sleep-for does not work as expected - or perhaps my expection is incorrect

sleep-for does not work as expected - or perhaps my expection is incorrect

[C K Kashyap]

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Hi,
(defun somefun ()
  (insert "Hello ")
  (sleep-for 1)
(insert "world\n"))

When I invoke "somefun" by doign -  M-: (somefun) <return>

I see that "Hello world" gets printed after 1 second instead of printing
Hello and then printing world after one second.

What can I do to get the script to write out "hello" first and then wait for
a second and then write out world?

Regards,
Kashyap

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Re: sleep-for does not work as expected - or perhaps my expection is incorrect

[Deniz Dogan]

On 2011-07-12 16:42, C K Kashyap wrote:
> (defun somefun ()
>    (insert "Hello ")
>    (sleep-for 1)
> (insert "world\n"))

The docstring for `sleep-for' says: "Pause, without updating display, 
for SECONDS seconds."

Throw a (redisplay t) after the first insertion and it should work.

Deniz

Re: sleep-for does not work as expected - or perhaps my expection is incorrect

[PJ Weisberg]

On Tue, Jul 12, 2011 at 7:42 AM, C K Kashyap <ckkashyap@gmail.com> wrote:
> Hi,
> (defun somefun ()
>   (insert "Hello ")
>   (sleep-for 1)
> (insert "world\n"))
>
> When I invoke "somefun" by doign -  M-: (somefun) <return>
>
> I see that "Hello world" gets printed after 1 second instead of printing
> Hello and then printing world after one second.
>
> What can I do to get the script to write out "hello" first and then wait for
> a second and then write out world?
>
> Regards,
> Kashyap

(defun somefun ()
  (insert "Hello ")
  (redisplay t)
  (sleep-for 1)
  (insert "world\n"))

Your function *is* waiting one second before it writes out world--but
Emacs is waiting for your function to finish before it tries to show
any of the changes it's made to the buffer. :-)

-PJ

Re: sleep-for does not work as expected - or perhaps my expection is incorrect

[suvayu ali]

On Tue, Jul 12, 2011 at 7:39 PM, PJ Weisberg
<pj@irregularexpressions.net> wrote:
> Your function *is* waiting one second before it writes out world--but
> Emacs is waiting for your function to finish before it tries to show
> any of the changes it's made to the buffer. :-)
>

(progn (message "Hello")(sleep-for 1)(message "world"))

This, for example, clearly shows that emacs is waiting.

-- 
Suvayu

Open source is the future. It sets us free.

Re: sleep-for does not work as expected - or perhaps my expection is incorrect

[Perry Smith]

On Jul 12, 2011, at 12:24 PM, Deniz Dogan wrote:

> On 2011-07-12 16:42, C K Kashyap wrote:
>> (defun somefun ()
>>   (insert "Hello ")
>>   (sleep-for 1)
>> (insert "world\n"))
> 
> The docstring for `sleep-for' says: "Pause, without updating display, for SECONDS seconds."
> 
> Throw a (redisplay t) after the first insertion and it should work.

I'm use to 'sit-for' ... i.e.

(defun somefun ()
  (insert "Hello ")
  (sit-for 1)
(insert "world\n"))

With that you see the Hello... one second pause, then world.

HTH,
pedz