Add script for webp conversion

#!/bin/bash

# Check if required commands are installed

for cmd in parallel cwebp; do

    if ! command -v "$cmd" &> /dev/null; then

        echo "$cmd is not installed. Please install it with:"

        case "$cmd" in

            parallel)

                echo "  sudo apt install parallel      # Debian/Ubuntu"

                echo "  sudo pacman -S parallel        # Arch"

                echo "  brew install parallel          # macOS"

                ;;

            cwebp)

                echo "  sudo apt install webp          # Debian/Ubuntu"

                echo "  sudo pacman -S libwebp         # Arch"

                echo "  brew install webp              # macOS"

                ;;

        esac

        exit 1

    fi

done

TARGET_DIRS=(

    "./res_phone/drawable-nodpi"

    "./res_tablet/drawable-nodpi"

)

SUPPORTED_EXTENSIONS="png jpg jpeg"

for TARGET_DIR in "${TARGET_DIRS[@]}"; do

    if [ ! -d "$TARGET_DIR" ]; then

        echo "Directory $TARGET_DIR does not exist. Skipping..."

        continue

    fi

    FILES=()

    for ext in $SUPPORTED_EXTENSIONS; do

        while IFS= read -r -d '' file; do

            FILES+=("$file")

        done < <(find "$TARGET_DIR" -maxdepth 1 -type f -iname "*.$ext" -print0)

    done

    if [ ${#FILES[@]} -eq 0 ]; then

        echo "No supported image files found in $TARGET_DIR."

        continue

    fi

    echo "Converting images in $TARGET_DIR to lossless WEBP format..."

    printf "%s\0" "${FILES[@]}" | parallel -0 -eta 'cwebp -q 100 {} -o {.}.webp && rm "{}"'

    if [ $? -eq 0 ]; then

        echo "Conversion completed in $TARGET_DIR. Non-WEBP files deleted."

    else

        echo "An error occurred during conversion in $TARGET_DIR."

    fi

done