Re^3: showPerlDirConfig

Aristotle wrote:

my ($binary) = file_name_is_absolute($^X)
    ? $^X
    : (
        grep -x,
        map catfile($_,$^X),
        split /\Q$Config::Config{path_sep}/, $ENV{PATH}
    );
[download]

As far as I can see, you are calling grep in a scalar context and would normally be putting "1" (0x1) into $binary using this code. Am I wrong?

I (being the one who has to maintain this code) kept to my own version of what is less convoluted / obfuscated, but have added credits in the POD for pointing me towards a better code block for getting the fully-qualified path to the perl interpreter. Thank you.

-- 
use PerlMonk::Tye qw(:wisely);

Comment on Re^3: showPerlDirConfig Download Code

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Re^5: showPerlDirConfig by Aristotle (Chancellor) on Aug 07, 2003 at 15:47 UTC
No. `my ($binary)` is list context. `my $binary` would be scalar context. So what happens here is that the first match from the grep is stored in `$binary` and the rest, if any, are discarded. Makeshifts last the longest.	[reply]
Re^3: showPerlDirConfig by Intrepid (Curate) on Aug 07, 2003 at 17:40 UTC
Aristotle wrote: No. my ($binary) is list context. ++ for being more idiomatic than I. Good follow-up. I must cantankerously contend that since I don't believe perl should parse this way, though, I will still refuse to code with that usage. Tangent: You see, it's too obscure, IMHO. In some contexts, people have thought that merely having parenthesis made a list context, when in fact it is comma operators that are doing so (as per a famous rant by mjd that I have no reference to at this moment); so in my book this idiom is truly obfuscated. Yes, it is handy to have a way to say `my ($scalar)=` to force a list context, but as syntactic sugar it tastes remarkably sour to my buds. It's a dank dark corner of perl that I want to stay away from. Still, very ++ for explaining to me. At least I may remember what I am looking at next time I see it, even if I choose not to use it. me -- use PerlMonk::Tye qw(:wisely);	[reply]
Re^7: showPerlDirConfig by Aristotle (Chancellor) on Aug 07, 2003 at 17:45 UTC
Sure. `my $binary = file_name_is_absolute($^X) ? $^X : ( grep -x, map catfile($_,$^X), split /\Q$Config::Config{path_sep}/, $ENV{PATH} )[0];` [download] Makeshifts last the longest.	[reply] [d/l]

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