On Mon, Feb 21, 2011 at 18:53, Beni Cherniavsky-Paskin <[email protected]>wrote:
> I dimly recall Axel explaining that commands are expanded in a separate
> pass so they won't have to be run many times (because commands can be
> expensive and/or have side effects).
>
Ah, that makes sense (somewhat). Expansion creates the carthesian product of
the lists in the variables/commands:
> set foo first second
> set bar alpha beta
> echo $foo-$bar
first-alpha second-alpha first-beta second-beta
A naive implementation would need to run expensivecommand in "echo
$foo-(expensivecommand)" multiple times. But it wouldn't be too hard to
evaluate the variables/commands in order and only combine them once the
results of all commands/variables was known. Guess fish doesn't do that.
(didn't check the source)
Jan
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