自分用railsなプロジェクトでgitのコミットメッセージを一部自動生成するスクリプト

gistfile1.rb

#!/usr/bin/env ruby
#

# .git/hooks/prepare-commit-msg に配置する

# RAILS用コミットメッセージ追加
if ARGV[1] && ARGV[1].include?("message")
  files = `git diff --cached --name-only`
  change_files = files.split("\n")

  prefix = []
  if change_files.any? { |v| v.include?("app/controllers/") }
    prefix << "controller"
  end
  if change_files.any? { |v| v.include?("app/models/") }
    prefix << "model"
  end
  if change_files.any? { |v| v.include?("app/views/") }
    prefix << "view"
  end
  if change_files.any? { |v| v.include?("app/decorators/") }
    prefix << "decorator"
  end
  if change_files.any? { |v| v.include?("app/services/") }
    prefix << "service"
  end
  if change_files.any? { |v| v.include?("app/helpers/") }
    prefix << "helper"
  end
  if change_files.any? { |v| v.include?("app/assets/javascripts/") }
    prefix << "js"
  end
  if change_files.any? { |v| v.include?("app/assets/stylesheets/") }
    prefix << "css"
  end
  if change_files.any? { |v| v.include?("spec/") }
    prefix << "spec"
  end
  if change_files.any? { |v| v.include?("lib/") }
    prefix << "lib"
  end
  if change_files.any? { |v| v.include?("db/migrate") }
    prefix << "db migrate"
  end

  commit_messages = File.readlines(ARGV[0]).join("")

  # : を含んでいるときは自分でprefixを書いてる時
  if commit_messages.include?(":")
    puts "SKIP RAILS PREFIX"
  elsif commit_messages.include?("@@ignore")
    puts "IGNORE PREFIX"
    message = commit_messages.gsub("@@ignore ","")
    open(ARGV[0], 'w') do |file|
      file.puts message
    end
  else
    puts "ADD RAILS PREFIX -- #{prefix.join(", ")}"
    open(ARGV[0], 'w') do |file|
      branch_raw = `git rev-parse --abbrev-ref HEAD`
      # ブランチ名は projectname-xxx (xxxはissue番号)
      branch = branch_raw.match(/projectname-(\d+)/)
      if branch
        file.print "[PROJECTNAME-#{branch[1]}] "
      end
      if prefix.any?
        file.print "#{prefix.join(" & ")}"
        file.print(": ")
      end
      file.puts commit_messages
    end
  end
end