I recently discovered that I can create a .irbrc file to run setup for
my irb/console. I am in love.
My current .irbrc is:
require ‘irb/completion’
require ‘map_by_method’
require ‘what_methods’
require ‘pp’
IRB.conf[:AUTO_INDENT]=true
Explanation of the different libraries:
http://drnicwilliams.com/2006/10/12/my-irbrc-for-consoleirb/
Does anyone any interesting things in their .irbrc file?
Nic
On 12/10/06, Dr Nic [email protected] wrote:
I haven’t used it but Wirble(http://pablotron.org/software/wirble/)
looks pretty cool.
Farrel
Farrel L. wrote:
On 12/10/06, Dr Nic [email protected] wrote:
I haven’t used it but Wirble(http://pablotron.org/software/wirble/)
looks pretty cool.
Very nifty indeed.
On 10/12/06, Dr Nic [email protected] wrote:
Does anyone any interesting things in their .irbrc file?
I don’t know why I hadn’t thought of it before but I just added:
def show_regexp(a, re)
if a =~ re
“#{$`}<<#{$&}>>#{$'}”
else
“no match”
end
end
class Regexp
def show_match(a)
show_regexp(a, self)
end
end
–
Rick DeNatale
My blog on Ruby
http://talklikeaduck.denhaven2.com/
IPMS/USA Region 12 Coordinator
http://ipmsr12.denhaven2.com/
Visit the Project Mercury Wiki Site
http://www.mercuryspacecraft.com/
Nice, thanks!
You may find it useful to extend your #what? with #what_returns?(x)
[1, 2, 3].what_returns?(1) #=> [ :first ]
Used in some method browsers in Squeak. Could be extended in all kinds
of
ways - state change, parameters,…
On 10/12/06, Dr Nic [email protected] wrote:
I recently discovered that I can create a .irbrc file to run setup for
my irb/console. I am in love.Does anyone any interesting things in their .irbrc file?
Sure, see
http://blog.nicksieger.com/articles/2006/04/23/tweaking-irb
Cheers,
/Nick
On Thu, 2006-10-12 at 21:32 +0900, Dr Nic wrote:
I recently discovered that I can create a .irbrc file to run setup for
my irb/console. I am in love.…
Does anyone any interesting things in their .irbrc file?
class Array
alias :__orig_inspect :inspect
def inspect
(length > 20) ? “[ … #{length} elements … ]” : __orig_inspect
end
end
class Hash
alias :__orig_inspect :inspect
def inspect
(length > 20) ? “{ … #{length} keys … }” : __orig_inspect
end
end
HISTFILE = “~/.irb.hist”
MAXHISTSIZE = 100
begin
if defined? Readline::HISTORY
histfile = File::expand_path( HISTFILE )
if File::exists?( histfile )
lines = IO::readlines( histfile ).collect {|line| line.chomp}
puts “Read %d saved history commands from %s.” %
[ lines.nitems, histfile ] if $DEBUG || $VERBOSE
Readline::HISTORY.push( *lines )
else
puts “History file ‘%s’ was empty or non-existant.” %
histfile if $DEBUG || $VERBOSE
end
Kernel::at_exit {
lines = Readline::HISTORY.to_a.reverse.uniq.reverse
lines = lines[ -MAXHISTSIZE, MAXHISTSIZE ] if lines.nitems >
MAXHISTSIZE
$stderr.puts “Saving %d history lines to %s.” %
[ lines.length, histfile ] if $VERBOSE || $DEBUG
File::open( histfile, File::WRONLY|File::CREAT|File::TRUNC ) {|
ofh|
lines.each {|line| ofh.puts line }
}
}
end
end
which):
def ri arg
puts ri #{arg}
end
class Module
def ri(meth=nil)
if meth
if instance_methods(false).include? meth.to_s
puts ri #{self}##{meth}
else
super
end
else
puts ri #{self}
end
end
end
On 10/12/06, Dr Nic [email protected] wrote:
Explanation of the different libraries:
http://drnicwilliams.com/2006/10/12/my-irbrc-for-consoleirb/Does anyone any interesting things in their .irbrc file?
Mine is rather large and in flux right now but I will post a few
nuggets from it bellow:
require ‘rubygems’
module ObjectEnhancer
def clone!
self.clone rescue self
end
def tap
yield self
self
end
def _
yield if block_given?
nil
end
end
class Object
include ObjectEnhancer
end
class Object
def pp(*a, &b) # pass the block just-in-case this changes.
