D7775: ui: refactor `readconfig()` into a form that can consume resources

[mharbison72 (Matt Harbison)]

mharbison72 created this revision.
Herald added a subscriber: mercurial-devel.
Herald added a reviewer: hg-reviewers.

REVISION SUMMARY
  The old form can't completely go away, because files outside of packages still
  need to be read.  The name passed in here is a tuple of `package name, resource`
  as needed by the resource API.
  
  I like the idea of stating the config file is embedded in the executable by
  listing is as `exe!package.resource`.  This would be consistent with how
  `debuginstall` points to the executable for the python executable, lib, and
  installed modules.  While in practice the filesystem path is available from the
  backing ResourceReader when the resource is opened, it is a relative path on py2
  and absolute on py3.  Further, while this would show in the `hg config` output
  for each option if set as such here, it doesn't show in the `reading from...`
  line when `--debug` is used.  The file isn't actually open where that prints, so
  there's no way I see to get that info there.  So I opted for the simple prefix
  to distinguish resources from files.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D7775

AFFECTED FILES
  mercurial/ui.py

CHANGE DETAILS

diff --git a/mercurial/ui.py b/mercurial/ui.py
--- a/mercurial/ui.py
+++ b/mercurial/ui.py
@@ -45,6 +45,7 @@
 from .utils import (
     dateutil,
     procutil,
+    resourceutil,
     stringutil,
 )
 
@@ -424,6 +425,20 @@
             )
         return False
 
+    def read_resource_config(
+        self, name, root=None, trust=False, sections=None, remap=None
+    ):
+        try:
+            fp = resourceutil.open_resource(name[0], name[1])
+        except IOError:
+            if not sections:  # ignore unless we were looking for something
+                return
+            raise
+
+        self._readconfig(
+            b'resource:%s.%s' % name, fp, root, trust, sections, remap
+        )
+
     def readconfig(
         self, filename, root=None, trust=False, sections=None, remap=None
     ):
@@ -434,6 +449,11 @@
                 return
             raise
 
+        self._readconfig(filename, fp, root, trust, sections, remap)
+
+    def _readconfig(
+        self, filename, fp, root=None, trust=False, sections=None, remap=None
+    ):
         with fp:
             cfg = config.config()
             trusted = sections or trust or self._trusted(fp, filename)



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Cc: mercurial-devel