converts a given JavaScript file into a bookmarklet using terser

bookmarkletify.sh

#!/usr/bin/env bash

# Overview:
# This script ensures that npm and the terser package are installed,
# and it converts a given JavaScript file into a bookmarklet. The
# output is saved as bmlet_<original_file_name>.js. The script does the following:
# 1. Checks if npm is installed.
# 2. Installs terser globally if not already installed.
# 3. Minifies the provided JavaScript file and converts it into a bookmarklet format.
# 4. Outputs the result into a new file named bmlet_<input_file_name>.js.
#
# Usage:
# ./bookmarkletify.sh <input_file.js>
#
# Example:
# ./bookmarkletify.sh example.js
# This creates bmlet_example.js with the bookmarkletified JavaScript.

# Check if npm and terser are installed
if ! command -v npm &> /dev/null; then
  echo "Error: npm is not installed. Please install Node.js and npm first."
  exit 1
fi

if ! command -v terser &> /dev/null; then
  echo "Installing terser..."
  npm install -g terser
fi

# Check if a file name is provided
if [ -z "$1" ]; then
  echo "Usage: $0 <file.js>"
  exit 1
fi

INPUT_FILE="$1"
BASENAME=$(basename -- "$INPUT_FILE")
OUTPUT_FILE="bmlet_${BASENAME%.js}.js"

# Minify and wrap the JavaScript in a bookmarklet format
terser "$INPUT_FILE" --compress --mangle | sed 's/^/javascript:(function(){/' | sed 's/$/})();/' > "$OUTPUT_FILE"

if [ $? -eq 0 ]; then
  echo "Bookmarkletified version saved as: $OUTPUT_FILE"
  if [[ "$OSTYPE" == "darwin"* ]]; then
    cat "$OUTPUT_FILE" | pbcopy
    echo "And copied to the pasteboard"
  fi
else
  echo "Error occurred while generating the bookmarklet."
fi