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
#testcases filelog compatibility changeset sidedata
$ cat >> $HGRCPATH << EOF
> [extensions]
> rebase=
> [alias]
> l = log -G -T '{rev} {desc}\n{files}\n'
> EOF
#if compatibility
$ cat >> $HGRCPATH << EOF
> [experimental]
> copies.read-from = compatibility
> EOF
#endif
#if changeset
$ cat >> $HGRCPATH << EOF
> [experimental]
> copies.read-from = changeset-only
> copies.write-to = changeset-only
> EOF
#endif
#if sidedata
$ cat >> $HGRCPATH << EOF
> [format]
> exp-use-copies-side-data-changeset = yes
> EOF
#endif
$ REPONUM=0
$ newrepo() {
> cd $TESTTMP
> REPONUM=`expr $REPONUM + 1`
> hg init repo-$REPONUM
> cd repo-$REPONUM
> }
Copy a file, then delete destination, then copy again. This does not create a new filelog entry.
$ newrepo
$ echo x > x
$ hg ci -Aqm 'add x'
$ echo x2 > x
$ hg ci -m 'modify x'
$ hg co -q 0
$ hg cp x y
$ hg ci -qm 'copy x to y'
$ hg rm y
$ hg ci -m 'remove y'
$ hg cp -f x y
$ hg ci -m 'copy x onto y (again)'
$ hg l
@ 4 copy x onto y (again)
| y
o 3 remove y
| y
o 2 copy x to y
| y
| o 1 modify x
|/ x
o 0 add x
x
$ hg debugp1copies -r 4
x -> y
$ hg debugpathcopies 0 4
x -> y
$ hg graft -r 1
grafting 1:* "modify x" (glob)
merging y and x to y
$ hg co -qC 1
$ hg graft -r 4
grafting 4:* "copy x onto y (again)" (glob)
merging x and y to y
Copy x to y, then remove y, then add back y. With copy metadata in the
changeset, this could easily end up reporting y as copied from x (if we don't
unmark it as a copy when it's removed). Despite x and y not being related, we
want grafts to propagate across the rename.
$ newrepo
$ echo x > x
$ hg ci -Aqm 'add x'
$ echo x2 > x
$ hg ci -m 'modify x'
$ hg co -q 0
$ hg mv x y
$ hg ci -qm 'rename x to y'
$ hg rm y
$ hg ci -qm 'remove y'
$ echo x > y
$ hg ci -Aqm 'add back y'
$ hg l
@ 4 add back y
| y
o 3 remove y
| y
o 2 rename x to y
| x y
| o 1 modify x
|/ x
o 0 add x
x
$ hg debugpathcopies 0 4
BROKEN: This should succeed and merge the changes from x into y
$ hg graft -r 1
grafting 1:* "modify x" (glob)
file 'x' was deleted in local [local] but was modified in other [graft].
You can use (c)hanged version, leave (d)eleted, or leave (u)nresolved.
What do you want to do? u
abort: unresolved conflicts, can't continue
(use 'hg resolve' and 'hg graft --continue')
[1]
Add x, remove it, then add it back, then rename x to y. Similar to the case
above, but here the break in history is before the rename.
$ newrepo
$ echo x > x
$ hg ci -Aqm 'add x'
$ echo x2 > x
$ hg ci -m 'modify x'
$ hg co -q 0
$ hg rm x
$ hg ci -qm 'remove x'
$ echo x > x
$ hg ci -Aqm 'add x again'
$ hg mv x y
$ hg ci -m 'rename x to y'
$ hg l
@ 4 rename x to y
| x y
o 3 add x again
| x
o 2 remove x
| x
| o 1 modify x
|/ x
o 0 add x
x
$ hg debugpathcopies 0 4
x -> y
$ hg graft -r 1
grafting 1:* "modify x" (glob)
merging y and x to y
$ hg co -qC 1
$ hg graft -r 4
grafting 4:* "rename x to y" (glob)
merging x and y to y
Add x, modify it, remove it, then add it back, then rename x to y. Similar to
the case above, but here the re-added file's nodeid is different from before
the break.
