A Ruby script that accepts multiple files as command line arguments. It outputs an array of JSON objects, one for each input file. The result can be embedded in an all-in-one .html file.

base64_json.rb

#!/usr/bin/env ruby
require 'json'
require 'base64'
require 'pathname'
# require 'mime/types'

# Perplexity.ai prompt:
# Write a Ruby script that accepts multiple files as command line arguments. It
# should output an array of JSON objects, one for each input file, with these
# attributes:
# - 'name': the name of the file.
# - 'mime': the MIME type of the file.
# - 'data': the file contents, encoded in base64.

# If no files provided, show usage and exit
if ARGV.empty?
  STDERR.puts "Usage: ruby script.rb file1 [file2 ... fileN]"
  exit 1
end

def mime_type_for(path)
  # Use MIME::Types if available, fall back to file command-like heuristic
  if defined?(Mime::Types)
    mime = MIME::Types.type_for(path).first
    return mime.to_s if mime
  end

  # Fallback: simple extension-based (not perfect, but better than nothing)
  ext = File.extname(path).downcase
  case ext
  when ".txt"  then "text/plain"
  when ".json" then "application/json"
  when ".csv"  then "text/csv"
  when ".jpg", ".jpeg" then "image/jpeg"
  when ".png"  then "image/png"
  when ".gif"  then "image/gif"
  when ".svg"  then "image/svg+xml"
  when ".pdf"  then "application/pdf"
  when ".webp" then "image/webp"
  when ".wav"  then "audio/wav"
  when ".mp3"  then "audio/mpeg"
  else "application/octet-stream"
  end
end

results = ARGV.map do |file_path|
  begin
    unless File.exist?(file_path)
      raise Errno::ENOENT
    end

    data = File.binread(file_path)
    encoded = Base64.strict_encode64(data)
    {
      'name' => File.basename(file_path),
      'mime' => mime_type_for(file_path),
      'data' => encoded
    }
  rescue => e
    {
      'name' => File.basename(file_path),
      'mime' => 'application/octet-stream',
      'data' => Base64.strict_encode64("Error: #{e.message}")
    }
  end
end

puts JSON.pretty_generate(results)