Updated presubmit error message format.

Changed all headers in message to be the size of header 4 tags.

Made sure there is always a new line after code tag(```).

Change-Id: I772941a8bbf0634c9496ec648533110997e23cde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1702293
Commit-Queue: Debrian Figueroa <debrian@google.com>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>

recipes/recipe_modules/presubmit/api.py

@@ -175,9 +175,10 @@ def _limitSize(message_list, char_limit=450):
       # 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, '
+      message_list[index - 1] = '\n'.join((message_list[index - 1], code_tag))
+      oversized_msg = ('\n**Error size > %d chars, '
       'there are %d more error(s) (%d total)**') % (
-        code_tag, char_limit, total_errors - index, total_errors
+        char_limit, total_errors - index, total_errors
       )
       return message_list[:index] + [oversized_msg, hint]
   return message_list
@@ -223,7 +224,7 @@ 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
   )
@@ -241,7 +242,7 @@ 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)
@@ -124,7 +124,7 @@ 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**
           ```
@@ -138,7 +138,7 @@ def GenTests(api):
           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)
@@ -166,7 +166,7 @@ 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**
           ```
@@ -182,6 +182,7 @@ def GenTests(api):
           reallyLongFakeAccountNameEmail@chromium.org
           reallyLongFakeAccountNameEmail@chromium.org
           ```
+
           **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()
@@ -209,7 +210,7 @@ def GenTests(api):
       ) +
       api.post_process(post_process.StatusException) +
       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**
         ```