$ newrepo
$ echo x > x
$ hg ci -Aqm 'add x'
$ echo x2 > x
$ hg ci -m 'modify x'
$ echo x3 > x
$ hg ci -qm 'modify x again'
$ hg co -q 1
$ hg rm x
$ hg ci -qm 'remove x'
# Same content to avoid conflicts
$ hg revert -r 1 x
$ hg ci -Aqm 'add x again'
$ hg mv x y
$ hg ci -m 'rename x to y'
$ hg l
@ 5 rename x to y
| x y
o 4 add x again
| x
o 3 remove x
| x
| o 2 modify x again
|/ x
o 1 modify x
| x
o 0 add x
x
$ hg debugpathcopies 0 5
x -> y (no-filelog !)
#if no-filelog
$ hg graft -r 2
grafting 2:* "modify x again" (glob)
merging y and x to y
#else
BROKEN: This should succeed and merge the changes from x into y
$ hg graft -r 2
grafting 2:* "modify x again" (glob)
file 'x' was deleted in local [local] but was modified in other [graft].
You can use (c)hanged version, leave (d)eleted, or leave (u)nresolved.
What do you want to do? u
abort: unresolved conflicts, can't continue
(use 'hg resolve' and 'hg graft --continue')
[1]
#endif
$ hg co -qC 2
BROKEN: This should succeed and merge the changes from x into y
$ hg graft -r 5
grafting 5:* "rename x to y"* (glob)
file 'x' was deleted in other [graft] but was modified in local [local].
You can use (c)hanged version, (d)elete, or leave (u)nresolved.
What do you want to do? u
abort: unresolved conflicts, can't continue
(use 'hg resolve' and 'hg graft --continue')
[1]
Add x, remove it, then add it back, rename x to y from the first commit.
Similar to the case above, but here the break in history is parallel to the
rename.
$ newrepo
$ echo x > x
$ hg ci -Aqm 'add x'
$ hg rm x
$ hg ci -qm 'remove x'
$ echo x > x
$ hg ci -Aqm 'add x again'
$ echo x2 > x
$ hg ci -m 'modify x'
$ hg co -q 0
$ hg mv x y
$ hg ci -qm 'rename x to y'
$ hg l
@ 4 rename x to y
| x y
| o 3 modify x
| | x
| o 2 add x again
| | x
| o 1 remove x
|/ x
o 0 add x
x
$ hg debugpathcopies 2 4
x -> y
$ hg graft -r 3
grafting 3:* "modify x" (glob)
merging y and x to y
$ hg co -qC 3
$ hg graft -r 4
grafting 4:* "rename x to y" (glob)
merging x and y to y
Add x, remove it, then add it back, rename x to y from the first commit.
Similar to the case above, but here the re-added file's nodeid is different
from the base.
$ newrepo
$ echo x > x
$ hg ci -Aqm 'add x'
$ hg rm x
$ hg ci -qm 'remove x'
$ echo x2 > x
$ hg ci -Aqm 'add x again with different content'
$ hg co -q 0
$ hg mv x y
$ hg ci -qm 'rename x to y'
$ hg l
@ 3 rename x to y
| x y
| o 2 add x again with different content
| | x
| o 1 remove x
|/ x
o 0 add x
x
$ hg debugpathcopies 2 3
x -> y
BROKEN: This should merge the changes from x into y
$ hg graft -r 2
grafting 2:* "add x again with different content" (glob)
$ hg co -qC 2
BROKEN: This should succeed and merge the changes from x into y
$ hg graft -r 3
grafting 3:* "rename x to y" (glob)
file 'x' was deleted in other [graft] but was modified in local [local].
You can use (c)hanged version, (d)elete, or leave (u)nresolved.
What do you want to do? u
abort: unresolved conflicts, can't continue
(use 'hg resolve' and 'hg graft --continue')
[1]
Add x on two branches, then rename x to y on one side. Similar to the case
above, but here the break in history is via the base commit.
