Config: Implement custom argparse TextHelpFormatter to keep line return

mylib/config.py

@@ -8,8 +8,10 @@ from getpass import getpass
 from logging.config import fileConfig
 import logging
 import os
+import re
 import stat
 import sys
+import textwrap
 
 import argcomplete
 import keyring
@@ -388,6 +390,25 @@ class ConfigSection:
         return '\n'.join(lines)
 
 
+class RawWrappedTextHelpFormatter(argparse.RawDescriptionHelpFormatter):
+
+    def _split_lines(self, text, width):
+        result = []
+        for line in textwrap.dedent(text).splitlines():
+            # Keep empty line
+            if line == "":
+                result.append(line)
+                continue
+            # Split ident prefix and line text
+            m = re.match('^( *)(.*)$', line)
+            ident = m.group(1)
+            line_text = m.group(2)
+            # Wrap each lines and add in result with ident prefix
+            for l in textwrap.wrap(line_text, width - len(ident)):
+                result.append(ident + l)
+        return result
+
+
 class Config:
     """ Configuration helper """
 
@@ -543,6 +564,7 @@ class Config:
 
         self.options_parser = argparse.ArgumentParser(
             description=kwargs.pop('description', self.appname),
+            formatter_class=RawWrappedTextHelpFormatter,
             **kwargs)
 
         self.options_parser.add_argument(