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author | Junio C Hamano <gitster@pobox.com> | 2011-08-19 23:32:51 -0700 |
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committer | Junio C Hamano <gitster@pobox.com> | 2011-08-20 23:03:06 -0700 |
commit | 25e5e2bf85c8a2c2c8945935267539940c11020d (patch) | |
tree | e5b5899165adae30fe77b27c078f96ab31b67de4 | |
parent | 0906f6e14e6e9df0c4ea4edb08ebe9f5d16c2391 (diff) | |
download | git-25e5e2bf85c8a2c2c8945935267539940c11020d.tar.gz git-25e5e2bf85c8a2c2c8945935267539940c11020d.tar.xz |
combine-diff: support format_callback
This teaches combine-diff machinery to feed a combined merge to a callback
function when DIFF_FORMAT_CALLBACK is specified.
So far, format callback functions are not used for anything but 2-way
diffs. A callback is given a diff_queue_struct, which is an array of
diff_filepair. As its name suggests, a diff_filepair is a _pair_ of
diff_filespec that represents a single preimage and a single postimage.
Since "diff -c" is to compare N parents with a single merge result and
filter out any paths whose result match one (or more) of the parent(s),
its output has to be able to represent N preimages and 1 postimage. For
this reason, a callback function that inspects a diff_filepair that
results from this new infrastructure can and is expected to view the
preimage side (i.e. pair->one) as an array of diff_filespec. Each element
in the array, except for the last one, is marked with "has_more_entries"
bit, so that the same callback function can be used for 2-way diffs and
combined diffs.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r-- | combine-diff.c | 69 | ||||
-rw-r--r-- | diffcore.h | 2 |
2 files changed, 70 insertions, 1 deletions
diff --git a/combine-diff.c b/combine-diff.c index 655fa89d8..de8818651 100644 --- a/combine-diff.c +++ b/combine-diff.c @@ -970,6 +970,72 @@ void show_combined_diff(struct combine_diff_path *p, show_patch_diff(p, num_parent, dense, rev); } +static void free_combined_pair(struct diff_filepair *pair) +{ + free(pair->two); + free(pair); +} + +/* + * A combine_diff_path expresses N parents on the LHS against 1 merge + * result. Synthesize a diff_filepair that has N entries on the "one" + * side and 1 entry on the "two" side. + * + * In the future, we might want to add more data to combine_diff_path + * so that we can fill fields we are ignoring (most notably, size) here, + * but currently nobody uses it, so this should suffice for now. + */ +static struct diff_filepair *combined_pair(struct combine_diff_path *p, + int num_parent) +{ + int i; + struct diff_filepair *pair; + struct diff_filespec *pool; + + pair = xmalloc(sizeof(*pair)); + pool = xcalloc(num_parent + 1, sizeof(struct diff_filespec)); + pair->one = pool + 1; + pair->two = pool; + + for (i = 0; i < num_parent; i++) { + pair->one[i].path = p->path; + pair->one[i].mode = p->parent[i].mode; + hashcpy(pair->one[i].sha1, p->parent[i].sha1); + pair->one[i].sha1_valid = !is_null_sha1(p->parent[i].sha1); + pair->one[i].has_more_entries = 1; + } + pair->one[num_parent - 1].has_more_entries = 0; + + pair->two->path = p->path; + pair->two->mode = p->mode; + hashcpy(pair->two->sha1, p->sha1); + pair->two->sha1_valid = !is_null_sha1(p->sha1); + return pair; +} + +static void handle_combined_callback(struct diff_options *opt, + struct combine_diff_path *paths, + int num_parent, + int num_paths) +{ + struct combine_diff_path *p; + struct diff_queue_struct q; + int i; + + q.queue = xcalloc(num_paths, sizeof(struct diff_filepair *)); + q.alloc = num_paths; + q.nr = num_paths; + for (i = 0, p = paths; p; p = p->next) { + if (!p->len) + continue; + q.queue[i++] = combined_pair(p, num_parent); + } + opt->format_callback(&q, opt, opt->format_callback_data); + for (i = 0; i < num_paths; i++) + free_combined_pair(q.queue[i]); + free(q.queue); +} + void diff_tree_combined(const unsigned char *sha1, const unsigned char parent[][20], int num_parent, @@ -1029,6 +1095,9 @@ void diff_tree_combined(const unsigned char *sha1, else if (opt->output_format & (DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIFFSTAT)) needsep = 1; + else if (opt->output_format & DIFF_FORMAT_CALLBACK) + handle_combined_callback(opt, paths, num_parent, num_paths); + if (opt->output_format & DIFF_FORMAT_PATCH) { if (needsep) putchar(opt->line_termination); diff --git a/diffcore.h b/diffcore.h index b8f1fdecf..8f32b824c 100644 --- a/diffcore.h +++ b/diffcore.h @@ -45,7 +45,7 @@ struct diff_filespec { unsigned dirty_submodule : 2; /* For submodules: its work tree is dirty */ #define DIRTY_SUBMODULE_UNTRACKED 1 #define DIRTY_SUBMODULE_MODIFIED 2 - + unsigned has_more_entries : 1; /* only appear in combined diff */ struct userdiff_driver *driver; /* data should be considered "binary"; -1 means "don't know yet" */ int is_binary; |