Module: ShellShock::Context

Includes:
Logger
Defined in:
lib/shell_shock/context.rb

Instance Method Summary collapse

Methods included from Logger

#log

Instance Method Details

#abort! ⇒ Object 



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# File 'lib/shell_shock/context.rb', line 45

def abort!
  @abort = true
end

#abort? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/shell_shock/context.rb', line 49

def abort?
  @abort
end

#add_command(command, *aliases) ⇒ Object 



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# File 'lib/shell_shock/context.rb', line 53

def add_command command, *aliases
  @commands ||= {}
  aliases.each {|a| @commands[a] = command}
end

#head_tail(string) ⇒ Object 



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# File 'lib/shell_shock/context.rb', line 11

def head_tail string
  if string
    m = /[^ ]+/.match(string.strip)
    return m[0], m.post_match.strip if m
  end
  return '', ''
end

#push ⇒ Object 



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# File 'lib/shell_shock/context.rb', line 58

def push
  @prompt ||= ' > '
  add_command HelpCommand.new(@commands), '?', 'help'
  add_command ExitCommand.new(self), 'exit', 'quit'
  begin
    until abort?
      refresh
      line = Readline.readline(@prompt, true)
      if line
        first, rest = head_tail(line)
        log { "looking for command \"#{first}\" with parameter \"#{rest}\"" }
        if @commands[first]
          @commands[first].execute rest
        else
          puts "unknown command \"#{first}\""
        end
      else
        abort!
      end
      puts
    end
  rescue Interrupt => e
    puts
  end
end

#refresh ⇒ Object 



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# File 'lib/shell_shock/context.rb', line 19

def refresh
  refresh_commands if respond_to?(:refresh_commands)
  Readline.completer_word_break_characters = ''
  Readline.completion_proc = lambda do |string|
    log { "trying completion for \"#{string}\"" }
    first, rest = head_tail(string)
    log { "split \"#{first}\" from \"#{rest}\"" }
    if first
      command = @commands[first]
      if command
        log { "matched #{first} command" }
        if command.respond_to?(:completion)
          completions = command.completion(rest).map {|c| "#{first} #{c}" }
        else
          log { "#{first} has no completion proc" }
          completions = []
        end
      end
    end

    completions ||= @commands.keys.grep( /^#{Regexp.escape(first)}/ ).sort
    log { "returning #{completions.inspect} completions" }
    completions
  end
end