Curiosity: Perl File Extension in Emacs Config

Curiosity: Perl File Extension in Emacs Config

[Xah Lee]

A curiosity question.

emacs's “auto-mode-alist” has this value:

("\\.\\([pP]\\([Llm]\\|erl\\|od\\)\\|al\\)\\'" . perl-mode)
the regex there seems a bit wild. If i didn't get it wrong, then its like this

. ([pP] ( [Llm] | erl | od ) | al )
so it covers:

.pl
.perl
.pod
.pm
.al
plus SOME case variations. e.g. {.pL , .PL}.

what's the “.al” for?

is it necessary to include the “.pod”? because the perl-mode doesn't do any coloring with “.pod” files, nor cperl-mode. If there's a mode handing “.pod” file am guessing it won't be perl-mode.

also, is the “.perl” there necessary? Is that a accepted perl file suffix? (Just checked it's not in any file bundled with perl v5.10.1.)

would it be better if it's just

("\\.\\(p\\([lm]\\)\\)\\'" . perl-mode)

?

 Xah

Re: Curiosity: Perl File Extension in Emacs Config

[John Bokma]

Xah Lee <xahlee@gmail.com> writes:

> what's the “.al” for?

 "As an example, if POSIX.pm is located in
  /usr/local/lib/perl5/POSIX.pm, AutoLoader will look for perl
  subroutines POSIX in /usr/local/lib/perl5/auto/POSIX/*.al, where the
  .al file has the same name as the subroutine, sans package. If such a
  file exists, AUTOLOAD will read and evaluate it, thus (presumably)
  defining the needed subroutine. AUTOLOAD will then goto the newly
  defined subroutine."

http://perldoc.perl.org/AutoLoader.html

-- 
John Bokma                                                               j3b

Blog: http://johnbokma.com/        Perl Consultancy: http://castleamber.com/
Perl for books:    http://johnbokma.com/perl/help-in-exchange-for-books.html

Re: Curiosity: Perl File Extension in Emacs Config

[Xah Lee]

heh, John Bokma!

thanks.

 Xah

On Friday, July 13, 2012 12:55:25 PM UTC-7, John Bokma wrote:
> Xah Lee writes:
> 
> > what's the “.al” for?
> 
>  "As an example, if POSIX.pm is located in
>   /usr/local/lib/perl5/POSIX.pm, AutoLoader will look for perl
>   subroutines POSIX in /usr/local/lib/perl5/auto/POSIX/*.al, where the
>   .al file has the same name as the subroutine, sans package. If such a
>   file exists, AUTOLOAD will read and evaluate it, thus (presumably)
>   defining the needed subroutine. AUTOLOAD will then goto the newly
>   defined subroutine."
> 
> http://perldoc.perl.org/AutoLoader.html
> 
> -- 
> John Bokma                                                               j3b
> 
> Blog: http://johnbokma.com/        Perl Consultancy: http://castleamber.com/
> Perl for books:    http://johnbokma.com/perl/help-in-exchange-for-books.html

Re: Curiosity: Perl File Extension in Emacs Config

[John Bokma]

Xah Lee <xahlee@gmail.com> writes:

> heh, John Bokma!

Hey, you asked a genuine question ;-)

 and I am really a nice guy ... most of the time.

-- 
John Bokma                                                               j3b

Blog: http://johnbokma.com/        Perl Consultancy: http://castleamber.com/
Perl for books:    http://johnbokma.com/perl/help-in-exchange-for-books.html