tests/test-remove

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

remove() {
    hg rm $@
    hg st
    # do not use ls -R, which recurses in .hg subdirs on Mac OS X 10.5
    find . -name .hg -prune -o -type f -print | sort
    hg up -C
}

hg init a
cd a
echo a > foo

echo % file not managed
remove foo

hg add foo
hg commit -m1

# the table cases

echo % 00 state added, options none
echo b > bar
hg add bar
remove bar

echo % 01 state clean, options none
remove foo

echo % 02 state modified, options none
echo b >> foo
remove foo

echo % 03 state missing, options none
rm foo
remove foo

echo % 10 state added, options -f
echo b > bar
hg add bar
remove -f bar
rm bar

echo % 11 state clean, options -f
remove -f foo

echo % 12 state modified, options -f
echo b >> foo
remove -f foo

echo % 13 state missing, options -f
rm foo
remove -f foo

echo % 20 state added, options -A
echo b > bar
hg add bar
remove -A bar

echo % 21 state clean, options -A
remove -A foo

echo % 22 state modified, options -A
echo b >> foo
remove -A foo

echo % 23 state missing, options -A
rm foo
remove -A foo

echo % 30 state added, options -Af
echo b > bar
hg add bar
remove -Af bar
rm bar

echo % 31 state clean, options -Af
remove -Af foo

echo % 32 state modified, options -Af
echo b >> foo
remove -Af foo

echo % 33 state missing, options -Af
rm foo
remove -Af foo

# test some directory stuff

mkdir test
echo a > test/foo
echo b > test/bar
hg ci -Am2

echo % dir, options none
rm test/bar
remove test

echo % dir, options -f
rm test/bar
remove -f test

echo % dir, options -A
rm test/bar
remove -A test

echo % dir, options -Af
rm test/bar
remove -Af test

echo 'test remove dropping empty trees (issue1861)'
mkdir -p issue1861/b/c
echo x > issue1861/x
echo y > issue1861/b/c/y
hg ci -Am add
hg rm issue1861/b
hg ci -m remove
ls issue1861