Opens a gem and its direct dependencies in text mate

mate-gem

#!/usr/bin/env ruby

# Opens the source code for a gem and the gem's direct dependencies in textmate.
#
# When this is mature it will be added to [Dionysus](http://github.com/tekwiz/dionysus).
#
# TODO add banner and better docs to option parser
# TODO add --quiet flag to suppress dependency not found warnings
# TODO add recursive dependencies (e.g. failure: `mate-gem rails 3.0.0.beta3` does not load activemodel 
#      since that is a dependency of activerecord)
#      * should this have a flag to activate or suppress?
#      * do we need to use bundler's dependency resolver?
# TODO add multiple gem loading (e.g. `mate-gem rails inherited_resources dionysus`)
#      * thoughts on version definition syntax/flagging?
#        (e.g. `mate-gem rails-3.0.0.beta3 rspec-core-2.0.0.beta.7`)
#        * is a dot allowed in a gem name? i.e. is this parsable: 
#          `mate-gem rails 3.0.0.beta3 rspec-core-2.0.0.beta.7`
# TODO can this be abstracted for vim, emacs, or any other editor?

EDITOR = 'mate'

require 'optparse'
require 'ostruct'
require 'rubygems'
require 'highline/import'

$options = OpenStruct.new
$options.dependencies = :immediate
$options.gem_name = nil
$options.gem_version = nil
$options.simple = false

opts = OptionParser.new do |opts|
  opts.on('-d', '--dependencies DEPTH', [:immediate, :deep], "Download a new backup copy") do |v|
    $options.dependencies = v
  end
  opts.on('-s', '--simple', "Run the simple interface.  Basically, no color.") do
    $options.simple = true
  end
  opts.on_tail("-h", "--help", "Show this message") do
    puts opts
    exit
  end
end
opts.parse!(ARGV)

$options.gem_name = ARGV.shift
$options.gem_version = ARGV.shift

unless ARGV.empty?
  say(%(Invalid arguments.))
  puts opts
  exit(1)
end

if $options.gem_version
  gem_specs = [Gem.source_index.find_name($options.gem_name, $options.gem_version).first]
else
  t_ = Gem.source_index.find_name($options.gem_name)
  gem_specs = [t_.sort_by {|spec| spec.version}.last]
end
gem_specs.compact!

if gem_specs.nil? or gem_specs.empty?
  say(%(<%=color("ERROR Gem not found", BOLD, RED) %>  #{$options.gem_name} (#{$options.gem_version})))
  exit(1)
end

gem_specs.first.dependencies.each do |dep|
  if (t_ = Gem.source_index.find_name(dep.name, dep.requirement)).empty?
    say(%(<%=color("WARNING Dependency Not Found", BOLD) %>  #{dep.to_s}))
  else
    gem_specs << t_.sort_by {|spec| spec.version}.last
  end
end

puts ''
exec EDITOR + " " + gem_specs.collect! {|s| s.full_gem_path}.join(' ')