Make script/plugin install <plugin> -r <revision> option work with git based...

Make script/plugin install <plugin> -r <revision> option work with git based plugins. [#257 state:resolved]
Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

railties/CHANGELOG

 *Edge*
 
+* Make script/plugin install <plugin> -r <revision> option work with git based plugins. #257. [Tim Pope Jakub Kuźma]. Example:
+
+  script/plugin install git://github.com/mislav/will_paginate.git -r agnostic # Installs 'agnostic' branch
+  script/plugin install git://github.com/dchelimsky/rspec.git -r 'tag 1.1.4'
+
 * Added Rails.initialized? flag [Josh Peek]
 
 * Make rake test:uncommitted work with Git. [Tim Pope]

railties/lib/commands/plugin.rb

@@ -43,6 +43,16 @@
 #     plugin is pulled via `svn checkout` or `svn export` but looks
 #     exactly the same.
 # 
+# Specifying revisions:
+#
+#   * Subversion revision is a single integer.
+#
+#   * Git revision format:
+#     - full - 'refs/tags/1.8.0' or 'refs/heads/experimental'
+#     - short: 'experimental' (equivalent to 'refs/heads/experimental')
+#              'tag 1.8.0' (equivalent to 'refs/tags/1.8.0')
+#
+#
 # This is Free Software, copyright 2005 by Ryan Tomayko (rtomayko@gmail.com) 
 # and is licensed MIT: (http://www.opensource.org/licenses/mit-license.php)
 
@@ -175,7 +185,7 @@ def install(method=nil, options = {})
     method ||= rails_env.best_install_method?
     if :http == method
       method = :export if svn_url?
-      method = :clone  if git_url?
+      method = :git    if git_url?
     end
 
     uninstall if installed? and options[:force]
@@ -255,8 +265,25 @@ def install_using_http(options = {})
       end
     end
     
-    def install_using_clone(options = {})
-      git_command :clone, options
+    def install_using_git(options = {})
+      root = rails_env.root
+      install_path = mkdir_p "#{root}/vendor/plugins/#{name}"
+      Dir.chdir install_path do
+        init_cmd = "git init"
+        init_cmd += " -q" if options[:quiet] and not $verbose
+        puts init_cmd if $verbose
+        system(init_cmd)
+        base_cmd = "git pull --depth 1 #{uri}"
+        base_cmd += " -q" if options[:quiet] and not $verbose
+        base_cmd += " #{options[:revision]}" if options[:revision]
+        puts base_cmd if $verbose
+        if system(base_cmd)
+          puts "removing: .git" if $verbose
+          rm_rf ".git"
+        else
+          rm_rf install_path
+        end
+      end
     end
 
     def svn_command(cmd, options = {})
@@ -268,16 +295,6 @@ def svn_command(cmd, options = {})
       puts base_cmd if $verbose
       system(base_cmd)
     end
-    
-    def git_command(cmd, options = {})
-      root = rails_env.root
-      mkdir_p "#{root}/vendor/plugins"
-      base_cmd = "git #{cmd} --depth 1 #{uri} \"#{root}/vendor/plugins/#{name}\""
-      puts base_cmd if $verbose
-      puts "removing: #{root}/vendor/plugins/#{name}/.git"
-      system(base_cmd)
-      rm_rf "#{root}/vendor/plugins/#{name}/.git"
-    end
 
     def guess_name(url)
       @name = File.basename(url)
@@ -756,8 +773,8 @@ def options
                       "Suppresses the output from installation.",
                       "Ignored if -v is passed (./script/plugin -v install ...)") { |v| @options[:quiet] = true }
         o.on(         "-r REVISION", "--revision REVISION",
-                      "Checks out the given revision from subversion.",
-                      "Ignored if subversion is not used.") { |v| @options[:revision] = v }
+                      "Checks out the given revision from subversion or git.",
+                      "Ignored if subversion/git is not used.") { |v| @options[:revision] = v }
         o.on(         "-f", "--force",
                       "Reinstalls a plugin if it's already installed.") { |v| @options[:force] = true }
         o.separator   ""