Allow for custom elm-format binary names (#15)

* Allow for custom elm-format binary names

* Indent JSON files by 4 spaces instead of tabs

README.md

@@ -43,7 +43,8 @@
     2. Add the absolute path of the directory containing `elm-oracle` to the `elm_paths` setting in your Elm Language Support User settings
 - I have `elm-format` installed, but it's not working
     1. Make sure `elm-format` is on your PATH, or
-    2. Add the absolute path of the directory containing `elm-format` to the `elm_paths` setting in your Elm Language Support User settings. Note that you can combine paths with the above, so an example might be `"elm_paths": "/users/alex/elm-format:/users/alex/elm-oracle"`
+    2. If using an alternate name for the binary (`elm-format-0.17` or `elm-format-0.18`) add it to the `elm_format_binary` setting in your Elm Language Support User settings; an example might be `"elm_format_binary": "elm-format-0.18",`, or
+    3. Add the absolute path of the directory containing `elm-format` to the `elm_paths` setting in your Elm Language Support User settings. Note that you can combine paths with the above, so an example might be `"elm_paths": "/users/alex/elm-format:/users/alex/elm-oracle"`
 - Elm format automatically runs every time I save a file, but there are some files I don't want it to run on
     1. If there are certain Elm source files you don't want to automatically run `elm-format` on, for example elm-css based files, you can set a regex filter which will search the full filename (including the path to the file). If the regex matches, then it will not automatically run `elm-format` on the file when you save. For example, the following filter would prevent automatic `elm-format` on a file named `elm-css/src/Css/TopBar.elm`:
         `"elm_format_filename_filter": "elm-css/src/Css/.*\\.elm$"`

Settings/Elm Language Support.sublime-settings

@@ -1,8 +1,9 @@
 {
     "debug": false,
-	"enabled": true,
-	"elm_docs_path": "docs.json",
-	"elm_format_on_save": true,
-	"elm_format_filename_filter": "",
-	"elm_paths": ""
+    "enabled": true,
+    "elm_docs_path": "docs.json",
+    "elm_format_binary": "elm-format",
+    "elm_format_on_save": true,
+    "elm_format_filename_filter": "",
+    "elm_paths": ""
 }

elm_format.py

@@ -17,22 +17,23 @@ def run(self, edit):
 		    path_separator = ';'
 
 		settings = sublime.load_settings('Elm Language Support.sublime-settings')
+		binary = settings.get('elm_format_binary', 'elm-format')
 		path = settings.get('elm_paths', '')
 		if path:
 			old_path = os.environ['PATH']
 			os.environ['PATH'] = os.path.expandvars(path + path_separator + '$PATH')
 
-		command = ['elm-format', self.view.file_name(), '--yes']
+		command = [binary, self.view.file_name(), '--yes']
 		p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=shell)
 
 		if path:
 			os.environ['PATH'] = old_path
 
 		output, errors = p.communicate()
-		
+
 		if settings.get('debug', False):
 		    string_settings = sublime.load_settings('Elm User Strings.sublime-settings')
-		    print(string_settings.get('logging.prefix', '') + '(elm-format) ' + str(output.strip()), '\nerrors: ' + str(errors.strip()))
+		    print(string_settings.get('logging.prefix', '') + '(' + binary + ') ' + str(output.strip()), '\nerrors: ' + str(errors.strip()))
 		    if str(errors.strip()):
 		        print('Your PATH is: ', os.environ['PATH'])