Print message if user does nothing for x seconds?

Hi all,

Only just started using ruby so this may be really simple to do, but
here goes:

I’m trying to write a program that asks a user to enter their sex using
“gets” but if the user doesn’t type anything for about 5 seconds I want
to print a message, like “Please enter something…” then go back to the
gets prompt. I’ve tried using the “sleep x” method but it doesn’t seem
to work because once gets has been initiated it gets stuck there until
something is entered.

Oh I don’t have to use gets, but this is the only method of input I’m
aware of at the moment

Hope this makes sense,
Ben

Ben T. wrote:

something is entered.

Oh I don’t have to use gets, but this is the only method of input I’m
aware of at the moment

This is tricky on Windows… what platform are you on?

Hal

Hal F. wrote:

doesn’t seem to work because once gets has been initiated it gets
stuck there until something is entered.

Oh I don’t have to use gets, but this is the only method of input I’m
aware of at the moment

This is tricky on Windows… what platform are you on?

Hal

Windows… D’oh!

Is there any better ways to get input from the user that’d make is
easier?

On Sun, 12 Nov 2006, Ben T. wrote:

entered.

Oh I don’t have to use gets, but this is the only method of input I’m aware
of at the moment

Hope this makes sense,
Ben

if you’re on windows give up now. otherwise try this:

 harp:~ > cat a.rb
 require 'timeout'

 def prompt question, opts = {}
   timeout = Integer(opts['timeout'] || opts[:timeout] || 42)
   max = Integer(opts['max'] || opts[:max] || 42)
   default = opts['default'] || opts[:default]
   prod = (opts['prod'] || opts[:prod] || 'hey! wake up!').to_s

   answer = default
   prompt = "\r#{ question }: "
   prod = "\r#{ prod }"

   if prompt.size > prod.size
     prod += (' ' * (prompt.size - prod.size))
   end
   if prod.size > prompt.size
     prompt += (' ' * (prod.size - prompt.size))
   end

   max.times{
     begin
       print prompt
       STDOUT.flush
       Timeout::timeout(timeout){ answer = gets }
       break
     rescue Timeout::Error
       print prod
       STDOUT.flush
       sleep 2
     end
   }

   answer
 end

 answer = prompt 'the question', 'timeout' => 5, 'max' => 2

 p 'answer' => answer

-a

David V. wrote:

to work because once gets has been initiated it gets stuck there until
Read the data in a thread, or use nonblocking io (currently crude at
best, with only eventmachine to help as a project that shown up on my
radar - and that seems to be oriented towards networking)

Also, what you describe there is a very rude thing to do to your user,
basically you’re accusing them of having no attention span and the
program is attention-seeking to compensate.

David V.

Yeah, I’d never even think of doing it normally, it was just put in a
small program specification for uni. It’s not an assignment or anything
so I’ll probably just leave that part out if it’s hard to implement.

The part of the specification was:

3. Keep the program running until the user shouts “BYE”. If, 			while

the program is running, nothing is happening Grandma should shout
“WHAT? CAT GOT YOUR TONGUE? SPEAK UP, I SAY!"

I’ll just leave the “cat got your tongue” part out for now. Managed to
keep the program running until the user shouts “BYE” easy enough, just
the second part causing problems.

Thanks for the help.

On 11/nov/06, at 21:07, [email protected] wrote:

    end
  }

  answer
end

answer = prompt 'the question', 'timeout' => 5, 'max' => 2

p 'answer' => answer

Nice! May I suggest adding an optional validation block?
I hope you don’t mind if I slightly modify your code:

def prompt question, opts = {}, &validation
timeout = Integer(opts[‘timeout’] || opts[:timeout] || 42)
max = Integer(opts[‘max’] || opts[:max] || 42)
default = opts[‘default’] || opts[:default]
prod = (opts[‘prod’] || opts[:prod] || ‘hey! wake up!’).to_s
invalid = (opts[‘invalid’] || opts[:invalid] || ‘try again’).to_s

answer = default
prompt = "\r#{ question }: "
prod = “\r#{ prod }”

if prompt.size > prod.size
prod += (’ ’ * (prompt.size - prod.size))
end
if prod.size > prompt.size
prompt += (’ ’ * (prod.size - prompt.size))
end

max.times{
begin
print prompt
STDOUT.flush
Timeout::timeout(timeout){ answer = gets }
if validation && !validation.call(answer)
answer = default
puts invalid
else
break
end
rescue Timeout::Error
print prod
STDOUT.flush
sleep 2
end
}

answer
end

answer = prompt(‘the question’, ‘timeout’ => 5, ‘max’ => 2) { |s| s
== “valid input\n” }

[email protected] wrote:

back to the gets prompt. I’ve tried using the “sleep x” method but it
if you’re on windows give up now. otherwise try this:
answer = default
max.times{
}

-a

Thanks for the reply. Unfortunately I am on windows.

Ben T. wrote:

something is entered.

Oh I don’t have to use gets, but this is the only method of input I’m
aware of at the moment

Hope this makes sense,
Ben

Read the data in a thread, or use nonblocking io (currently crude at
best, with only eventmachine to help as a project that shown up on my
radar - and that seems to be oriented towards networking)

Also, what you describe there is a very rude thing to do to your user,
basically you’re accusing them of having no attention span and the
program is attention-seeking to compensate.

David V.

Ben T. wrote:

Thanks for the reply. Unfortunately I am on windows.

Actually I think this should partially work on Windows.

As I recall, I found that as long as the user typed
nothing, timeout was possible. But if the user
typed a character or more and just didn’t finish, it
wouldn’t time out.

Hal

This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.

| Privacy Policy | Terms of Service | Remote Ruby Jobs