pdf.sh - ghostscript shell commands to easy PDF compression

pdf.sh

pdf-compress() {
    # Ensure ghostscript is installed
    if ! command -v gs &> /dev/null; then
        echo "Ghostscript is not installed. Please install it first."
        return 1
    fi

    # Check if the input file is provided
    if [ -z "$1" ]; then
        echo "Usage: pdf-compress <input.pdf>"
        return 1
    fi

    input_file="$1"

    # Check if the input file exists
    if [ ! -f "$input_file" ]; then
        echo "File '$input_file' does not exist."
        return 1
    fi

    output_file="compressed_$input_file"

    # Print size before
    before_size=$(stat -c%s "$input_file" 2>/dev/null || stat -f%z "$input_file")
    echo "Original size: $before_size bytes"

    echo "Compressing '$input_file' to '$output_file'..."

    gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook \
         -dNOPAUSE -dQUIET -dBATCH -sOutputFile="$output_file" "$input_file"

    # Print size after
    after_size=$(stat -c%s "$output_file" 2>/dev/null || stat -f%z "$output_file")
    echo "Compressed size: $after_size bytes"

    # Move original to trash (Linux: gio, macOS: osascript)
    if [[ "$(uname)" == "Darwin" ]]; then
        # macOS: use AppleScript to move to trash
        osascript -e 'tell application "Finder" to delete POSIX file "'"$input_file"'"'
    else
        # Linux: use gio
        if command -v gio &> /dev/null; then
            gio trash "$input_file"
        else
            echo "Warning: gio not found, cannot move to trash. Deleting file instead."
            rm "$input_file"
        fi
    fi

    # Rename compressed to original name
    mv "$output_file" "$input_file"

    echo "Compression complete: $input_file (was $before_size bytes, now $after_size bytes)"
}

pdf-compress-all() {
  # Ensure ghostscript is installed
  if ! command -v gs &> /dev/null; then
    echo "Ghostscript is not installed. Please install it first."
    return 1
  fi

  # Check if there are any PDF files in the current directory
  if ls *.pdf 1> /dev/null 2>&1; then
    echo "Compressing all PDF files in the current directory..."
    for f in *.pdf; do
        pdf-compress "$f"
    done
  else
    echo "No PDF files found in the current directory."
  fi
}