ack dev/users Google Group

Re: Add optional argument to -o

caio.chas...@gmail.com (Caio Chassot) — Tue, 05 Jan 2010 18:21:34 UT

Another option:
If you have no capture groups, -o outputs $&.
If you have one capture group -o outputs $1
If you have more than one capture group… I'm not sure.
The idea here is that you can pretty much always use non-capturing
groups. Tho it's a bit more typing for what is possibly a throw away
command.

Re: Add optional argument to -o

caio.chas...@gmail.com (Caio Chassot) — Tue, 05 Jan 2010 18:17:35 UT

When you want more, I say you fall back to good out --output.

Re: [ack-users] Add optional argument to -o

a...@petdance.com (Andy Lester) — Tue, 05 Jan 2010 15:15:23 UT

Let's see what others think. My concern is that then we're going to
want -o1,4 or something.

Add optional argument to -o

caio.chas...@gmail.com (Caio Chassot) — Tue, 05 Jan 2010 13:26:08 UT

Hi all,
-o is kinda equivalent to --output '$&'
So I'm thinking, what if we make -o take an optional argument to print
the capture number, so that -o N is equivalent --output '$N'?
Sounds good? Warrant a ticket / patch?

Any ack hackers going to Frozen Perl 2010?

a...@petdance.com (Andy Lester) — Sat, 02 Jan 2010 17:14:01 UT

I see there's a hackathon on Sunday of Frozen Perl 2010. Anyone going? A hackathon for design on ack 2.0 might just the thing.
xoxo,
Andy

Re: Where's grep -n?

caio.chas...@gmail.com (Caio Chassot) — Sat, 02 Jan 2010 11:45:51 UT

I'd add -N for --no-recurse while at it.

Re: Invert (negate) meaning of -G option

caio.chas...@gmail.com (Caio Chassot) — Sat, 02 Jan 2010 11:53:48 UT

Just some related issues that have bugged me recently:
1. I agree and add that both -G and -g could use a negative version.
I would suggest renaming one of them, and using the uppercase
version for negation.
So -g remains, and -G is -g negated. Then -G becomes another letter.
Say -x, with -X for negation.

Match only once per line

caio.chas...@gmail.com (Caio Chassot) — Sat, 02 Jan 2010 12:16:27 UT

What I want is something to match only once per line. Similar to -m
and -1, but for lines.
The general case would be match at most x times per line, and return
me only the nth match.
Do we have any option close to this? Sounds like something that would
be useful?
I currently deal with this need by doing something like this:

Re: Invert (negate) meaning of -G option

spreg...@yahoo.de (Gerhard Sprenger) — Sat, 02 Jan 2010 09:52:51 UT

Hello Andy, Christopher's solution of negative lookahead
(^(?!.*REGEX)) works well and so I have a good solution until
Ack 2.0 arrives.
Gerhard.

Re: Invert (negate) meaning of -G option

spreg...@yahoo.de (Gerhard Sprenger) — Sat, 02 Jan 2010 09:40:32 UT

On 31 Dez. 2009, 19:01, "Christopher J. Madsen" <p...@cjmweb.net>
wrote:
Hello Chris, thanks a lot. Your solution is *exactly* what I was
looking for (utilize a feature
of Perl regexes not obvious to me). Negative lookahead seems to ba a
perfect solution
to match a pattern that doesn't include another pattern. Lookarounds

Re: [ack-users] Invert (negate) meaning of -G option

p...@cjmweb.net (Christopher J. Madsen) — Thu, 31 Dec 2009 18:01:04 UT

^(?!.*REGEX) ought to do it, although that's more typing than just "!".
(That does assume your filenames don't contain newlines, which is
usually a fairly safe assumption.)

Re: [ack-users] Invert (negate) meaning of -G option

a...@petdance.com (Andy Lester) — Thu, 31 Dec 2009 17:51:33 UT

Not in ack 1.x. Ack 2.0 will have overhauled file selection tools.

Invert (negate) meaning of -G option

spreg...@yahoo.de (Gerhard Sprenger) — Thu, 31 Dec 2009 16:37:24 UT

Hello, great tool. Thank You Andy.
I want to negate the -G option (only search files that match REGEX) to
search only files that DON'T match REGEX. Some REGEX are easy to
negate ("\d\d\d" -> "\D\D\D") but how to specify much more complicated
search criterions? To specify files that don't end in .bat and not

Re: [ack-users] Where's grep -n?

o...@avtalion.name (Ori Avtalion) — Sat, 26 Dec 2009 12:08:46 UT

Ok, I'll bite.
How should "show line numbers" behave?
The -H option, which shows filenames, automatically adds line numbers.
Should there be an option to suppress line numbers, if someone wants
filenames but no line numbers?

Re: [ack-users] ack-grep suggestion in FAQ

a...@petdance.com (Andy Lester) — Fri, 25 Dec 2009 04:48:49 UT

Oh, right, good point. Thanks.
xoxo,
Andy