Some improvements?

[636f7374]

Summary

• More beautiful and easier to understand. :)

Re-design

• secrets/src/secrets.cr

module Secrets
  enum Action
    Delete
    REnter
    NEnter
    Left
    Right
    Up
    Down
    Exit
    Typing
  end

  def self.gets(prompt : String = String.new, hint : String = "*", empty_warning : String? = nil, retry : Int32? = nil) : String
    print prompt
    input = [] of String
    counter = 0_i32

    loop do
      typing = stdin_gets
      action = to_action typing

      case action
      when .delete?
        next if input.empty?

        input.pop

        # Masked
        print String.build { |io| io << '\u{8}' << ' ' << '\u{8}' }
      when .exit?
        abort "\n"
      when .n_enter?
        break unless input.empty?
        break if retry <= counter if retry

        puts empty_warning if empty_warning
        counter += 1_i32
      when .r_enter?
        break unless input.empty?
        break if retry <= counter if retry

        puts empty_warning if empty_warning
        counter += 1_i32
      else
        input << typing
        print hint * typing.size
      end
    end

    puts
    input.join
  end

  def self.to_action(input : String)
    return Action::Exit if input.empty?

    case input
    when "\u007F"
      Action::Delete
    when "\e[D"
      Action::Left
    when "\e[C"
      Action::Right
    when "\e[A"
      Action::Up
    when "\e[B"
      Action::Down
    when "\r", "\r\r", "\r\r\r"
      Action::REnter
    when "\n", "\n\n", "\n\n\n"
      Action::NEnter
    when "\u0003"
      Action::Exit
    else
      Action::Typing
    end
  end

  def self.stdin_gets : String
    buffer = uninitialized UInt8[3_i32]

    STDIN.raw do |io|
      length = io.read buffer.to_slice
      String.new buffer.to_slice[0_i32, length]
    end
  end
end

Usage

secret = Secrets.gets empty_warning: "Warning", retry: 5_i32
puts [secret]

[636f7374]

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