Populate the find editor with selected text

When it's empty. We assume the user wants to search for the selected 
text.

See #93

lib/find-view.coffee

@@ -128,6 +128,10 @@ class FindView extends View
     atom.workspaceView.command 'find-and-replace:replace-all', @replaceAll
 
   showFind: =>
+    unless @findEditor.getText()
+      editorView = atom.workspaceView.getActiveView()
+      @findEditor.setText(editorView.getSelectedText()) if editorView
+
     @attach() if not @hasParent()
     @findEditor.focus()
     @findEditor.selectAll()

spec/find-view-spec.coffee

@@ -20,6 +20,19 @@ describe 'FindView', ->
       editor.trigger 'find-and-replace:show'
       expect(atom.workspaceView.find('.find-and-replace')).toExist()
 
+    it "populates the findEditor with selection when there is a selection", ->
+      editor.setSelectedBufferRange([[2, 8], [2, 13]])
+      editor.trigger 'find-and-replace:show'
+      expect(atom.workspaceView.find('.find-and-replace')).toExist()
+      expect(findView.findEditor.getText()).toBe('items')
+
+      findView.findEditor.setText('')
+
+      editor.setSelectedBufferRange([[2, 14], [2, 20]])
+      editor.trigger 'find-and-replace:show'
+      expect(atom.workspaceView.find('.find-and-replace')).toExist()
+      expect(findView.findEditor.getText()).toBe('length')
+
   describe "when FindView's replace editor is visible", ->
     it "keeps the replace editor visible when find-and-replace:show is triggered", ->
       editor.trigger 'find-and-replace:show-replace'