Class: RCommand::StandardIOMethod

Inherits:
IOMethod
  • Object
show all
Defined in:
lib/rcommand/io_methods.rb

Instance Method Summary collapse

Constructor Details

#initialize(command_line) ⇒ StandardIOMethod

Returns a new instance of StandardIOMethod.



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# File 'lib/rcommand/io_methods.rb', line 72

def initialize(command_line)
  super(command_line)
  @stty_set = false
  @tab_count = 0
end

Instance Method Details

#eof? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rcommand/io_methods.rb', line 199

def eof?
  begin
    require 'timeout'
    Timeout.timeout(0.01) do
      return $stdin.eof?
    end
  rescue LoadError
    return $stdin.eof?
  rescue Timeout::Error
    return true
  end
end

#readchar ⇒ Object 



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# File 'lib/rcommand/io_methods.rb', line 166

def readchar
  char = nil
  begin
    if @command_line.io_read.object_id == $stdin.object_id
      if RUBY_PLATFORM =~ /mswin/
        require "Win32API"
        char = Win32API.new("crtdll", "_getch", [], "L").Call
      else
        begin
          if @stty_set != true
            system("stty cbreak -echo")
            @stty_set = true
          end
          char = @command_line.io_read.readchar()
        ensure
          if @stty_set != true
            system("stty -cbreak -echo")
            @stty_set = true
          end
        end
      end
    else
      char = @command_line.io_read.readchar()
    end
  rescue Interrupt
    return 3
  rescue Exception
    return nil
  end
  return char
end

#readline ⇒ Object 



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# File 'lib/rcommand/io_methods.rb', line 78

def readline
  if @command_line.prompt != nil && @command_line.io_write != nil
    @command_line.io_write.print(@command_line.prompt)
  end
  
  # RESTORE THIS CODE!
  command = ""
  char = nil
  loop do
    char = self.readchar()
    next if char.nil?
    next if char == 0
    if char != 9
      @tab_count = 0
    end
    if char == 3
      raise Interrupt
    elsif char == 10
      @command_line.io_write.print("\n")
      self << command
      break
    elsif char == 9
      @tab_count += 1
      replacement = nil
      if @tab_count == 1
        unless @command_line.procs[:single_tab].nil?
          replacement = @command_line.procs[:single_tab].call(command)
        end
      elsif @tab_count > 1
        unless @command_line.procs[:double_tab].nil?
          replacement = @command_line.procs[:double_tab].call(command)
        end
      end
      if replacement != nil && replacement.size > command.size
        @command_line.io_write.print(
          8.chr * command.size +
          " " * command.size +
          8.chr * command.size)
        @command_line.io_write.print(replacement)
        command = replacement
      end
    elsif char == 8 || char == 127
      if command.size > 0
        command = command[0..-2]
        @command_line.io_write.print(8.chr + " " + 8.chr)
      end
    else
      command << char.chr
      replacement = nil
      if command.index("\e[A") != nil
        command.gsub!("\e[A", "")
        unless @command_line.procs[:key_up].nil?
          replacement = @command_line.procs[:key_up].call(command)
        end
      elsif command.index("\e[B") != nil
        command.gsub!("\e[B", "")
        unless @command_line.procs[:key_down].nil?
          replacement = @command_line.procs[:key_down].call(command)
        end
      elsif command.index("\e[C") != nil
        command.gsub!("\e[C", "")
        unless @command_line.procs[:key_right].nil?
          replacement = @command_line.procs[:key_right].call(command)
        end
      elsif command.index("\e[D") != nil
        command.gsub!("\e[D", "")
        unless @command_line.procs[:key_left].nil?
          replacement = @command_line.procs[:key_left].call(command)
        end
      else
        if (char == "["[0] && command[-2] != "\e"[0]) ||
            (char != "\e"[0] && char != "["[0])
          @command_line.io_write.print(char.chr)
        end
      end
      if replacement != nil
        @command_line.io_write.print(
          8.chr * command.size +
          " " * command.size +
          8.chr * command.size)
        @command_line.io_write.print(replacement)
        command = replacement
      end
    end
  end
  return command + "\n"
end