Easy simple npm linker

npml.sh

#!/bin/bash
if [ $# = 0 ]; then echo 'Arguments: <package>...'; exit 1; fi
DIR="$PWD"
for PKG in "$@"; do
	BASE="$(basename "$PKG")"
	while :; do
		if [ -e node_modules/"$PKG" ]; then
			DEST="$PWD"/node_modules/"$PKG"
			while :; do
				if [ -d "$BASE" ]; then
					TARGET="$(realpath -L --relative-to "$DEST"/.. "$BASE")"
					echo "$DEST -> $TARGET"
					rm -rf "$DEST"
					ln -s "$TARGET" "$DEST"
					break
				fi
				if [ "$PWD" = / ]; then >&2 echo Could not find source of $PKG; break; fi
				cd ..
			done
			break
		fi
		if [ "$PWD" = / ]; then >&2 echo Could not find usage of $PKG; break; fi
		cd ..
	done
	cd "$DIR"
done

When run with foo, this searches up until it finds node_modules/foo and then searches further up until it finds foo and creates a symbolic link.

When run with @foo/bar, this searches up until it finds node_modules/@foo/bar and then searches further up until it finds bar and creates a symbolic link.

This uses GNU Bash isms, and will almost certainly need adjustment for macOS or other Bashes.