revlog: add a C implementation of `headrevsdiff`
Python implementation of `headrevsdiff` can be very slow in the worst
case compared with the `heads` computation it replaces, since the
latter is done in C.
Even the average case of this Python implementation is still
noticeable in the profiles.
This patch makes the computation much much faster by doing it in C.
test for old histedit issue #6:
editing a changeset without any actual change would corrupt the repository
$ . "$TESTDIR/histedit-helpers.sh"
$ cat >> $HGRCPATH <<EOF
> [extensions]
> histedit=
> EOF
$ initrepo ()
> {
> dir="$1"
> comment="$2"
> if [ -n "${comment}" ]; then
> echo % ${comment}
> echo % ${comment} | sed 's:.:-:g'
> fi
> hg init ${dir}
> cd ${dir}
> for x in a b c d e f ; do
> echo $x > $x
> hg add $x
> hg ci -m $x
> done
> cd ..
> }
$ geneditor ()
> {
> # generate an editor script for selecting changesets to be edited
> choice=$1 # changesets that should be edited (using sed line ranges)
> cat <<EOF | sed 's:^....::'
> # editing the rules, replacing 'pick' with 'edit' for the chosen lines
> sed '${choice}s:^pick:edit:' "\$1" > "\${1}.tmp"
> mv "\${1}.tmp" "\$1"
> # displaying the resulting rules, minus comments and empty lines
> sed '/^#/d;/^$/d;s:^:| :' "\$1" >&2
> EOF
> }
$ startediting ()
> {
> # begin an editing session
> choice="$1" # changesets that should be edited
> number="$2" # number of changesets considered (from tip)
> comment="$3"
> geneditor "${choice}" > edit.sh
> echo % start editing the history ${comment}
> HGEDITOR="sh ./edit.sh" hg histedit -- -${number} 2>&1 | fixbundle
> }
$ continueediting ()
> {
> # continue an edit already in progress
> editor="$1" # message editor when finalizing editing
> comment="$2"
> echo % finalize changeset editing ${comment}
> HGEDITOR=${editor} hg histedit --continue 2>&1 | fixbundle
> }
$ graphlog ()
> {
> comment="${1:-log}"
> echo % "${comment}"
> hg log -G --template '{rev} {node} \"{desc|firstline}\"\n'
> }
$ initrepo r1 "test editing with no change"
% test editing with no change
-----------------------------
$ cd r1
$ graphlog "log before editing"
% log before editing
@ 5 652413bf663ef2a641cab26574e46d5f5a64a55a "f"
|
o 4 e860deea161a2f77de56603b340ebbb4536308ae "e"
|
o 3 055a42cdd88768532f9cf79daa407fc8d138de9b "d"
|
o 2 177f92b773850b59254aa5e923436f921b55483b "c"
|
o 1 d2ae7f538514cd87c17547b0de4cea71fe1af9fb "b"
|
o 0 cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b "a"
$ startediting 2 3 "(not changing anything)" # edit the 2nd of 3 changesets
% start editing the history (not changing anything)
| pick 055a42cdd887 3 d
| edit e860deea161a 4 e
| pick 652413bf663e 5 f
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
Editing (e860deea161a), commit as needed now to split the change
(to edit e860deea161a, `hg histedit --continue` after making changes)
$ continueediting true "(leaving commit message unaltered)"
% finalize changeset editing (leaving commit message unaltered)
check state of working copy
$ hg id
794fe033d0a0 tip
$ graphlog "log after history editing"
% log after history editing
@ 5 794fe033d0a030f8df77c5de945fca35c9181c30 "f"
|
o 4 04d2fab980779f332dec458cc944f28de8b43435 "e"
|
o 3 055a42cdd88768532f9cf79daa407fc8d138de9b "d"
|
o 2 177f92b773850b59254aa5e923436f921b55483b "c"
|
o 1 d2ae7f538514cd87c17547b0de4cea71fe1af9fb "b"
|
o 0 cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b "a"
$ cd ..
$ initrepo r2 "test editing with no change, then abort"
% test editing with no change, then abort
-----------------------------------------
$ cd r2
$ graphlog "log before editing"
% log before editing
@ 5 652413bf663ef2a641cab26574e46d5f5a64a55a "f"
|
o 4 e860deea161a2f77de56603b340ebbb4536308ae "e"
|
o 3 055a42cdd88768532f9cf79daa407fc8d138de9b "d"
|
o 2 177f92b773850b59254aa5e923436f921b55483b "c"
|
o 1 d2ae7f538514cd87c17547b0de4cea71fe1af9fb "b"
|
o 0 cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b "a"
$ startediting 1,2 3 "(not changing anything)" # edit the 1st two of 3 changesets
% start editing the history (not changing anything)
| edit 055a42cdd887 3 d
| edit e860deea161a 4 e
| pick 652413bf663e 5 f
0 files updated, 0 files merged, 3 files removed, 0 files unresolved
Editing (055a42cdd887), commit as needed now to split the change
(to edit 055a42cdd887, `hg histedit --continue` after making changes)
$ continueediting true "(leaving commit message unaltered)"
% finalize changeset editing (leaving commit message unaltered)
Editing (e860deea161a), commit as needed now to split the change
(to edit e860deea161a, `hg histedit --continue` after making changes)
$ graphlog "log after first edit"
% log after first edit
@ 6 e5ae3ca2f1ffdbd89ec41ebc273a231f7c3022f2 "d"
|
| o 5 652413bf663ef2a641cab26574e46d5f5a64a55a "f"
| |
| o 4 e860deea161a2f77de56603b340ebbb4536308ae "e"
| |
| o 3 055a42cdd88768532f9cf79daa407fc8d138de9b "d"
|/
o 2 177f92b773850b59254aa5e923436f921b55483b "c"
|
o 1 d2ae7f538514cd87c17547b0de4cea71fe1af9fb "b"
|
o 0 cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b "a"
abort editing session, after first forcibly updating away
$ hg up 0
abort: histedit in progress
(use 'hg histedit --continue' or 'hg histedit --abort')
[20]
$ mv .hg/histedit-state .hg/histedit-state-ignore
$ hg up 0
0 files updated, 0 files merged, 3 files removed, 0 files unresolved
$ mv .hg/histedit-state-ignore .hg/histedit-state
$ hg sum
parent: 0:cb9a9f314b8b
a
branch: default
commit: 1 added, 1 unknown (new branch head)
update: 6 new changesets (update)
phases: 7 draft
hist: 2 remaining (histedit --continue)
$ hg histedit --abort 2>&1 | fixbundle
modified files should survive the abort when we've moved away already
$ hg st
A e
? edit.sh
$ graphlog "log after abort"
% log after abort
o 5 652413bf663ef2a641cab26574e46d5f5a64a55a "f"
|
o 4 e860deea161a2f77de56603b340ebbb4536308ae "e"
|
o 3 055a42cdd88768532f9cf79daa407fc8d138de9b "d"
|
o 2 177f92b773850b59254aa5e923436f921b55483b "c"
|
o 1 d2ae7f538514cd87c17547b0de4cea71fe1af9fb "b"
|
@ 0 cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b "a"
aborting and not changing files can skip mentioning updating (no) files
$ hg up
5 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg commit --close-branch -m 'closebranch'
$ startediting 1 1 "(not changing anything)" # edit the 3rd of 3 changesets
% start editing the history (not changing anything)
| edit 292aec348d9e 6 closebranch
Editing (292aec348d9e), commit as needed now to split the change
(to edit 292aec348d9e, `hg histedit --continue` after making changes)
$ hg histedit --abort
$ cd ..