(rmt_desc);
+    }
+    return conf_ch;
+}
diff --git a/src/caldav.h b/src/caldav.h
@@ -0,0 +1,54 @@
+#ifndef DIARY_CALDAV_H
+#define DIARY_CALDAV_H
+
+#define __USE_XOPEN
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <time.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/poll.h>
+#include <netdb.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <ncurses.h>
+#include <curl/curl.h>
+#include "utils.h"
+
+#define STR(s) #s
+#define MKSTR(s) STR(s)
+
+// https://developers.google.com/identity/protocols/oauth2/native-app#create-code-challenge
+// A valid code_verifier has a length between 43 and 128 characters
+#define GOOGLE_OAUTH_CODE_VERIFIER_LENGTH 43
+#define GOOGLE_OAUTH_AUTHZ_URL "https://accounts.google.com/o/oauth2/auth"
+#define GOOGLE_OAUTH_TOKEN_URL "https://oauth2.googleapis.com/token"
+#define GOOGLE_OAUTH_SCOPE "https://www.googleapis.com/auth/calendar%20https://www.googleapis.com/auth/calendar.events.owned"
+#define GOOGLE_OAUTH_RESPONSE_TYPE "code"
+#define GOOGLE_OAUTH_REDIRECT_HOST "127.0.0.1"
+#define GOOGLE_OAUTH_REDIRECT_PORT 9004
+#define GOOGLE_OAUTH_REDIRECT_URI "http://" GOOGLE_OAUTH_REDIRECT_HOST ":" MKSTR(GOOGLE_OAUTH_REDIRECT_PORT)
+#define GOOGLE_OAUTH_REDIRECT_SOCKET_BACKLOG 10
+#define GOOGLE_API_URI "https://apidata.googleusercontent.com"
+#define GOOGLE_CALDAV_URI GOOGLE_API_URI "/caldav/v2"
+
+int caldav_sync(struct tm* date,
+                 WINDOW* header,
+                 WINDOW* cal,
+                 int pad_pos,
+                 const char* dir,
+                 size_t dir_size,
+                 bool confirm);
+
+struct curl_mem_chunk {
+    char* memory;
+    size_t size;
+};
+
+#endif
diff --git a/src/diary.c b/src/diary.c
@@ -0,0 +1,687 @@
+#include "diary.h"
+
+int cy, cx;
+time_t raw_time;
+struct tm today;
+struct tm curs_date;
+struct tm cal_start;
+struct tm cal_end;
+
+// normally leap is every 4 years,
+// but is skipped every 100 years,
+// unless it is divisible by 400
+#define is_leap(yr) ((yr % 400 == 0) || (yr % 4 == 0 && yr % 100 != 0))
+
+void setup_cal_timeframe() {
+    raw_time = time(NULL);
+    localtime_r(&raw_time, &today);
+    curs_date = today;
+
+    cal_start = today;
+    cal_start.tm_year -= CONFIG.range;
+    cal_start.tm_mon = 0;
+    cal_start.tm_mday = 1;
+    mktime(&cal_start);
+
+    if (cal_start.tm_wday != CONFIG.weekday) {
+        // adjust start date to weekday before 01.01
+        cal_start.tm_year--;
+        cal_start.tm_mon = 11;
+        cal_start.tm_mday = 31 - (cal_start.tm_wday - CONFIG.weekday) + 1;
+        mktime(&cal_start);
+    }
+
+    cal_end = today;
+    cal_end.tm_year += CONFIG.range;
+    cal_end.tm_mon = 11;
+    cal_end.tm_mday = 31;
+    mktime(&cal_end);
+}
+
+void draw_wdays(WINDOW* head) {
+    int i;
+    for (i = CONFIG.weekday; i < CONFIG.weekday + 7; i++) {
+        waddstr(head, WEEKDAYS[i % 7]);
+        waddch(head, ' ');
+    }
+    wrefresh(head);
+}
+
+void draw_calendar(WINDOW* number_pad, WINDOW* month_pad, const char* diary_dir, size_t diary_dir_size) {
+    struct tm i = cal_start;
+    char month[10];
+    bool has_entry;
+
+    while (mktime(&i) <= mktime(&cal_end)) {
+        has_entry = date_has_entry(diary_dir, diary_dir_size, &i);
+
+        if (has_entry)
+            wattron(number_pad, A_BOLD);
+
+        wprintw(number_pad, "%2i", i.tm_mday);
+
+        if (has_entry)
+            wattroff(number_pad, A_BOLD);
+
+        waddch(number_pad, ' ');
+
+        // print month in sidebar
+        if (i.tm_mday == 1) {
+            strftime(month, sizeof month, "%b", &i);
+            getyx(number_pad, cy, cx);
+            mvwprintw(month_pad, cy, 0, "%s ", month);
+        }
+
+        i.tm_mday++;
