add initial bookmark plugin

src/packages/bookmarks/keymaps/bookmarks.cson

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+'.editor':
+  'meta-f2': 'bookmarks:toggle-bookmark'
+  'f2': 'bookmarks:jump-to-next-bookmark'
+  'shift-f2': 'bookmarks:jump-to-previous-bookmark'

src/packages/bookmarks/lib/bookmarks-view.coffee

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+_ = require 'underscore'
+
+module.exports =
+class BookmarksView
+  @activate: ->
+    rootView.eachEditor (editor) =>
+      new BookmarksView(editor) if editor.attached and editor.getPane()?
+
+  editor: null
+
+  constructor: (@editor) ->
+    @editor.on 'editor:display-updated', @updateBookmarkedLines
+
+    rootView.command 'bookmarks:toggle-bookmark', '.editor', @toggleBookmark
+    rootView.command 'bookmarks:jump-to-next-bookmark', '.editor', @jumpToNextBookmark
+    rootView.command 'bookmarks:jump-to-previous-bookmark', '.editor', @jumpToPreviousBookmark
+
+  toggleBookmark: =>
+    cursors = @editor.getCursors()
+    for cursor in cursors
+      position = cursor.getBufferPosition()
+      bookmarks = @findBookmarkMarkers(position.row)
+
+      if bookmarks and bookmarks.length
+        bookmark.destroy() for bookmark in bookmarks
+        console.log('removing mark', position, bookmark)
+      else
+        newmark = @createBookmarkMarker(position.row)
+        console.log('bookmarking', position, newmark)
+
+  updateBookmarkedLines: =>
+    console.log('update!', @editor)
+
+  jumpToNextBookmark: =>
+    console.log('next bm', @editor)
+
+  jumpToPreviousBookmark: =>
+    console.log('prev bm', @editor)
+
+
+  ### Internal ###
+
+  createBookmarkMarker: (bufferRow) ->
+    range = [[bufferRow, 0], [bufferRow, 0]]
+    @displayBuffer().markBufferRange(range, @bookmarkMarkerAttributes(invalidationStrategy: 'never'))
+
+  findBookmarkMarkers: (bufferRow) ->
+    @displayBuffer().findMarkers(@bookmarkMarkerAttributes(startBufferRow: bufferRow))
+
+  bookmarkMarkerAttributes: (attributes={}) ->
+    _.extend(attributes, class: 'bookmark', displayBufferId: @displayBuffer().id)
+
+  displayBuffer: ->
+    @editor.activeEditSession.displayBuffer

src/packages/bookmarks/package.cson

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+'main': './lib/bookmarks-view'
+'description': 'Can mark lines, then jump back to them'

src/packages/bookmarks/spec/bookmarks-view-spec.coffee

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+RootView = require 'root-view'
+_ = require 'underscore'
+
+fdescribe "Bookmarks package", ->
+  editor = null
+  editSession = null
+  displayBuffer = null
+
+  beforeEach ->
+    window.rootView = new RootView
+    rootView.open('sample.js')
+    rootView.enableKeymap()
+    atom.activatePackage('bookmarks', immediate: true)
+    rootView.attachToDom()
+    editor = rootView.getActiveView()
+    editSession = editor.activeEditSession
+    displayBuffer = editSession.displayBuffer
+
+
+  describe "toggling bookmarks", ->
+    it "creates a marker when toggled", ->
+      editSession.setCursorBufferPosition([3, 10])
+      expect(displayBuffer.findMarkers(class: 'bookmark').length).toEqual 0
+
+      editor.trigger 'bookmarks:toggle-bookmark'
+
+      markers = displayBuffer.findMarkers(class: 'bookmark')
+      expect(markers.length).toEqual 1
+      expect(markers[0].getBufferRange()).toEqual [[3, 0], [3, 0]]
+
+    it "removes marker when toggled", ->
+      editSession.setCursorBufferPosition([3, 10])
+      expect(displayBuffer.findMarkers(class: 'bookmark').length).toEqual 0
+
+      editor.trigger 'bookmarks:toggle-bookmark'
+      expect(displayBuffer.findMarkers(class: 'bookmark').length).toEqual 1
+
+      editor.trigger 'bookmarks:toggle-bookmark'
+      expect(displayBuffer.findMarkers(class: 'bookmark').length).toEqual 0