gruber.rb

#!/usr/bin/env ruby
#puts "what dir are you in?"
#$gitdir = $stdin.gets.chomp #should work off of cd and then check for .git dir

if File.exists?('.git')
  $gitdir = `pwd`.chomp
else
  begin
    #  Dir::chdir($gitdir)
    rd, wr = IO::pipe
    pid = Process.fork do
      $stdout.reopen(wr)
      rd.close
      exec("git rev-parse --git-dir")
    end
    wr.close
    rd.each do |line|
      $gitdir = "#{line}".chomp.gsub(/\.git/i, '')
    end
    Process.wait(pid)
  end
end

class Gruber_parser
  def latest_commit?
    begin
      #  Dir::chdir($gitdir)
      rd, wr = IO::pipe
      pid = Process.fork do
        $stdout.reopen(wr)
        rd.close
        exec("git rev-parse HEAD")
      end
      wr.close
      rd.each do |line|
        @commit = "#{line}"
      end
      Process.wait(pid)
    end
    require 'grit'
    begin
      repo = Grit::Repo.new($gitdir)
    rescue Grit::InvalidGitRepositoryError => e
      puts "#{e} is not a git repo"
      exit 1
    end
    sha = repo.commits[0]
    if @commit.match(/.*#{sha}.*$/)
      puts "You're on the latest commit"
    else
      #make method to check how many commits away from the latest you are
      puts ":("
    end
  end

  def get_branch
    begin
      #  Dir::chdir($gitdir)
      rd, wr = IO::pipe
      pid = Process.fork do
        $stdout.reopen(wr)
        rd.close
        exec("git branch")
      end
      wr.close
      rd.each do |line|
        @branch = "#{line}".chomp
      end
      Process.wait(pid)

    end
    return @branch
  end

  def remote_ahead?
    get_branch
    begin
      #  Dir::chdir($gitdir)
      rd, wr = IO::pipe
      pid = Process.fork do
        $stdout.reopen(wr)
        rd.close
        exec("git remote -v update > /dev/null 2>&1")
      end
      wr.close
      rd.each do |line|
        @all_lines = "#{line}"
        @up_to_date = "#{line}" unless line !~ /up to date/
      end
      Process.wait(pid)
    end
    if @up_to_date != ''
      puts "Remote tracking branch for #{@branch}: up to date"
    else
      print @all_lines
    end
  end

  def latest_remote_branch
    begin
      #  Dir::chdir($gitdir)
      rd, wr = IO::pipe
      pid = Process.fork do
        $stdout.reopen(wr)
        rd.close
        exec("git for-each-ref --format='%(committerdate)%09%(refname)' --sort=-committerdate refs/remotes/")
      end
      wr.close
      rd.each do |line|
        @latest_remote_b = "#{line}" unless line =~ /HEAD/
      end
      Process.wait(pid)
    end
    puts @latest_remote_b 
  end

  def type_of_object(object)
    begin
      #  Dir::chdir($gitdir)
      rd, wr = IO::pipe
      pid = Process.fork do
        $stdout.reopen(wr)
        rd.close
        exec("git cat-file -t #{object}")
      end
      wr.close
      rd.each do |line|
        @type_of_object = "#{line}".chomp
      end
      Process.wait(pid)
    end
    return @type_of_object
  end

  def inspect_sha
    require 'grit'
    begin
      repo = Grit::Repo.new($gitdir)
    rescue Grit::InvalidGitRepositoryError => e
      puts "#{e} is not a git repo"
      exit 1
    end
    sha = ARGV.first
    type_of_object(sha)
    type_of_obj = @type_of_object
    grit_obj = repo.commits(sha, 1).first
    puts 
    puts "========================================"
    print "inspecting #{type_of_obj}: #{sha}\n"
    if type_of_obj == 'commit'
      tree = grit_obj.tree
      sha_of_tree = tree.id
      puts "        root tree: #{sha_of_tree}"
      puts "========================================"
      puts
      tree.contents.each do |obj|
        print "----------------------------------------\n"
        p obj
        print " " + "#{obj.name}" + "    " + "#{obj.mode}\n"
      end
    elsif type_of_obj == 'tree'
      tree = repo.tree(sha)
      puts "========================================"
      puts
      tree.contents.each do |obj|
        print "----------------------------------------\n"
        p obj
        print " " + "#{obj.name}" + "    " + "#{obj.mode}\n"
      end
    elsif type_of_obj == 'blob'
      blob = repo.blob(sha)
      puts "========================================"
      puts
      puts blob.data
    end
  end


  ARGV.each do |options|
    if options =~ %r(\A-[-]?l(atest)?c(ommit)?$)
      parser = Gruber_parser.new
      parser.latest_commit?
    elsif options =~ %r(\A-[-]?r(emote)?a(head)?$)
      parser = Gruber_parser.new
      parser.remote_ahead?
    elsif options =~ %r(\A-[-]?lr(emote)?(b)?(r)?(anch)?$)
      parser = Gruber_parser.new
      parser.latest_remote_branch
    elsif options =~ %r(\A[\d\D]{40}$)
      parser = Gruber_parser.new
      parser.inspect_sha
    end
  end
end