files: speed up `hg files` when no flags change display
It's not the first time I see slowness from this command slow down
tools built on top of hg.
The majority of the time is spent merely printing the result before
this change, which is clearly not how it should be (especially since
the computation of the result also looks slow).
Running `hg files` in mozilla-central:
parent revision: 1,260s
this commit: 0,683s
this commit without batching ui.write: 0,931s
this commit replacing the body of the loop with `pass`: 0,566s
This looks like a prime candidate for a rust fast path, but until
then, it seems reasonable to optimize the python.
Differential Revision: https://phab.mercurial-scm.org/D8586
#testcases flat tree
$ . "$TESTDIR/narrow-library.sh"
#if tree
$ cat << EOF >> $HGRCPATH
> [experimental]
> treemanifest = 1
> EOF
#endif
create full repo
$ hg init master
$ cd master
$ mkdir inside
$ echo inside > inside/f1
$ mkdir outside
$ echo outside > outside/f1
$ hg ci -Aqm 'initial'
$ echo modified > inside/f1
$ hg ci -qm 'modify inside'
$ echo modified > outside/f1
$ hg ci -qm 'modify outside'
$ cd ..
$ hg clone --narrow ssh://user@dummy/master narrow --include inside
requesting all changes
adding changesets
adding manifests
adding file changes
added 3 changesets with 2 changes to 1 files
new changesets *:* (glob)
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd narrow
Can show patch touching paths outside
$ hg log -p
changeset: 2:* (glob)
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: modify outside
changeset: 1:* (glob)
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: modify inside
diff -r * -r * inside/f1 (glob)
--- a/inside/f1 Thu Jan 01 00:00:00 1970 +0000
+++ b/inside/f1 Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +1,1 @@
-inside
+modified
changeset: 0:* (glob)
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: initial
diff -r 000000000000 -r * inside/f1 (glob)
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/inside/f1 Thu Jan 01 00:00:00 1970 +0000
@@ -0,0 +1,1 @@
+inside
$ hg status --rev 1 --rev 2
Can show copies inside the narrow clone
$ hg cp inside/f1 inside/f2
$ hg diff --git
diff --git a/inside/f1 b/inside/f2
copy from inside/f1
copy to inside/f2