Handle Elm compiler errors

The Elm compiler can run successfully and produce a list of compile errors, or
the compiler can fail with an error itself. Elm Language Support now handles
both correctly.

Fixes #51

Author: sentience

Syntaxes/Elm Compile Messages.sublime-syntax

@@ -31,8 +31,8 @@ contexts:
         (.+)         # \4: tag
         [ ][-][ ]    # separator
         (.+?):       # \5: $file
-        (\d+):       # \6: $line
-        (\d+)        # \7: $column
+        (\d+):?      # \6: $line
+        (\d+)?       # \7: $column
         \n$          # End
       comment: '-- type: TAG - file:line:column\nMessage\n'
       captures:

elm_make.py

@@ -86,7 +86,7 @@ def create_panel(self, working_dir):
             # Enable result navigation
             settings.set(
                 'result_file_regex',
-                r'^\-\- \w+: (?=.+ \- (.+?):(\d+):(\d+))(.+) \- .*$'
+                r'^\-\- \w+: (?=.+ \- (.+?):(\d+)(?=:(\d+))?)(.+) \- .*$'
             )
             settings.set('result_base_dir', working_dir)
 
@@ -160,7 +160,12 @@ def format_output(self, output):
         try:
             data = json.loads(output)
             log_string('make.logging.json', output)
-            return self.format_errors(data['errors'])
+            if data['type'] == 'compile-errors':
+                return self.format_errors(data['errors'])
+            elif data['type'] == 'error':
+                return self.format_compiler_error(data)
+            else:
+                return 'Unrecognized compiler output:\n' + str(output) + '\n\nPlease report this bug in Elm Language Support.\n\n'
         except ValueError as e:
             log_string('make.logging.invalid_json', output)
             return ''
@@ -185,6 +190,18 @@ def format_problem(self, file, problem):
         vars.pop('self') # https://bugs.python.org/issue23671
         return error_format.substitute(**vars)
 
+    def format_compiler_error(self, error):
+        error_format = string.Template('-- $type: $title - $file:1\n\n$message\n')
+
+        type = 'error'
+        title = error['title']
+        file = error['path']
+        message = self.format_message(error['message'])
+
+        vars = locals()
+        vars.pop('self') # https://bugs.python.org/issue23671
+        return error_format.substitute(**vars)
+
     def format_message(self, message):
         format = lambda msg: msg['string'] if 'string' in msg else msg