log: add --show-linear-break to help see non-linear history
Option explanation is in rev-list-options.txt. The interaction with -z
is left undecided.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/rev-list-options.txt b/Documentation/rev-list-options.txt
index 03533af..1261ac0 100644
--- a/Documentation/rev-list-options.txt
+++ b/Documentation/rev-list-options.txt
@@ -750,6 +750,13 @@
This implies the `--topo-order` option by default, but the
`--date-order` option may also be specified.
+--show-linear-break[=<barrier>]::
+ When --graph is not used, all history branches are flattened
+ which can make it hard to see that the two consecutive commits
+ do not belong to a linear branch. This option puts a barrier
+ in between them in that case. If `<barrier>` is specified, it
+ is the string that will be shown instead of the default one.
+
ifdef::git-rev-list[]
--count::
Print a number stating how many commits would have been
diff --git a/log-tree.c b/log-tree.c
index 08970bf..17862f6 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -805,12 +805,16 @@
if (opt->line_level_traverse)
return line_log_print(opt, commit);
+ if (opt->track_linear && !opt->linear && !opt->reverse_output_stage)
+ printf("\n%s\n", opt->break_bar);
shown = log_tree_diff(opt, commit, &log);
if (!shown && opt->loginfo && opt->always_show_header) {
log.parent = NULL;
show_log(opt);
shown = 1;
}
+ if (opt->track_linear && !opt->linear && opt->reverse_output_stage)
+ printf("\n%s\n", opt->break_bar);
opt->loginfo = NULL;
maybe_flush_or_die(stdout, "stdout");
return shown;
diff --git a/object.h b/object.h
index 5e30066..ce01142 100644
--- a/object.h
+++ b/object.h
@@ -28,7 +28,7 @@
#define TYPE_BITS 3
/*
* object flag allocation:
- * revision.h: 0---------10
+ * revision.h: 0---------10 26
* fetch-pack.c: 0---4
* walker.c: 0-2
* upload-pack.c: 11----------------19
diff --git a/revision.c b/revision.c
index a68fde6..05b76c7 100644
--- a/revision.c
+++ b/revision.c
@@ -1832,6 +1832,14 @@
revs->notes_opt.use_default_notes = 1;
} else if (!strcmp(arg, "--show-signature")) {
revs->show_signature = 1;
+ } else if (!strcmp(arg, "--show-linear-break") ||
+ starts_with(arg, "--show-linear-break=")) {
+ if (starts_with(arg, "--show-linear-break="))
+ revs->break_bar = xstrdup(arg + 20);
+ else
+ revs->break_bar = " ..........";
+ revs->track_linear = 1;
+ revs->track_first_time = 1;
} else if (starts_with(arg, "--show-notes=") ||
starts_with(arg, "--notes=")) {
struct strbuf buf = STRBUF_INIT;
@@ -1955,6 +1963,8 @@
unkv[(*unkc)++] = arg;
return opts;
}
+ if (revs->graph && revs->track_linear)
+ die("--show-linear-break and --graph are incompatible");
return 1;
}
@@ -2897,6 +2907,27 @@
return action;
}
+static void track_linear(struct rev_info *revs, struct commit *commit)
+{
+ if (revs->track_first_time) {
+ revs->linear = 1;
+ revs->track_first_time = 0;
+ } else {
+ struct commit_list *p;
+ for (p = revs->previous_parents; p; p = p->next)
+ if (p->item == NULL || /* first commit */
+ !hashcmp(p->item->object.sha1, commit->object.sha1))
+ break;
+ revs->linear = p != NULL;
+ }
+ if (revs->reverse) {
+ if (revs->linear)
+ commit->object.flags |= TRACK_LINEAR;
+ }
+ free_commit_list(revs->previous_parents);
+ revs->previous_parents = copy_commit_list(commit->parents);
+}
+
static struct commit *get_revision_1(struct rev_info *revs)
{
if (!revs->commits)
@@ -2936,6 +2967,8 @@
die("Failed to simplify parents of commit %s",
sha1_to_hex(commit->object.sha1));
default:
+ if (revs->track_linear)
+ track_linear(revs, commit);
return commit;
}
} while (revs->commits);
@@ -3102,14 +3135,23 @@
revs->reverse_output_stage = 1;
}
- if (revs->reverse_output_stage)
- return pop_commit(&revs->commits);
+ if (revs->reverse_output_stage) {
+ c = pop_commit(&revs->commits);
+ if (revs->track_linear)
+ revs->linear = !!(c && c->object.flags & TRACK_LINEAR);
+ return c;
+ }
c = get_revision_internal(revs);
if (c && revs->graph)
graph_update(revs->graph, c);
- if (!c)
+ if (!c) {
free_saved_parents(revs);
+ if (revs->previous_parents) {
+ free_commit_list(revs->previous_parents);
+ revs->previous_parents = NULL;
+ }
+ }
return c;
}
diff --git a/revision.h b/revision.h
index 531fb0d..b8f4bc9 100644
--- a/revision.h
+++ b/revision.h
@@ -19,7 +19,8 @@
#define SYMMETRIC_LEFT (1u<<8)
#define PATCHSAME (1u<<9)
#define BOTTOM (1u<<10)
-#define ALL_REV_FLAGS ((1u<<11)-1)
+#define TRACK_LINEAR (1u<<26)
+#define ALL_REV_FLAGS (((1u<<11)-1) | TRACK_LINEAR)
#define DECORATE_SHORT_REFS 1
#define DECORATE_FULL_REFS 2
@@ -138,6 +139,10 @@
preserve_subject:1;
unsigned int disable_stdin:1;
unsigned int leak_pending:1;
+ /* --show-linear-break */
+ unsigned int track_linear:1,
+ track_first_time:1,
+ linear:1;
enum date_mode date_mode;
@@ -196,6 +201,9 @@
/* copies of the parent lists, for --full-diff display */
struct saved_parents *saved_parents_slab;
+
+ struct commit_list *previous_parents;
+ const char *break_bar;
};
extern int ref_excluded(struct string_list *, const char *path);
