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# If given two arguments, replace the first instance of the first argument with
# the second argument in $PWD, and make that the target of cd(). This POSIX
# version cannot handle options, but it can handle an option terminator (--),
# so e.g. `cd -- -foo -bar` should work.
cd() {
# First check to see if we can perform the substitution at all
if (
# If we have any options, we can't do it, because POSIX shell doesn't
# let us (cleanly) save the list of options for use later in the script
for arg ; do
case $arg in
--) break ;;
-*) return 1 ;;
esac
done
# Shift off -- if it's the first argument
[ "$1" = -- ] && shift
# Check we have two non-null arguments
[ "$#" -eq 2 ] || return
[ -n "$1" ] || return
[ -n "$2" ] || return
) ; then
# Set the positional parameters to an option terminator and what will
# hopefully end up being the substituted directory name
set -- -- "$(
# If the first of the existing positional arguments is --, shift it
# off
[ "$1" = -- ] && shift
# Current path: e.g. /foo/ayy/bar/ayy
cur=$PWD
# Pattern to replace: e.g. ayy
pat=$1
# Text with which to replace pattern: e.g. lmao
rep=$2
# /foo/
curtc=${cur%%"$pat"*}
# /bar/ayy
curlc=${cur#*"$pat"}
# /foo/lmao/bar/ayy
new=${curtc}${rep}${curlc}
# Check pattern was actually in $PWD; this indirectly checks that
# $PWD and $pat are both actually set, too; it's valid for $rep to
# be empty, though
[ "$cur" != "$curtc" ] || exit
# Check we ended up with something to change into
[ -n "$new" ] || exit
# Print the replaced result
printf '%s\n' "$new"
)"
# Check we have a second argument
if [ -z "$2" ] ; then
printf >&2 'cd(): Substitution failed\n'
return 1
fi
fi
# Execute the cd command as normal
command cd "$@"
}
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