Add dirstate.pathto and localrepo.pathto. Every time util.pathto is called, we have to pass the repo root and the repo cwd. dirstate.pathto is a simple convenience function that knows about the root and the cwd arguments. It's still possible to pass the cwd as an optimization. localrepo.pathto is a convenience function that just calls dirstate.pathto, just like localrepo.getcwd. dirstate.pathto becomes a single point that converts most (all?) paths from the internal representation to some OS-specific relative path for display purposes.

#!/bin/sh

hg init

cat > .hg/hgrc <<EOF
[encode]
*.gz = gunzip

[decode]
*.gz = gzip

EOF

echo "this is a test" | gzip > a.gz
hg add a.gz
hg ci -m "test" -d "1000000 0"
echo %% no changes
hg status
touch a.gz

echo %% no changes
hg status

echo %% uncompressed contents in repo
hg debugdata .hg/store/data/a.gz.d 0

echo %% uncompress our working dir copy
gunzip < a.gz

rm a.gz
hg co

echo %% uncompress our new working dir copy
gunzip < a.gz