Refactor handleSaveEvent to use onWillSave async (#1924)

* Update handleSaveEvent to use onWillSave and refactor

* Remove old handleSaveEvent function

* Specify minimum version of Atom of 1.21.0

package.json

@@ -153,7 +153,7 @@
     }
   ],
   "engines": {
-    "atom": ">=1.6.0 <2.0.0"
+    "atom": ">=1.21.0 <2.0.0"
   },
   "dependencies": {
     "align-yaml": "^0.1.8",

src/beautify.coffee

@@ -506,20 +506,17 @@ debug = () ->
 
 handleSaveEvent = ->
   atom.workspace.observeTextEditors (editor) ->
-    pendingPaths = {}
     beautifyOnSaveHandler = ({path: filePath}) ->
-      logger.verbose('Should beautify on this save?')
-      if pendingPaths[filePath]
-        logger.verbose("Editor with file path #{filePath} already beautified!")
-        return
-      buffer = editor.getBuffer()
       path ?= require('path')
-      # Get Grammar
-      grammar = editor.getGrammar().name
       # Get file extension
       fileExtension = path.extname(filePath)
       # Remove prefix "." (period) in fileExtension
       fileExtension = fileExtension.substr(1)
+      # Set path of buffer for unsaved files
+      if editor.getPath() is undefined
+        editor.getBuffer().setPath(filePath)
+      # Get Grammar from the editor
+      grammar = editor.getGrammar().name
       # Get language
       languages = beautifier.languages.getLanguages({grammar, extension: fileExtension})
       if languages.length < 1
@@ -535,23 +532,11 @@ handleSaveEvent = ->
         beautify({editor, onSave: true})
         .then(() ->
           logger.verbose('Done beautifying file', filePath)
-          if editor.isAlive() is true
-            logger.verbose('Saving TextEditor...')
-            # Store the filePath to prevent infinite looping
-            # When Whitespace package has option "Ensure Single Trailing Newline" enabled
-            # It will add a newline and keep the file from converging on a beautified form
-            # and saving without emitting onDidSave event, because there were no changes.
-            pendingPaths[filePath] = true
-            Promise.resolve(editor.save()).then(() ->
-              delete pendingPaths[filePath]
-              logger.verbose('Saved TextEditor.')
-            )
         )
         .catch((error) ->
           return showError(error)
         )
-    disposable = editor.onDidSave(({path : filePath}) ->
-      # TODO: Implement debouncing
+    disposable = editor.getBuffer().onWillSave(({path: filePath}) ->
       beautifyOnSaveHandler({path: filePath})
     )
     plugin.subscriptions.add disposable
@@ -632,4 +617,4 @@ plugin.activate = ->
   @addLanguageCommands()
 
 plugin.deactivate = ->
-  @subscriptions.dispose()
+  @subscriptions.dispose()