Add a Rake task to generate a standalone script

Even though the code is easier to manage and test as something like a
Ruby project, it's harder to install and use.  The rake task added
`rake bundle` will output an executable, standalone script called
git-rank in the project root.

The README install instructions have also been updated to give this as
an options, and provide better documentation to the other installation
options.

README.md

@@ -7,13 +7,25 @@ files and filtering lines by regex.
 
 # Installation
 
-For now copy or symlink the git-rank file to somewhere in your path and add
-git-rank/lib to your RUBYLIB to run from source.
+The easiest way to install is to generate the standalone script and copy to
+somewhere in your PATH like ~/bin.
 
-Or you can build it as a gem yourself.  This is probably not recommended unless you're happy with the current functionality or are uncomfortable with modifying your PATH and RUBYLIB.  I'm not sure that shipping this as a gem is the right way to distribute it long term, as I'm guessing there may be a better way to add commands to git.  If you want the gem:
+    rake bundle &> /dev/null && cp git-rank $HOME/bin
 
-    gem build git-rank.gemspec
-    gem install git-rank-0.0.1.gem
+If you would like to run from source to make updates from git easier, symlink
+the bin/git-rank file to somewhere in your path and add git-rank/lib to your
+RUBYLIB to run from source.  This way if you update this repo, no further
+action is required to run the new code.
+
+    ln -s `pwd`/bin/git-rank $HOME/bin/git-rank && export RUBYLIB=`pwd`/lib:$RUBYLIB
+
+Or you can build it as a gem yourself.  This is probably not recommended unless
+you're happy with the current functionality or are uncomfortable with modifying
+your PATH and RUBYLIB.  I'm not sure that shipping this as a gem is the right
+way to distribute it long term, as I'm guessing there may be a better way to
+add commands to git.  If you want the gem:
+
+    gem build git-rank.gemspec && gem install git-rank-0.0.1.gem
 
 # Usage
 

Rakefile

@@ -0,0 +1,25 @@
+require 'rake'
+
+desc "Bundle all the code into a single script"
+
+task :bundle do
+  require 'find'
+
+  git_rank = File.open('git-rank', 'w')
+  git_rank.puts "#!/usr/bin/env ruby"
+
+  Find.find('lib', 'bin') do |file|
+    next unless FileTest.file? file
+    File.read(file).each_line do |line|
+      next if line =~ /^require.*git-rank/
+      next if line =~ /^#!/
+      git_rank.puts line
+    end
+  end
+
+  File.chmod(0755, git_rank.path)
+  git_rank.close
+  puts "git-rank created"
+  puts "This file be run as a script"
+  puts "Add it somewhere in your PATH for easy execution"
+end

lib/git-rank.rb

@@ -1,9 +1,5 @@
 #!/usr/bin/env ruby
 
-require 'optparse'
-require 'fileutils'
-require 'yaml'
-require 'digest/md5'
 require 'git-rank/log'
 require 'git-rank/blame'
 
@@ -23,14 +19,13 @@ def sum
 
 module GitRank
   class << self
-  def calculate(options = {})
-    authors = if options[:blame]
-      GitRank::Blame.calculate(options)
-    else
-      GitRank::Log.calculate(options)
+    def calculate(options = {})
+      authors = if options[:blame]
+        GitRank::Blame.calculate(options)
+      else
+        GitRank::Log.calculate(options)
+      end
+      authors
     end
-    authors
-  end
-
   end
 end

lib/git-rank/blame.rb

@@ -1,3 +1,5 @@
+require 'digest/md5'
+
 module GitRank
   module Blame
     class << self

lib/git-rank/cache.rb

@@ -1,3 +1,6 @@
+require 'yaml'
+require 'fileutils'
+
 module GitRank
   module Cache
     class << self

lib/git-rank/log.rb

@@ -1,36 +1,38 @@
+require 'digest/md5'
+
 module GitRank
-module Log
-  class << self
-    def calculate(options = {})
-      authors = Hash.new {|h, k| h[k] = h[k] = Hash.new(0)}
-      options_digest = Digest::MD5.hexdigest(options[:additions_only].to_s + options[:deletions_only].to_s)
+  module Log
+    class << self
+      def calculate(options = {})
+        authors = Hash.new {|h, k| h[k] = h[k] = Hash.new(0)}
+        options_digest = Digest::MD5.hexdigest(options[:additions_only].to_s + options[:deletions_only].to_s)
 
-      author = nil
-      file = nil
-      state = :pre_author
-      git_log.each do |line|
-        case
-        when (state == :pre_author || state == :post_author) && line =~ /Author: (.*)\s</
-          author = $1
-          state = :post_author
-        when line =~ /^(\d+)\s+(\d+)\s+(.*)/
-          additions = $1.to_i
-          deletions = $2.to_i
-          file = $3
-          authors[author][file] += (additions + deletions)
-          state = :in_diff
-        when state == :in_diff && line =~ /^commit /
-          state = :pre_author
+        author = nil
+        file = nil
+        state = :pre_author
+        git_log.each do |line|
+          case
+          when (state == :pre_author || state == :post_author) && line =~ /Author: (.*)\s</
+            author = $1
+            state = :post_author
+          when line =~ /^(\d+)\s+(\d+)\s+(.*)/
+            additions = $1.to_i
+            deletions = $2.to_i
+            file = $3
+            authors[author][file] += (additions + deletions)
+            state = :in_diff
+          when state == :in_diff && line =~ /^commit /
+            state = :pre_author
+          end
         end
+        authors
       end
-      authors
-    end
 
-    private
+      private
 
-    def git_log
-      `git log -M -C -C -w --no-color --numstat`
+      def git_log
+        `git log -M -C -C -w --no-color --numstat`
+      end
     end
   end
 end
-end

lib/git-rank/options.rb

@@ -1,3 +1,5 @@
+require 'optparse'
+
 module GitRank::Options
   def self.parse
     options = {}