From: Bart Schaefer <schaefer@brasslantern.com>
To: Zsh Users <zsh-users@zsh.org>
Subject: Re: Feature request (@M):# with context matches
Date: Sat, 30 Jan 2016 12:42:09 -0800 [thread overview]
Message-ID: <160130124209.ZM10392@torch.brasslantern.com> (raw)
In-Reply-To: <160130085456.ZM9730@torch.brasslantern.com>
On Jan 30, 8:54am, Bart Schaefer wrote:
}
} while (( ( hit = $list[(i)*$search_pattern*] ) < $#list ))
} do
} print -r -- $list[hit-3,hit+3]
} shift $hit list
} done
}
} with some appropriate checking that (hit-3) doesn't become negative and
} wrap around to the other end of the array, and other foo to manage the
} possiblity of overlapping contexts.
If you don't care about multiple hits or merging overlapping contexts, you
can even mash this down to a single statement.
E.g.
torch% declare S=path # Searching in $path
torch% integer hit=0 C=2 # Context is 2 elements
torch% print -rl ${${(P)S}[$((
mathsubst> (hit = ${${(P)S}[(i)*local*]}) > C
mathsubst> ? hit < $#path
mathsubst> ? hit-C
mathsubst> : hit
mathsubst> : 1
mathsubst> )),$((
mathsubst> hit < $#path
mathsubst> ? hit+C
mathsubst> : hit
mathsubst> ))]}
/home/schaefer/bin
/usr/local/bin
/bin
/usr/bin
(Math parsing permits embedded newlines, subscript parsing does not, thus
the placement of "[$((" and ")),$((" and "))]".)
Note the ?: ternary tests would be different if using (I) to search from
right to left.
next prev parent reply other threads:[~2016-01-30 20:41 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-29 10:15 Sebastian Gniazdowski
2016-01-30 12:13 ` Sebastian Gniazdowski
2016-01-30 14:38 ` Christian Heinrich
2016-01-30 15:34 ` Sebastian Gniazdowski
2016-01-30 16:54 ` Bart Schaefer
2016-01-30 20:42 ` Bart Schaefer [this message]
[not found] ` <160130085456.ZM9730__49922.0612728552$1454172936$gmane$org@torch.brasslantern.com>
2016-02-07 0:22 ` min() max() math functions (was: Re: Feature request (@M):# with context matches) Daniel Shahaf
2016-02-07 1:00 ` Bart Schaefer
[not found] ` <160206170040.ZM1927__13399.3204137825$1454806909$gmane$org@torch.brasslantern.com>
2016-02-09 3:23 ` Daniel Shahaf
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