Add symlink method to util.opener. Differences from os.symlink: - the symlink name is relative to the opener base directory - if a file with that name already exists, it's removed - if necessary, parent directories are created - if the system (OS or filesystem) doesn't support symlinks, a regular file is created. Its contents are the symlink target.

#!/bin/sh
# test command parsing and dispatch

hg init a
cd a
echo a > a
hg ci -Ama -d '0 0'

echo "# missing arg"
hg cat

echo '% [defaults]'
hg cat a
cat > $HGRCPATH <<EOF
[defaults]
cat = -v
EOF
hg cat a

echo '% no repo'
cd ..
hg cat

exit 0