encoding: fix trim() to be O(n) instead of O(n^2)
`encoding.trim()` iterated over the possible lengths smaller than the
input and created a slice for each. It then calculated the column
width of the result, which is of course O(n), so the overall algorithm
was O(n). This patch rewrites it to iterate over the unicode
characters, keeping track of the length so far. Also, the old
algorithm started from the end of the string, which made it much worse
when the input is large and the limit is small (such as the typical 72
we pass to it).
You can time it by running something like this:
```
time python3 -c 'from mercurial.utils import stringutil; print(stringutil.ellipsis(b"0123456789" * 1000, 5))'
```
That drops from 4.05 s to 83 ms with this patch (and most of that is
of course startup time).
Differential Revision: https://phab.mercurial-scm.org/D12089
$ cat >> $HGRCPATH <<EOF
> [extensions]
> rebase=
>
> [phases]
> publish=False
>
> [alias]
> tglog = log -G --template "{rev}: {node|short} '{desc}' {branches}\n"
> EOF
$ hg init a
$ cd a
$ hg unbundle "$TESTDIR/bundles/rebase.hg"
adding changesets
adding manifests
adding file changes
added 8 changesets with 7 changes to 7 files (+2 heads)
new changesets cd010b8cd998:02de42196ebe (8 drafts)
(run 'hg heads' to see heads, 'hg merge' to merge)
$ hg up tip
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo I > I
$ hg ci -AmI
adding I
$ hg tglog
@ 8: e7ec4e813ba6 'I'
|
o 7: 02de42196ebe 'H'
|
| o 6: eea13746799a 'G'
|/|
o | 5: 24b6387c8c8c 'F'
| |
| o 4: 9520eea781bc 'E'
|/
| o 3: 32af7686d403 'D'
| |
| o 2: 5fddd98957c8 'C'
| |
| o 1: 42ccdea3bb16 'B'
|/
o 0: cd010b8cd998 'A'
$ cd ..
Version with only two heads (to allow default destination to work)
$ hg clone -q -u . a a2heads -r 3 -r 8
These fail:
$ hg clone -q -u . a a0
$ cd a0
$ hg rebase -s 8 -d 7
nothing to rebase
[1]
$ hg rebase --continue --abort
abort: cannot specify both --abort and --continue
[10]
$ hg rebase --continue --collapse
abort: cannot use collapse with continue or abort
[10]
$ hg rebase --continue --dest 4
abort: cannot specify both --continue and --dest
[10]
$ hg rebase --base 5 --source 4
abort: cannot specify both --source and --base
[10]
$ hg rebase --rev 5 --source 4
abort: cannot specify both --rev and --source
[10]
$ hg rebase --base 5 --rev 4
abort: cannot specify both --rev and --base
[10]
$ hg rebase --base 6
abort: branch 'default' has 3 heads - please rebase to an explicit rev
(run 'hg heads .' to see heads, specify destination with -d)
[255]
$ hg rebase --rev '1 & !1' --dest 8
empty "rev" revision set - nothing to rebase
[1]
$ hg rebase --rev 'wdir()' --dest 6
abort: cannot rebase the working copy
[10]
$ hg rebase --source 'wdir()' --dest 6
abort: cannot rebase the working copy
[10]
$ hg rebase --source 1 --source 'wdir()' --dest 6
abort: cannot rebase the working copy
[10]
$ hg rebase --source '1 & !1' --dest 8
empty "source" revision set - nothing to rebase
[1]
$ hg rebase --base '1 & !1' --dest 8
empty "base" revision set - can't compute rebase set
[1]
$ hg rebase --dest 8
nothing to rebase - working directory parent is also destination
[1]
$ hg rebase -b . --dest 8
nothing to rebase - e7ec4e813ba6 is both "base" and destination
[1]
$ hg up -q 7
$ hg rebase --dest 8 --traceback
nothing to rebase - working directory parent is already an ancestor of destination e7ec4e813ba6
[1]
$ hg rebase --dest 8 -b.
nothing to rebase - "base" 02de42196ebe is already an ancestor of destination e7ec4e813ba6
[1]
$ hg rebase --dest '1 & !1'
abort: empty revision set
[10]
These work:
Rebase with no arguments (from 3 onto 8):
$ cd ..
$ hg clone -q -u . a2heads a1
$ cd a1
$ hg up -q -C 3
$ hg rebase
rebasing 1:42ccdea3bb16 "B"
rebasing 2:5fddd98957c8 "C"
rebasing 3:32af7686d403 "D"
saved backup bundle to $TESTTMP/a1/.hg/strip-backup/42ccdea3bb16-3cb021d3-rebase.hg
$ hg tglog
@ 6: ed65089c18f8 'D'
|
o 5: 7621bf1a2f17 'C'
|
o 4: 9430a62369c6 'B'
|
o 3: e7ec4e813ba6 'I'
|
o 2: 02de42196ebe 'H'
|
o 1: 24b6387c8c8c 'F'
|
o 0: cd010b8cd998 'A'
Try to rollback after a rebase (fail):
$ hg rollback
no rollback information available
[1]
$ cd ..
