Module: Prompt::Console

Defined in:
lib/prompt/console/builtins.rb,
lib/prompt/console/console_module.rb

Defined Under Namespace

Classes: Builtins

Constant Summary collapse

HISTORY_MAX_SIZE = 
100
CompletionProc = 
proc do |word_starting_with|
  line_starting_with = Readline.line_buffer[0...Readline.point]
  Prompt.application.completions(line_starting_with, word_starting_with)
end

Class Method Summary collapse

Class Method Details

.command_exception(e) ⇒ Object 



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# File 'lib/prompt/console/console_module.rb', line 77

def self.command_exception e
  puts e.message
  puts e.backtrace.map {|s| "  #{s}" }.join("\n")
end

.command_not_found(line) ⇒ Object 



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# File 'lib/prompt/console/console_module.rb', line 64

def self.command_not_found line
  words = self.split line
  suggestions = Prompt.application.commands.select { |cmd| cmd.could_match? words }
  if suggestions.empty?
    puts "Command not found"
  else
    puts "Command not found. Did you mean one of these?"
    suggestions.each do |cmd|
      puts "  #{cmd.usage}"
    end
  end
end

.load_history(file) ⇒ Object 



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# File 'lib/prompt/console/console_module.rb', line 56

def self.load_history file
  if File.exist? file
    File.readlines(file).each do |line|
      Readline::HISTORY.push line.strip
    end
  end
end

.save_history(file) ⇒ Object 



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# File 'lib/prompt/console/console_module.rb', line 47

def self.save_history file
  history_no_dups = Readline::HISTORY.to_a.reverse.uniq[0,HISTORY_MAX_SIZE].reverse
  File.open(file, "w") do |f|
    history_no_dups.each do |line|
      f.puts line
    end
  end
end

.start(history_file = nil) ⇒ Object 



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# File 'lib/prompt/console/console_module.rb', line 15

def self.start(history_file = nil)
  # Store the state of the terminal
  stty_save = `stty -g`.chomp
  # ...and restore it when exiting
  at_exit do
    system('stty', stty_save)
    save_history history_file if history_file
  end

  # Exit immediately on Ctrl-C
  trap('INT') do
    puts
    exit
  end

  Readline.completion_proc = CompletionProc

  load_history history_file if history_file

  while line = Readline.readline(Prompt.application.prompt, true)
    begin
      words = split(line)
      next if words == []
      Prompt.application.exec words
    rescue CommandNotFound
      command_not_found line
    rescue => e
      command_exception e
    end
  end
end