BASH script to convert image urls in .CSS files to .ERB style asset paths. Example usage: ./erbify-css.sh src libfoo input-file.css converts: .showgrid { background: url(src/grid.png); } to: .showgrid { background: url(<%=asset_path("libfoo/grid.png")%>); }

erbify-css.sh

#!/bin/bash

if [ $# -ne 3 ]; then
  echo "Usage: $0 <substitute-path> <with-path> <css-file>"
  exit 1
fi

from=$1
to=$2
file=$3
out=$file.erb

sed 's{url\s*(\s*'$from'\([^)]\+\){url(<%=asset_path("'$to'\1")%>{g' $file > $out
echo $out written