Re: [PATCH/RFC] blame: accept multiple -L ranges

On Tue, Jul 9, 2013 at 1:42 PM, Thomas Rast [off-list ref] wrote:

Junio C Hamano [off-list ref] writes:

quoted

 (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. 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.)

-- ES