+        mktime(&i);
+    }
+}
+
+bool go_to(WINDOW* calendar, WINDOW* aside, time_t date, int* cur_pad_pos) {
+    if (date < mktime(&cal_start) || date > mktime(&cal_end))
+        return false;
+
+    int diff_seconds = date - mktime(&cal_start);
+    int diff_days = diff_seconds / 60 / 60 / 24;
+    int diff_weeks = diff_days / 7;
+    int diff_wdays = diff_days % 7;
+
+    localtime_r(&date, &curs_date);
+
+    getyx(calendar, cy, cx);
+
+    // remove the STANDOUT attribute from the day we are leaving
+    chtype current_attrs = mvwinch(calendar, cy, cx) & A_ATTRIBUTES;
+    // leave every attr as is, but turn off STANDOUT
+    current_attrs &= ~A_STANDOUT;
+    mvwchgat(calendar, cy, cx, 2, current_attrs, 0, NULL);
+
+    // add the STANDOUT attribute to the day we are entering
+    chtype new_attrs =  mvwinch(calendar, diff_weeks, diff_wdays * 3) & A_ATTRIBUTES;
+    new_attrs |= A_STANDOUT;
+    mvwchgat(calendar, diff_weeks, diff_wdays * 3, 2, new_attrs, 0, NULL);
+
+    if (diff_weeks < *cur_pad_pos)
+        *cur_pad_pos = diff_weeks;
+    if (diff_weeks > *cur_pad_pos + LINES - 2)
+        *cur_pad_pos = diff_weeks - LINES + 2;
+    prefresh(aside, *cur_pad_pos, 0, 1, 0, LINES - 1, ASIDE_WIDTH);
+    prefresh(calendar, *cur_pad_pos, 0, 1, ASIDE_WIDTH, LINES - 1, ASIDE_WIDTH + CAL_WIDTH);
+
+    return true;
+}
+
+/* Update window 'win' with diary entry from date 'date' */
+void display_entry(const char* dir, size_t dir_size, const struct tm* date, WINDOW* win, int width) {
+    char path[100];
+    char* ppath = path;
+    int c;
+
+    // get entry path
+    fpath(dir, dir_size, date, &ppath, sizeof path);
+    if (ppath == NULL) {
+        fprintf(stderr, "Error while retrieving file path for diary reading");
+        return;
+    }
+
+    wclear(win);
+
+    if (date_has_entry(dir, dir_size, date)) {
+        FILE* fp = fopen(path, "r");
+        if (fp == NULL) perror("Error opening file");
+
+        wmove(win, 0, 0);
+        while((c = getc(fp)) != EOF) waddch(win, c);
+
+        fclose(fp);
+    }
+
+    wrefresh(win);
+}
+
+/* Writes edit command for 'date' entry to 'rcmd'. '*rcmd' is NULL on error. */
+void edit_cmd(const char* dir, size_t dir_size, const struct tm* date, char** rcmd, size_t rcmd_size) {
+    // set the edit command to env editor
+    if (strlen(CONFIG.editor) + 2 > rcmd_size) {
+        fprintf(stderr, "Binary path of default editor too long");
+        *rcmd = NULL;
+        return;
+    }
+    strcpy(*rcmd, CONFIG.editor);
+    strcat(*rcmd, " ");
+
+    // get path of entry
+    char path[100];
+    char* ppath = path;
+    fpath(dir, dir_size, date, &ppath, sizeof path);
+
+    if (ppath == NULL) {
+        fprintf(stderr, "Error while retrieving file path for editing");
+        *rcmd = NULL;
+        return;
+    }
+
+    // concatenate editor command with entry path
+    if (strlen(*rcmd) + strlen(path) + 1 > rcmd_size) {
+        fprintf(stderr, "Edit command too long");
+        return;
+    }
+    strcat(*rcmd, path);
+}
+
+bool date_has_entry(const char* dir, size_t dir_size, const struct tm* i) {
+    char epath[100];
+    char* pepath = epath;
+
+    // get entry path and check for existence
+    fpath(dir, dir_size, i, &pepath, sizeof epath);
+
+    if (pepath == NULL) {
+        fprintf(stderr, "Error while retrieving file path for checking entry existence");
+        return false;
+    }
+
+    return (access(epath, F_OK) != -1);
+}
+
+/*
+ * Finds the date with a diary entry closest to <current>.
+ * Depending on <search_backwards>, it will find the most recent
+ * previous date or the oldest next date with an entry. If no
+ * entry is found within the calendar size, <current> is returned.
