tests/test-mq-git

findrenames: Optimise "addremove -s100" by matching files by their SHA1 hashes.

We speed up 'findrenames' for the usecase when a user specifies they
want a similarity of 100% by matching files by their exact SHA1 hash
value. This reduces the number of comparisons required to find exact
matches from O(n^2) to O(n).

While it would be nice if we could just use mercurial's pre-calculated
SHA1 hash for existing files, this hash includes the file's ancestor
information making it unsuitable for our purposes. Instead, we calculate
the hash of old content from scratch.

The following benchmarks were taken on the current head of crew:

addremove 100% similarity:
  rm -rf *; hg up -C; mv tests tests.new
  hg --time addremove -s100 --dry-run

  before:  real 176.350 secs (user 128.890+0.000 sys 47.430+0.000)
  after:   real   2.130 secs (user   1.890+0.000 sys  0.240+0.000)

addremove 75% similarity:
  rm -rf *; hg up -C; mv tests tests.new; \
      for i in tests.new/*; do echo x >> $i; done
  hg --time addremove -s75  --dry-run

  before: real 264.560 secs (user 215.130+0.000 sys 49.410+0.000)
  after:  real 218.710 secs (user 172.790+0.000 sys 45.870+0.000)

#!/bin/sh

# Test the plumbing of mq.git option
# Automatic upgrade itself is tested elsewhere.

echo "[extensions]" >> $HGRCPATH
echo "mq=" >> $HGRCPATH
echo "[diff]" >> $HGRCPATH
echo "nodates=1" >> $HGRCPATH

hg init repo-auto
cd repo-auto
echo '% git=auto: regular patch creation'
echo a > a
hg add a
hg qnew -d '0 0' -f adda
cat .hg/patches/adda
echo '% git=auto: git patch creation with copy'
hg cp a b
hg qnew -d '0 0' -f copy
cat .hg/patches/copy
echo '% git=auto: git patch when using --git'
echo regular > regular
hg add regular
hg qnew -d '0 0' --git -f git
cat .hg/patches/git
echo '% git=auto: regular patch after qrefresh without --git'
hg qrefresh -d '0 0'
cat .hg/patches/git
cd ..

hg init repo-keep
cd repo-keep
echo '[mq]' > .hg/hgrc
echo 'git = KEEP' >> .hg/hgrc
echo '% git=keep: git patch with --git'
echo a > a
hg add a
hg qnew -d '0 0' -f --git git
cat .hg/patches/git
echo '% git=keep: git patch after qrefresh without --git'
echo a >> a
hg qrefresh -d '0 0'
cat .hg/patches/git
cd ..

hg init repo-yes
cd repo-yes
echo '[mq]' > .hg/hgrc
echo 'git = yes' >> .hg/hgrc
echo '% git=yes: git patch'
echo a > a
hg add a
hg qnew -d '0 0' -f git
cat .hg/patches/git
echo '% git=yes: git patch after qrefresh'
echo a >> a
hg qrefresh -d '0 0'
cat .hg/patches/git
cd ..

hg init repo-no
cd repo-no
echo '[diff]' > .hg/hgrc
echo 'git = True' >> .hg/hgrc
echo '[mq]' > .hg/hgrc
echo 'git = False' >> .hg/hgrc
echo '% git=no: regular patch with copy'
echo a > a
hg add a
hg qnew -d '0 0' -f adda
hg cp a b
hg qnew -d '0 0' -f regular
cat .hg/patches/regular
echo '% git=no: regular patch after qrefresh with copy'
hg cp a c
hg qrefresh -d '0 0'
cat .hg/patches/regular
cd ..