templatekw: compare target context and its parent exactly (issue4690)

Before this patch, template keywords `{file_mods}`, `{file_adds}` and
`{file_dels}` use values gotten by `repo.status(ctx.p1().node(),
ctx.node())`.

But this doesn't work as expected if `ctx` is `memctx` or
`workingcommitctx`. Typical case of templating with these contexts is
customization of the text shown in the commit message editor by
`[committemplate]` configuration.

In this case, `ctx.node()` returns None and it causes comparison
between `ctx.p1()` and `workingctx`. `workingctx` lists up all changed
files in the working directory even at selective committing.

BTW, `{files}` uses `ctx.files()` and it works as expected.

To compare target context and its parent exactly, this patch passes
`ctx.p1()` and `ctx` without `node()`-nize. This avoids unexpected
comparison with `workingctx`.

This patch uses a little redundant template configurations in
`test-commit.t`, but they are needed to avoid regression around
problems fixed by a4958cdb2202 and 1e6fb8db666e: accessing on `ctx`
may break `ctx._status` field.

mercurial/templatekw.py

@@ -111,7 +111,7 b' def _showlist(name, values, plural=None,'
 
 def getfiles(repo, ctx, revcache):
     if 'files' not in revcache:
-        revcache['files'] = repo.status(ctx.p1().node(), ctx.node())[:3]
+        revcache['files'] = repo.status(ctx.p1(), ctx)[:3]
     return revcache['files']
 
 def getlatesttags(repo, ctx, cache):

tests/test-commit-amend.t

@@ -1000,6 +1000,37 b' Test that "diff()" in committemplate wor'
   HG: @@ -0,0 +1,1 @@
   HG: +y
 
+  $ echo cccc >> cc
+  $ hg status -amr
+  M cc
+  $ HGEDITOR=cat hg commit --amend -e -m "cc should be excluded" -X cc
+  cc should be excluded
+  
+  HG: M: 
+  HG: A: foo y
+  HG: R: a x
+  HG: diff -r 6de0c1bde1c8 a
+  HG: --- a/a	Thu Jan 01 00:00:00 1970 +0000
+  HG: +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
+  HG: @@ -1,2 +0,0 @@
+  HG: -a
+  HG: -a
+  HG: diff -r 6de0c1bde1c8 foo
+  HG: --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+  HG: +++ b/foo	Thu Jan 01 00:00:00 1970 +0000
+  HG: @@ -0,0 +1,1 @@
+  HG: +foo
+  HG: diff -r 6de0c1bde1c8 x
+  HG: --- a/x	Thu Jan 01 00:00:00 1970 +0000
+  HG: +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
+  HG: @@ -1,1 +0,0 @@
+  HG: -x
+  HG: diff -r 6de0c1bde1c8 y
+  HG: --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+  HG: +++ b/y	Thu Jan 01 00:00:00 1970 +0000
+  HG: @@ -0,0 +1,1 @@
+  HG: +y
+
 Check for issue4405
 -------------------
 

tests/test-commit.t

@@ -441,10 +441,16 b' specific template keywords work well'
   $ cat >> .hg/hgrc <<EOF
   > [committemplate]
   > changeset = {desc}
+  >     HG: mods={file_mods}
+  >     HG: adds={file_adds}
+  >     HG: dels={file_dels}
   >     HG: files={files}
   >     HG:
   >     {splitlines(diff()) % 'HG: {line}\n'
   >    }HG:
+  >     HG: mods={file_mods}
+  >     HG: adds={file_adds}
+  >     HG: dels={file_dels}
   >     HG: files={files}\n
   > EOF
   $ hg status -amr
@@ -453,6 +459,9 b' specific template keywords work well'
   R removed
   $ HGEDITOR=cat hg commit -q -e -m "foo bar" changed
   foo bar
+  HG: mods=changed
+  HG: adds=
+  HG: dels=
   HG: files=changed
   HG:
   HG: --- a/changed	Thu Jan 01 00:00:00 1970 +0000
@@ -461,6 +470,9 b' specific template keywords work well'
   HG:  changed
   HG: +changed
   HG:
+  HG: mods=changed
+  HG: adds=
+  HG: dels=
   HG: files=changed
   $ hg status -amr
   A added
@@ -474,25 +486,43 b' specific template keywords work well'
   $ cat >> .hg/hgrc <<EOF
   > [committemplate]
   > changeset = {desc}
+  >     HG: mods={file_mods}
+  >     HG: adds={file_adds}
+  >     HG: dels={file_dels}
   >     HG: files={files}
   >     HG:
   >     {splitlines(diff("changed")) % 'HG: {line}\n'
   >    }HG:
+  >     HG: mods={file_mods}
+  >     HG: adds={file_adds}
+  >     HG: dels={file_dels}
   >     HG: files={files}
   >     HG:
   >     {splitlines(diff("added")) % 'HG: {line}\n'
   >    }HG:
+  >     HG: mods={file_mods}
+  >     HG: adds={file_adds}
+  >     HG: dels={file_dels}
   >     HG: files={files}
   >     HG:
   >     {splitlines(diff("removed")) % 'HG: {line}\n'
   >    }HG:
+  >     HG: mods={file_mods}
+  >     HG: adds={file_adds}
+  >     HG: dels={file_dels}
   >     HG: files={files}\n
   > EOF
   $ HGEDITOR=cat hg commit -q -e -m "foo bar" added removed
   foo bar
+  HG: mods=
+  HG: adds=added
+  HG: dels=removed
   HG: files=added removed
   HG:
   HG:
+  HG: mods=
+  HG: adds=added
+  HG: dels=removed
   HG: files=added removed
   HG:
   HG: --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -500,6 +530,9 b' specific template keywords work well'
   HG: @@ -0,0 +1,1 @@
   HG: +added
   HG:
+  HG: mods=
+  HG: adds=added
+  HG: dels=removed
   HG: files=added removed
   HG:
   HG: --- a/removed	Thu Jan 01 00:00:00 1970 +0000
@@ -507,6 +540,9 b' specific template keywords work well'
   HG: @@ -1,1 +0,0 @@
   HG: -removed
   HG:
+  HG: mods=
+  HG: adds=added
+  HG: dels=removed
   HG: files=added removed
   $ hg status -amr
   M changed