+ */
+struct tm find_closest_entry(const struct tm current,
+                             bool search_backwards,
+                             const char* diary_dir,
+                             size_t diary_dir_size) {
+    time_t end_time = mktime(&cal_end);
+    time_t start_time = mktime(&cal_start);
+
+    int step = search_backwards ? -1 : +1;
+
+    struct tm it = current;
+    it.tm_mday += step;
+    time_t it_time = mktime(&it);
+
+    for( ; it_time >= start_time && it_time <= end_time; it_time = mktime(&it)) {
+        if (date_has_entry(diary_dir, diary_dir_size, &it)) {
+            return it;
+        }
+        it.tm_mday += step;
+    }
+
+    return current;
+}
+
+bool read_config(const char* file_path) {
+    char* expaned_value;
+    char config_file_path[256];
+
+    expaned_value = expand_path(file_path);
+    strcpy(config_file_path, expaned_value);
+    free(expaned_value);
+
+    // check if config file is readable
+    if( access( config_file_path, R_OK ) != 0 ) {
+        fprintf(stderr, "Config file '%s' not readable, skipping\n", config_file_path);
+        return false;
+    }
+
+    char key_buf[80];
+    char value_buf[80];
+    char line[256];
+    FILE * pfile;
+
+    // read config file line by line
+    pfile = fopen(config_file_path, "r");
+    while (fgets(line, sizeof line, pfile)) {
+        // ignore comment lines
+        if (*line == '#' || *line == ';') continue;
+
+        if (sscanf(line, "%s = %s", key_buf, value_buf) == 2) {
+            if (strcmp("dir", key_buf) == 0) {
+                expaned_value = expand_path(value_buf);
+                strcpy(CONFIG.dir, expaned_value);
+                free(expaned_value);
+            } else if (strcmp("range", key_buf) == 0) {
+                CONFIG.range = atoi(value_buf);
+            } else if (strcmp("weekday", key_buf) == 0) {
+                CONFIG.weekday = atoi(value_buf);
+            } else if (strcmp("fmt", key_buf) == 0) {
+                CONFIG.fmt = (char *) malloc(strlen(value_buf) + 1 * sizeof(char));
+                strcpy(CONFIG.fmt, value_buf);
+            } else if (strcmp("editor", key_buf) == 0) {
+                CONFIG.editor = (char *) malloc(strlen(value_buf) + 1 * sizeof(char));
+                strcpy(CONFIG.editor, value_buf);
+            } else if (strcmp("google_tokenfile", key_buf) == 0) {
+                expaned_value = expand_path(value_buf);
+                strcpy(CONFIG.google_tokenfile, expaned_value);
+                free(expaned_value);
+            } else if (strcmp("google_clientid", key_buf) == 0) {
+                CONFIG.google_clientid = (char *) malloc(strlen(value_buf) + 1 * sizeof(char));
+                strcpy(CONFIG.google_clientid, value_buf);
+            } else if (strcmp("google_secretid", key_buf) == 0) {
+                CONFIG.google_secretid = (char *) malloc(strlen(value_buf) + 1 * sizeof(char));
+                strcpy(CONFIG.google_secretid, value_buf);
+            } else if (strcmp("google_calendar", key_buf) == 0) {
+                CONFIG.google_calendar = (char *) malloc(strlen(value_buf) + 1 * sizeof(char));
+                strcpy(CONFIG.google_calendar, value_buf);
+            }
+        }
+    }
+    fclose (pfile);
+    return true;
+}
+
+void usage() {
+  printf("Usage : diary [OPTION]... [DIRECTORY]...\n");
+  printf("\n");
+  printf("Diary, journaling TUI (v%s)\n", DIARY_VERSION);
+  printf("Edit journal entries from the command line\n");
+  printf("\n");
+  printf("Options:\n");
+  printf("  -v, --version                 : Print diary version\n");
+  printf("  -h, --help                    : Show diary help text\n");
+  printf("  -d, --dir           DIARY_DIR : Diary storage directory DIARY_DIR\n");
+  printf("  -e, --editor        EDITOR    : Editor to open journal files with\n");
+  printf("  -f, --fmt           FMT       : Date and file format, change with care\n");
+  printf("  -r, --range         RANGE     : RANGE is the number of years to show before/after today's date\n");
+  printf("  -w, --weekday       DAY       : First day of the week, 0 = Sun, 1 = Mon, ..., 6 = Sat\n");
+  printf("\n");
+  printf("Full docs and keyboard shortcuts: 'man diary'\n");
+  printf("or online via: <https://github.com/in0rdr/diary>\n");
+}
+
+int main(int argc, char** argv) {
+    setlocale(LC_ALL, "");
+    char* env_var;
+    char* config_home;
+    char* config_file_path;
+    chtype atrs;
+
+    // the diary directory defaults to the diary_dir specified in the config file
+    config_home = getenv("XDG_CONFIG_HOME");
+    if (config_home == NULL) config_home = XDG_CONFIG_HOME_FALLBACK;
+    // concat config home with the file path to the config file
+    config_file_path = (char *) calloc(strlen(config_home) + strlen(CONFIG_FILE_PATH) + 1, sizeof(char));
+    sprintf(config_file_path, "%s/%s", config_home, CONFIG_FILE_PATH);
+    // read config from config file path
+    read_config(config_file_path);
+
+    // get diary directory from environment
+    env_var = getenv("DIARY_DIR");
+    if (env_var != NULL) {
+        // if available, overwrite the diary directory with the environment variable
+        CONFIG.dir = (char *) calloc(strlen(env_var) + 1, sizeof(char));
+        strcpy(CONFIG.dir, env_var);
+    }
+
+    // get editor from environment
+    env_var = getenv("EDITOR");
+    if (env_var != NULL) {
+        // if available, overwrite the editor with the environments EDITOR
+        CONFIG.editor = (char *) calloc(strlen(env_var) + 1, sizeof(char));
+        strcpy(CONFIG.editor, env_var);
+    }
+
+    // get locale from environment variable LANG
+    // https://www.gnu.org/software/gettext/manual/html_node/Locale-Environment-Variables.html
+    env_var = getenv("LANG");
+    if (env_var != NULL) {
+        // if available, overwrite the editor with the environments locale
+        #ifdef __GNU_LIBRARY__
+            // references: locale(5) and util-linux's cal.c
+            // get the base date, 8-digit integer (YYYYMMDD) returned as char *
+            #ifdef _NL_TIME_WEEK_1STDAY
+                unsigned long d = (uintptr_t) nl_langinfo(_NL_TIME_WEEK_1STDAY);
+            // reference: https://sourceware.org/glibc/wiki/Locales
+            // assign a static date value 19971130 (a Sunday)
+            #else
+                unsigned long d = 19971130;
+            #endif
+            struct tm base = {
+                .tm_sec = 0,
+                .tm_min = 0,
+                .tm_hour = 0,
+                .tm_mday = d % 100,
+                .tm_mon = (d / 100) % 100 - 1,
+                .tm_year = d / (100 * 100) - 1900
+            };
+            mktime(&base);
+            // weekday is base date's day of the week offset by (_NL_TIME_FIRST_WEEKDAY - 1)
+            #ifdef __linux__
+                CONFIG.weekday = (base.tm_wday + *nl_langinfo(_NL_TIME_FIRST_WEEKDAY) - 1) % 7;
+            #elif defined __MACH__
+                CFIndex first_day_of_week;
+                CFCalendarRef currentCalendar = CFCalendarCopyCurrent();
+                first_day_of_week = CFCalendarGetFirstWeekday(currentCalendar);
+                CFRelease(currentCalendar);
+                CONFIG.weekday = (base.tm_wday + first_day_of_week - 1) % 7;
+            #endif
+        #endif
+    }
+
+    // get the diary directory via argument, this takes precedence over env/config
+    if (argc < 2) {
+        if (CONFIG.dir == NULL) {
+            fprintf(stderr, "The diary directory must be provided as (non-option) arg, `--dir` arg,\n"
+                            "or in the DIARY_DIR environment variable, see `diary --help` or DIARY(1)\n");
+            return 1;
+        }
+    } else {
+        int option_char;
+        int option_index = 0;
+
+        // define options, see GETOPT(3)
+        static const struct option long_options[] = {
+            { "version",       no_argument,       0, 'v' },
+            { "help",          no_argument,       0, 'h' },
+            { "dir",           required_argument, 0, 'd' },
+            { "editor",        required_argument, 0, 'e' },
+            { "fmt",           required_argument, 0, 'f' },
+            { "range",         required_argument, 0, 'r' },
+            { "weekday",       required_argument, 0, 'w' },
+            { 0,               0,                 0,  0  }
+        };
+
+        // read option characters
+        while (1) {
+            option_char = getopt_long(argc, argv, "vhd:r:w:f:e:", long_options, &option_index);
+
+            if (option_char == -1) {
+                break;
+            }
+
+            switch (option_char) {
+                case 'v':
+                    // show program version
+                    printf("v%s\n", DIARY_VERSION);
+                    return 0;
+                    break;
+                case 'h':
+                    // show help text
+                    // printf("see man(1) diary\n");
+                    usage();
+                    return 0;
+                    break;
+                case 'd':
+                    // set diary directory from option character
+                    CONFIG.dir = (char *) calloc(strlen(optarg) + 1, sizeof(char));
+                    strcpy(CONFIG.dir, optarg);
+                    break;
+                case 'r':
+                    // set year range from option character
+                    CONFIG.range = atoi(optarg);
+                    break;
+                case 'w':
+                    // set first week day from option character
+                    fprintf(stderr, "%i\n", atoi(optarg));
+                    CONFIG.weekday = atoi(optarg);
+                    break;
+                case 'f':
+                    // set date format from option character
+                    CONFIG.fmt = (char *) calloc(strlen(optarg) + 1, sizeof(char));
+                    strcpy(CONFIG.fmt, optarg);
+                    break;
+                case 'e':
+                    // set default editor from option character
+                    CONFIG.editor = (char *) calloc(strlen(optarg) + 1, sizeof(char));
+                    strcpy(CONFIG.editor, optarg);
+                    break;
+                default:
+                    printf("?? getopt returned character code 0%o ??\n", option_char);
+            }
+        }
+
+        if (optind < argc) {
+            // set diary directory from first non-option argv-element,
+            // required for backwarad compatibility with diary <= 0.4
+            CONFIG.dir = (char *) calloc(strlen(argv[optind]) + 1, sizeof(char));
+            strcpy(CONFIG.dir, argv[optind]);
+        }
+    }
+
+    // check if that directory exists
+    DIR* diary_dir_ptr = opendir(CONFIG.dir);
+    if (diary_dir_ptr) {
+        // directory exists, continue
+        closedir(diary_dir_ptr);
+    } else if (errno == ENOENT) {
+        fprintf(stderr, "The directory '%s' does not exist\n", CONFIG.dir);
+        return 2;
+    } else {
+        fprintf(stderr, "The directory '%s' could not be opened\n", CONFIG.dir);
+        return 1;
+    }
+
+    setup_cal_timeframe();
+
+    initscr();
+    raw();
+    curs_set(0);
+
+    WINDOW* header = newwin(1, COLS - CAL_WIDTH - ASIDE_WIDTH, 0, ASIDE_WIDTH + CAL_WIDTH);
+    wattron(header, A_BOLD);
+    update_date(header, &curs_date);
+    WINDOW* wdays = newwin(1, 3 * 7, 0, ASIDE_WIDTH);
+    draw_wdays(wdays);
+
+    WINDOW* aside = newpad((CONFIG.range * 2 + 1) * 12 * MAX_MONTH_HEIGHT, ASIDE_WIDTH);
+    WINDOW* cal = newpad((CONFIG.range * 2 + 1) * 12 * MAX_MONTH_HEIGHT, CAL_WIDTH);
+    keypad(cal, TRUE);
+    draw_calendar(cal, aside, CONFIG.dir, strlen(CONFIG.dir));
+
+    int ch, conf_ch;
+    int pad_pos = 0;
+    int syear = 0, smonth = 0, sday = 0;
+    struct tm new_date;
+    int prev_width = COLS - ASIDE_WIDTH - CAL_WIDTH;
+    int prev_height = LINES - 1;
+    size_t diary_dir_size = strlen(CONFIG.dir);
+
+    bool mv_valid = go_to(cal, aside, raw_time, &pad_pos);
+    // mark current day
+    atrs = winch(cal) & A_ATTRIBUTES;
+    wchgat(cal, 2, atrs | A_UNDERLINE, 0, NULL);
+    prefresh(cal, pad_pos, 0, 1, ASIDE_WIDTH, LINES - 1, ASIDE_WIDTH + CAL_WIDTH);
+
+    WINDOW* prev = newwin(prev_height, prev_width, 1, ASIDE_WIDTH + CAL_WIDTH);
+    display_entry(CONFIG.dir, diary_dir_size, &today, prev, prev_width);
+
+
+    do {
+        ch = wgetch(cal);
+        // new_date represents the desired date the user wants to go_to(),
+        // which may not be a feasible date at all
