Mercurial > hg
view tests/test-pull-permission.t @ 36672:9e7b14caf67f
xdiff: remove patience and histogram diff algorithms
Patience diff is the normal diff algorithm, plus some greediness that
unconditionally matches common common unique lines. That means it is easy to
construct cases to let it generate suboptimal result, like:
```
open('a', 'w').write('\n'.join(list('a' + 'x' * 300 + 'u' + 'x' * 700 + 'a\n')))
open('b', 'w').write('\n'.join(list('b' + 'x' * 700 + 'u' + 'x' * 300 + 'b\n')))
```
Patience diff has been advertised as being able to generate better results for
some C code changes. However, the more scientific way to do that is the
indention heuristic [1].
Since patience diff could generate suboptimal result more easily and its
"better" diff feature could be replaced by the new indention heuristic, let's
just remove it and its variant histogram diff to simplify the code.
[1]: https://github.com/git/git/commit/433860f3d0beb0c6f205290bd16cda413148f098
Test Plan:
`gcc -fPIC *.c --shared -o xdiff.so` still builds.
Differential Revision: https://phab.mercurial-scm.org/D2573
author | Jun Wu <quark@fb.com> |
---|---|
date | Sat, 03 Mar 2018 10:39:55 -0800 |
parents | eb586ed5d8ce |
children | f1186c292d03 |
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#require unix-permissions no-root $ hg init a $ cd a $ echo foo > b $ hg add b $ hg ci -m "b" $ chmod -w .hg/store $ cd .. $ hg clone a b requesting all changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files new changesets 97310831fa1a updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ chmod +w a/.hg/store # let test clean up $ cd b $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 1 changesets, 1 total revisions $ cd ..