Simon Ruderich <si...@ruderich.org> writes:
> get_textconv() is called in diff_grep() to determine the textconv driver
> before calling fill_one() and then again in fill_one(). Remove this
> unnecessary call by determining the textconv driver before calling
If I am reading the code correctly, it is has_changes(), which is
used for "log -S" (not "log -G" that uses diff_grep()), that does
the unnecessary get_textconv() unconditionally. The way diff_grep()
divides the work to make fill_one() responsible for filling the
textconv as necessary is internally consistent, and there is no
The fill_one() function is responsible for finding and
filling the textconv filter as necessary, and is called by
diff_grep() function that implements "git log -G<pattern>".
The has_changes() function calls get_textconv() for two
sides being compared, before it checks to see if it was
asked to perform the pickaxe limiting with the -S option.
Move the code around to avoid this wastage. After that,
fill_one() is called to use the textconv.
By adding get_textconv() to diff_grep() and relieving
fill_one() of responsibility to find the textconv filter, we
can avoid calling get_textconv() twice.
Explained that way, it makes me wonder why we cannot fix it the
other way around, that is, not fetching textconv in has_changes()
and instead letting fill_one() to find textconv as needed.
The answer is because has_changes() itself looks at the textconv.
But we have to wonder why it is so. diff_grep() short-circuits when
the two sides are identical and has_changes() has a similar but
different logic to check if the identical two sides are processed
with the same textconv filter before saying this filepair is
Shouldn't that logic be unified as well?
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