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Re: [PATCH 6/6] fsmonitor: Use fsmonitor data in `git diff`

On 1/5/2018 5:22 PM, Junio C Hamano wrote:
Johannes Schindelin <Johannes.Schindelin@xxxxxx> writes:

diff --git a/diff-lib.c b/diff-lib.c
index 8104603a3..13ff00d81 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -95,6 +95,9 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
diff_set_mnemonic_prefix(&revs->diffopt, "i/", "w/"); + if (!(option & DIFF_SKIP_FSMONITOR))
+		refresh_fsmonitor(&the_index);
  	if (diff_unmerged_stage < 0)
  		diff_unmerged_stage = 2;

I read over this hunk five times, and only now am I able to wrap my head
around this: if we do *not* want to skip the fsmonitor data, we refresh
the fsmonitor data in the index.

That feels a bit like an unneeded double negation. Speaking for myself, I
would prefore `DIFF_IGNORE_FSMONITOR` instead, it would feel less like a
double negation then. But I am not a native speaker, so I might be wrong.

I do find the logic a bit convoluted with double negative.

It's great to see more use of the fsmonitor data.  Thanks for doing this!

I agree with the sentiment that the logic as written is confusing. I'll also point out that DIFF_IGNORE_FSMONITOR would be more consistent with the similar CE_MATCH_IGNORE_FSMONITOR flag and logic.

I'm also confused why we would not want to use the fsmonitor data in the 'add' case. When would you ever need to add a file that had not been modified?