require ‘pp’
pp(*a, &b)
end
end
require ‘irb/completion’
IRB.conf[:USE_READLINE] = true
require ‘irb/ext/save-history’
IRB.conf[:SAVE_HISTORY] = 1000
IRB.conf[:EVAL_HISTORY] = 100
IRB.conf[:PROMPT][:CUSTOM] = {
:PROMPT_N => ">> ",
:PROMPT_I => ">> ",
:PROMPT_S => nil,
:PROMPT_C => " > ",
:RETURN => “=> %s\n”
}
IRB.conf[:PROMPT_MODE] = :CUSTOM
def ri(*names)
system(“ri #{names.map {|name| name.to_s}.join(” “)}”)
end
def reset_irb
at_exit {exec($0)} # first registered is last to run
at_exit {yield if block_given?}
do it :S… who wants to rewrite irb?
if num = IRB.conf[:SAVE_HISTORY] and (num = num.to_i) > 0
if hf = IRB.conf[:HISTORY_FILE]
file = File.expand_path(hf)
end
file = IRB.rc_file(“_history”) unless file
open(file, ‘w’) do |file|
hist = IRB::HistorySavingAbility::HISTORY.to_a
file.puts(hist[-num…-1] || hist)
end
end
throw :IRB_EXIT, 0
end
def clear
eval “def clear; print #{clear.inspect} end”
clear
end
private :clear
def serve_files(opts = {})
require ‘webrick’
opts[:host] ||= Socket.gethostname
opts[:dir] ||= Dir.pwd
opts[:port] ||= opts[:dir].hash % 1000 + 10000
opts[:log] ||= Nop.new # hidden and simple.
server = WEBrick::HTTPServer.new(
:Host => opts[:host],
:Port => opts[:port],
:DocumentRoot => opts[:dir],
:Logger => opts[:log]
)
trap(“INT”) {server.shutdown}
puts “Serving "#{opts[:dir]}" at
http://#{opts[:host]}:#{opts[:port]}/”
server.start
nil
rescue
puts “Failed to start server! See $webrick_error for the exception.”
$webrick_error = $!
nil
end
private :serve_files
def ssh_session(opts = {})
puts “Note: You must ‘sleep’ in order for the event loop to run in
irb.” if require ‘net/ssh’
dynamic_session_class = Class.new do
@@default_opts = {
:user => ENV[‘USER’] || ENV[‘USERNAME’],
:port => 22
}.freeze
def initialize(opts = {}, aux = {})
opts, opts[:host] = aux, opts unless Hash === opts
opts = aux.merge opts
opts = @@default_opts.merge opts
@shutdown = false
@queue = []
ready = false
Thread.new {
begin
Net::SSH.start(opts[:host],
:username => opts[:user],
:password => opts[:password],
:port => opts[:port]
) do |session|
ready = true
loop {
break if self.shutdown?
self.process(session)
session.loop
sleep 0.01
}
end
rescue
puts "Failed while running ssh session! See $ssh_error for
the exception."
$ssh_error = $!
ensure
ready = true
end
}
sleep 0 until ready
end
def shutdown?
@shutdown
end
def shutdown
@shutdown = true
end
def execute(&blk)
raise "Session shutdown" if shutdown?
@queue << blk
nil
end
def process(session)
while proc = @queue.pop
proc.call(session)
end
end
def forward_local(port, host, aux_port = port)
execute {|session|
session.forward.local('0.0.0.0', port, host, aux_port)
}
end
alias outgoing forward_local
def forward_remote(port, host, aux_port = port)
execute {|session|
session.forward.remote_to(port, host, aux_port)
}
end
def shell
require 'termios'
puts "Note: You will need to interrupt 'sleep' when your shell
is done (usually ^C)."
execute {|session|
stdin_buffer = lambda do |enable|
attrs = Termios::getattr($stdin)
if enable
attrs.c_lflag |= Termios::ICANON | Termios::ECHO
else
attrs.c_lflag &= ~(Termios::ICANON | Termios::ECHO)
end
Termios::setattr($stdin, Termios::TCSANOW, attrs)
end
begin
stdin_buffer[false]
shell = session.shell.open(:pty => true)
loop do
break unless shell.open?
if IO.select([$stdin],nil,nil,0.01)
data = $stdin.sysread(1)
shell.send_data data
end
$stdout.print shell.stdout while shell.stdout?
$stdout.flush
end
ensure
stdin_buffer[true]
end
}
sleep
end
alias incoming forward_remote
end
Object.const_set(‘DynamicSSHSession’, dynamic_session_class) unless
Object.constants.include? ‘DynamicSSHSession’
dynamic_session_class.new(opts)
rescue
puts “Failed to create an ssh session! See $ssh_error for the
exception.”
$ssh_error = $!
end
private :ssh_session
class Array
def sequence(i = 0, *a)
return [a] if i == size
self[i].map {|x|
sequence(i+1, *(a + [x]))
}.inject([]) {|m, x| m + x}
end
end
class Symbol
def to_proc
lambda {|*args| args.shift.send(self, *args)}
end
end
module Blank
def self.append_features(base)
base.module_eval {
instance_methods.each {|m| undef_method m unless m =~ /^__/}
}
end
end
class It < Proc
instance_methods.each {|m| undef_method m unless m =~ /^__/}
def method_missing(*args, &blk)
It.new {|x|
Proc.instance_method(:call).bind(self).call(x).send(*args, &blk)}
end
end
def it
if block_given?
