fix: return error messages for builtin pattern and length checks

Author: benediktziegler

commitizen/cz/base.py

@@ -123,8 +123,16 @@ def validate_commit_message(
         if max_msg_length:
             msg_len = len(commit_msg.partition("\n")[0].strip())
             if msg_len > max_msg_length:
-                return ValidationResult(False, [])
-        return ValidationResult(bool(re.match(pattern, commit_msg)), [])
+                return ValidationResult(
+                    False,
+                    [
+                        f"The commit message subject is too long ({msg_len} > {max_msg_length} characters)."
+                    ],
+                )
+        return ValidationResult(
+            bool(re.match(pattern, commit_msg)),
+            [f"The commit message does not match the pattern: {pattern}"],
+        )
 
     def format_exception_message(
         self, ill_formated_commits: list[tuple[git.GitCommit, list]]

docs/customization.md

@@ -1,4 +1,4 @@
-from commitizen import BaseCommitizenCustomizing commitizen is not hard at all.
+Customizing commitizen is not hard at all.
 We have two different ways to do so.
 
 ## 1. Customize in configuration file