+        new_date = curs_date;
+        char ecmd[150];
+        char* pecmd = ecmd;
+        char pth[100];
+        char* ppth = pth;
+        char dstr[16];
+        time_t end_time = mktime(&cal_end);
+        struct tm it = cal_start;
+        time_t it_time = mktime(&it);
+        edit_cmd(CONFIG.dir, diary_dir_size, &new_date, &pecmd, sizeof ecmd);
+
+        switch(ch) {
+            // basic movements
+            case 'j':
+            case KEY_DOWN:
+                new_date.tm_mday += 7;
+                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
+                break;
+            case 'k':
+            case KEY_UP:
+                new_date.tm_mday -= 7;
+                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
+                break;
+            case 'l':
+            case KEY_RIGHT:
+                new_date.tm_mday++;
+                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
+                break;
+            case 'h':
+            case KEY_LEFT:
+                new_date.tm_mday--;
+                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
+                break;
+
+            // jump to top/bottom of page
+            case 'g':
+                new_date = find_closest_entry(cal_start, false, CONFIG.dir, diary_dir_size);
+                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
+                break;
+            case 'G':
+                new_date = find_closest_entry(cal_end, true, CONFIG.dir, diary_dir_size);
+                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
+                break;
+
+            // jump backward/forward by a month
+            case 'K':
+                if (new_date.tm_mday == 1)
+                    new_date.tm_mon--;
+                new_date.tm_mday = 1;
+                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
+                break;
+            case 'J':
+                new_date.tm_mon++;
+                new_date.tm_mday = 1;
+                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
+                break;
+
+            // find specific date
+            case 'f':
+                wclear(header);
+                curs_set(2);
+                mvwprintw(header, 0, 0, "Go to date [YYYY-MM-DD]: ");
+                if (wscanw(header, "%4i-%2i-%2i", &syear, &smonth, &sday) == 3) {
+                    // struct tm.tm_year: years since 1900
+                    new_date.tm_year = syear - 1900;
+                    // struct tm.tm_mon in range [0, 11]
+                    new_date.tm_mon = smonth - 1;
+                    new_date.tm_mday = sday;
+                    mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
+                }
+                curs_set(0);
+                break;
+            // today shortcut
+            case 't':
+                new_date = today;
+                mv_valid = go_to(cal, aside, raw_time, &pad_pos);
+                break;
+            // delete entry
+            case 'd':
+            case 'x':
+                if (date_has_entry(CONFIG.dir, diary_dir_size, &curs_date)) {
+                    // get file path of entry and delete entry
+                    fpath(CONFIG.dir, diary_dir_size, &curs_date, &ppth, sizeof pth);
+                    if (ppth == NULL) {
+                        fprintf(stderr, "Error retrieving file path for entry removal");
+                        break;
+                    }
+
+                    // prepare header for confirmation dialogue
+                    wclear(header);
+                    curs_set(2);
+                    noecho();
+
+                    // ask for confirmation
+                    strftime(dstr, sizeof dstr, CONFIG.fmt, &curs_date);
+                    mvwprintw(header, 0, 0, "Delete entry '%s'? [Y/n] ", dstr);
+                    bool conf = false;
+                    while (!conf) {
+                        conf_ch = wgetch(header);
+                        if (conf_ch == 'y' || conf_ch == 'Y' || conf_ch == '\n') {
+                            if (unlink(pth) != -1) {
+                                // file successfully deleted, remove entry highlight
+                                atrs = winch(cal) & A_ATTRIBUTES;
+                                wchgat(cal, 2, atrs & ~A_BOLD, 0, NULL);
+                                prefresh(cal, pad_pos, 0, 1, ASIDE_WIDTH,
+                                         LINES - 1, ASIDE_WIDTH + CAL_WIDTH);
+                            }
+                        } else if (conf_ch == 27 || conf_ch == 'n') {
+                            update_date(header, &curs_date);
+                        }
+                        break;
+                    }
+
+                    echo();
+                    curs_set(0);
+                }
+                break;
+            // edit/create a diary entry
+            case 'e':
+            case '\n':
+                if (pecmd == NULL) {
+                    fprintf(stderr, "Error retrieving edit command");
+                    break;
+                }
+                curs_set(1);
+                system(ecmd);
+                curs_set(0);
+                keypad(cal, TRUE);
+
+                // mark newly created entry
+                if (date_has_entry(CONFIG.dir, diary_dir_size, &curs_date)) {
+                    atrs = winch(cal) & A_ATTRIBUTES;
+                    wchgat(cal, 2, atrs | A_BOLD, 0, NULL);
+
+                    // refresh the calendar to add highlighting
+                    prefresh(cal, pad_pos, 0, 1, ASIDE_WIDTH,
+                             LINES - 1, ASIDE_WIDTH + CAL_WIDTH);
+                }
+                break;
+            // Move to the previous diary entry
+            case 'N':
+                new_date = find_closest_entry(new_date, true, CONFIG.dir, diary_dir_size);
+                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
+                break;
+            // Move to the next diary entry
+            case 'n':
+                new_date = find_closest_entry(new_date, false, CONFIG.dir, diary_dir_size);
+                mv_valid = go_to(cal, aside, mktime(&new_date), &pad_pos);
+                break;
+            // Sync entry with CalDAV server.