It.new
else
It.new {|x| x}
end
end
private :it
That is about half of it. I’ve got more stuff like gray number stuf,
unbound method extensions, and some new meta-programming stuff but it
all needs a little more work first. I should also note that I wrap my
irbrc file with a begin rescue end. The rescue just prints the
presence of an error and then shoves $! into $irbrc_error. This is
nice for occasions when you might be trying out new 1.9 builds or use
rails (they don’t correctly initialize IRB so it causes failed loads
of irbrc – keeps the output a little cleaner).
I will probably do another clean-up before RubyConf so we can all
share .irbrc’s ;-). I’ll probably end up removing more things then I
add (i.e. I really don’t use Symbol#to_proc that much).
One last thing, I was wondering if anyone would be interested in a
series of gems that act as automatic irb plugins? it might be fun to
gemify some of these things.
Brian.
Ross B. wrote:
if instance_methods(false).include? meth.to_s puts `ri #{self}##{meth}` else super end else puts `ri #{self}` endend
end
I think that came out of my .irbrc, but it’s always missed one thing:
a nice notation for class methods:
…
irb(main):015:0> IO.ri “open”
More than one method matched your request. You can refine
your search by asking for information on one of:
…
Of course you can always do this:
irb(main):016:0> ri “IO.open”
--------------------------------------------------------------- IO::open
IO.open(fd, mode_string=“r” ) => io
IO.open(fd, mode_string=“r” ) {|io| block } => obj
@everyone - that is a great dump ideas. Very cool. (sorry for not
replying earlier - Ruby Forum’s email notifier seemed to have been
playing up).
Re: RubyConf - It’d be great to see an irb_tools gem come out of the
conference now! 
Nic
On 10/18/06, Dr Nic [email protected] wrote:
@everyone - that is a great dump ideas. Very cool. (sorry for not
replying earlier - Ruby Forum’s email notifier seemed to have been
playing up).Re: RubyConf - It’d be great to see an irb_tools gem come out of the
conference now!
It’s sad you mention that. Ironic too [1]. I had to cancel my trip
yesterday on request from the company I work for. I’ll definitely miss
going but I’ll avoid thinking about it to avoid souring the rest my
week too badly. So… please take great notes!
I still want to sit down and clean up my irb stuff into plugins. Maybe
I’ll setup a Rubyforge project after crunch time has died down at
work. BUT don’t let that stop anyone from beating me to the punch.
Brian.
[1] I have been sad to see many friends cancel their trips as well
telling them I would miss their attendance.
Dr Nic wrote:
Does anyone any interesting things in their .irbrc file?
This is useful sometimes:
def dump_history(file=nil)
if file
File.open(file, “w”) do |f|
f.puts IRB::ReadlineInputMethod::HISTORY.to_a
end
else
puts IRB::ReadlineInputMethod::HISTORY.to_a
end
end
And there is this gem from Logan C.:
def reset_irb
exec($0)
end
I’ve been using this guy for code that prints copious output to the
terminal. I’m sure it could be improved a bit, but I’ve found it
useful.
def less
require ‘stringio’
$stdout, sout = StringIO.new, $stdout
yield
$stdout, str_io = sout, $stdout
IO.popen(‘less’, ‘w’) do |f|
f.write str_io.string
f.flush
f.close_write
end
end
I tend to use that in conjunction with yaml dumps to look at complex
data structures, rather than pp, but that would work just as well.
def yp(*data)
require ‘yaml’
puts YAML::dump(*data)
end
Give them a whirl like so:
$ irb
less { yp IRB.conf }
Brian M. wrote:
On 10/18/06, Dr Nic [email protected] wrote:
@everyone - that is a great dump ideas. Very cool. (sorry for not
replying earlier - Ruby Forum’s email notifier seemed to have been
playing up).Re: RubyConf - It’d be great to see an irb_tools gem come out of the
conference now!It’s sad you mention that. Ironic too [1]. I had to cancel my trip
yesterday on request from the company I work for. I’ll definitely miss
going but I’ll avoid thinking about it to avoid souring the rest my
week too badly. So… please take great notes!
I misconstrude my attendence - I’m not able to go. Went to Railsconf,
wife said “that will be sufficient for you for the year” (we’re in
Europe). Bummer. But she’s excited about Railsconf2007 - she wants to go
on holidays in California 
I still want to sit down and clean up my irb stuff into plugins. Maybe
I’ll setup a Rubyforge project after crunch time has died down at
work. BUT don’t let that stop anyone from beating me to the punch.
Remember to use newgem scaffolding for all your new gem generation needs
http://drnicwilliams.com/2006/10/11/generating-new-gems/
Nic
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