#!/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 -C

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