[Omake] $" " inside of a lazy expansion $`( ) still expands $()

[Jason Hickey]

Hi David,

Sorry about the delay, I've been traveling.

I just noticed this too.  It definitely looks like a bug.  I'll take a 
look and see what I can find.

Jason

David Cooke wrote:
> Hi,
> 
> I came across this trying to figure out why OCAMLPACKS wasn't working
> (this is with the 0.9.8.x branch in svn). Variables $() inside of
> omake quotes $" " inside of a lazy expansion $`() are expanded at
> definition time, not lazily.
> 
> Here's a transcript from osh to show the problem:
> 
> % FILES[] = a b c
> - : <array
>       "a" : Sequence
>       "b" : Sequence
>       "c" : Sequence>
>       : Array
> % SUF = .c
> - : ".c" : Sequence
> % X = $`(addsuffix $(SUF), $(FILES))
> - : $(apply global.addsuffix $(apply global.SUF) $(apply global.FILES))
> % echo($X)
> a.c b.c c.c
> % # add a omake quotation with $" "
> % X = $`(addsuffix $"$(SUF)", $(FILES))
> - : $(apply global.addsuffix <data ".c"> : String $(apply global.FILES))
> % # uh oh, that doesn't look good. And it isn't...
> % SUF = .x
> - : ".x" : Sequence
> % echo($X)
> a.c b.c c.c
> 
> In the second assignment to X, I use $"$(SUF)", which ends up getting
> expanded at definition time, not lazily as the $`() should make it.
> 
> PREFIXED_OCAMLPACKS uses this construct, so assigning to OCAMLPACKS
> afterwards doesn't do anything. I've fixed this in my version by just
> removing the quotes in PREFIXED_OCAMLPACKS (since commas are used as
> the separators).
> 
> -- 
> David M. Cooke
> david.m.cooke at gmail.com
> _______________________________________________
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> Omake at metaprl.org
> https://lists.metaprl.org/mailman/listinfo/omake


-- 
Jason Hickey                  http://www.cs.caltech.edu/~jyh
Caltech Computer Science      Tel: 626-395-6568 FAX: 626-792-4257