print message if user does nothing for x seconds?
Ben Thomas
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
Hal Fulton
This is tricky on Windows... what platform are you on?
Hal
Ben Thomas
Windows... D'oh!
Is there any better ways to get input from the user that'd make is easier?
ara.t....@noaa.gov
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
--
my religion is very simple. my religion is kindness. -- the dalai lama
David Vallner
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 Vallner
Ben Thomas
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.
Gabriele Marrone
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" }
--
Gabriele Marrone
Ben Thomas
Thanks for the reply. Unfortunately I am on windows.
Hal Fulton
>
> 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