tests/test-custom-filters

Strip filter name from command before passing to filter function.

The new registration of in-process data filters (introduced in
f8ad3b76e923 & 11af38a592ae) failed to correctly strip the filter name
from its arguments before passing the "command" to the filter
function. Thus a registration such as

[decode]
*.gz = compress: -9

would result in the associated filter function being called with the
argument 'compress: -9' rather than just '-9' as expected.

#!/bin/sh

hg init

cat > .hg/hgrc <<EOF
[extensions]
prefixfilter = prefix.py
[encode]
*.txt = stripprefix: Copyright 2046, The Masters
[decode]
*.txt = insertprefix: Copyright 2046, The Masters
EOF

cat > prefix.py <<EOF
from mercurial import util
def stripprefix(s, cmd, filename, **kwargs):
    header = '%s\n' % cmd
    if s[:len(header)] != header:
        raise util.Abort('missing header "%s" in %s' % (cmd, filename))
    return s[len(header):]
def insertprefix(s, cmd):
    return '%s\n%s' % (cmd, s)
def reposetup(ui, repo):
    repo.adddatafilter('stripprefix:', stripprefix)
    repo.adddatafilter('insertprefix:', insertprefix)
EOF

cat > .hgignore <<EOF
.hgignore
prefix.py
prefix.pyc
EOF

cat > stuff.txt <<EOF
Copyright 2046, The Masters
Some stuff to ponder very carefully.
EOF
hg add stuff.txt
hg ci -m stuff

echo '% Repository data:'
hg cat stuff.txt

echo '% Fresh checkout:'
rm stuff.txt
hg up
cat stuff.txt
echo >> stuff.txt <<EOF
Very very carefully.
EOF
hg stat

cat > morestuff.txt <<EOF
Unauthorized material subject to destruction.
EOF

echo '% Problem encoding:'
hg add morestuff.txt
hg ci -m morestuff
hg stat