#!/usr/bin/env ruby

require 'method_log'
require 'method_log/version'
require 'optimist'

options = Optimist::options do
  version MethodLog::VERSION
  banner <<-EOS
Display the commit history for a single method.

Usage:
       method_log [options] <method-signature>

where <method-signature> is in the Ruby Index format e.g. Foo#bar, Bar::Baz#foo, Baz.foo.

and [options] are:
EOS
  opt :patch, 'Generate patch.'
  opt :ruby_version, 'Parser Ruby version (e.g. 2.5)', default: 'current'
  opt :max_count, 'Limit the number of commits to output.', type: :integer, short: 'n'
  opt :stop_at_latest_introduction_of_method, 'Stop at lastest introduction of method.', default: true
  opt :repository_path, 'Path to repository', default: Dir.pwd
end

Optimist.die 'No method signature specified' if ARGV.empty?
method_signature = ARGV[0]

case ruby_version = options[:ruby_version]
when 'current'
  require 'parser/current'
when /^(\d)\.(\d)$/
  begin
    require "parser/ruby#{$1}#{$2}"
    Parser::CurrentRuby = Parser.const_get("Ruby#{$1}#{$2}")
  rescue LoadError
    Optimist.die "Ruby version not supported: #{ruby_version}"
  end
else
  Optimist.die "Ruby version not supported: #{ruby_version}"
end

require 'method_log/repository'
require 'method_log/api'

repository = MethodLog::Repository.new(options[:repository_path])
api = MethodLog::API.new(repository)
api.diffs(method_signature, options).each do |method_commit, method_diff|
  puts method_commit.to_s
  puts
  if options[:patch]
    puts method_diff.to_s(:color)
    puts
  end
end