#!/usr/bin/env bash
set -euo pipefail

# for i in *placehoder*; do mv "$i" "${i//placeholder/replacement}" done

replacements=
declare -A replacements
unset replacements[0]
replacements[' ']='_';
replacements[':']='_';
replacements["'"]='_';
replacements['(']='_';
replacements[')']='_';
replacements['[']='_';
replacements[']']='_';
while [[ $# > 0 ]]; do
   replacements["$1"]="$2";
   shift 2;
done

for toReplace in "${!replacements[@]}"; do
   echo "$toReplace"
   replacement=${replacements[$toReplace]}
   echo "$replacement"
   for i in *; do
      echo "$i"
      if [[ ! -e "$i" || "$i" == "${i//$toReplace/$replacement}" ]]; then
         continue; # weird behaviour with single space makes this necessary
      fi
      echo "mv $i -> ${i//$toReplace/$replacement}";
      mv "$i" "${i//$toReplace/$replacement}";
   done
done