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# Replace the first instance of the first argument string with the second
# argument string in $PWD, and make that the target of the cd builtin. This is
# to emulate a feature of the `cd` builtin in Zsh that I like, but that I think
# should be a separate command rather than overloading `cd`.
#
# $ pwd
# /usr/local/bin
# $ rd local
# $ pwd
# /usr/bin
# $ rd usr opt
# $ pwd
# /opt/bin
rd() {
# Check argument count
case $# in
1|2) ;;
*)
printf >&2 \
'rd(): Need a string and optionally a replacement\n'
return 2
;;
esac
# Check there's something to substitute, and do it
case $PWD in
*"$1"*)
set -- "${PWD%%"$1"*}""$2""${PWD#*"$1"}"
;;
*)
printf >&2 'rd(): Substitution failed\n'
return 1
;;
esac
# Try to change into the determined directory
command cd -- "$1"
}
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