task: Add git-sync script hook

Synchronizes a git repository for the taskwarrior data directory,
automatically committing any changes after each command; and pushing and
pulling on syncing taskwarrior.

office/.local/share/task/hooks/on-exit.git-sync

@@ -0,0 +1,39 @@
+#!/bin/sh
+# Automatically git commits, pushes and pulls if doable in the taskwarrior data directory
+#
+# Much of this taken from: https://github.com/mrschyte/taskwarrior-hooks/
+# with much gratitude
+
+if [ "${DISABLE_HOOKS}" = "true" ] || ! command -v git >/dev/null 2>&1; then
+    exit 0;
+fi
+
+if [ "$1" != "api:2" ]; then
+    printf "Taskwarrior uses different data API version than git plugin. Aborting!" 1>&2
+    exit 1
+fi
+
+data_dir="$(echo "$5" | cut -f2 -d:)"
+command_run="$(echo "$3" | cut -f2 -d:)"
+
+# after any command, if there's changes add and commit
+if ! git -C "$data_dir" diff --exit-code >/dev/null 2>&1; then
+    # need to run to fully update tasks that just got done
+    DISABLE_HOOKS=true env task next >/dev/null 2>&1
+
+    header="auto: ${2##* }"
+    msg="full command: $2"
+    git -C "$data_dir" commit -a -m "$header" -m "$msg" --no-gpg-sign >/dev/null 2>&1
+fi
+
+if [ "$command_run" = "synchronize" ]; then
+    DISABLE_HOOKS=true env task sync
+
+    git -C "$data_dir" pull >/dev/null 2>&1
+    pull_ret="$?"
+    git -C "$data_dir" push >/dev/null 2>&1
+    push_ret="$?"
+    if [ "$pull_ret" -eq 0 ] && [ "$push_ret" -eq 0 ]; then
+        echo Git upstream synchronized.
+    fi
+fi