From: Bart Schaefer <schaefer@brasslantern.com>
To: zsh-users <zsh-users@sunsite.dk>
Subject: Re: e:: with an array ?
Date: Tue, 22 Aug 2006 20:26:16 -0700 [thread overview]
Message-ID: <060822202616.ZM7566@torch.brasslantern.com> (raw)
In-Reply-To: <20060822204536.GA11639@ulpmm.u-strasbg.fr>
On Aug 22, 10:45pm, Marc Chantreux wrote:
}
} print -l *(e:true:)
}
} works but
}
} x=(*); print -l ${(e:true:)x}
}
} is an error.
In general there's no correlation between glob qualifiers and parameter
expansion flags, so you shouldn't expect that. E.g. ${(U)x} means to
convert $x to uppercase, but *(U) means to match files owned by the
current effective user ID.
One could argue that given (N) to turn on NULL_GLOB and (D) to turn
on GLOB_DOTS, there should also be a way to turn on NO_NOMATCH so that
one could force an (e::) qualifier to be applied to nonexistent files.
However, NO_NOMATCH normally means that the entire pattern _including_
qualifiers must be preserved unchanged on a match failure, so turning
it off within the qualifiers is a logical quandary. Note also that
even with NO_NOMATCH, *(e:false:) fails with "no such file."
} I haven't found an alternative in the doc so i wonder again
} (http://www.zsh.org/mla/users//2006/msg00193.html) if there is a kinda
} perl grep :-)
If you mean
grep { func } @x
as in
map { if (func) { $_ } else { () } } @x
then no, there is no direct zsh equivalent, except in the special case
where func is the zsh equivalent of m/pattern/.
With extendedglob set, zsh does have ${x/(#b)(*)/$(func $match)},
which can be made to behave mostly like perl map. If func is limited
to things that can be expressed as parameter expansion operations, you
can change $(...) to ${...}, save a fork, and annoy Matthias Kopferman.
next prev parent reply other threads:[~2006-08-23 3:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-22 20:45 Marc Chantreux
2006-08-23 3:26 ` Bart Schaefer [this message]
2006-08-23 8:48 ` Marc Chantreux
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