bin/wakey.zsh: Don't do anything if there's no X display, or `notify-send'.

diff --git a/bin/wakey.zsh b/bin/wakey.zsh
index 41ccafd9561367475617840ca2c15575e6d220bf..94638caa84ebad8518ae2e252fb17671bc1fb99d 100644 (file)
--- a/bin/wakey.zsh
+++ b/bin/wakey.zsh
@@ -40,5 +40,12 @@ __wakey_precmd () {
   esac
 }
 
-preexec_functions+=(__wakey_preexec)
-precmd_functions+=(__wakey_precmd)
+case ${DISPLAY-nil} in
+  nil) ;;
+  *)
+    if whence notify-send >/dev/null 2>&1; then
+      preexec_functions+=(__wakey_preexec)
+      precmd_functions+=(__wakey_precmd)
+    fi
+    ;;
+esac