Mercurial > hg
view mercurial/rcutil.py @ 31954:e518192d6bac
pager: set some environment variables if they're not set
Git did this already [1] [2]. We want this behavior too [3].
This provides a better default user experience (like, supporting colors) if
users have things like "PAGER=less" set, which is not uncommon.
The environment variables are provided by a method so extensions can
override them on demand.
[1]: https://github.com/git/git/blob/6a5ff7acb5965718cc7016c0ab6c601454fd7cde/pager.c#L87
[2]: https://github.com/git/git/blob/6a5ff7acb5965718cc7016c0ab6c601454fd7cde/Makefile#L1545
[3]: https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-March/094780.html
author | Jun Wu <quark@fb.com> |
---|---|
date | Thu, 13 Apr 2017 08:27:19 -0700 |
parents | 10d88dc7c010 |
children | bf5e13e38390 |
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# rcutil.py - utilities about config paths, special config sections etc. # # Copyright Mercurial Contributors # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import import os from . import ( encoding, osutil, pycompat, util, ) if pycompat.osname == 'nt': from . import scmwindows as scmplatform else: from . import scmposix as scmplatform systemrcpath = scmplatform.systemrcpath userrcpath = scmplatform.userrcpath def _expandrcpath(path): '''path could be a file or a directory. return a list of file paths''' p = util.expandpath(path) if os.path.isdir(p): join = os.path.join return [join(p, f) for f, k in osutil.listdir(p) if f.endswith('.rc')] return [p] def envrcitems(env=None): '''Return [(section, name, value, source)] config items. The config items are extracted from environment variables specified by env, used to override systemrc, but not userrc. If env is not provided, encoding.environ will be used. ''' if env is None: env = encoding.environ checklist = [ ('EDITOR', 'ui', 'editor'), ('VISUAL', 'ui', 'editor'), ('PAGER', 'pager', 'pager'), ] result = [] for envname, section, configname in checklist: if envname not in env: continue result.append((section, configname, env[envname], '$%s' % envname)) return result def defaultrcpath(): '''return rc paths in default.d''' path = [] defaultpath = os.path.join(util.datapath, 'default.d') if os.path.isdir(defaultpath): path = _expandrcpath(defaultpath) return path def rccomponents(): '''return an ordered [(type, obj)] about where to load configs. respect $HGRCPATH. if $HGRCPATH is empty, only .hg/hgrc of current repo is used. if $HGRCPATH is not set, the platform default will be used. if a directory is provided, *.rc files under it will be used. type could be either 'path' or 'items', if type is 'path', obj is a string, and is the config file path. if type is 'items', obj is a list of (section, name, value, source) that should fill the config directly. ''' envrc = ('items', envrcitems()) if 'HGRCPATH' in encoding.environ: # assume HGRCPATH is all about user configs so environments can be # overridden. _rccomponents = [envrc] for p in encoding.environ['HGRCPATH'].split(pycompat.ospathsep): if not p: continue _rccomponents.extend(('path', p) for p in _expandrcpath(p)) else: normpaths = lambda paths: [('path', os.path.normpath(p)) for p in paths] _rccomponents = normpaths(defaultrcpath() + systemrcpath()) _rccomponents.append(envrc) _rccomponents.extend(normpaths(userrcpath())) return _rccomponents def defaultpagerenv(): '''return a dict of default environment variables and their values, intended to be set before starting a pager. ''' return {'LESS': 'FRX', 'LV': '-c'}