Check Git version before copying local config

.gitconfig

@@ -24,10 +24,10 @@
 	excludesfile = ~/.cvsignore
 	editor = vim
 	whitespace = warn
-[github]
-	user = hashrocketeer
 [help]
 	autocorrect = 10
+[include]
+	path = ~/.gitconfig.local
 [interactive]
 	singlekey = true
 [merge]
@@ -52,8 +52,3 @@
 	default = tracking
 [rebase]
 	autosquash = true
-[user]
-	email = dev@hashrocket.com
-	name = "Hashrocket Workstation"
-[include]
-	path = .gitconfig.local

.gitconfig.local

@@ -0,0 +1,5 @@
+[github]
+	user = hashrocketeer
+[user]
+	email = dev@hashrocket.com
+	name = "Hashrocket Workstation"

bin/git_configuration_handler.rb

@@ -0,0 +1,44 @@
+class GitConfigurationHandler
+
+  LocalGitConfigCopiedMessage = "\nGeneric Hashrocket Git credentials \
+have been configured in ~/.gitconfig.local.\nReplace this with your \
+own info if this is a personal machine.\n\n"
+
+  UnsupportedGitVersionMessage = "\nYour Git version does not support \
+local configuration files. We highly recommend updating to the latest \
+version.\n\n"
+
+  def initialize(home)
+    @home = home
+    if system_git_version_supports_local_config?
+      apply_local_gitconfig unless local_git_config_present?
+    else
+      puts UnsupportedGitVersionMessage
+    end
+  end
+
+  def target_git_version
+   Gem::Version.new('1.7.10')
+  end
+
+  def system_git_version
+   Gem::Version.new(extracted_version_number)
+  end
+
+  def extracted_version_number
+   `git --version`.scan(/\d+/).join('.')
+  end
+
+  def system_git_version_supports_local_config?
+    system_git_version >= target_git_version
+  end
+
+  def local_git_config_present?
+    File.exist?(@home + '/.gitconfig.local')
+  end
+
+  def apply_local_gitconfig
+    FileUtils.cp '.gitconfig.local', @home + '/.gitconfig.local'
+    puts LocalGitConfigCopiedMessage
+  end
+end

bin/hlink

@@ -1,7 +1,8 @@
 #!/usr/bin/env ruby
 require 'fileutils'
+require_relative 'git_configuration_handler'
 
-EXCLUDES = %w(bin custom . .. .git README.md)
+EXCLUDES = %w(bin custom . .. .git README.md .gitconfig.local)
 
 def cwd
   @cwd ||= File.expand_path(File.dirname(__FILE__))
@@ -80,3 +81,7 @@ directories_at(File.join(root,'custom')).each do |custom|
     install(file,dest_dir)
   end
 end
+
+# install a .gitconfig.local if Git version
+# is compatible and file not already present
+GitConfigurationHandler.new(@home)