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run_diff_files(): clarify computation of sha1 validity

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Remove the need to have duplicated "if there is a change then feed
null_sha1 and otherwise sha1 from the cache entry" for the "new"
side of the diff by introducing two temporary variables to point
at the object name of the old and the new side of the blobs.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2014-12-11 13:11:06 -08:00
parent fdf96a20ac
commit 0b86fe8923
1 changed files with 6 additions and 2 deletions
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8
diff-lib.c
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@ -101,6 +101,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
struct cache_entry *ce = active_cache[i];
int changed;
unsigned dirty_submodule = 0;
const unsigned char *old_sha1, *new_sha1;
if (diff_can_quit_early(&revs->diffopt))
break;
@ -224,9 +225,12 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
continue;
}
oldmode = ce->ce_mode;
old_sha1 = ce->sha1;
new_sha1 = changed ? null_sha1 : ce->sha1;
diff_change(&revs->diffopt, oldmode, newmode,
ce->sha1, (changed ? null_sha1 : ce->sha1),
!is_null_sha1(ce->sha1), (changed ? 0 : !is_null_sha1(ce->sha1)),
old_sha1, new_sha1,
!is_null_sha1(old_sha1),
!is_null_sha1(new_sha1),
ce->name, 0, dirty_submodule);
}