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Re: [PATCH 05/19] diff.c: emit_line_0 can handle no color setting

On Mon, May 15, 2017 at 11:31 AM, Jonathan Tan <jonathantanmy@xxxxxxxxxx> wrote:
> On 05/13/2017 09:01 PM, Stefan Beller wrote:
>> In a later patch, I want to propose an option to detect&color
>> moved lines in a diff, which cannot be done in a one-pass over
>> the diff. Instead we need to go over the whole diff twice,
>> because we cannot detect the first line of the two corresponding
>> lines (+ and -) that got moved.
>> So to prepare the diff machinery for two pass algorithms
>> (i.e. buffer it all up and then operate on the result),
>> move all emissions to places, such that the only emitting
>> function is emit_line_0.
>> In later patches we may pass lines that are not colored to
>> the central function emit_line_0, so we
>> need to emit the color only when it is non-NULL.
> The diff below seems to just make emit_line_0 allow NULL for set and reset,
> unlike what the commit message above describes. (And is that necessary?
> Couldn't the caller just pass "" if they don't want any setting and/or
> resetting?)

They could just give ""; but instead of having an empty system
call I thought about this short cut.

I'll reword the commit message.