+            // Show confirmation dialogue before overwriting local files
+            case 's':
+                caldav_sync(&curs_date, header, cal, pad_pos, CONFIG.dir, diary_dir_size, true);
+                break;
+            // Sync all entries with CalDAV server;
+            case 'S':
+                for( ; it_time <= end_time; it_time = mktime(&it)) {
+                    if (conf_ch == -1) {
+                        // sync error
+                        break;
+                    } else if (conf_ch == 'c') {
+                        // cancel all
+                        break;
+                    } else if (conf_ch == 'a') {
+                        // yes to (a)ll
+                        conf_ch = caldav_sync(&it, header, cal, pad_pos, CONFIG.dir, diary_dir_size, false);
+                    } else {
+                        // show confirmation dialogue before overwriting local files
+                        conf_ch = caldav_sync(&it, header, cal, pad_pos, CONFIG.dir, diary_dir_size, true);
+                    }
+                    it.tm_mday++;
+                }
+                break;
+        }
+
+        if (mv_valid) {
+            update_date(header, &curs_date);
+
+            // adjust prev and header width (if terminal was resized in the mean time)
+            prev_width = COLS - ASIDE_WIDTH - CAL_WIDTH;
+            wresize(prev, prev_height, prev_width);
+            wresize(header, 1, prev_width);
+
+            // read the diary
+            display_entry(CONFIG.dir, diary_dir_size, &curs_date, prev, prev_width);
+        }
+    } while (ch != 'q');
+
+    endwin();
+    system("clear");
+    return 0;
+}
diff --git a/src/diary.h b/src/diary.h
@@ -0,0 +1,39 @@
+#ifndef DIARY_H
+#define DIARY_H
+
+
+#ifdef __MACH__
+	#include <CoreFoundation/CoreFoundation.h>
+#endif
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <string.h>
+#include <time.h>
+#include <errno.h>
+#include <dirent.h>
+#include <ncurses.h>
+#include <locale.h>
+#include <langinfo.h>
+#include "utils.h"
+#include "caldav.h"
+
+#define XDG_CONFIG_HOME_FALLBACK "~/.config"
+#define CONFIG_FILE_PATH "diary/diary.cfg"
+#define DIARY_VERSION "0.6-unstable"
+
+static const char* WEEKDAYS[] = {"Su","Mo","Tu","We","Th","Fr","Sa"};
+
+void setup_cal_timeframe();
+void draw_wdays(WINDOW* head);
+void draw_calendar(WINDOW* number_pad, WINDOW* month_pad, const char* diary_dir, size_t diary_dir_size);
+
+bool go_to(WINDOW* calendar, WINDOW* aside, time_t date, int* cur_pad_pos);
+void display_entry(const char* dir, size_t dir_size, const struct tm* date, WINDOW* win, int width);
+void edit_cmd(const char* dir, size_t dir_size, const struct tm* date, char** rcmd, size_t rcmd_size);
+
+bool date_has_entry(const char* dir, size_t dir_size, const struct tm* i);
+
+#endif
diff --git a/src/utils.c b/src/utils.c
@@ -0,0 +1,335 @@
+#include "utils.h"
+
+/* Update the header with the cursor date */
+void update_date(WINDOW* header, struct tm* curs_date) {
+    // TODO: dstr for strlen(CONFIG.format) > 16 ?
