git.rb

require 'cocaine'
module Kumade
  class Git < Base
    attr_reader :environment
    def initialize(pretending, environment)
      super()
      @pretending  = pretending
      @environment = environment
    end

    def heroku_remote?
      `git config --get remote.#{environment}.url`.strip =~ /^git@heroku\..+:(.+)\.git$/
    end

    def self.environments
      url_remotes = `git remote`.strip.split("\n").map{|remote| [remote, `git config --get remote.#{remote}.url`.strip] }.select{|remote| remote.last =~ /^git@heroku\.com:(.+)\.git$/}.map{|remote| remote.first}
    end

    def push(branch, remote = 'origin', force = false)
      command = ["git push"]
      command << "-f" if force
      command << remote
      command << branch
      command = command.join(" ")
      run_or_error(command, "Failed to push #{branch} -> #{remote}")
      success("Pushed #{branch} -> #{remote}")
    end

    def create(branch)
      unless branch_exist?(branch)
        run_or_error("git branch #{branch}", "Failed to create #{branch}")
      end
    end

    def delete(branch_to_delete, branch_to_checkout)
      run_or_error("git checkout #{branch_to_checkout} && git branch -D #{branch_to_delete}",
                   "Failed to clean up #{branch_to_delete} branch")
    end

    def add_and_commit_all_in(dir, branch, commit_message, success_output, error_output)
      run_or_error "git checkout -b #{branch} && git add -f #{dir} && git commit -m '#{commit_message}'",
                   "Cannot deploy: #{error_output}"
      success success_output
    end

    def current_branch
      `git symbolic-ref HEAD`.sub("refs/heads/", "").strip
    end

    def remote_exists?(remote_name)
      if @pretending
        true
      else
        `git remote` =~ /^#{remote_name}$/
      end
    end

    def dirty?
      !run("git diff --exit-code")
    end

    def ensure_clean_git
      if ! @pretending && dirty?
        error("Cannot deploy: repo is not clean.")
      else
        success("Git repo is clean")
      end
    end

    def branch_exist?(branch)
      run("git show-ref #{branch}")
    end
  end
end