basic gemfile extension

extensions/gemfile/gemfile.coffee

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+$ = require 'jquery'
+_ = require 'underscore'
+
+fs = require 'fs'
+Extension = require 'extension'
+KeyBinder = require 'key-binder'
+Event = require 'event'
+Watcher = require 'watcher'
+
+module.exports =
+class Gemfile extends Extension
+  constructor: ->
+    Event.on 'extensions:loaded', @addRubyGemsDir
+
+  addRubyGemsDir: =>
+    paths = window.extensions.Tree.paths
+    gemfile = _.detect paths, ({path}) -> /Gemfile/i.test path
+
+    if gemfile
+      paths.push
+        label: "RubyGems"
+        path: "http://rubygems.org/"
+        paths: @gemsFromGemFile gemfile.path
+      window.extensions.Tree.reload()
+
+  gemsFromGemFile: (path) ->
+    file = fs.read path
+    gems = []
+
+    for line in file.split "\n"
+      if gem = line.match(/^\s*gem ['"](.+?)['"]/)?[1]
+        gems.push label: gem, path: "https://rubygems.org/gems/#{gem}"
+
+    gems

extensions/gemfile/index.coffee

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+module.exports = require 'gemfile/gemfile'