+    char dstr[16];
+    mktime(curs_date);
+    strftime(dstr, sizeof dstr, CONFIG.fmt, curs_date);
+
+    wclear(header);
+    mvwaddstr(header, 0, 0, dstr);
+    wrefresh(header);
+}
+
+
+char* extract_json_value(const char* json, char* key, bool quoted) {
+    // work on a copy of the json
+    char* jsoncp = (char*) malloc(strlen(json) * sizeof(char) + 1);
+    if (jsoncp == NULL) {
+        perror("malloc failed");
+        return NULL;
+    }
+    strcpy(jsoncp, json);
+
+    char* tok = strtok(jsoncp, " ");
+    while (tok != NULL) {
+        if (strstr(tok, key) != NULL) {
+            tok = strtok(NULL, " "); // value
+            break;
+        }
+        // key was not in this tok, advance tok
+        tok = strtok(NULL, " ");
+    }
+
+    // remove quotes and comma or commma only
+    if (quoted) {
+        tok = strtok(tok, "\"");
+    } else {
+        tok = strtok(tok, ",");
+    }
+
+    char* res = NULL;
+    if (tok != NULL) {
+        res = (char*) malloc(strlen(tok) * sizeof(char) + 1);
+        if (res == NULL) {
+            perror("malloc failed");
+            return NULL;
+        }
+        strcpy(res, tok);
+    }
+
+    free(jsoncp);
+    return res;
+}
+
+char* fold(const char* str) {
+    // work on a copy of the str
+    char* strcp = (char *) malloc(strlen(str) * sizeof(char) + 1);
+    if (strcp == NULL) {
+        perror("malloc failed");
+        return NULL;
+    }
+    strcpy(strcp, str);
+
+    // create buffer for escaped result TEXT
+    char* buf = malloc(1);
+    if (buf == NULL) {
+        perror("malloc failed");
+        return NULL;
+    }
+    buf[0] = '\0';
+
+    void* newbuf;
+    // bufl is the current buffer size incl. \0
+    int bufl = 1;
+    // i is the iterator in strcp
+    char* i = strcp;
+    // escch is the char to be escaped,
+    // only written when esc=true
+    char escch;
+    bool esc = false;
+
+    while(*i != '\0' || esc) {
+        fprintf(stderr, "strlen(buf): %i\n", bufl);
+        fprintf(stderr, "*i: %c\n", *i);
+        fprintf(stderr, "escch: %c\n", escch);
+        fprintf(stderr, "esc: %i\n", esc);
+        fprintf(stderr, "buffer: %s\n\n", buf);
+
+        newbuf = realloc(buf, ++bufl);
+        if (newbuf == NULL) {
+            perror("realloc failed");
+            free(buf);
+            return NULL;
+        }
+        buf = (char*) newbuf;
+
+        if ((bufl > 1) && ((bufl % 77) == 0)) {
+            // break lines after 75 chars
+            // split between any two characters by inserting a CRLF
+            // immediately followed by a white space character
+            buf[bufl-2] = '\n';
+            escch = ' ';
+            esc = true;
+            continue;
+        }
+
+        if (esc) {
+            // only escape char, do not advance iterator i
+            buf[bufl-2] = escch;
+            esc = false;
+        } else {
+            // escape characters
+            // https://datatracker.ietf.org/doc/html/rfc5545#section-3.3.11
+            switch (*i) {
+                case 0x5c: // backslash
+                    buf[bufl-2] = 0x5c;
+                    escch = 0x5c;
+                    esc = true;
+                    break;
+                case ';':
+                    buf[bufl-2] = 0x5c;
+                    escch = ';';
+                    esc = true;
+                    break;
+                case ',':
+                    buf[bufl-2] = 0x5c;
+                    escch = ',';
+                    esc = true;
+                    break;
+                case '\n':
+                    buf[bufl-2] = 0x5c;
+                    escch = 'n';
+                    esc = true;
+                    break;
+                default:
+                    // write regular character from strcp
+                    buf[bufl-2] = *i;
+                    break;
+            }
+            i++;
+        }
+
+        // terminate the char string in any case (esc or not)
+        buf[bufl-1] = '\0';
+    }
+
+    fprintf(stderr, "escch: %c\n", escch);
+    fprintf(stderr, "end: %c\n", buf[bufl]);
+
+    free(strcp);
+    return buf;
+}
+
+char* unfold(const char* str) {
+    fprintf(stderr, "Before unfolding: %s\n", str);
+    //if (strcmp(str, "")) {
+    //    fputs("Unfold string is empty.\n", stderr);
+    //    return NULL;
+    //}
+
+    // work on a copy of the str
+    char* strcp = (char *) malloc(strlen(str) * sizeof(char) + 1);
+    if (strcp == NULL) {
+        perror("malloc failed");
+        return NULL;
+    }
+    strcpy(strcp, str);
+
+    char* res = strtok(strcp, "\n");
+
+    char* buf = malloc(strlen(res) + 1);
+    if (buf == NULL) {
+        perror("malloc failed");
+        return NULL;
+    }
+    strcpy(buf, res);
+
+    char* newbuf;
+    regex_t re;
+    regmatch_t pm[1];
+
+    if (regcomp(&re, "^[^ \t]", 0) != 0) {
+        perror("Failed to compile regex");
+        return NULL;
+    }
+
+    while (res != NULL) {
+        res = strtok(NULL, "\n");
+
+        if (regexec(&re, res, 1, pm, 0) == 0) {
+            // Stop unfolding if line does not start with white space/tab:
+            // https://datatracker.ietf.org/doc/html/rfc2445#section-4.1
+            break;
+        }
+
+        newbuf = realloc(buf, strlen(buf) + strlen(res) + 1);
+        if (buf == NULL) {
+            perror("realloc failed");
+            free(buf);
+            return NULL;
+        } else {
+            buf = newbuf;
