zsh: update

.config/zsh/lib/systemd.zsh

@@ -0,0 +1,18 @@
+#!/bin/zsh
+
+z-systemctl() {
+    command systemctl --quiet --no-pager --lines=0 --no-ask-password "$@"
+}
+
+z-systemctl-status-rc() {
+    z-systemctl status "$@" >/dev/null 2>&1
+}
+
+z-systemctl-exists() {
+    z-systemctl-status-rc "$@"
+    case "$?" in
+    0 | 1 | 3 ) return 0 ;;
+    ## also 4 = "no such unit"
+    * ) return 1 ;;
+    esac
+}