image-optim-0.2.1.sh

#!/bin/bash
#Author: Matteo Canu <soraph88@gmail.com>

# Handy script to resize and optimize image size.

# Version 0.2.1
# 2020-02-07: Linting and cleanup

wkpath=

while getopts "p:l:w:h:b:" OPTION
do
  case $OPTION in
	p)
		wkpath=$OPTARG
		;;
	l)
		logfile=$OPTARG
		;;
	w)
		maxwidth=$OPTARG
		;;
	h)
		maxheight=$OPTARG
		;;
	*)
		logit "Invalid option specified"
		;;
     esac
done

#Check for a valid working path
if [ -z "${wkpath}" ]; then
	echo "Usage: $0 -p <working directory>"
	echo "Available commands:"
	echo "	-l	Specify a log file to dump the result of the operations"
	echo "	-w	Max Width for the images - wider images will be resized maintaing its aspect ratio"
	echo "	-h	Max Height for the images - heigher images will be resized maintaing its aspect ratio"
	echo ""
	echo "If a log file is specified there will be no output on the screen."
	exit
fi

function human_filesize() {
	awk -v sum="$1" ' BEGIN {hum[1024^3]="Gb"; hum[1024^2]="Mb"; hum[1024]="Kb"; for (x=1024^3; x>=1024; x/=1024) { if (sum>=x) { printf "%.2f %s\n",sum/x,hum[x]; break; } } if (sum<1024) print "1kb"; } '
}

#Definition of the log manager
function logit () {

	if [ -z "${logfile}" ]; then
		#If no output file is specified we output on the screen
		echo "[$(date +%H:%M:%S)] $*"
	else
		#If a log file is specified we either create it or append to it the informations
		echo "[$(date +%c)] $*" >> "${logfile}"
	fi
}

function slogit () {
	while read -r data; do
		logit "${data}"
	done
}

if [  -z "${maxwidth}" ] && [ -z "${maxheight}" ]; then
	logit "No resize requested. Jumping to the optimization tasks."
else
	if command -v convert > /dev/null; then
		logit "Beginning Resize filesize optimization."
		spazio_iniziale=$(du -s "${wkpath}" | awk -F "\t" {'print $1'})
		find "${wkpath}" -type f -iname "*.jpg" -or -iname "*.jpeg" -or -iname "*.png" | while read -r immagine; do
      colorspace=$(identify -format %[colorspace] "${immagine}")
			if [ "$maxwidth" ];then #if I set a width
        if [ ${#colorspace} -gt 0 ]; then
          convert "${immagine}" -colorspace RGB -resize "$maxwidth"\> -colorspace "${colorspace}" "${immagine}"
        else
          convert "${immagine}" -resize "$maxwidth"\> "${immagine}"
        fi
			fi
			if [ "$maxheight" ];then #if I set an height
        if [ ${#colorspace} -gt 0 ]; then
          convert "${immagine}" -colorspace RGB -resize x"$maxheight"\> -colorspace "${colorspace}" "${immagine}"
        else
          convert "${immagine}" -resize x"$maxwidth"\> "${immagine}"
        fi
			fi
		done
		spazio_finale=$(du -s "${wkpath}" | awk -F "\t" {'print $1'})
		spazio_guadagnato=$(( (spazio_iniziale - spazio_finale) * 1024 ))
		logit "Space freed: $( human_filesize ${spazio_guadagnato} )"
		logit "Resize task terminated."
	else
		logit "Missing packet convert, skipping resize tasks."
	fi
fi

if command -v optipng > /dev/null; then
	logit "Beginning PNG filesize optimization."
	spazio_iniziale=$(du -s "${wkpath}" | awk -F "\t" {'print $1'})
	find "${wkpath}" -type f -iname "*.png" | while read -r immagine; do
		if ! (optipng -o1 -simulate "${immagine}" | grep -q "already optimized" ); then
			optipng -o4 -quiet "${immagine}"
		fi
	done
	spazio_finale=$(du -s "${wkpath}" | awk -F "\t" {'print $1'})
	spazio_guadagnato=$(( (spazio_iniziale - spazio_finale) * 1024 ))
	logit "Space freed: $( human_filesize ${spazio_guadagnato} )"
	logit "PNG filesize optimization terminated."
else
	logit "Missing packet optipng, skipping PNG filesize optimization."
fi

if command -v jpegtran > /dev/null; then
	logit "Beginning JPEG filesize optimization."
	spazio_iniziale=$(du -s "${wkpath}" | awk -F "\t" {'print $1'})
	find "${wkpath}" -type f -iname "*.jpg" -or -iname "*.jpeg" | while read -r immagine; do
		jpegtran -copy none -progressive -outfile "${immagine}" "${immagine}"
	done
	spazio_finale=$(du -s "${wkpath}" | awk -F "\t" {'print $1'})
	spazio_guadagnato=$(( (spazio_iniziale - spazio_finale) * 1024 ))
	logit "Space freed: $( human_filesize ${spazio_guadagnato} )"
	logit "JPG filesize optimization terminated."
else
	logit "Missing packet jpegtran, skipping JPEG filesize optimization."
fi
exit