Rebase with base == '.' => same as no arguments (from 3 onto 8):
$ hg clone -q -u 3 a2heads a2
$ cd a2
$ hg rebase --base .
rebasing 1:42ccdea3bb16 "B"
rebasing 2:5fddd98957c8 "C"
rebasing 3:32af7686d403 "D"
saved backup bundle to $TESTTMP/a2/.hg/strip-backup/42ccdea3bb16-3cb021d3-rebase.hg
$ hg tglog
@ 6: ed65089c18f8 'D'
|
o 5: 7621bf1a2f17 'C'
|
o 4: 9430a62369c6 'B'
|
o 3: e7ec4e813ba6 'I'
|
o 2: 02de42196ebe 'H'
|
o 1: 24b6387c8c8c 'F'
|
o 0: cd010b8cd998 'A'
$ cd ..
Rebase with dest == branch(.) => same as no arguments (from 3 onto 8):
$ hg clone -q -u 3 a a3
$ cd a3
$ hg rebase --dest 'branch(.)'
rebasing 1:42ccdea3bb16 "B"
rebasing 2:5fddd98957c8 "C"
rebasing 3:32af7686d403 "D"
saved backup bundle to $TESTTMP/a3/.hg/strip-backup/42ccdea3bb16-3cb021d3-rebase.hg
$ hg tglog
@ 8: ed65089c18f8 'D'
|
o 7: 7621bf1a2f17 'C'
|
o 6: 9430a62369c6 'B'
|
o 5: e7ec4e813ba6 'I'
|
o 4: 02de42196ebe 'H'
|
| o 3: eea13746799a 'G'
|/|
o | 2: 24b6387c8c8c 'F'
| |
| o 1: 9520eea781bc 'E'
|/
o 0: cd010b8cd998 'A'
$ cd ..
Specify only source (from 2 onto 8):
$ hg clone -q -u . a2heads a4
$ cd a4
$ hg rebase --source 'desc("C")'
rebasing 2:5fddd98957c8 "C"
rebasing 3:32af7686d403 "D"
saved backup bundle to $TESTTMP/a4/.hg/strip-backup/5fddd98957c8-f9244fa1-rebase.hg
$ hg tglog
o 6: 7726e9fd58f7 'D'
|
o 5: 72c8333623d0 'C'
|
@ 4: e7ec4e813ba6 'I'
|
o 3: 02de42196ebe 'H'
|
o 2: 24b6387c8c8c 'F'
|
| o 1: 42ccdea3bb16 'B'
|/
o 0: cd010b8cd998 'A'
$ cd ..
Specify only dest (from 3 onto 6):
$ hg clone -q -u 3 a a5
$ cd a5
$ hg rebase --dest 6
rebasing 1:42ccdea3bb16 "B"
rebasing 2:5fddd98957c8 "C"
rebasing 3:32af7686d403 "D"
saved backup bundle to $TESTTMP/a5/.hg/strip-backup/42ccdea3bb16-3cb021d3-rebase.hg
$ hg tglog
@ 8: 8eeb3c33ad33 'D'
|
o 7: 2327fea05063 'C'
|
o 6: e4e5be0395b2 'B'
|
| o 5: e7ec4e813ba6 'I'
| |
| o 4: 02de42196ebe 'H'
| |
o | 3: eea13746799a 'G'
|\|
| o 2: 24b6387c8c8c 'F'
| |
o | 1: 9520eea781bc 'E'
|/
o 0: cd010b8cd998 'A'
$ cd ..
Specify only base (from 1 onto 8):
$ hg clone -q -u . a2heads a6
$ cd a6
$ hg rebase --base 'desc("D")'
rebasing 1:42ccdea3bb16 "B"
rebasing 2:5fddd98957c8 "C"
rebasing 3:32af7686d403 "D"
saved backup bundle to $TESTTMP/a6/.hg/strip-backup/42ccdea3bb16-3cb021d3-rebase.hg
$ hg tglog
o 6: ed65089c18f8 'D'
|
o 5: 7621bf1a2f17 'C'
|
o 4: 9430a62369c6 'B'
|
@ 3: e7ec4e813ba6 'I'
|
o 2: 02de42196ebe 'H'
|
o 1: 24b6387c8c8c 'F'
|
o 0: cd010b8cd998 'A'
$ cd ..
Specify source and dest (from 2 onto 7):
$ hg clone -q -u . a a7
$ cd a7
$ hg rebase --source 2 --dest 7
rebasing 2:5fddd98957c8 "C"
rebasing 3:32af7686d403 "D"
saved backup bundle to $TESTTMP/a7/.hg/strip-backup/5fddd98957c8-f9244fa1-rebase.hg
$ hg tglog
o 8: 668acadedd30 'D'
|
o 7: 09eb682ba906 'C'
|
| @ 6: e7ec4e813ba6 'I'
|/
o 5: 02de42196ebe 'H'
|
| o 4: eea13746799a 'G'
|/|
o | 3: 24b6387c8c8c 'F'
| |
| o 2: 9520eea781bc 'E'
|/
| o 1: 42ccdea3bb16 'B'
|/
o 0: cd010b8cd998 'A'
$ cd ..
