tests/test-alias

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

cat >> $HGRCPATH <<EOF
[alias]
myinit = init
cleanstatus = status -c
unknown = bargle
ambiguous = s
recursive = recursive
nodefinition =
mylog = log
lognull = log -r null
shortlog = log --template '{rev} {node|short} | {date|isodate}\n'
dln = lognull --debug
nousage = rollback
put = export -r 0 -o "\$PWD/%R.diff"

[defaults]
mylog = -q
lognull = -q
log = -v
EOF

echo '% basic'
hg myinit alias

echo '% unknown'
hg unknown
hg help unknown

echo '% ambiguous'
hg ambiguous
hg help ambiguous

echo '% recursive'
hg recursive
hg help recursive

echo '% no definition'
hg nodef
hg help nodef

cd alias

echo '% no usage'
hg nousage

echo foo > foo
hg ci -Amfoo

echo '% with opts'
hg cleanst

echo '% with opts and whitespace'
hg shortlog

echo '% interaction with defaults'
hg mylog
hg lognull

echo '% properly recursive'
hg dln

echo '% path expanding'
hg put
cat 0.diff