resizer.sh

resizer.sh

#!/usr/bin/env bash

MAXWIDTH=2000
MAXHEIGHT=0

usage() {
    echo "Usage: resizer FILENAME"
}

filesize() {
    FILE="$1"
    ls -sh "$FILE" | cut -d" " -f1

}

process() {
    FILE="$1"

    WIDTH=$(identify -format "%w" "$FILE" 2>/dev/null)
    HEIGHT=$(identify -format "%h" "$FILE" 2>/dev/null)
    SIZE=$(filesize "$FILE" 2>/dev/null)

    # Not an image
    if [ -z "$WIDTH" -o -z "$HEIGHT" ]; then
        return 1
    fi

    # Summary
    echo "$FILE"
    echo -n "$WIDTH"x"$HEIGHT" "$SIZE"

    MODIFIED=

    # Max Width
    if [ "$MAXWIDTH" -gt 0 -a "$WIDTH" -gt "$MAXWIDTH" ]; then
        convert "$FILE" -resize "$MAXWIDTH"x "$FILE"
        MODIFIED=true
    fi

    # Max Weight
    if [ "$MAXHEIGHT" -gt 0 -a "$HEIGHT" -gt "$MAXHEIGHT" ]; then
        convert "$FILE" -resize x"$MAXHEIGHT" "$FILE"
        MODIFIED=true
    fi

    # Changes summary
    if [ "$MODIFIED" = true ]; then
        WIDTH=$(identify -format "%w" "$FILE")
        HEIGHT=$(identify -format "%h" "$FILE")
        SIZE=$(filesize "$FILE")

        echo -n -e "\t" "->   "
        echo -n "$WIDTH"x"$HEIGHT" "$SIZE"
    fi

    echo
    return 0
}

if [ "$#" == "0" ]; then
    usage
    exit 1
fi

if [ -z "$1" ]; then
    usage
    exit 1
fi

while (($#)); do
    if [ -f "$1" ]; then
        process "$1"
    elif [ -d "$1" ]; then
        find "$1" -type f | while read file; do
            process "$file"
        done
    else
        echo "ERROR: $1 is no file or directory."
        exit 1
    fi
    shift
done