rcutil: move scmutil.*rcpath to rcutil (API)

As discussed at [1], the logic around "actual config"s seem to be
non-trivial enough that it's worth a new module.

This patch creates the module and move "scmutil.*rcpath" functions there as
the first step. More methods will be moved to the module in the future.

The module is different from config.py because the latter only cares about
data structure and parsing, and does not care about special case, or system
config paths, or environment variables.

[1]: https://www.mercurial-scm.org/pipermail/mercurial-devel/2017-March/095503.html

mercurial/rcutil.py

@@ -0,0 +1,64 b''
+# 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 osrcpath():
+    '''return default os-specific hgrc search path'''
+    path = []
+    defaultpath = os.path.join(util.datapath, 'default.d')
+    if os.path.isdir(defaultpath):
+        for f, kind in osutil.listdir(defaultpath):
+            if f.endswith('.rc'):
+                path.append(os.path.join(defaultpath, f))
+    path.extend(systemrcpath())
+    path.extend(userrcpath())
+    path = [os.path.normpath(f) for f in path]
+    return path
+
+_rcpath = None
+
+def rcpath():
+    '''return hgrc search path. if env var HGRCPATH is set, use it.
+    for each item in path, if directory, use files ending in .rc,
+    else use item.
+    make HGRCPATH empty to only look in .hg/hgrc of current repo.
+    if no HGRCPATH, use default os-specific path.'''
+    global _rcpath
+    if _rcpath is None:
+        if 'HGRCPATH' in encoding.environ:
+            _rcpath = []
+            for p in encoding.environ['HGRCPATH'].split(pycompat.ospathsep):
+                if not p:
+                    continue
+                p = util.expandpath(p)
+                if os.path.isdir(p):
+                    for f, kind in osutil.listdir(p):
+                        if f.endswith('.rc'):
+                            _rcpath.append(os.path.join(p, f))
+                else:
+                    _rcpath.append(p)
+        else:
+            _rcpath = osrcpath()
+    return _rcpath

mercurial/commands.py

@@ -43,6 +43,7 b' from . import ('
     patch,
     phases,
     pycompat,
+    rcutil,
     revsetlang,
     scmutil,
     server,
@@ -1776,9 +1777,9 b' def config(ui, repo, *values, **opts):'
                 raise error.Abort(_("can't use --local outside a repository"))
             paths = [repo.vfs.join('hgrc')]
         elif opts.get('global'):
-            paths = scmutil.systemrcpath()
+            paths = rcutil.systemrcpath()
         else:
-            paths = scmutil.userrcpath()
+            paths = rcutil.userrcpath()
 
         for f in paths:
             if os.path.exists(f):
@@ -1803,7 +1804,7 b' def config(ui, repo, *values, **opts):'
         return
     ui.pager('config')
     fm = ui.formatter('config', opts)
-    for f in scmutil.rcpath():
+    for f in rcutil.rcpath():
         ui.debug('read config from: %s\n' % f)
     untrusted = bool(opts.get('untrusted'))
     if values:

mercurial/scmutil.py

@@ -20,7 +20,6 b' from . import ('
     encoding,
     error,
     match as matchmod,
-    osutil,
     pathutil,
     phases,
     pycompat,
@@ -35,8 +34,6 b" if pycompat.osname == 'nt':"
 else:
     from . import scmposix as scmplatform
 
-systemrcpath = scmplatform.systemrcpath
-userrcpath = scmplatform.userrcpath
 termsize = scmplatform.termsize
 
 class status(tuple):
@@ -391,45 +388,6 b' def walkrepos(path, followsym=False, see'
                         newdirs.append(d)
             dirs[:] = newdirs
 
-def osrcpath():
-    '''return default os-specific hgrc search path'''
-    path = []
-    defaultpath = os.path.join(util.datapath, 'default.d')
-    if os.path.isdir(defaultpath):
-        for f, kind in osutil.listdir(defaultpath):
-            if f.endswith('.rc'):
-                path.append(os.path.join(defaultpath, f))
-    path.extend(systemrcpath())
-    path.extend(userrcpath())
-    path = [os.path.normpath(f) for f in path]
-    return path
-
-_rcpath = None
-
-def rcpath():
-    '''return hgrc search path. if env var HGRCPATH is set, use it.
-    for each item in path, if directory, use files ending in .rc,
-    else use item.
-    make HGRCPATH empty to only look in .hg/hgrc of current repo.
-    if no HGRCPATH, use default os-specific path.'''
-    global _rcpath
-    if _rcpath is None:
-        if 'HGRCPATH' in encoding.environ:
-            _rcpath = []
-            for p in encoding.environ['HGRCPATH'].split(pycompat.ospathsep):
-                if not p:
-                    continue
-                p = util.expandpath(p)
-                if os.path.isdir(p):
-                    for f, kind in osutil.listdir(p):
-                        if f.endswith('.rc'):
-                            _rcpath.append(os.path.join(p, f))
-                else:
-                    _rcpath.append(p)
-        else:
-            _rcpath = osrcpath()
-    return _rcpath
-
 def intrev(rev):
     """Return integer for a given revision that can be used in comparison or
     arithmetic operation"""

mercurial/ui.py

@@ -33,6 +33,7 b' from . import ('
     formatter,
     progress,
     pycompat,
+    rcutil,
     scmutil,
     util,
 )
@@ -211,7 +212,7 b' class ui(object):'
         """Create a ui and load global and user configs"""
         u = cls()
         # we always trust global config files
-        for f in scmutil.rcpath():
+        for f in rcutil.rcpath():
             u.readconfig(f, trust=True)
         return u