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diff: teach diff to display submodule difference with an inline diff

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Teach git-diff and friends a new format for displaying the difference
of a submodule. The new format is an inline diff of the contents of the
submodule between the commit range of the update. This allows the user
to see the actual code change caused by a submodule update.

Add tests for the new format and option.

Signed-off-by: Jacob Keller <jacob.keller@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jacob Keller
2016-08-31 16:27:25 -07:00
committed by Junio C Hamano
parent 8e6df65015
commit fd47ae6a5b
7 changed files with 863 additions and 21 deletions
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69
submodule.c
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@ -442,6 +442,75 @@ out:
clear_commit_marks(right, ~0);
}
void show_submodule_inline_diff(FILE *f, const char *path,
const char *line_prefix,
struct object_id *one, struct object_id *two,
unsigned dirty_submodule, const char *meta,
const char *del, const char *add, const char *reset,
const struct diff_options *o)
{
const struct object_id *old = &empty_tree_oid, *new = &empty_tree_oid;
struct commit *left = NULL, *right = NULL;
struct commit_list *merge_bases = NULL;
struct strbuf submodule_dir = STRBUF_INIT;
struct child_process cp = CHILD_PROCESS_INIT;
show_submodule_header(f, path, line_prefix, one, two, dirty_submodule,
meta, reset, &left, &right, &merge_bases);
/* We need a valid left and right commit to display a difference */
if (!(left || is_null_oid(one)) ||
!(right || is_null_oid(two)))
goto done;
if (left)
old = one;
if (right)
new = two;
fflush(f);
cp.git_cmd = 1;
cp.dir = path;
cp.out = dup(fileno(f));
cp.no_stdin = 1;
/* TODO: other options may need to be passed here. */
argv_array_push(&cp.args, "diff");
argv_array_pushf(&cp.args, "--line-prefix=%s", line_prefix);
if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
o->b_prefix, path);
argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
o->a_prefix, path);
} else {
argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
o->a_prefix, path);
argv_array_pushf(&cp.args, "--dst-prefix=%s%s/",
o->b_prefix, path);
}
argv_array_push(&cp.args, oid_to_hex(old));
/*
* If the submodule has modified content, we will diff against the
* work tree, under the assumption that the user has asked for the
* diff format and wishes to actually see all differences even if they
* haven't yet been committed to the submodule yet.
*/
if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED))
argv_array_push(&cp.args, oid_to_hex(new));
if (run_command(&cp))
fprintf(f, "(diff failed)\n");
done:
strbuf_release(&submodule_dir);
if (merge_bases)
free_commit_list(merge_bases);
if (left)
clear_commit_marks(left, ~0);
if (right)
clear_commit_marks(right, ~0);
}
void set_config_fetch_recurse_submodules(int value)
{
config_fetch_recurse_submodules = value;