fix: match patterns relative to root

I was surprised fixer patterns (used to determine which fixers to run)
are applies to the parent directory, not the repo root
directory. Danny Hooper (the author of the extension) seemed to agree
that it's better to apply them to the repo root, so that's what this
patch does.

Differential Revision: https://phab.mercurial-scm.org/D7101

hgext/fix.py

@@ -46,8 +46,10 b' tool needs to operate on unchanged files'
 to false.
 
 The :pattern suboption determines which files will be passed through each
-configured tool. See :hg:`help patterns` for possible values. If there are file
-arguments to :hg:`fix`, the intersection of these patterns is used.
+configured tool. See :hg:`help patterns` for possible values. However, all
+patterns are relative to the repo root, even if that text says they are relative
+to the current working directory. If there are file arguments to :hg:`fix`, the
+intersection of these patterns is used.
 
 There is also a configurable limit for the maximum size of file that will be
 processed by :hg:`fix`::
@@ -140,6 +142,7 b' from mercurial import ('
     context,
     copies,
     error,
+    match as matchmod,
     mdiff,
     merge,
     obsolete,
@@ -843,7 +846,11 b' class Fixer(object):'
 
     def affects(self, opts, fixctx, path):
         """Should this fixer run on the file at the given path and context?"""
-        return scmutil.match(fixctx, [self._pattern], opts)(path)
+        repo = fixctx.repo()
+        matcher = matchmod.match(
+            repo.root, repo.root, [self._pattern], ctx=fixctx
+        )
+        return matcher(path)
 
     def shouldoutputmetadata(self):
         """Should the stdout of this fixer start with JSON and a null byte?"""

tests/test-fix.t

@@ -157,8 +157,10 b' Help text for fix.'
   :skipclean suboption to false.
   
   The :pattern suboption determines which files will be passed through each
-  configured tool. See 'hg help patterns' for possible values. If there are file
-  arguments to 'hg fix', the intersection of these patterns is used.
+  configured tool. See 'hg help patterns' for possible values. However, all
+  patterns are relative to the repo root, even if that text says they are
+  relative to the current working directory. If there are file arguments to 'hg
+  fix', the intersection of these patterns is used.
   
   There is also a configurable limit for the maximum size of file that will be
   processed by 'hg fix':
@@ -1321,7 +1323,7 b' reasonable with that.'
   $ echo modified > bar
   $ hg fix -w bar
   $ cat bar
-  modified
+  $TESTTMP/subprocesscwd
 
   $ cd ../..