$ newrepo
$ echo a > a
$ hg ci -Aqm 'base'
$ echo x > x
$ hg ci -Aqm 'add x'
$ echo x2 > x
$ hg ci -m 'modify x'
$ hg co -q 0
$ echo x > x
$ hg ci -Aqm 'add x again'
$ hg mv x y
$ hg ci -qm 'rename x to y'
$ hg l
@ 4 rename x to y
| x y
o 3 add x again
| x
| o 2 modify x
| | x
| o 1 add x
|/ x
o 0 base
a
$ hg debugpathcopies 1 4
x -> y
$ hg graft -r 2
grafting 2:* "modify x" (glob)
merging y and x to y
$ hg co -qC 2
$ hg graft -r 4
grafting 4:* "rename x to y"* (glob)
merging x and y to y
Add x on two branches, with same content but different history, then rename x
to y on one side. Similar to the case above, here the file's nodeid is
different between the branches.
$ newrepo
$ echo a > a
$ hg ci -Aqm 'base'
$ echo x > x
$ hg ci -Aqm 'add x'
$ echo x2 > x
$ hg ci -m 'modify x'
$ hg co -q 0
$ touch x
$ hg ci -Aqm 'add empty x'
# Same content to avoid conflicts
$ hg revert -r 1 x
$ hg ci -m 'modify x to match commit 1'
$ hg mv x y
$ hg ci -qm 'rename x to y'
$ hg l
@ 5 rename x to y
| x y
o 4 modify x to match commit 1
| x
o 3 add empty x
| x
| o 2 modify x
| | x
| o 1 add x
|/ x
o 0 base
a
$ hg debugpathcopies 1 5
x -> y (no-filelog !)
#if no-filelog
$ hg graft -r 2
grafting 2:* "modify x" (glob)
merging y and x to y
#else
BROKEN: This should succeed and merge the changes from x into y
$ hg graft -r 2
grafting 2:* "modify x" (glob)
file 'x' was deleted in local [local] but was modified in other [graft].
You can use (c)hanged version, leave (d)eleted, or leave (u)nresolved.
What do you want to do? u
abort: unresolved conflicts, can't continue
(use 'hg resolve' and 'hg graft --continue')
[1]
#endif
$ hg co -qC 2
BROKEN: This should succeed and merge the changes from x into y
$ hg graft -r 5
grafting 5:* "rename x to y"* (glob)
file 'x' was deleted in other [graft] but was modified in local [local].
You can use (c)hanged version, (d)elete, or leave (u)nresolved.
What do you want to do? u
abort: unresolved conflicts, can't continue
(use 'hg resolve' and 'hg graft --continue')
[1]
Copies via null revision (there shouldn't be any)
$ newrepo
$ echo x > x
$ hg ci -Aqm 'add x'
$ hg cp x y
$ hg ci -m 'copy x to y'
$ hg co -q null
$ echo x > x
$ hg ci -Aqm 'add x (again)'
$ hg l
@ 2 add x (again)
x
o 1 copy x to y
| y
o 0 add x
x
$ hg debugpathcopies 1 2
$ hg debugpathcopies 2 1
$ hg graft -r 1
grafting 1:* "copy x to y" (glob)
Copies involving a merge of multiple roots.
$ newrepo
$ echo a > a
$ hg ci -Aqm 'add a'
$ echo a >> a
$ hg ci -Aqm 'update a'
$ echo a >> a
$ hg ci -Aqm 'update a'
$ hg up null
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo b > a
$ hg ci -Aqm 'add a'
$ hg mv a b
$ hg ci -Aqm 'move a to b'
$ echo b >> b
$ hg ci -Aqm 'update b'
$ hg merge 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg ci -m "merge with other branch"
$ echo a >> a
$ echo a >> a
$ echo b >> b
$ hg ci -Aqm 'update a and b'
$ hg l
@ 7 update a and b
| a b
o 6 merge with other branch
|\
| o 5 update b
| | b
| o 4 move a to b
| | a b
| o 3 add a
| a
| o 2 update a
| | a
| o 1 update a
|/ a
o 0 add a
a
$ hg cat a -r 7
a
a
a
$ hg cat a -r 2
a
a
a
$ hg cat a -r 0
a
$ hg debugpathcopies 7 2
$ hg debugpathcopies 2 7
$ hg merge 2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)