From: Junio C Hamano <gitster@pobox.com>
Date: Tue, 09 Jul 2013 18:55:36 GMT
Subject: Re: [PATCH/RFC] blame: accept multiple -L ranges
Message-ID: <7vy59fv9zr.fsf@alter.siamese.dyndns.org>
In-Reply-To: <CAPig+cT9U7L-03Fe5YLft=WS2EZY1B_BhLzkM_sT_3wQQ1g1MQ@mail.gmail.com>

Eric Sunshine <sunshine@sunshineco.com> writes:

> On Tue, Jul 9, 2013 at 1:42 PM, Thomas Rast <trast@inf.ethz.ch> wrote:
>> Junio C Hamano <gitster@pobox.com> writes:
>>
>>>  (2) In the ranges "-L <anything>,/B/ -L /C/,<anything>", the
>>>      beginning of the second range is found by choosing C that comes
>>>      _after_ the end of the previous range (/B/ may choose either
>>>      the second or the 4th line, and the only C that comes after
>>>      either of them is the 5th line and that is where the second
>>>      range should begin, not at the beginning of the file).  The
>>>      same for "-L 1,3 -L /C/" (only C that comes after 3 is eligible
>>>      to be the beginning of the second range).
>>
>> So passing several -L arguments does not blame the union of what each
>> argument would blame individually?  Doesn't that make it rather harder
>> to explain?
>
> I don't think Junio meant to imply that. Collecting the blame ranges
> can/should be a distinct step from coalescing them. Junio is saying
> that an -L /re/ range search should start after the maximum line
> number already specified by any preceding range.

I am not sure if I want "maximum specified so far". I meant "start
searching at the last location", e.g.

	-L 100,200 -L 4,6 -L /A/,+20

would want to find the first A after line 6, not after line 200.

> Once all input ranges
> are collected, they can be coalesced. (If a -L /re/ range happens to
> be coalesced with or into some other range, that's fine: you're still
> seeing blame output for the requested lines.)

Yes.