Add bgnotify plugin, a cross-platform background notifier!

plugins/bgnotify/bgnotify.plugin.zsh

@@ -0,0 +1,65 @@
+#!/usr/bin/env zsh
+
+
+## setup ##
+
+[[ -o interactive ]] || return #interactive only!
+zmodload zsh/datetime || { print "can't load zsh/datetime"; return } # faster than date()
+autoload -Uz add-zsh-hook || { print "can't add zsh hook!"; return }
+
+(( ${+bgnotify_threshold} )) || bgnotify_threshold=5 #default 10 seconds
+
+
+## definitions ##
+
+if ! (type notify_formatted | grep -q 'function'); then
+  echo "using default notify_formatted"
+  function bgnotify_formatted {
+    ## exit_status, command, elapsed_time
+    [ $1 -eq 0 ] && title="#win (took $3 s)" || title="#fail (took $3 s)"
+    bgnotify "$title" "$2"
+  }
+fi
+
+currentWindowId () {
+  if hash notify-send 2>/dev/null; then #ubuntu!
+    xprop -root | awk '/NET_ACTIVE_WINDOW/ { print $5; exit }'
+  elif hash osascript 2>/dev/null; then #osx
+    osascript -e 'tell application (path to frontmost application as text) to id of front window' 2&> /dev/null
+  fi
+}
+
+bgnotify () {
+  if hash notify-send 2>/dev/null; then #ubuntu!
+    notify-send $1 $2
+  elif hash terminal-notifier 2>/dev/null; then #osx
+    terminal-notifier -message $2 -title $1
+  elif hash growlnotify 2>/dev/null; then #osx growl
+    growlnotify -m $1 $2
+  fi
+}
+
+
+## Zsh hooks ##
+
+bgnotify_begin() {
+  bgnotify_timestamp=$EPOCHSECONDS
+  bgnotify_lastcmd=$1
+  bgnotify_windowid=$(currentWindowId)
+}
+
+bgnotify_end() {
+  didexit=$?
+  elapsed=$(( $EPOCHSECONDS - $bgnotify_timestamp ))
+  past_threshold=$(( $elapsed >= $bgnotify_threshold ))
+  if (( bgnotify_timestamp > 0 )) && (( past_threshold )); then
+    if [ $(currentWindowId) != "$bgnotify_windowid" ]; then
+      print -n "\a"
+      bgnotify_formatted "$didexit" "$bgnotify_lastcmd" "$elapsed"
+    fi
+  fi
+  bgnotify_timestamp=0 #reset it to 0!
+}
+
+add-zsh-hook preexec bgnotify_begin
+add-zsh-hook precmd bgnotify_end