Class: ReblShell

Inherits:
Object
  • Object
show all
Defined in:
lib/bud/rebl.rb

Overview

Static class that contains constants and functions for the rebl shell.

Constant Summary

@@histfile = 
File::expand_path("~/.rebl_history")
@@maxhistsize = 
100
@@escape_char = 
'/'
@@commands = 
{"tick" => [lambda {|lib,argv| lib.tick(argv[1].nil? ? 1 : Integer(argv[1]))},
 "tick [x]:\texecutes x (or 1) timesteps"],

    "run" => [lambda {|lib,_| lib.run},
              "run\ttick until quiescence, a breakpoint, or #{@@escape_char}stop"],

    "stop" => [lambda {|lib,_| lib.stop},
"stop\tstop ticking"],

    "lsrules" => [lambda {|lib,_| lib.rules.sort{|a,b| a[0] <=> b[0]}.each {|k,v| puts "#{k}: "+v}},
   "lsrules\tlist rules"],

    "rmrule" => [lambda {|lib,argv| lib.del_rule(Integer(argv[1]))},
  "rmrule x\tremove rule number x"],

    "lscollections" => [lambda {|lib,_| lib.state.sort{|a,b| a[0] <=> b[0]}.each {|k,v| puts "#{k}: "+v}},
         "lscollections\tlist collections"],

    "dump" => [lambda {|lib,argv| lib.dump(argv[1])},
"dump c\tdump contents of collection c"],

    "exit" => [lambda {|_,_| do_exit}, "exit\texit rebl"],

    "quit" => [lambda {|_,_| do_exit}, "quit\texit rebl"],

    "help" => [lambda {|_,_| pretty_help},
"help\tprint this help message"]}
@@abbrevs = 
@@commands.keys.abbrev
@@exit_message = 
"Rebellion quashed."

Class Method Summary collapse

Class Method Details

.command(c) ⇒ Object

lookup full command from abbreviation



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# File 'lib/bud/rebl.rb', line 144

def self.command(c)
  return @@abbrevs[c].nil? ? nil : @@commands[@@abbrevs[c]][0]
end

.rebl_loop(lib, noreadline = false) ⇒ Object

One step of the rebl shell loop: processes one rebl shell line from stdin and returns. May raise an Exception.



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# File 'lib/bud/rebl.rb', line 98

def self.rebl_loop(lib, noreadline=false)
  begin
    if noreadline
      line = gets
    else
      line = Readline::readline('rebl> ')
    end
    do_exit if line.nil?
    line.strip!
    return if line.empty?
    Readline::HISTORY.push(line) unless noreadline
    split_line = line.split(" ")
    if line[0..0] == @@escape_char then
      # Command
      split_line[0].slice! 0
      if command split_line[0]
        command(split_line[0]).call(lib, split_line)
      else
        puts "invalid command or ambiguous command prefix"
      end
    elsif is_collection? split_line[0]
      # Collection
      lib.add_collection(line)
    else
      # Rule
      lib.add_rule(line)
    end
  rescue Interrupt
    abort(do_exit)
  end
end

.run ⇒ Object

Starts a rebl shell. – This function is not covered by testcases, but setup and rebl_loop are. ++



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# File 'lib/bud/rebl.rb', line 62

def self.run
  lib = setup
  loop do
    begin
      rebl_loop(lib)
    rescue Exception => e
      puts "exception: #{e}"
      #puts e.backtrace
    end
  end
end

.setup ⇒ Object

Performs setup as part of starting a rebl shell, and returns the instance of LibRebl that is created; testcases call this directly.



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# File 'lib/bud/rebl.rb', line 76

def self.setup
  Signal.trap("INT") {do_exit}
  Signal.trap("TERM") {do_exit}

  ipport = ARGV[0] ? ARGV[0].split(":") : []
  lib = LibRebl.new(*[(ipport[0] or "localhost"), (ipport[1] or 0)])
  setup_history

  comp = proc do |s|
    @@commands.keys.map do |c|
      @@escape_char+c
    end.grep( /^#{Regexp.escape(s)}/ )
  end
  Readline.completion_append_character = ' '
  Readline.completion_proc = comp

  welcome
  return lib
end

.setup_history ⇒ Object

Reads permanent history from @@histfile. This code is pretty much the same as irb's code.



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# File 'lib/bud/rebl.rb', line 132

def self.setup_history
  begin
    if File::exists?(@@histfile)
      lines = IO::readlines(@@histfile).collect { |line| line.chomp }
      Readline::HISTORY.push(*lines)
    end
  rescue Exception
    puts "Error when configuring permanent history: #{$!}"
  end
end