Bug #78542 for Devel-REPL: Doesn't flush STDOUT after running code

Mon Jul 23 13:25:13 2012 leonerd-cpan [...] leonerd.org.uk - Ticket created

Subject:

Doesn't flush STDOUT after running code

print() without a linefeed isn't flushed after the command is run, before printing the next prompt. Perl defers it until EOF: pevans@paulevans:~ $ re.pl $ print "hello" 1 $ $ $ hello pevans@paulevans:~ -- Paul Evans

Mon Jul 23 13:43:47 2012 devel.chm.01 [...] gmail.com - Correspondence added

Subject:	Re: [rt.cpan.org #78542] Doesn't flush STDOUT after running code
Date:	Mon, 23 Jul 2012 13:43:34 -0400
To:	bug-Devel-REPL [...] rt.cpan.org
From:	Chris Marshall <devel.chm.01 [...] gmail.com>

How does this differ from the behavior of perl running the same from a file? On Mon, Jul 23, 2012 at 1:25 PM, Paul Evans via RT <bug-Devel-REPL@rt.cpan.org> wrote: Show quoted text

> Mon Jul 23 13:25:13 2012: Request 78542 was acted upon. > Transaction: Ticket created by PEVANS > Queue: Devel-REPL > Subject: Doesn't flush STDOUT after running code > Broken in: 1.003013 > Severity: Normal > Owner: Nobody > Requestors: leonerd-cpan@leonerd.org.uk > Status: new > Ticket <URL: https://rt.cpan.org/Ticket/Display.html?id=78542 > > > > print() without a linefeed isn't flushed after the command is run, > before printing the next prompt. Perl defers it until EOF: > > > pevans@paulevans:~ > $ re.pl > $ print "hello" > 1 > $ > > $ > > $ hello > pevans@paulevans:~ > > -- > > Paul Evans

Mon Jul 23 13:43:49 2012 The RT System itself - Status changed from 'new' to 'open'

Mon Jul 23 13:52:08 2012 leonerd-cpan [...] leonerd.org.uk - Correspondence added

On Mon Jul 23 13:43:47 2012, devel.chm.01@gmail.com wrote: Show quoted text

> How does this differ from the behavior > of perl running the same from a file?

Oh it's not really that different. It's just I feel that as Devel::REPL knows the expression is nominally "done" by the time it returns and before the next prompt is printed, it should flush STDOUT anyway before the next prompt is printed. -- Paul Evans

Mon Jul 23 13:56:06 2012 devel.chm.01 [...] gmail.com - Correspondence added

Subject:	Re: [rt.cpan.org #78542] Doesn't flush STDOUT after running code
Date:	Mon, 23 Jul 2012 13:55:56 -0400
To:	bug-Devel-REPL [...] rt.cpan.org
From:	Chris Marshall <devel.chm.01 [...] gmail.com>

I guess it all depends on whether you want the Devel::REPL shell to match a perl program or not (e.g., if you wish to cut and paste from a file into the command line). However, you can just set $|=1 and get the behavior desired. Maybe using say would work as well. --Chris On Mon, Jul 23, 2012 at 1:52 PM, Paul Evans via RT <bug-Devel-REPL@rt.cpan.org> wrote: Show quoted text

> Queue: Devel-REPL > Ticket <URL: https://rt.cpan.org/Ticket/Display.html?id=78542 > > > On Mon Jul 23 13:43:47 2012, devel.chm.01@gmail.com wrote:

>> How does this differ from the behavior >> of perl running the same from a file?

> > Oh it's not really that different. It's just I feel that as Devel::REPL > knows the expression is nominally "done" by the time it returns and > before the next prompt is printed, it should flush STDOUT anyway before > the next prompt is printed. > > -- > > Paul Evans

Mon Jul 23 13:56:15 2012 doy [...] tozt.net - Correspondence added

Subject:	Re: [rt.cpan.org #78542] Doesn't flush STDOUT after running code
Date:	Mon, 23 Jul 2012 12:56:02 -0500
To:	"devel.chm.01 [...] gmail.com via RT" <bug-Devel-REPL [...] rt.cpan.org>
From:	Jesse Luehrs <doy [...] tozt.net>

On Mon, Jul 23, 2012 at 01:43:49PM -0400, devel.chm.01@gmail.com via RT wrote: Show quoted text

> How does this differ from the behavior > of perl running the same from a file?

It's pretty standard practice for interactive programs (as opposed to scripts) to flush STDOUT before prompting the user for input (see getch() in curses, for instance). -doy

Mon Jul 23 13:58:18 2012 devel.chm.01 [...] gmail.com - Correspondence added

Subject:	Re: [rt.cpan.org #78542] Doesn't flush STDOUT after running code
Date:	Mon, 23 Jul 2012 13:58:09 -0400
To:	bug-Devel-REPL [...] rt.cpan.org
From:	Chris Marshall <devel.chm.01 [...] gmail.com>

True. I don't have a problem with setting $|=1 by default. It would allow users to switch back to the other behavior if desired.... On Mon, Jul 23, 2012 at 1:56 PM, Jesse Luehrs via RT <bug-Devel-REPL@rt.cpan.org> wrote: Show quoted text

> Queue: Devel-REPL > Ticket <URL: https://rt.cpan.org/Ticket/Display.html?id=78542 > > > On Mon, Jul 23, 2012 at 01:43:49PM -0400, devel.chm.01@gmail.com via RT wrote:

>> How does this differ from the behavior >> of perl running the same from a file?

> > It's pretty standard practice for interactive programs (as opposed to > scripts) to flush STDOUT before prompting the user for input (see > getch() in curses, for instance). > > -doy >