added git:src:install task and more 'how to develop new tasks' info i…

…n README

README.markdown

@@ -56,6 +56,23 @@ So, to create a task `foo:bar:baz`, you'll need to add a folder `foo/bar` and cr
 	  end
 	end
 
+### Installing individual tasks/files
+
+The `rake install` task can selectively install only tasks/files that you are working on, rather than all the files in your repository, using either the `ONLY_FILES` or `ONLY_TASKS` environment variable.
+
+For example, to restrict `rake install` to only re-install a task `foo:bar:baz` you can either use:
+
+	rake install ONLY_FILES=foo/bar/baz.sake
+	rake install ONLY_TASKS=foo:bar:baz
+
+The values can be comma-separated lists.
+
+So for iterative install & run development you could run the install task and the sake task via the same command line:
+
+	rake install ONLY_TASKS=foo:bar:baz && sake foo:bar:baz --trace
+
+The optional `--trace` runs sake in trace mode so useful stacktrace information is given as necessary.
+
 ### TextMate users
 
 The latest [Ruby.tmbundle](http://github.com/drnic/ruby-tmbundle) on github includes a `task` command that generates the above namespace/task snippet based on the path + file name. That is, inside the `foo/bar/baz.sake` file, make sure your grammar is 'Ruby' or 'Ruby on Rails' and then type "task" and press TAB. The above snippet will be generated ready for you to specify your task.

Rakefile

@@ -1,9 +1,13 @@
-desc "Install sake tasks, uninstalling any pre-existing tasks first"
+desc "Install sake tasks, uninstalling any pre-existing tasks first; can pass ONLY_FILES and ONLY_TASKS env vars"
 task :install do
   task_files = Dir['**/*.sake']
+  only_files = ENV['ONLY_FILES'] && ENV['ONLY_FILES'].split(',')
+  only_tasks = ENV['ONLY_TASKS'] && ENV['ONLY_TASKS'].split(',')
   task_files.sort.map do |task_file|
+    next if only_files && !only_files.include?(task_file)
     sake_task = task_file.gsub('/', ':').gsub('.sake','')
-    puts `sake -u #{sake_task}`
+    next if only_tasks && !only_tasks.include?(sake_task)
+    `sake -u #{sake_task}`
     puts `sake -i #{task_file}`
   end
 end

git/src/install.sake

@@ -0,0 +1,37 @@
+namespace 'git' do
+  namespace 'src' do
+    desc "Downloads and installs latest version of git"
+    task :install        => "git:src:latest_version" do
+      download_url       = ENV['GIT_DOWNLOAD_URL']
+      git_package        = File.basename(download_url)
+      git_src_folder     = git_package.gsub(/.tar.gz/, '')
+      target_base_folder = '/usr/local'
+      usr_src_folder     = File.join(target_base_folder, 'src')
+      require "fileutils"
+      FileUtils.mkdir_p usr_src_folder
+      FileUtils.chdir usr_src_folder do
+        if File.exists?(git_package)
+          puts "File #{git_package} already downloaded, skipping download..."
+        else
+          `wget #{download_url}`
+        end
+
+        if File.exists?(git_src_folder)
+          puts "Removing existing #{git_src_folder} source"
+          FileUtils.rm_rf git_src_folder
+        end
+
+        puts "Unpacking #{git_src_folder}"
+        `tar xfv #{git_package}`
+
+        FileUtils.chdir git_src_folder do
+          puts "Installing to #{target_base_folder}"
+          sh "make prefix=#{target_base_folder} all"
+          sh "sudo make prefix=#{target_base_folder} install all"
+        end
+      end
+
+      puts "Run 'sake git:manpages:install' to install manpages for #{`git --version`}"
+    end
+  end
+end

git/src/latest_version.sake

@@ -0,0 +1,21 @@
+namespace 'git' do
+  namespace 'src' do
+    task :latest_version do
+      require "rubygems"
+      begin
+        gem 'hpricot'
+        require 'hpricot'
+      rescue LoadError
+        puts "REQUIREMENT: Hpricot"
+        puts "Installation: sudo gem install hpricot"
+        exit
+      end
+      require "open-uri"
+      doc = open('http://git.or.cz/').read
+      if download_url = doc.match(%r{http://kernel.org/pub/software/scm/git/git-([\d.]+).tar.gz})
+        ENV['GIT_DOWNLOAD_URL'] = download_url[0]
+        puts "Current git src version: #{$1}"
+      end
+    end
+  end
+end