taskwarrior: Add auto-syncing script

Let taskwarrior automatically sync any changed tasks whenever a process
is completed.
Will sync 'asynchronously' (start the job as a terminal background
process) and show the sync message after it is done.

taskwarrior/.local/share/task/hooks/on-exit.sync-to-server.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env sh
+# This hooks script syncs task warrior to the configured task server.
+# The on-exit event is triggered once, after all processing is complete.
+
+# Make sure hooks are enabled
+
+# Count the number of tasks modified
+n=0
+while read -r REPLY; do
+    n=$((n + 1))
+done
+
+if [ $n -gt 0 ]; then
+    SAVELOC="${XDG_DATA_HOME}/task"
+    task sync >>"${SAVELOC:-~/.task}/sync_hook.log" &
+fi