On Wed, 8 Dec 2010, Nguyán ThÃi Ngác Duy wrote:
> Let's start off from where the previous discussion [1] stopped. People
> seem to agree ref^{/regex} is a good choice. But we have not come to
> conclusion how to specify the count yet. Possible suggestions are
>
> - ref^{/foo}2
> - ref^{2/foo}
> - ref^{:2/foo}
> - ref^{2nd/foo}
>
> For whatever syntax chosen, :/ should benefit too. I notice that :/!
> is reserved for future use. Perhaps :/!2/regex is not too cryptic?
I wonder if it would be possible to make :/<regex> (which looks a bit
like searching the index) to be an alias to --all^{/<regex>}...
Or if we can make ^{/<regex>} to act on revision range specified by
earlier commits, so for example foo..bar^{/<regex>} would work.
> I'd also like to do case-insensitive regex, by the way. :/!2i/regex
> looks a bit ugly.
The '2nd' idea came from Perl 6 regexp / grammars, see for example
https://github.com/perlpilot/perl6-docs/blob/master/intro/p6-regex-intro.pod
There are two other modifiers for matching a pattern some number of times
or only matching, say, the third time we see a pattern in a string. These
modifiers are a little strange in that their short-hand forms consist of
a number followed by some text:
modifier short-hand meaning
:x() :1x,:4x,:12x match some number of times
:nth() :1st,:2nd,:3rd,:4th match only the Nth occurance
Here are some examples to illustrate these modifiers:
$_ = "foo bar baz blat";
m :3x/ a / # matches the "a" characters in each word
m :nth(3)/ \w+ / # matches "baz"
So it could be e.g. 'foo^{:2nd/<regexp>}' (note that there is no trailing
/ closing regexp, i.e. it is not 'foo^{:2nd/<regexp>/}').
So if we chose this, why don't we follow Perl 6 rule of combining modifiers
http://perlcabal.org/syn/S05.html#Modifiers, so it would be
foo^{:2nd:i/<regexp>}
or
foo^{:i:nth(2)/<regexp>}
As to :/!<regexp> form: isn't it reserved for non-match? If not, then
perhaps
:/!2nd:i/<regexp>
> [1] http://mid.gmane.org/9D675671-693D-4B59-AF2A-0EFE4C537362@xxxxxx
>
> Nguyán ThÃi Ngác Duy (2):
> get_sha1_oneline: allow to input commit_list
> get_sha1: support ref^{/regex} syntax
>
> Documentation/revisions.txt | 7 ++++++
> sha1_name.c | 45 ++++++++++++++++++++++++++++++++----------
> 2 files changed, 41 insertions(+), 11 deletions(-)
Thank you for working on this.
--
Jakub Narebski
Poland
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