Specify base and dest (from 1 onto 7):
$ hg clone -q -u . a a8
$ cd a8
$ hg rebase --base 3 --dest 7
rebasing 1:42ccdea3bb16 "B"
rebasing 2:5fddd98957c8 "C"
rebasing 3:32af7686d403 "D"
saved backup bundle to $TESTTMP/a8/.hg/strip-backup/42ccdea3bb16-3cb021d3-rebase.hg
$ hg tglog
o 8: 287cc92ba5a4 'D'
|
o 7: 6824f610a250 'C'
|
o 6: 7c6027df6a99 'B'
|
| @ 5: e7ec4e813ba6 'I'
|/
o 4: 02de42196ebe 'H'
|
| o 3: eea13746799a 'G'
|/|
o | 2: 24b6387c8c8c 'F'
| |
| o 1: 9520eea781bc 'E'
|/
o 0: cd010b8cd998 'A'
$ cd ..
Specify only revs (from 2 onto 8)
$ hg clone -q -u . a2heads a9
$ cd a9
$ hg rebase --rev 'desc("C")::'
rebasing 2:5fddd98957c8 "C"
rebasing 3:32af7686d403 "D"
saved backup bundle to $TESTTMP/a9/.hg/strip-backup/5fddd98957c8-f9244fa1-rebase.hg
$ hg tglog
o 6: 7726e9fd58f7 'D'
|
o 5: 72c8333623d0 'C'
|
@ 4: e7ec4e813ba6 'I'
|
o 3: 02de42196ebe 'H'
|
o 2: 24b6387c8c8c 'F'
|
| o 1: 42ccdea3bb16 'B'
|/
o 0: cd010b8cd998 'A'
$ cd ..
Rebasing both a single revision and a merge in one command
$ hg clone -q -u . a aX
$ cd aX
$ hg rebase -r 3 -r 6 --dest 8
rebasing 3:32af7686d403 "D"
rebasing 6:eea13746799a "G"
saved backup bundle to $TESTTMP/aX/.hg/strip-backup/eea13746799a-ad273fd6-rebase.hg
$ cd ..
Test --tool parameter:
$ hg init b
$ cd b
$ echo c1 > c1
$ hg ci -Am c1
adding c1
$ echo c2 > c2
$ hg ci -Am c2
adding c2
$ hg up -q 0
$ echo c2b > c2
$ hg ci -Am c2b
adding c2
created new head
$ cd ..
$ hg clone -q -u . b b1
$ cd b1
$ hg rebase -s 2 -d 1 --tool internal:local
rebasing 2:e4e3f3546619 tip "c2b"
note: not rebasing 2:e4e3f3546619 tip "c2b", its destination already has all its changes
saved backup bundle to $TESTTMP/b1/.hg/strip-backup/e4e3f3546619-b0841178-rebase.hg
$ hg cat c2
c2
$ cd ..
$ hg clone -q -u . b b2
$ cd b2
$ hg rebase -s 2 -d 1 --tool internal:other
rebasing 2:e4e3f3546619 tip "c2b"
saved backup bundle to $TESTTMP/b2/.hg/strip-backup/e4e3f3546619-b0841178-rebase.hg
$ hg cat c2
c2b
$ cd ..
$ hg clone -q -u . b b3
$ cd b3
$ hg rebase -s 2 -d 1 --tool internal:fail
rebasing 2:e4e3f3546619 tip "c2b"
unresolved conflicts (see 'hg resolve', then 'hg rebase --continue')
[240]
$ hg summary
parent: 1:56daeba07f4b
c2
branch: default
commit: 1 unresolved (clean)
update: 1 new changesets, 2 branch heads (merge)
phases: 3 draft
rebase: 0 rebased, 1 remaining (rebase --continue)
$ hg resolve -l
U c2
$ hg resolve -m c2
(no more unresolved files)
continue: hg rebase --continue
$ hg graft --continue
abort: no graft in progress
(continue: hg rebase --continue)
[20]
$ hg rebase -c --tool internal:fail
rebasing 2:e4e3f3546619 tip "c2b"
note: not rebasing 2:e4e3f3546619 tip "c2b", its destination already has all its changes
saved backup bundle to $TESTTMP/b3/.hg/strip-backup/e4e3f3546619-b0841178-rebase.hg
$ hg rebase -i
abort: interactive history editing is supported by the 'histedit' extension (see "hg --config extensions.histedit= help -e histedit")
[10]
$ hg rebase --interactive
abort: interactive history editing is supported by the 'histedit' extension (see "hg --config extensions.histedit= help -e histedit")
[10]
$ cd ..
No common ancestor
$ hg init separaterepo
$ cd separaterepo
$ touch a
$ hg commit -Aqm a
$ hg up -q null
$ touch b
$ hg commit -Aqm b
$ hg rebase -d 0
nothing to rebase from d7486e00c6f1 to 3903775176ed
[1]
$ cd ..