$pgn->comments was Re: DCPM: perltutopen blues....

[Simon Waters]

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Matthew Browning wrote:
>
> Perl filehandles look pretty much the same as in C.  The ones you are
> dealing with are hidden behind two layers of obscurity.

Keep telling me that it isn't just me being thick ;-)

> Use cperl-mode, not the default perl-mode with GNU Emacs.

Hmm okay when I figure out how to change mode.... I'd already found
stuff in cperl-mode that sounded good whilst searching the help, so it
had made the "someting to look at later list" already. I have a zillion
little emacs questions, but I think they are probably best explained at
a LUG meet or similar.

The script is basically working as expected now, oh and Giuseppe has
updated Chess::PGN::Parse a couple of times to suit my needs (how is
that for free support!).

One gotcha whose syntax has escaped me (or perhaps I need another new
Parse.pm?), is the case where Chess::PGN::Parse doesn't find any
comments in the original game. Then the hash $pgn->comments is
undefined, and attempts to append new comments fail (can't put hash
pairs into a non-existent hash, I don't think we can blame the language
design for that one).

I assume I need to create an empty hash and assign it to the Parse
object, before attempting to append comments (this I assume is quicker
than checking if it is defined each time, but the "how" not the "when"
is escaping me).

I was trying something like "%{$pgn->comments} = [ my %empty ]", but no
joy...
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