gearma: add LaunchAgent plist

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

wip

Formula/gearman.rb

@@ -11,5 +11,45 @@ class Gearman < Formula
   def install
     system "./configure", "--prefix=#{prefix}"
     system "make install"
+
+    plist_path.write startup_plist
+    plist_path.chmod 0644
+  end
+
+  def caveats
+    <<-EOS.undent
+    If this is your first install, automatically load on login with:
+        mkdir -p ~/Library/LaunchAgents
+        cp #{plist_path} ~/Library/LaunchAgents/
+        launchctl load -w ~/Library/LaunchAgents/#{plist_path.basename}
+
+    If this is an upgrade and you already have the #{plist_path} loaded:
+        launchctl unload -w ~/Library/LaunchAgents/#{plist_path.basename}
+        cp #{plist_path} ~/Library/LaunchAgents/
+        launchctl load -w ~/Library/LaunchAgents/#{plist_path.basename}
+
+      To start gearmand manually:
+        gearmand -d
+    EOS
+  end
+
+  def startup_plist
+    return <<-EOPLIST
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN"
+"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+  <dict>
+    <key>Label</key>
+    <string>#{plist_name}</string>
+    <key>Program</key>
+    <string>#{sbin}/gearmand</string>
+    <key>RunAtLoad</key>
+    <true/>
+    <key>UserName</key>
+    <string>#{`whoami`.chomp}</string>
+  </dict>
+</plist>
+    EOPLIST
   end
 end