Issue #13107: argparse and optparse no longer raises an exception when output
a help on environment with too small COLUMNS. Based on patch by
Elazar Gershuni.
diff --git a/Lib/argparse.py b/Lib/argparse.py
index 30bae57..a4009d0 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -168,6 +168,8 @@
self._prog = prog
self._indent_increment = indent_increment
self._max_help_position = max_help_position
+ self._max_help_position = min(max_help_position,
+ max(width - 20, indent_increment * 2))
self._width = width
self._current_indent = 0
@@ -339,7 +341,7 @@
else:
line_len = len(indent) - 1
for part in parts:
- if line_len + 1 + len(part) > text_width:
+ if line_len + 1 + len(part) > text_width and line:
lines.append(indent + ' '.join(line))
line = []
line_len = len(indent) - 1
@@ -478,7 +480,7 @@
def _format_text(self, text):
if '%(prog)' in text:
text = text % dict(prog=self._prog)
- text_width = self._width - self._current_indent
+ text_width = max(self._width - self._current_indent, 11)
indent = ' ' * self._current_indent
return self._fill_text(text, text_width, indent) + '\n\n'
@@ -486,7 +488,7 @@
# determine the required width and the entry label
help_position = min(self._action_max_length + 2,
self._max_help_position)
- help_width = self._width - help_position
+ help_width = max(self._width - help_position, 11)
action_width = help_position - self._current_indent - 2
action_header = self._format_action_invocation(action)