Add package to create a Gist from the editor

src/packages/gists/index.coffee

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+module.exports = require './lib/gists'

src/packages/gists/keymaps/gists.cson

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+'body':
+  'alt-meta-g': 'gist:create'

src/packages/gists/lib/gists.coffee

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+$ = require 'jquery'
+
+module.exports =
+  activate: (rootView) ->
+    rootView.command 'gist:create', '.editor', (e) =>
+      @createGist(e.currentTargetView())
+
+  createGist: (editor) ->
+    gist = { public: false, files: {} }
+    gist.files[editor.getBuffer().getBaseName()] =
+      content: editor.getSelectedText() or editor.getText()
+
+    $.ajax
+      url: 'https://api.github.com/gists'
+      type: 'POST'
+      dataType: 'json'
+      contentType: 'application/json; charset=UTF-8'
+      data: JSON.stringify(gist)
+      success: (response) -> pasteboard.write(response.html_url)

src/packages/gists/spec/gists-spec.coffee

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+RootView = require 'root-view'
+$ = require 'jquery'
+
+describe "Gists package", ->
+
+  [rootView, editor] = []
+
+  beforeEach ->
+    rootView = new RootView(fixturesProject.resolve('sample.js'))
+    atom.loadPackage('gists')
+    editor = rootView.getActiveEditor()
+    spyOn($, 'ajax')
+
+  afterEach ->
+    rootView.deactivate()
+
+  describe "when gist:create is triggered on an editor", ->
+
+    describe "when the editor has no selection", ->
+      it "creates an Ajax request to api.github.com with the entire buffer contents as the Gist's content", ->
+        editor.trigger 'gist:create'
+        expect($.ajax).toHaveBeenCalled()
+        request = $.ajax.argsForCall[0][0]
+        expect(request.url).toBe 'https://api.github.com/gists'
+        expect(request.type).toBe 'POST'
+        requestData = JSON.parse(request.data)
+        expect(requestData.public).toBeFalsy()
+        expect(requestData.files).toEqual 'sample.js': content: editor.getText()
+
+      it "places the created Gist's URL on the clipboard", ->
+        editor.trigger 'gist:create'
+        request = $.ajax.argsForCall[0][0]
+        request.success(html_url: 'https://gist.github.com/1')
+        expect(pasteboard.read()[0]).toBe 'https://gist.github.com/1'
+
+    describe "when the editor has a selection", ->
+      beforeEach ->
+        editor.setSelectedBufferRange [[4, 0], [8, 0]]
+
+      it "creates an Ajax with the selected text as the Gist's content", ->
+        editor.trigger 'gist:create'
+        expect($.ajax).toHaveBeenCalled()
+        request = $.ajax.argsForCall[0][0]
+        requestData = JSON.parse(request.data)
+        expect(requestData.files).toEqual 'sample.js': content: editor.getSelectedText()