tests/test-mq-safety

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

echo '[extensions]' >> $HGRCPATH
echo 'mq =' >> $HGRCPATH

hg init repo
cd repo

echo foo > foo
hg ci -qAm 'add a file'

hg qinit

hg qnew foo
echo foo >> foo
hg qrefresh -m 'append foo'

hg qnew bar
echo bar >> foo
hg qrefresh -m 'append bar'

echo '% try to commit on top of a patch'
echo quux >> foo
hg ci -m 'append quux'

# cheat a bit...
mv .hg/patches .hg/patches2
hg ci -m 'append quux'
mv .hg/patches2 .hg/patches

echo '% qpop/qrefresh on the wrong revision'
hg qpop
hg qpop -n patches 2>&1 | sed -e 's/\(using patch queue:\).*/\1/'
hg qrefresh

hg up -C qtip
echo '% qpop'
hg qpop

echo '% qrefresh'
hg qrefresh

echo '% tip:'
hg tip --template '{rev} {desc}\n'

echo '% qpush warning branchheads'
cd ..
hg init branchy
cd branchy
echo q > q
hg add q
hg qnew -f qp
hg qpop
echo a > a
hg ci -Ama
hg up null
hg branch b
echo c > c
hg ci -Amc
hg merge default
hg ci -mmerge
hg up default
hg log
hg qpush