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stat_tracking_info: return +1 when branches not equal 

Extend stat_tracking_info() to return +1 when branches are not equal and to
take a new "enum ahead_behind_flags" argument to allow skipping the (possibly
expensive) ahead/behind computation.

This will be used in the next commit to allow "git status" to avoid full
ahead/behind calculations for performance reasons.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff Hostetler 2018-01-09 18:50:15 +00:00 committed by Junio C Hamano
parent 1eaabe34fc
commit d7d1b496ae
4 changed files with 36 additions and 20 deletions
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8
ref-filter.c
View File

@ -1249,8 +1249,8 @@ static void fill_remote_ref_details(struct used_atom *atom, const char *refname,
if (atom->u.remote_ref.option == RR_REF)
*s = show_ref(&atom->u.remote_ref.refname, refname);
else if (atom->u.remote_ref.option == RR_TRACK) {
if (stat_tracking_info(branch, &num_ours,
&num_theirs, NULL)) {
if (stat_tracking_info(branch, &num_ours, &num_theirs,
NULL, AHEAD_BEHIND_FULL) < 0) {
*s = xstrdup(msgs.gone);
} else if (!num_ours && !num_theirs)
*s = "";
@ -1267,8 +1267,8 @@ static void fill_remote_ref_details(struct used_atom *atom, const char *refname,
free((void *)to_free);
}
} else if (atom->u.remote_ref.option == RR_TRACKSHORT) {
if (stat_tracking_info(branch, &num_ours,
&num_theirs, NULL))
if (stat_tracking_info(branch, &num_ours, &num_theirs,
NULL, AHEAD_BEHIND_FULL) < 0)
return;
if (!num_ours && !num_theirs)

34
remote.c
View File

@ -2007,16 +2007,23 @@ int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
}
/*
* Compare a branch with its upstream, and save their differences (number
* of commits) in *num_ours and *num_theirs. The name of the upstream branch
* (or NULL if no upstream is defined) is returned via *upstream_name, if it
* is not itself NULL.
* Lookup the upstream branch for the given branch and if present, optionally
* compute the commit ahead/behind values for the pair.
*
* If abf is AHEAD_BEHIND_FULL, compute the full ahead/behind and return the
* counts in *num_ours and *num_theirs. If abf is AHEAD_BEHIND_QUICK, skip
* the (potentially expensive) a/b computation (*num_ours and *num_theirs are
* set to zero).
*
* The name of the upstream branch (or NULL if no upstream is defined) is
* returned via *upstream_name, if it is not itself NULL.
*
* Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
* upstream defined, or ref does not exist), 0 otherwise.
* upstream defined, or ref does not exist). Returns 0 if the commits are
* identical. Returns 1 if commits are different.
*/
int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
const char **upstream_name)
const char **upstream_name, enum ahead_behind_flags abf)
{
struct object_id oid;
struct commit *ours, *theirs;
@ -2044,11 +2051,13 @@ int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
if (!ours)
return -1;
*num_theirs = *num_ours = 0;
/* are we the same? */
if (theirs == ours) {
*num_theirs = *num_ours = 0;
if (theirs == ours)
return 0;
}
if (abf == AHEAD_BEHIND_QUICK)
return 1;
/* Run "rev-list --left-right ours...theirs" internally... */
argv_array_push(&argv, ""); /* ignored */
@ -2064,8 +2073,6 @@ int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
die("revision walk setup failed");
/* ... and count the commits on each side. */
*num_ours = 0;
*num_theirs = 0;
while (1) {
struct commit *c = get_revision(&revs);
if (!c)
@ -2081,7 +2088,7 @@ int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
clear_commit_marks(theirs, ALL_REV_FLAGS);
argv_array_clear(&argv);
return 0;
return 1;
}
/*
@ -2094,7 +2101,8 @@ int format_tracking_info(struct branch *branch, struct strbuf *sb)
char *base;
int upstream_is_gone = 0;
if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
if (stat_tracking_info(branch, &ours, &theirs, &full_base,
AHEAD_BEHIND_FULL) < 0) {
if (!full_base)
return 0;
upstream_is_gone = 1;

8
remote.h
View File

@ -257,9 +257,15 @@ enum match_refs_flags {
MATCH_REFS_FOLLOW_TAGS = (1 << 3)
};
/* Flags for --ahead-behind option. */
enum ahead_behind_flags {
AHEAD_BEHIND_QUICK = 0, /* just eq/neq reporting */
AHEAD_BEHIND_FULL = 1, /* traditional a/b reporting */
};
/* Reporting of tracking info */
int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
const char **upstream_name);
const char **upstream_name, enum ahead_behind_flags abf);
int format_tracking_info(struct branch *branch, struct strbuf *sb);
struct ref *get_local_heads(void);

6
wt-status.c
View File

@ -1796,7 +1796,8 @@ static void wt_shortstatus_print_tracking(struct wt_status *s)
color_fprintf(s->fp, branch_color_local, "%s", branch_name);
if (stat_tracking_info(branch, &num_ours, &num_theirs, &base) < 0) {
if (stat_tracking_info(branch, &num_ours, &num_theirs, &base,
AHEAD_BEHIND_FULL) < 0) {
if (!base)
goto conclude;
@ -1933,7 +1934,8 @@ static void wt_porcelain_v2_print_tracking(struct wt_status *s)
/* Lookup stats on the upstream tracking branch, if set. */
branch = branch_get(branch_name);
base = NULL;
ab_info = (stat_tracking_info(branch, &nr_ahead, &nr_behind, &base) == 0);
ab_info = (stat_tracking_info(branch, &nr_ahead, &nr_behind,
&base, AHEAD_BEHIND_FULL) >= 0);
if (base) {
base = shorten_unambiguous_ref(base, 0);
fprintf(s->fp, "# branch.upstream %s%c", base, eol);