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#!/bin/bash
PROGNAME=${0##*/}
INPUT=''
QUIET='0'
NOSTATS='0'
max_input_size=0
max_output_size=0
usage()
{
cat <<EO
Usage: $PROGNAME [options]
Script to optimize JPG and PNG images in a directory.
Options:
EO
cat <<EO | column -s\& -t
-h, --help & shows this help
-q, --quiet & disables output
-i, --input [dir] & specify input directory (current directory by default)
-o, --output [dir] & specify output directory ("output" by default)
-ns, --no-stats & no stats at the end
EO
}
# $1: input image
# $2: output image
optimize_image()
{
input_file_size=$(stat -c%s "$1")
max_input_size=$(expr $max_input_size + $input_file_size)
if [ "${1##*.}" = "png" ]; then
optipng -o1 -clobber -quiet $1 -out $2
pngcrush -q -rem alla -reduce $1 $2 >/dev/null
fi
if [ "${1##*.}" = "jpg" -o "${1##*.}" = "jpeg" ]; then
jpegtran -copy none -progressive $1 > $2
fi
output_file_size=$(stat -c%s "$2")
max_output_size=$(expr $max_output_size + $output_file_size)
}
get_max_file_length()
{
local maxlength=0
IMAGES=$(find $INPUT -regextype posix-extended -regex '.*\.(jpg|jpeg|png)' | grep -v $OUTPUT)
for CURRENT_IMAGE in $IMAGES; do
filename=$(basename "$CURRENT_IMAGE")
if [[ ${#filename} -gt $maxlength ]]; then
maxlength=${#filename}
fi
done
echo "$maxlength"
}
main()
{
# If $INPUT is empty, then we use current directory
if [[ "$INPUT" == "" ]]; then
INPUT=$(pwd)
fi
# If $OUTPUT is empty, then we use the directory "output" in the current directory
if [[ "$OUTPUT" == "" ]]; then
OUTPUT=$(pwd)/output
fi
# We create the output directory
mkdir -p $OUTPUT
# To avoid some troubles with filename with spaces, we store the current IFS (Internal File Separator)...
SAVEIFS=$IFS
# ...and we set a new one
IFS=$(echo -en "\n\b")
max_filelength=`get_max_file_length`
pad=$(printf '%0.1s' "."{1..600})
sDone=' [ DONE ]'
linelength=$(expr $max_filelength + ${#sDone} + 5)
# Search of all jpg/jpeg/png in $INPUT
# We remove images from $OUTPUT if $OUTPUT is a subdirectory of $INPUT
IMAGES=$(find $INPUT -regextype posix-extended -regex '.*\.(jpg|jpeg|png)' | grep -v $OUTPUT)
if [ "$QUIET" == "0" ]; then
echo --- Optimizing $INPUT ---
echo
fi
for CURRENT_IMAGE in $IMAGES; do
filename=$(basename $CURRENT_IMAGE)
if [ "$QUIET" == "0" ]; then
printf '%s ' "$filename"
printf '%*.*s' 0 $((linelength - ${#filename} - ${#sDone} )) "$pad"
fi
optimize_image $CURRENT_IMAGE $OUTPUT/$filename
if [ "$QUIET" == "0" ]; then
printf '%s\n' "$sDone"
fi
done
# we restore the saved IFS
IFS=$SAVEIFS
if [ "$NOSTATS" == "0" -a "$QUIET" == "0" ]; then
echo
echo "Input: " $(human_readable_filesize $max_input_size)
echo "Output: " $(human_readable_filesize $max_output_size)
space_saved=$(expr $max_input_size - $max_output_size)
echo "Space save: " $(human_readable_filesize $space_saved)
fi
}
human_readable_filesize()
{
echo -n $1 | awk 'function human(x) {
s=" b Kb Mb Gb Tb"
while (x>=1024 && length(s)>1)
{x/=1024; s=substr(s,4)}
s=substr(s,1,4)
xf=(s==" b ")?"%5d ":"%.2f"
return sprintf( xf"%s", x, s)
}
{gsub(/^[0-9]+/, human($1)); print}'
}
SHORTOPTS="h,i:,o:,q,s"
LONGOPTS="help,input:,output:,quiet,no-stats"
ARGS=$(getopt -s bash --options $SHORTOPTS --longoptions $LONGOPTS --name $PROGNAME -- "$@")
eval set -- "$ARGS"
while true; do
case $1 in
-h|--help)
usage
exit 0
;;
-i|--input)
shift
INPUT=$1
;;
-o|--output)
shift
OUTPUT=$1
;;
-q|--quiet)
QUIET='1'
;;
-s|--no-stats)
NOSTATS='1'
;;
--)
shift
break
;;
*)
shift
break
;;
esac
shift
done
main

If you set INPUT and OUTPUT at the top of the file (like below), you can remove the beginning of your main function. Also no need to evaluate pwd when you can use ..

INPUT=.
OUTPUT=./output

You could have a echo_verbose function or something that would save you from checking the state of QUIET everytime:

echo_verbose ()
{
  if [ $QUIET == '0' ]; then
    echo $1
  fi
}

Anasxrt commented Oct 14, 2016 edited

I have found the error ** Error: Unrecognized option: -clobber on PNG file
I am using optipng pngcrush

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