[issue11695] Improve argparse usage/help customization
paul j3 added the comment:
That original template can also be implemented with a customized 'format_help':
def custom_help(self):
formatter = self._get_formatter()
formatter.add_text('My Program, version 3.5')
formatter.add_usage(self.usage, self._actions,
self._mutually_exclusive_groups,
prefix='Usage: ')
formatter.add_text('Some description of my program')
for action_group in self._action_groups:
with formatter.add_section(action_group.title):
formatter.add_text(action_group.description)
formatter.add_arguments(action_group._group_actions)
formatter.add_text('My epilog text')
return formatter.format_help()
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[issue11695] Improve argparse usage/help customization
paul j3 added the comment: This patch has a 'custom_help' which, with a default template, is compatible with 'format_help' (i.e. it passes test_argparse). It also handles the sample template in this issue. Due to long line wrapping issues, the 'Usage: ' string the test template has to be entered separately as a usage 'prefix'. Indenting of long wrapped values (like usage) is correct only if the '%(...)s' string is at the start of a line. I see this as a test-of-concept patch. -- keywords: +patch Added file: http://bugs.python.org/file35713/issue11695_1.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11695 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11695] Improve argparse usage/help customization
paul j3 added the comment: Here's a function that implements the format string: def custom_help(template): def usage(self): formatter = self._get_formatter() formatter.add_usage(self.usage, self._actions, self._mutually_exclusive_groups, prefix='') return formatter.format_help().strip() def groups(self): formatter = self._get_formatter() for action_group in self._action_groups: formatter.start_section(action_group.title) formatter.add_text(action_group.description) formatter.add_arguments(action_group._group_actions) formatter.end_section() astr = formatter.format_help().rstrip() return astr dd = dict( usage=usage(parser), argument_groups=groups(parser), ) return template%dd template = My Program, version 3.5 Usage: %(usage)s Some description of my program %(argument_groups)s My epilog text print(custom_help(template)) This replaces 'parser.format_help' rather than the 'HelpFormatter' class. It in effect uses pieces from 'format_help' to format strings like 'usage', and plugs those into the template. While a template based formatter could be implemented as Formatter subclass, it seems to be an awkward fit. In the current structure, the 'parser' method determines the overall layout of 'help', while the 'formatter' generates the pieces. The proposed template deals with the layout, not the pieces. 'format_help' could cast into this form, using a default template. Possible generalization include: - methods to format other parts of the help - handling of multiline indented blocks - utilizing other templating tools (string.Template, Py3 format, Mako) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11695 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11695] Improve argparse usage/help customization
Changes by Mark Lawrence breamore...@yahoo.co.uk: -- nosy: +paul.j3 versions: +Python 2.7, Python 3.5 -Python 3.3 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11695 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11695] Improve argparse usage/help customization
Changes by John O'Connor tehj...@gmail.com: -- nosy: +jcon ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11695 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11695] Improve argparse usage/help customization
Chris Jerdonek added the comment: +1 to the feature. A closely-related use case is customizing the message displayed by error(), which is normally the usage string followed by the error message. I wanted to append instructions on how to invoke --help, and implemented it this way for CPython's regrtest: http://hg.python.org/cpython/file/6ee721029fd5/Lib/test/regrtest.py#l205 Also take a look at how regrtest formats its usage string as another use case to satisfy: http://hg.python.org/cpython/file/6ee721029fd5/Lib/test/regrtest.py#l9 It seems like many argparse customizations take the form of override this method. Would it make sense for the API to be for customizers to override string-returning methods like make_usage() and make_error() (and that accept a dictionary)? That may give a bit more control than a format string. -- nosy: +chris.jerdonek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11695 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11695] Improve argparse usage/help customization
Changes by Berker Peksag berker.pek...@gmail.com: -- nosy: +berkerpeksag ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11695 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11695] Improve argparse usage/help customization
Changes by Petri Lehtinen pe...@digip.org: -- nosy: +petri.lehtinen ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11695 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue11695] Improve argparse usage/help customization
New submission from Steven Bethard steven.beth...@gmail.com: I'm going to try to merge several closely related issues here. Basically, people would like better control over the usage message formatting so that you could: * Put program name and version information at the top of the message * Customize the usage: string (e.g. capitalize it) One proposal from anatoly techtonik would be to allow a format string so that you could write something like My Program, version 3.5 Usage: %(usage)s Some description of my program %(argument_groups)% My epliog text This should be implemented as a HelpFormatter class, but we might have to expose a little more of the HelpFormatter API (which is currently documented as a no-public API) to make this possible. Patches welcome. ;-) -- components: Library (Lib) messages: 132322 nosy: bethard priority: normal severity: normal stage: needs patch status: open title: Improve argparse usage/help customization type: feature request versions: Python 3.3 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue11695 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
