calcurse: sync with Google Calendar via calcurse-caldav

Hourly timer started from xmonad, plus UI hooks that sync before load and after exit. calcurse-sync notifies once when the OAuth login expires and restarts the daemon after imports, since it never re-reads its files.

.config/calcurse/hooks/post-save

@@ -0,0 +1,6 @@
+#!/bin/sh
+# Sync the UI's saved changes once it exits (syncing while it runs would change files under it).
+[ "$(ps -o args= -p "$PPID")" = calcurse ] && [ "$(ps -o tty= -p "$PPID" | tr -d ' ')" != '?' ] || exit 0
+# shellcheck disable=SC2016 # $1 expands in the inner shell
+setsid -f sh -c 'while kill -0 "$1" 2>/dev/null; do sleep 1; done; systemctl --user start calcurse-sync.service' \
+    sh "$PPID" >/dev/null 2>&1

.config/calcurse/hooks/pre-load

@@ -0,0 +1,5 @@
+#!/bin/sh
+# Sync with Google before the UI loads. Non-interactive calls (-Q, -d, -i, calcurse-caldav's own) run this hook
+# too, so act only for the UI: a bare "calcurse" with a terminal (the daemon is bare too, but has none).
+[ "$(ps -o args= -p "$PPID")" = calcurse ] && [ "$(ps -o tty= -p "$PPID" | tr -d ' ')" != '?' ] || exit 0
+calcurse-sync --now 2>&1 | systemd-cat -t calcurse-sync

.config/systemd/user/calcurse-sync.service

@@ -0,0 +1,6 @@
+[Unit]
+Description=Sync calcurse with Google Calendar
+
+[Service]
+Type=oneshot
+ExecStart=%h/.local/bin/calcurse-sync

.config/systemd/user/calcurse-sync.timer

@@ -0,0 +1,7 @@
+[Unit]
+Description=Sync calcurse with Google Calendar hourly
+
+[Timer]
+OnActiveSec=1min
+OnCalendar=hourly
+Persistent=true

.config/systemd/user/calcurse-today.service

@@ -1,5 +1,6 @@
 [Unit]
 Description=Notify today's calcurse events
+After=calcurse-sync.service
 
 [Service]
 Type=oneshot

.config/xmonad/xmonad.hs

@@ -359,6 +359,7 @@ myStartupHook = do
   spawnOnce "arch-audit-gtk"
   spawnOnce "calcurse --daemon"
   spawnOnce "systemctl --user start calcurse-today.timer"
+  spawnOnce "systemctl --user start calcurse-sync.timer"
   spawnOnce "systemctl --user start dunst"
   spawnOnce "lxpolkit"
   spawnOnce "numlockx"