Mini Shell

# frozen_string_literal: true

require "pathname"
require "optparse"

module SyntaxSuggest
  # All the logic of the exe/syntax_suggest CLI in one handy spot
  #
  #   Cli.new(argv: ["--help"]).call
  #   Cli.new(argv: ["<path/to/file>.rb"]).call
  #   Cli.new(argv: ["<path/to/file>.rb", "--record=tmp"]).call
  #   Cli.new(argv: ["<path/to/file>.rb", "--terminal"]).call
  #
  class Cli
    attr_accessor :options

    # ARGV is Everything passed to the executable, does not include executable name
    #
    # All other intputs are dependency injection for testing
    def initialize(argv:, exit_obj: Kernel, io: $stdout, env: ENV)
      @options = {}
      @parser = nil
      options[:record_dir] = env["SYNTAX_SUGGEST_RECORD_DIR"]
      options[:record_dir] = "tmp" if env["DEBUG"]
      options[:terminal] = SyntaxSuggest::DEFAULT_VALUE

      @io = io
      @argv = argv
      @exit_obj = exit_obj
    end

    def call
      if @argv.empty?
        # Display help if raw command
        parser.parse! %w[--help]
        return
      else
        # Mutates @argv
        parse
        return if options[:exit]
      end

      file_name = @argv.first
      if file_name.nil?
        @io.puts "No file given"
        @exit_obj.exit(1)
        return
      end

      file = Pathname(file_name)
      if !file.exist?
        @io.puts "file not found: #{file.expand_path} "
        @exit_obj.exit(1)
        return
      end

      @io.puts "Record dir: #{options[:record_dir]}" if options[:record_dir]

      display = SyntaxSuggest.call(
        io: @io,
        source: file.read,
        filename: file.expand_path,
        terminal: options.fetch(:terminal, SyntaxSuggest::DEFAULT_VALUE),
        record_dir: options[:record_dir]
      )

      if display.document_ok?
        @io.puts "Syntax OK"
        @exit_obj.exit(0)
      else
        @exit_obj.exit(1)
      end
    end

    def parse
      parser.parse!(@argv)

      self
    end

    def parser
      @parser ||= OptionParser.new do |opts|
        opts.banner = <<~EOM
          Usage: syntax_suggest <file> [options]

          Parses a ruby source file and searches for syntax error(s) such as
          unexpected `end', expecting end-of-input.

          Example:

            $ syntax_suggest dog.rb

            # ...

              > 10  defdog
              > 15  end

          ENV options:

            SYNTAX_SUGGEST_RECORD_DIR=<dir>

            Records the steps used to search for a syntax error
            to the given directory

          Options:
        EOM

        opts.version = SyntaxSuggest::VERSION

        opts.on("--help", "Help - displays this message") do |v|
          @io.puts opts
          options[:exit] = true
          @exit_obj.exit
        end

        opts.on("--record <dir>", "Records the steps used to search for a syntax error to the given directory") do |v|
          options[:record_dir] = v
        end

        opts.on("--terminal", "Enable terminal highlighting") do |v|
          options[:terminal] = true
        end

        opts.on("--no-terminal", "Disable terminal highlighting") do |v|
          options[:terminal] = false
        end
      end
    end
  end
end