Mutex files with preprocessing

mfwpp

#!/bin/sh

# Generate all .m4 file outputs - being lazy and just re-running the script
# with an argument. To be safe AND lazy, add a useless argument just to make
# sure this doesn't fork bomb me some day if I change how this is done.
if [ -z "$1" ]; then
	exec find $(dirname -- "$0") -name '*.m4' -exec "./$0" '{}' 'safety' \;
fi

# Generate $1 from its .m4 file.

# Piping this program into .gitignore is a good idea
echo "${1%.m4}"
m4 --prefix-builtins - "$1" > "${1%.m4}" << 'EOF'
m4_define(HOST, m4_esyscmd(`echo -n $(hostname)'))
m4_define(`if_host', `m4_ifelse(HOST, $1, $2, $3)')
EOF