+            strcat(buf, res + 1);
+        }
+    }
+
+    regfree(&re);
+    free(strcp);
+    return buf;
+}
+
+char* extract_ical_field(const char* ics, char* key, bool multiline) {
+    regex_t re;
+    regmatch_t pm[1];
+    char key_regex[strlen(key) + 1];
+    sprintf(key_regex, "^%s", key);
+    fprintf(stderr, "Key regex: %s\n", key_regex);
+
+    if (regcomp(&re, key_regex, 0) != 0) {
+        perror("Failed to compile regex");
+        return NULL;
+    }
+
+    // work on a copy of the ical xml response
+    char* icscp = (char *) malloc(strlen(ics) * sizeof(char) + 1);
+    if (icscp == NULL) {
+        perror("malloc failed");
+        return NULL;
+    }
+    strcpy(icscp, ics);
+
+    // tokenize ical by newlines
+    char* res = strtok(icscp, "\n");
+
+    while (res != NULL) {
+        if (regexec(&re, res, 1, pm, 0) == 0) {
+            res = strstr(res, ":"); // value
+            res++; // strip the ":"
+
+            fprintf(stderr, "Extracted ical result value: %s\n", res);
+            fprintf(stderr, "Extracted ical result size: %li\n", strlen(res));
+
+            if (strlen(res) == 0) {
+                // empty remote description
+                res = NULL;
+            } else if (multiline) {
+                res = unfold(ics + (res - icscp));
+            }
+            break;
+        }
+        // key not in this line, advance line
+        res = strtok(NULL, "\n");
+    }
+    fprintf(stderr, "Sizeof ics: %li\n", strlen(ics));
+
+    free(icscp);
+    return res;
+}
+
+// Return expanded file path
+char* expand_path(const char* str) {
+    char* res;
+    wordexp_t str_wordexp;
+    if ( wordexp( str, &str_wordexp, 0 ) == 0) {
+        res = (char *) calloc(strlen(str_wordexp.we_wordv[0]) + 1, sizeof(char));
+        strcpy(res, str_wordexp.we_wordv[0]);
+    }
+    wordfree(&str_wordexp);
+    return res;
+}
+
+// Get last occurence of string in string
+// https://stackoverflow.com/questions/20213799/finding-last-occurence-of-string
+char* strrstr(char *haystack, char *needle) {
+    int nlen = strlen(needle);
+    for (char* i = haystack + strlen(haystack) - nlen; i >= haystack; i--) {
+        if (strncmp(i, needle, nlen) == 0) {
+            return i;
+        }
+    }
+    return NULL;
+}
+
+/* Writes file path for 'date' entry to 'rpath'. '*rpath' is NULL on error. */
+void fpath(const char* dir, size_t dir_size, const struct tm* date, char** rpath, size_t rpath_size)
+{
+    // check size of result path
+    if (dir_size + 1 > rpath_size) {
+        fprintf(stderr, "Directory path too long");
+        *rpath = NULL;
+        return;
+    }
+
+    // add path of the diary dir to result path
+    strcpy(*rpath, dir);
+
+    // check for terminating '/' in path
+    if (dir[dir_size - 1] != '/') {
+        // check size again to accommodate '/'
+        if (dir_size + 1 > rpath_size) {
+            fprintf(stderr, "Directory path too long");
+            *rpath = NULL;
+            return;
+        }
+        strcat(*rpath, "/");
+    }
+
+    char dstr[16];
+    strftime(dstr, sizeof dstr, CONFIG.fmt, date);
+
+    // append date to the result path
+    if (strlen(*rpath) + strlen(dstr) > rpath_size) {
+        fprintf(stderr, "File path too long");
+        *rpath = NULL;
+        return;
+    }
+    strcat(*rpath, dstr);
+}
+
+// TODO: write functions for (un)escaped TEXT
+// https://datatracker.ietf.org/doc/html/rfc5545#section-3.3.11
+char* unescape_ical_description(const char* description);
+char* escape_ical_description(const char* description);
+
+config CONFIG = {
+    .range = 1,
+    .weekday = 1,
+    .fmt = "%Y-%m-%d",
+    .editor = "",
+    .google_tokenfile = GOOGLE_OAUTH_TOKEN_FILE,
+    .google_clientid = GOOGLE_OAUTH_CLIENT_ID,
+    .google_secretid = GOOGLE_OAUTH_CLIENT_SECRET,
+    .google_calendar = ""
+};
diff --git a/src/utils.h b/src/utils.h
@@ -0,0 +1,58 @@
+#ifndef DIARY_UTILS_H
+#define DIARY_UTILS_H
+
+#include <regex.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <wordexp.h>
+#include <stdbool.h>
+#include <ncurses.h>
+
+#define GOOGLE_OAUTH_TOKEN_FILE "~/.diary-token"
+#ifndef GOOGLE_OAUTH_CLIENT_ID
+    #define GOOGLE_OAUTH_CLIENT_ID ""
+#endif
+#ifndef GOOGLE_OAUTH_CLIENT_SECRET
+    #define GOOGLE_OAUTH_CLIENT_SECRET ""
+#endif
+
+#define CAL_WIDTH 21
+#define ASIDE_WIDTH 4
+#define MAX_MONTH_HEIGHT 6
+
+void update_date(WINDOW* header, struct tm* curs_date);
+char* extract_json_value(const char* json, char* key, bool quoted);
+char* fold(const char* str);
+char* unfold(const char* str);
+char* extract_ical_field(const char* ical, char* key, bool multline);
+char* expand_path(const char* str);
+char* strrstr(char *haystack, char *needle);
+void fpath(const char* dir, size_t dir_size, const struct tm* date, char** rpath, size_t rpath_size);
+
+typedef struct
+{
+    // Path that holds the journal text files
+    char* dir;
+    // Number of years to show before/after todays date
+    int range;
+    // 7 = Sunday, 1 = Monday, ..., 6 = Saturday
+    int weekday;
+    // 2020-12-31
+    char* fmt;
+    // Editor to open journal files with
+    char* editor;
+    // File for Google OAuth access token
+    char* google_tokenfile;
+    // Google client id
+    char* google_clientid;
+    // Google secret id
+    char* google_secretid;
+    // Google calendar to synchronize
+    char* google_calendar;
+} config;
+
+config CONFIG;
+
+#endif