a shell script to resize activity images for exploor

exploor-resizer.sh

#!/bin/bash

if [ "$#" -lt 1 ]; then
    TARGET_DIR="."
else
    TARGET_DIR="$1"
fi

if [ "$#" -lt 2 ]; then
    ROOT_DIR="$HOME/exploor/images"
else
    ROOT_DIR="$2"
fi

mkdir -p "$ROOT_DIR" 2> /dev/null
LOG_FILE="$ROOT_DIR/log_$(date +%s).txt"

function LOG {
    echo "$1" >> "$LOG_FILE"
    echo "$1"
}

# resize functons
function RESIZE_PORTRAIT_IMG {
   # parse input params
   dw=$3
   dh=$4
   retry=$5

   original=$1
   # define result name
   result="${2}/${dw}_${dh}_$(basename "$original")"

   # copy img
   cp "$original" "$result"

   # resample
   (sips --resampleWidth "$dw" "$result" &>/dev/null) || \
       (LOG "ERROR: couldn't resample portrait img $original")

   # set offset for cropping
   H=$(sips -g pixelHeight "$result" | grep pixelHeight | grep -Eo "\d+")

   if [ "$H" -lt "$dh" ]; then
       if [ "$retry" == "true" ]; then
           RESIZE_LANDSCAPE_IMG "$1" "$2" "$3" "$4" "false"
       else
           LOG "ERROR: couldn't resize img $original to $result (too many atempts)"
       fi
   else
       # crop
       dx=0
       dy=$(((H-dh)/2))
       DIM="${dw}x${dh}+$dx+$dy"
       LOG "cropping to $DIM"
       (convert "$result" -crop "$DIM" "$result" &>/dev/null) || \
            (LOG "ERROR: couldn't crop portrait img $original")
   fi
}

function RESIZE_LANDSCAPE_IMG {
   # parse input params
   dw=$3
   dh=$4
   retry=$5

   original=$1
   # define result name
   result="${2}/${dw}_${dh}_$(basename "$original")"

   # copy img
   cp "$original" "$result"

   # resample
   (sips --resampleHeight "$dh" "$result" &>/dev/null) || \
       (LOG "ERROR: couldn't resample landscape img $original")

   # set offset for cropping
   W=$(sips -g pixelWidth "$result" | grep pixelWidth | grep -Eo "\d+")

   # crop
   if [ "$W" -lt "$dw" ]; then
       if [ "$retry" == "true" ]; then
           RESIZE_PORTRAIT_IMG "$1" "$2" "$3" "$4" "false"
       else
           LOG "ERROR: couldn't resize img $original to $result (too many atempts)"
       fi
   else
       dy=0
       dx=$(((W-dw)/2))
       DIM="${dw}x${dh}+$dx+$dy"
       LOG "cropping to $DIM"
       (convert "$result" -crop "$DIM" "$result" &>/dev/null) || \
           (LOG "ERROR: couldn't crop landscape img $original")
   fi
}

INDEX=1

find "$TARGET_DIR" -type f \
    -iname "*.JPG" \
    -o -iname "*.JPEG" \
    -o -iname "*.GIF" \
    -o -iname "*.PNG" \
    -o -iname "*.TIFF" | \
while read IMG ; do
    W=$(sips -g pixelWidth "$IMG" | grep pixelWidth | grep -Eo "\d+")
    H=$(sips -g pixelHeight "$IMG" | grep pixelHeight | grep -Eo "\d+")

    OUTPUT_DIR="${ROOT_DIR}/$(dirname "$IMG")"
    # ensure output dir exists
    mkdir -p "$OUTPUT_DIR" 2> /dev/null

    LOG "IMG#${INDEX}: $IMG (${W}x${H})"

    if [ "$W" -lt "$H" ]; then
        RESIZE_PORTRAIT_IMG "$IMG" "$OUTPUT_DIR" 1000 556 "true"
        RESIZE_PORTRAIT_IMG "$IMG" "$OUTPUT_DIR" 600 400 "true"
    else
        RESIZE_LANDSCAPE_IMG "$IMG" "$OUTPUT_DIR" 1000 556 "true"
        RESIZE_LANDSCAPE_IMG "$IMG" "$OUTPUT_DIR" 600 400 "true"
    fi

    INDEX=$((INDEX+1))
done