Updated error message format

Added headers and code tags

Made sure that when limiting message size, at least part of the message
is seen.

Change-Id: I404e2f7e86907f701332a62fe46334ff437cca03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1690741
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Debrian Figueroa <debrian@google.com>

recipes/recipe_modules/presubmit/api.py

@@ -164,18 +164,21 @@ def _limitSize(message_list, char_limit=450):
   for index, message in enumerate(message_list):
     char_count += len(message)
     if char_count > char_limit:
-      total_errors = len(message_list)
-      oversized_msg = ('**Error size > %d chars, '
-      'there are %d more error(s) (%d total)**') % (
-        char_limit, total_errors - index, total_errors
-      )
       if index == 0:
         # Show at minimum part of the first error message
-        first_message = message_list[index].replace('\n\n', '\n')
-        return ['\n\n'.join(
-          _limitSize(first_message.splitlines())
+        first_message = message_list[index].splitlines()
+        return ['\n'.join(
+          _limitSize(first_message)
           )
         ]
+      total_errors = len(message_list)
+      # If code is being cropped, the closing code tag will
+      # get removed, so add it back before the hint.
+      code_tag = '```'
+      oversized_msg = ('%s\n**Error size > %d chars, '
+      'there are %d more error(s) (%d total)**') % (
+        code_tag, char_limit, total_errors - index, total_errors
+      )
       return message_list[:index] + [oversized_msg, hint]
   return message_list
 
@@ -220,20 +223,16 @@ def _createSummaryMarkdown(step_json):
   warning_count = len(step_json['warnings'])
   notif_count = len(step_json['notifications'])
   description = (
-    'There are %d error(s), %d warning(s),'
+    '### There are %d error(s), %d warning(s),'
     ' and %d notifications(s). Here are the errors:') % (
       len(errors), warning_count, notif_count
   )
   error_messages = []
 
   for error in errors:
-    # markdown represents new lines with 2 spaces
-    # replacing the \n with \n\n because \n gets replaced with an empty space.
-    # This way it will work on both markdown and plain text.
     error_messages.append(
-      '**ERROR**\n\n%s\n\n%s' % (
-      error['message'].replace('\n', '\n\n'),
-      error['long_text'].replace('\n', '\n\n'))
+      '**ERROR**\n```\n%s\n%s\n```' % (
+      error['message'], error['long_text'])
     )
 
   error_messages = _limitSize(error_messages)
@@ -242,7 +241,7 @@ def _createSummaryMarkdown(step_json):
   error_messages.insert(0, description)
   if warning_count or notif_count:
     error_messages.append(
-      ('To see notifications and warnings,'
+      ('##### To see notifications and warnings,'
       ' look at the stdout of the presubmit step.')
     )
   return '\n\n'.join(error_messages)

recipes/recipe_modules/presubmit/tests/execute.py

@@ -78,7 +78,7 @@ def GenTests(api):
       api.post_process(post_process.StatusFailure) +
       api.post_process(
           post_process.ResultReason,
-         (u'There are 0 error(s), 0 warning(s), and 0 notifications(s).'
+         (u'### There are 0 error(s), 0 warning(s), and 0 notifications(s).'
           ' Here are the errors:'
           '\n\nTimeout occurred during presubmit step.')) +
       api.post_process(post_process.DropExpectation)
@@ -124,21 +124,21 @@ def GenTests(api):
       ) +
       api.post_process(post_process.StatusFailure) +
       api.post_process(post_process.ResultReason, textwrap.dedent(u'''
-          There are 2 error(s), 1 warning(s), and 1 notifications(s). Here are the errors:
+          ### There are 2 error(s), 1 warning(s), and 1 notifications(s). Here are the errors:
 
           **ERROR**
-
+          ```
           Missing LGTM
-
           Here are some suggested OWNERS: fake@
+          ```
 
           **ERROR**
-
+          ```
           Syntax error in fake.py
-
           Expected "," after item in list
+          ```
 
-          To see notifications and warnings, look at the stdout of the presubmit step.
+          ##### To see notifications and warnings, look at the stdout of the presubmit step.
         ''').strip()
       ) +
       api.post_process(post_process.DropExpectation)
@@ -166,34 +166,23 @@ def GenTests(api):
       ) +
       api.post_process(post_process.StatusFailure) +
       api.post_process(post_process.ResultReason, textwrap.dedent('''
-          There are 1 error(s), 0 warning(s), and 0 notifications(s). Here are the errors:
+          ### There are 1 error(s), 0 warning(s), and 0 notifications(s). Here are the errors:
 
           **ERROR**
-
+          ```
           Missing LGTM
-
           Here are some suggested OWNERS:
-
           reallyLongFakeAccountNameEmail@chromium.org
-
           reallyLongFakeAccountNameEmail@chromium.org
-
           reallyLongFakeAccountNameEmail@chromium.org
-
           reallyLongFakeAccountNameEmail@chromium.org
-
           reallyLongFakeAccountNameEmail@chromium.org
-
           reallyLongFakeAccountNameEmail@chromium.org
-
           reallyLongFakeAccountNameEmail@chromium.org
-
           reallyLongFakeAccountNameEmail@chromium.org
-
           reallyLongFakeAccountNameEmail@chromium.org
-
-          **Error size > 450 chars, there are 1 more error(s) (13 total)**
-
+          ```
+          **Error size > 450 chars, there are 2 more error(s) (15 total)**
           **The complete output can be found at the bottom of the presubmit stdout.**
         ''').strip()
       ) +
@@ -220,13 +209,14 @@ def GenTests(api):
       ) +
       api.post_process(post_process.StatusFailure) +
       api.post_process(post_process.ResultReason, textwrap.dedent(u'''
-          There are 1 error(s), 0 warning(s), and 0 notifications(s). Here are the errors:
+        ### There are 1 error(s), 0 warning(s), and 0 notifications(s). Here are the errors:
 
-          **ERROR**
+        **ERROR**
+        ```
+        Infra Failure
 
-          Infra Failure
-
-        ''').lstrip()
+        ```
+        ''').strip()
       ) +
       api.post_process(post_process.DropExpectation)
   )