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Merge branch 'dl/diff-merge-base'

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"git diff A...B" learned "git diff --merge-base A B", which is a
longer short-hand to say the same thing.

* dl/diff-merge-base:
  contrib/completion: complete `git diff --merge-base`
  builtin/diff-tree: learn --merge-base
  builtin/diff-index: learn --merge-base
  t4068: add --merge-base tests
  diff-lib: define diff_get_merge_base()
  diff-lib: accept option flags in run_diff_index()
  contrib/completion: extract common diff/difftool options
  git-diff.txt: backtick quote command text
  git-diff-index.txt: make --cached description a proper sentence
  t4068: remove unnecessary >tmp
This commit is contained in:
Junio C Hamano
2020-11-02 13:17:39 -08:00
parent 761a4e9ab1 cce7d6ecfc
commit b6fb70c985
11 changed files with 356 additions and 141 deletions
Download Patch File Download Diff File Expand all files Collapse all files

49
builtin/diff.c
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@ -26,7 +26,7 @@
static const char builtin_diff_usage[] =
"git diff [<options>] [<commit>] [--] [<path>...]\n"
" or: git diff [<options>] --cached [<commit>] [--] [<path>...]\n"
" or: git diff [<options>] <commit> [<commit>...] <commit> [--] [<path>...]\n"
" or: git diff [<options>] <commit> [--merge-base] [<commit>...] <commit> [--] [<path>...]\n"
" or: git diff [<options>] <commit>...<commit>] [--] [<path>...]\n"
" or: git diff [<options>] <blob> <blob>]\n"
" or: git diff [<options>] --no-index [--] <path> <path>]\n"
@ -134,11 +134,13 @@ static int builtin_diff_blobs(struct rev_info *revs,
static int builtin_diff_index(struct rev_info *revs,
int argc, const char **argv)
{
int cached = 0;
unsigned int option = 0;
while (1 < argc) {
const char *arg = argv[1];
if (!strcmp(arg, "--cached") || !strcmp(arg, "--staged"))
cached = 1;
option |= DIFF_INDEX_CACHED;
else if (!strcmp(arg, "--merge-base"))
option |= DIFF_INDEX_MERGE_BASE;
else
usage(builtin_diff_usage);
argv++; argc--;
@ -151,7 +153,7 @@ static int builtin_diff_index(struct rev_info *revs,
revs->max_count != -1 || revs->min_age != -1 ||
revs->max_age != -1)
usage(builtin_diff_usage);
if (!cached) {
if (!(option & DIFF_INDEX_CACHED)) {
setup_work_tree();
if (read_cache_preload(&revs->diffopt.pathspec) < 0) {
perror("read_cache_preload");
@ -161,7 +163,7 @@ static int builtin_diff_index(struct rev_info *revs,
perror("read_cache");
return -1;
}
return run_diff_index(revs, cached);
return run_diff_index(revs, option);
}
static int builtin_diff_tree(struct rev_info *revs,
@ -170,19 +172,34 @@ static int builtin_diff_tree(struct rev_info *revs,
struct object_array_entry *ent1)
{
const struct object_id *(oid[2]);
int swap = 0;
struct object_id mb_oid;
int merge_base = 0;
if (argc > 1)
usage(builtin_diff_usage);
while (1 < argc) {
const char *arg = argv[1];
if (!strcmp(arg, "--merge-base"))
merge_base = 1;
else
usage(builtin_diff_usage);
argv++; argc--;
}
/*
* We saw two trees, ent0 and ent1. If ent1 is uninteresting,
* swap them.
*/
if (ent1->item->flags & UNINTERESTING)
swap = 1;
oid[swap] = &ent0->item->oid;
oid[1 - swap] = &ent1->item->oid;
if (merge_base) {
diff_get_merge_base(revs, &mb_oid);
oid[0] = &mb_oid;
oid[1] = &revs->pending.objects[1].item->oid;
} else {
int swap = 0;
/*
* We saw two trees, ent0 and ent1. If ent1 is uninteresting,
* swap them.
*/
if (ent1->item->flags & UNINTERESTING)
swap = 1;
oid[swap] = &ent0->item->oid;
oid[1 - swap] = &ent1->item->oid;
}
diff_tree_oid(oid[0], oid[1], "", &revs->diffopt);
log_tree_diff_flush(revs);
return 0;