Simple bulk rename Bash function that opens absolute paths in the local directory in vim. It lets you confirm the edit on save.

bulkrename.bash

function bulkrename(){
	local tmpfile=$(mktemp)
	ls -d "$PWD"/* > "$tmpfile"
	nvim "$tmpfile"
	local resultfile=$(mktemp)
	while IFS= read -r line1 && IFS= read -r line2 <&3; do
		printf "mv \"%s\" \"%s\"\n" "$line1" "$line2" >> "$resultfile"
	done < <(ls) 3<$tmpfile
	cat "$resultfile"
	read -p "Do you want to execute the commands above? [y/N] " toExecute
	if [[ "$toExecute" =~ y.* ]]; then
		sh "$resultfile"
	else
		echo "Action cancelled"
	fi
}

2: Creates a temporary file
3: Pipes ls with the "absolute path" PWD trick to that temporary file
4: Opens the file in nvim, but you can swap the editor to whatever

5: Creates a temporary file resultfile that will be the confirmation .sh script. Also has the benefit of seeing exactly what happened after the fact, in case you want to rename the files back.
6: while loop, reads two input streams at the same time
7: simple print of "mv line1 line2" that joins the streams together
8: pipes ls into /dev/stdin, pipes $tmpfile into input stream 3
9: lets you see what is about to be executed
10-15: yes/no prompt. If yes runs the file as a shell script.