Bash script to "pretty-print" minified CSS.

prettyCss.sh

#!/bin/bash
#Author:                Stephan Schmitz, https://github.com/eyecatchup,      <eyecatchup@gmail.com>
#Based on work by:      Michael Bianco,  http://developer.mabwebdesign.com/, <software@mabwebdesign.com>
#Description:           Bash script to create a pretty-printed version of a minified CSS file.
#                       Note: Requires GNU sed. See: http://www.gnu.org/software/sed//sed.html
#Usage:                 prettyCss.sh inputfile [outputfile]
#                       If [outputfile] is not given, pretty-printed CSS will be send to stdout.

SED_COMMAND=/bin/sed    # NOTE: Change the SED_COMMAND variable value to the path to your GNU sed!


# Helper function
doIt () {
    echo "Saving formatted version of CSS file '$1' to '$2'."
    exec 1>"$2"
}

# Check correct number of arguments
if [ $# -ne 1 ] && [ $# -ne 2 ]; then
    echo "This script must be run with at least one argument, providing"
    echo "the path to the minified css file to be pretty-printed."
    echo "An optional second argument may be given, specifying the path"
    echo "to the file to save the pretty-printed CSS to."
    exit 1
fi
# Check if argument points to a regular file.
if [ ! -f "$1" ]; then
    echo "No regular file '$2' found! Typo?"
    exit 1
fi
# Check if the input file is readable.
if [ ! -r "$1" ]; then
    echo "'$2' is not readable?!"
    exit 1
fi

# If output file already exists, ask for confirmation before overwriting it.
if [ -w "$2" ]; then
    read -p "Overwrite existing '$2'? Type [y]es or [n]o ..." -n 1 -r
    echo
    if [[ $REPLY == "y" ]]; then
        doIt $1 $2
    else
        echo "Aborted. Please run the script again, using another output file name."
        exit 2
    fi
elif [ ! -z "$2" ]; then
    doIt $1 $2
fi

# Some regex sugar
cat "$1" |
"$SED_COMMAND" 's/\([;{]\)\([^\n]\)/\1\n\t\2/g' |   #do main formatting for all CSS properties and the beginning of CSS declerations
"$SED_COMMAND" 's/\([^}]\)}/\1;\n}\n\n/g' |         #end of decleration formatting
"$SED_COMMAND" 's/{/ {/g' |                         #more beggining of CSS decleration
"$SED_COMMAND" 's/[,]/& /g' |                       #add some spaces for readability
"$SED_COMMAND" '
/}/ {
    N
    N
    s/}\n\([^\n]\)/}\n\n\1/
}'                                                  #make sure there are two \n's after the closing brace
exit 0

This is wonderful! thank you!