templater: pass (context, mapping) down to unwraphybrid()
See the subsequent patches for why.
I initially thought it would be wrong to pass a mapping to flatten() and
stringify() since these functions may be applied to a tree of generators,
where each node should be bound to the mapping when it was evaluated. But,
actually that isn't a problem. If an intermediate node has to override a
mapping dict, it can do on unwraphybrid() and yield "unwrapped" generator
of byte strings:
"{f(g(v))}" # literal template example.
^^^^ # g() want to override a mapping, so it returns a wrapped
# object 'G{V}' with partial mapping 'lm' attached.
^^^^^^^ # f() stringifies 'G{V}', starting from a mapping 'm'.
# when unwrapping 'G{}', it updates 'm' with 'lm', and
# passes it to 'V'.
This structure is important for the formatter (and the hgweb) to build a
static template keyword, which can't access a mapping dict until evaluation
phase.
$ . "$TESTDIR/narrow-library.sh"
$ hg init repo
$ cd repo
$ cat << EOF > .hg/narrowspec
> [includes]
> path:foo
> [excludes]
> EOF
$ echo treemanifest >> .hg/requires
$ echo narrowhg-experimental >> .hg/requires
$ mkdir -p foo/bar
$ echo b > foo/f
$ echo c > foo/bar/f
$ hg commit -Am hi
adding foo/bar/f
adding foo/f
$ hg debugindex -m
rev offset length delta linkrev nodeid p1 p2
0 0 47 -1 0 14a5d056d75a 000000000000 000000000000
$ hg debugindex --dir foo
rev offset length delta linkrev nodeid p1 p2
0 0 77 -1 0 e635c7857aef 000000000000 000000000000
$ hg debugindex --dir foo/
rev offset length delta linkrev nodeid p1 p2
0 0 77 -1 0 e635c7857aef 000000000000 000000000000
$ hg debugindex --dir foo/bar
rev offset length delta linkrev nodeid p1 p2
0 0 44 -1 0 e091d4224761 000000000000 000000000000
$ hg debugindex --dir foo/bar/
rev offset length delta linkrev nodeid p1 p2
0 0 44 -1 0 e091d4224761 000000000000 000000000000
$ hg debugdata -m 0
foo\x00e635c7857aef92ac761ce5741a99da159abbbb24t (esc)
$ hg debugdata --dir foo 0
bar\x00e091d42247613adff5d41b67f15fe7189ee97b39t (esc)
f\x001e88685f5ddec574a34c70af492f95b6debc8741 (esc)
$ hg debugdata --dir foo/ 0
bar\x00e091d42247613adff5d41b67f15fe7189ee97b39t (esc)
f\x001e88685f5ddec574a34c70af492f95b6debc8741 (esc)
$ hg debugdata --dir foo/bar 0
f\x00149da44f2a4e14f488b7bd4157945a9837408c00 (esc)
$ hg debugdata --dir foo/bar/ 0
f\x00149da44f2a4e14f488b7bd4157945a9837408c00 (esc)