From af1eb007e2cb251692fed609b517e6aba987119d Mon Sep 17 00:00:00 2001
From: Xu Cheng <xucheng@me.com>
Date: Mon, 11 Apr 2016 21:47:08 +0800
Subject: [PATCH] help: handle alias

Before this fix
```
$ brew --help ls
Error: Unknown command: ls
```

After this fix
```
$ brew --help ls
brew list, ls
<snip>
```
---
 Library/Homebrew/cmd/help.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Library/Homebrew/cmd/help.rb b/Library/Homebrew/cmd/help.rb
index 76eef90a8f..449d44d466 100644
--- a/Library/Homebrew/cmd/help.rb
+++ b/Library/Homebrew/cmd/help.rb
@@ -41,6 +41,7 @@ module Homebrew
   end
 
   def help_for_command(cmd)
+    cmd = HOMEBREW_INTERNAL_COMMAND_ALIASES.fetch(cmd, cmd)
     cmd_path = if File.exist?(HOMEBREW_LIBRARY_PATH/"cmd/#{cmd}.sh")
       HOMEBREW_LIBRARY_PATH/"cmd/#{cmd}.sh"
     elsif ARGV.homebrew_developer? && File.exist?(HOMEBREW_LIBRARY_PATH/"dev-cmd/#{cmd}.sh")