tests/test-annotate

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

HGMERGE=true; export HGMERGE

echo % init
hg init

echo % commit
echo 'a' > a
hg ci -A -m test -u nobody -d '1 0'

echo % annotate -c
hg annotate -c a

echo % annotate -cl
hg annotate -cl a

echo % annotate -d
hg annotate -d a

echo % annotate -n
hg annotate -n a

echo % annotate -nl
hg annotate -nl a

echo % annotate -u
hg annotate -u a

echo % annotate -cdnu
hg annotate -cdnu a

echo % annotate -cdnul
hg annotate -cdnul a

cat <<EOF >>a
a
a
EOF
hg ci -ma1 -d '1 0'
hg cp a b
hg ci -mb -d '1 0'
cat <<EOF >> b
b4
b5
b6
EOF
hg ci -mb2 -d '2 0'

echo % annotate -n b
hg annotate -n b
echo % annotate --no-follow b
hg annotate --no-follow b
echo % annotate -nl b
hg annotate -nl b
echo % annotate -nf b
hg annotate -nf b
echo % annotate -nlf b
hg annotate -nlf b

hg up -C 2
cat <<EOF >> b
b4
c
b5
EOF
hg ci -mb2.1 -d '2 0'
hg merge
hg ci -mmergeb -d '3 0'
echo % annotate after merge
hg annotate -nf b
echo % annotate after merge with -l
hg annotate -nlf b

hg up -C 1
hg cp a b
cat <<EOF > b
a
z
a
EOF
hg ci -mc -d '3 0'
hg merge
cat <<EOF >> b
b4
c
b5
EOF
echo d >> b
hg ci -mmerge2 -d '4 0'
echo % annotate after rename merge
hg annotate -nf b
echo % annotate after rename merge with -l
hg annotate -nlf b

echo % linkrev vs rev
hg annotate -r tip -n a
echo % linkrev vs rev with -l
hg annotate -r tip -nl a

# test issue 589
# annotate was crashing when trying to --follow something
# like A -> B -> A
echo % generate ABA rename configuration
echo foo > foo
hg add foo
hg ci -m addfoo
hg rename foo bar
hg ci -m renamefoo
hg rename bar foo
hg ci -m renamebar

echo % annotate after ABA with follow
hg annotate --follow foo