Add success msg for only notes output (#12306)

Author: 97littleleaf11

mypy/dmypy_server.py

@@ -772,12 +772,11 @@ def pretty_messages(self, messages: List[str], n_sources: int,
                                                       fixed_terminal_width=terminal_width)
         if self.options.error_summary:
             summary: Optional[str] = None
-            if messages:
-                n_errors, n_files = count_stats(messages)
-                if n_errors:
-                    summary = self.formatter.format_error(n_errors, n_files, n_sources,
-                                                          use_color=use_color)
-            else:
+            n_errors, n_notes, n_files = count_stats(messages)
+            if n_errors:
+                summary = self.formatter.format_error(n_errors, n_files, n_sources,
+                                                      use_color=use_color)
+            elif not messages or n_notes == len(messages):
                 summary = self.formatter.format_success(n_sources, use_color)
             if summary:
                 # Create new list to avoid appending multiple summaries on successive runs.

mypy/main.py

@@ -113,15 +113,15 @@ def main(script_path: Optional[str],
     if messages:
         code = 2 if blockers else 1
     if options.error_summary:
-        if messages:
-            n_errors, n_files = util.count_stats(messages)
-            if n_errors:
-                summary = formatter.format_error(
-                    n_errors, n_files, len(sources), blockers=blockers,
-                    use_color=options.color_output
-                )
-                stdout.write(summary + '\n')
-        else:
+        n_errors, n_notes, n_files = util.count_stats(messages)
+        if n_errors:
+            summary = formatter.format_error(
+                n_errors, n_files, len(sources), blockers=blockers,
+                use_color=options.color_output
+            )
+            stdout.write(summary + '\n')
+        # Only notes should also output success
+        elif not messages or n_notes == len(messages):
             stdout.write(formatter.format_success(len(sources), options.color_output) + '\n')
         stdout.flush()
 

mypy/util.py

@@ -435,11 +435,12 @@ def check_python_version(program: str) -> None:
                  "please upgrade to 3.6 or newer".format(name=program))
 
 
-def count_stats(errors: List[str]) -> Tuple[int, int]:
-    """Count total number of errors and files in error list."""
-    errors = [e for e in errors if ': error:' in e]
-    files = {e.split(':')[0] for e in errors}
-    return len(errors), len(files)
+def count_stats(messages: List[str]) -> Tuple[int, int, int]:
+    """Count total number of errors, notes and error_files in message list."""
+    errors = [e for e in messages if ': error:' in e]
+    error_files = {e.split(':')[0] for e in errors}
+    notes = [e for e in messages if ': note:' in e]
+    return len(errors), len(notes), len(error_files)
 
 
 def split_words(msg: str) -> List[str]: