minify.sh

#!/bin/bash

#ls time format depends on OS
if [ "FreeBSD" = `uname` ] || [ "Darwin"  = `uname` ]; then
    LS='ls -l -D %Y%m%d%H%M%S'
else
    LS='ls -l --time-style +%Y%m%d%H%M%S'
fi

types=(js css)
#For storing the URL of API to minify the files
declare -A urls
urls[js]="http://javascript-minifier.com/raw"
urls[css]="http://cssminifier.com/raw"

echo "Scaning direcotry..."

#list all the directories except git directory
for dir in `find . -type d | grep -v \/\.git\/`
do
    for filetype in "${types[@]}"
    do
        echo "Finding $filetype to be compressed under $dir ..."
        #list js/css files exclude already minified files
        for filename in `ls $dir/*.$filetype 2> /dev/null | sed "s/\.$filetype//g" | grep -v .min$`
        do
            do_min=0
            #echek if exist a minified version
            if [ -f $filename\.min\.$filetype ]; then
                #already exist a minified version, compare the modify time to decide compressing or not
                orig_ver_time=`eval $LS $filename\.$filetype | awk '{print $6}'`
                mini_ver_time=`eval $LS $filename\.min\.$filetype | awk '{print $6}'`
            if [ $mini_ver_time -lt $orig_ver_time ]; then
                do_min=1
            fi
            else
                do_min=1
            fi
            if [ 0 -lt $do_min ]; then
                echo "Compressing $filename.$filetype ..."
                curl -X POST -s --data-urlencode "input@$filename.$filetype" ${urls[$filetype]} > $filename\.min.$filetype
                #check whether compressed file is bigger than original or not
                orig_ver_size=`eval $LS $filename\.$filetype | awk '{print $5}'`
                mini_ver_size=`eval $LS $filename\.min\.$filetype | awk '{print $5}'`
                if [ $mini_ver_size -gt $orig_ver_size ]; then
                    echo ": The file $filename.min.$filetype is bigger than the original file."
                fi
                #if there are some error in original file, compressed file would contain error message.
                if [ $mini_ver_size -lt 100 ]; then
                    match_message=`sed -n '1p' $filename\.min\.$filetype | grep -E "Error:|There is an error" >>/dev/null ; echo $?`
                    if [ $match_message -eq 0 ]; then
                        echo ": Could not compress properly, please check the original file."
                    fi
                fi
            fi
        done
    done
done

echo "All done!"