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The (e) glob qualifier and NO_NOMATCH
- X-seq: zsh-workers 22504
- From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
- To: zsh-workers@xxxxxxxxxx
- Subject: The (e) glob qualifier and NO_NOMATCH
- Date: Wed, 21 Jun 2006 06:49:43 -0700
- Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm
It occurs to me that, unlike most of the other glob qualifiers, (e:cmd:)
doesn't necessarily need any existing filename on which to operate.
Consider by comparison _path_files in the completion code, which includes
a hack to force auto-mounting. Wouldn't it be nice to be able to write a
function "forcemount" that matches a pattern against /etc/hosts or NIS
and mounts all those filesystems? Then you could use
for remote in /net/r*(+forcemount); do ...
This currently doesn't work, because once "r*" fails to match anything
in /net, the qualifiers are ignored and the entire string is returned as
the result. Instead we'd need to call "forcemount" with REPLY set to
the path segment pattern "r*".
Unfortunately it looks like this would need a pretty large reworking of
the globbing code. The original source string of path segment patterns
isn't kept around anywhere that I immediately see, and NO_NOMATCH is
handled only after the entire scan has completed. Further, qualifiers
don't seem to have the order-dependence that one might expect:
print *(e:'reply=(${REPLY}x)':/)
first finds all directories and then appends "x" to their names, rather
than failing entirely because there are no directories having the names
that result after appending an x to an existing name, and
print *(e:'reply=(${REPLY}x)':e:'reply=(${REPLY}y)':)
does not produce names with "xy" appended, only with "y".
For the time being, I guess this is just food for thought.
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