# HG changeset patch
# User Mads Kiilerich <mads@kiilerich.com>
# Date 2010-06-29 10:12:34
# Node ID f786fc4b8764cd2a5526d259cf2f94d8a66924d9
# Parent  eca7f719201bcb5a27312ab7f9505fcc1ee6c1ca

log: follow filenames through renames (issue647)

In commands.log a displayer was initialized from
cmdutil.show_changeset() with the initial matchfn (which designates
the specified files which only is correct in the highest revision in
the range). prep() is handed the correct list of files, but
displayer.show() didn't use that list but keept using the original
matchfn.

The matchfn argument to cmdutil.show_changeset() wasn't specified in
other places and is only used in .show(), so now we give the matchfn
as an optional parameter to .show().

We do however still have to detect --patch and --stat from opts in
show_changeset() and let it imply a matchall, but that can now be
overruled with the new .show() matchfn parameter.

diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -708,15 +708,15 @@ class changeset_printer(object):
         if self.footer:
             self.ui.write(self.footer)
 
-    def show(self, ctx, copies=None, **props):
+    def show(self, ctx, copies=None, matchfn=None, **props):
         if self.buffered:
             self.ui.pushbuffer()
-            self._show(ctx, copies, props)
+            self._show(ctx, copies, matchfn, props)
             self.hunk[ctx.rev()] = self.ui.popbuffer(labeled=True)
         else:
-            self._show(ctx, copies, props)
+            self._show(ctx, copies, matchfn, props)
 
-    def _show(self, ctx, copies, props):
+    def _show(self, ctx, copies, matchfn, props):
         '''show a single changeset or file revision'''
         changenode = ctx.node()
         rev = ctx.rev()
@@ -796,15 +796,17 @@ class changeset_printer(object):
                               label='log.summary')
         self.ui.write("\n")
 
-        self.showpatch(changenode)
+        self.showpatch(changenode, matchfn)
 
-    def showpatch(self, node):
-        if self.patch:
+    def showpatch(self, node, matchfn):
+        if not matchfn:
+            matchfn = self.patch
+        if matchfn:
             stat = self.diffopts.get('stat')
             diffopts = patch.diffopts(self.ui, self.diffopts)
             prev = self.repo.changelog.parents(node)[0]
             diffordiffstat(self.ui, self.repo, diffopts, prev, node,
-                           match=self.patch, stat=stat)
+                           match=matchfn, stat=stat)
             self.ui.write("\n")
 
     def _meaningful_parentrevs(self, log, rev):
@@ -857,7 +859,7 @@ class changeset_templater(changeset_prin
             return []
         return parents
 
-    def _show(self, ctx, copies, props):
+    def _show(self, ctx, copies, matchfn, props):
         '''show a single changeset or file revision'''
 
         showlist = templatekw.showlist
@@ -912,7 +914,7 @@ class changeset_templater(changeset_prin
             # write changeset metadata, then patch if requested
             key = types['changeset']
             self.ui.write(templater.stringify(self.t(key, **props)))
-            self.showpatch(ctx.node())
+            self.showpatch(ctx.node(), matchfn)
 
             if types['footer']:
                 if not self.footer:
@@ -925,7 +927,7 @@ class changeset_templater(changeset_prin
         except SyntaxError, inst:
             raise util.Abort('%s: %s' % (self.t.mapfile, inst.args[0]))
 
-def show_changeset(ui, repo, opts, buffered=False, matchfn=False):
+def show_changeset(ui, repo, opts, buffered=False):
     """show one changeset using template or regular display.
 
     Display format will be the first non-empty hit of:
@@ -939,7 +941,7 @@ def show_changeset(ui, repo, opts, buffe
     # options
     patch = False
     if opts.get('patch') or opts.get('stat'):
-        patch = matchfn or matchall(repo)
+        patch = matchall(repo)
 
     tmpl = opts.get('template')
     style = None
diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -2484,7 +2484,7 @@ def log(ui, repo, *pats, **opts):
     branches = opts.get('branch', []) + opts.get('only_branch', [])
     opts['branch'] = [repo.lookupbranch(b) for b in branches]
 
-    displayer = cmdutil.show_changeset(ui, repo, opts, True, matchfn)
+    displayer = cmdutil.show_changeset(ui, repo, opts, True)
     def prep(ctx, fns):
         rev = ctx.rev()
         parents = [p for p in repo.changelog.parentrevs(rev)
@@ -2517,7 +2517,11 @@ def log(ui, repo, *pats, **opts):
                 if rename:
                     copies.append((fn, rename[0]))
 
-        displayer.show(ctx, copies=copies)
+        revmatchfn = None
+        if opts.get('patch') or opts.get('stat'):
+            revmatchfn = cmdutil.match(repo, fns)
+
+        displayer.show(ctx, copies=copies, matchfn=revmatchfn)
 
     for ctx in cmdutil.walkchangerevs(repo, matchfn, opts, prep):
         if count == limit: