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

mkdir t
cd t
hg init

mkdir a
echo foo > a/a
echo bar > a/b

hg add a
hg ci -m "0" -d "0 0"

hg co -C 0
hg mv a b
hg ci -m "1 mv a/ b/" -d "0 0"

hg co -C 0
echo baz > a/c
hg add a/c
hg ci -m "2 add a/c" -d "0 0"

hg merge --debug 1
echo a/* b/*
hg st -C
hg ci -m "3 merge 2+1" -d "0 0"

hg co -C 1
hg merge --debug 2
echo a/* b/*
hg st -C
hg ci -m "4 merge 1+2" -d "0 0"