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Postings from July 2014
On 7/24/14, Rafael Garcia-Suarez <rgs@consttype.org> wrote:
> I believe that this was discussed here some years ago, and that this
> was suggested by TomC. Anyway, I pushed a patch on rgs/nomagicopen.
> The patch is incomplete as it lacks docs and tests. I welcome feedback
> on the intent of the feature.
>
> commit 7f5bb3418c4fc2d6e2523bf918a7d9e33f9a7acc
> Author: Rafael Garcia-Suarez <rgs@consttype.org>
> Date: Thu Jul 24 17:43:29 2014 +0200
>
> Introduce the double-diamond operator <<>>
>
> This operator works like <> or <ARGV>, as it reads the list of file
> names to open from the command-line arguments. However, it disables
> the magic-open feature (that forks to execute piped commands) :
>
> $ bleadperl -e 'while(<>){print}' 'echo foo |'
> foo
> $ bleadperl -e 'while(<<>>){print}' 'echo foo |'
> Can't open echo foo |: No such file or directory at -e line 1.
>
I definitely like the idea in some form, though I'll sit out the
feature/syntax discussion for the moment. I want to clarify the
framing of the feature though:
When you say 'disable magic-open', a more precise description might be
'Changes ARGV handling to use 3 arg open instead of 2 arg open',
correct? That way its a little more clearly tied to 2 arg / 3 arg
open discussions and makes it easier to spot the edge cases.
Phrasing it that way makes it a little clearer where the magic comes
from and what other things would be affected; for instance (I can't
test this right now)
perl -e 'print while(<<>>)' '-'
would now only work on a file literally named '-'?
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