Bind meta-= to autoindent currently selected rows

Closes #142

src/app/edit-session.coffee

@@ -208,6 +208,9 @@ class EditSession
   toggleLineCommentsInSelection: ->
     @mutateSelectedText (selection) -> selection.toggleLineComments()
 
+  autoIndentSelectedRows: ->
+    @mutateSelectedText (selection) -> selection.autoIndentSelectedRows()
+
   cutToEndOfLine: ->
     maintainPasteboard = false
     @mutateSelectedText (selection) ->

src/app/editor.coffee

@@ -117,6 +117,7 @@ class Editor extends View
       'editor:select-word': @selectWord
       'editor:newline': @insertNewline
       'editor:indent': @indent
+      'editor:auto-indent': @autoIndent
       'editor:indent-selected-rows': @indentSelectedRows
       'editor:outdent-selected-rows': @outdentSelectedRows
       'editor:backspace-to-beginning-of-word': @backspaceToBeginningOfWord
@@ -248,6 +249,7 @@ class Editor extends View
   insertNewline: -> @activeEditSession.insertNewline()
   insertNewlineBelow: -> @activeEditSession.insertNewlineBelow()
   indent: (options) -> @activeEditSession.indent(options)
+  autoIndent: (options) -> @activeEditSession.autoIndentSelectedRows(options)
   indentSelectedRows: -> @activeEditSession.indentSelectedRows()
   outdentSelectedRows: -> @activeEditSession.outdentSelectedRows()
   cutSelection: -> @activeEditSession.cutSelectedText()

src/app/keymaps/editor.cson

@@ -4,6 +4,7 @@
   'enter': 'editor:newline'
   'meta-enter': 'editor:newline-below'
   'tab': 'editor:indent'
+  'meta-=': 'editor:auto-indent'
   'meta-d': 'editor:delete-line'
   'ctrl-[': 'editor:fold-current-row'
   'ctrl-]': 'editor:unfold-current-row'

src/app/selection.coffee

@@ -307,6 +307,10 @@ class Selection
       if matchLength = buffer.lineForRow(row).match(leadingTabRegex)?[0].length
         buffer.delete [[row, 0], [row, matchLength]]
 
+  autoIndentSelectedRows: ->
+    [start, end] = @getBufferRowRange()
+    @editSession.autoIndentBufferRows(start, end)
+
   toggleLineComments: ->
     @modifySelection =>
       @editSession.toggleLineCommentsForBufferRows(@getBufferRowRange()...)