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diff: futureproof "stop feeding the backend early" logic

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Refactor the "do not stop feeding the backend early" logic into a small
helper function and use it in both run_diff_files() and diff_tree() that
has the stop-early optimization. We may later add other types of diffcore
transformation that require to look at the whole result like diff-filter
does, and having the logic in a single place is essential for longer term
maintainability.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2011-05-31 09:14:17 -07:00
parent af7b41c923
commit 28b9264dd6
4 changed files with 11 additions and 6 deletions
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4
diff-lib.c
View File

@ -73,9 +73,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
struct cache_entry *ce = active_cache[i];
int changed;
if (DIFF_OPT_TST(&revs->diffopt, QUICK) &&
!revs->diffopt.filter &&
DIFF_OPT_TST(&revs->diffopt, HAS_CHANGES))
if (diff_can_quit_early(&revs->diffopt))
break;
if (!ce_path_match(ce, revs->prune_data))

7
diff.c
View File

@ -3513,6 +3513,13 @@ int diff_result_code(struct diff_options *opt, int status)
return result;
}
int diff_can_quit_early(struct diff_options *opt)
{
return (DIFF_OPT_TST(opt, QUICK) &&
!opt->filter &&
DIFF_OPT_TST(opt, HAS_CHANGES));
}
void diff_addremove(struct diff_options *options,
int addremove, unsigned mode,
const unsigned char *sha1,

2
diff.h
View File

@ -170,6 +170,8 @@ extern void diff_tree_combined_merge(const unsigned char *sha1, int, struct rev_
void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b);
extern int diff_can_quit_early(struct diff_options *);
extern void diff_addremove(struct diff_options *,
int addremove,
unsigned mode,

4
tree-diff.c
View File

@ -286,9 +286,7 @@ int diff_tree(struct tree_desc *t1, struct tree_desc *t2, const char *base, stru
int baselen = strlen(base);
for (;;) {
if (DIFF_OPT_TST(opt, QUICK) &&
!opt->filter &&
DIFF_OPT_TST(opt, HAS_CHANGES))
if (diff_can_quit_early(opt))
break;
if (opt->nr_paths) {
skip_uninteresting(t1, base, baselen, opt);