Merge branch 'cd/bisect-messages-from-pre-flight-states' into next

"git bisect" was too silent before it is ready to start computing
the actual bisection, which has been corrected.

* cd/bisect-messages-from-pre-flight-states:
  bisect: output bisect setup status in bisect log
  bisect: output state before we are ready to compute bisection

bisect.h

@@ -62,6 +62,15 @@ enum bisect_error {
 	BISECT_INTERNAL_SUCCESS_MERGE_BASE = -11
 };
 
+/*
+ * Stores how many good/bad commits we have stored for a bisect. nr_bad can
+ * only be 0 or 1.
+ */
+struct bisect_state {
+	unsigned int nr_good;
+	unsigned int nr_bad;
+};
+
 enum bisect_error bisect_next_all(struct repository *r, const char *prefix);
 
 int estimate_bisect_steps(int all);

builtin/bisect--helper.c

@@ -329,12 +329,12 @@ static int check_and_set_terms(struct bisect_terms *terms, const char *cmd)
 	return 0;
 }
 
-static int mark_good(const char *refname, const struct object_id *oid,
-		     int flag, void *cb_data)
+static int inc_nr(const char *refname, const struct object_id *oid,
+		  int flag, void *cb_data)
 {
-	int *m_good = (int *)cb_data;
-	*m_good = 0;
-	return 1;
+	unsigned int *nr = (unsigned int *)cb_data;
+	(*nr)++;
+	return 0;
 }
 
 static const char need_bad_and_good_revision_warning[] =
@@ -384,23 +384,64 @@ static int decide_next(const struct bisect_terms *terms,
 			     vocab_good, vocab_bad, vocab_good, vocab_bad);
 }
 
-static int bisect_next_check(const struct bisect_terms *terms,
-			     const char *current_term)
+static void bisect_status(struct bisect_state *state,
+			  const struct bisect_terms *terms)
 {
-	int missing_good = 1, missing_bad = 1;
 	char *bad_ref = xstrfmt("refs/bisect/%s", terms->term_bad);
 	char *good_glob = xstrfmt("%s-*", terms->term_good);
 
 	if (ref_exists(bad_ref))
-		missing_bad = 0;
+		state->nr_bad = 1;
 
-	for_each_glob_ref_in(mark_good, good_glob, "refs/bisect/",
-			     (void *) &missing_good);
+	for_each_glob_ref_in(inc_nr, good_glob, "refs/bisect/",
+			     (void *) &state->nr_good);
 
 	free(good_glob);
 	free(bad_ref);
+}
 
-	return decide_next(terms, current_term, missing_good, missing_bad);
+__attribute__((format (printf, 1, 2)))
+static void bisect_log_printf(const char *fmt, ...)
+{
+	struct strbuf buf = STRBUF_INIT;
+	va_list ap;
+
+	va_start(ap, fmt);
+	strbuf_vaddf(&buf, fmt, ap);
+	va_end(ap);
+
+	printf("%s", buf.buf);
+	append_to_file(git_path_bisect_log(), "# %s", buf.buf);
+
+	strbuf_release(&buf);
+}
+
+static void bisect_print_status(const struct bisect_terms *terms)
+{
+	struct bisect_state state = { 0 };
+
+	bisect_status(&state, terms);
+
+	/* If we had both, we'd already be started, and shouldn't get here. */
+	if (state.nr_good && state.nr_bad)
+		return;
+
+	if (!state.nr_good && !state.nr_bad)
+		bisect_log_printf(_("status: waiting for both good and bad commits\n"));
+	else if (state.nr_good)
+		bisect_log_printf(Q_("status: waiting for bad commit, %d good commit known\n",
+				     "status: waiting for bad commit, %d good commits known\n",
+				     state.nr_good), state.nr_good);
+	else
+		bisect_log_printf(_("status: waiting for good commit(s), bad commit known\n"));
+}
+
+static int bisect_next_check(const struct bisect_terms *terms,
+			     const char *current_term)
+{
+	struct bisect_state state = { 0 };
+	bisect_status(&state, terms);
+	return decide_next(terms, current_term, !state.nr_good, !state.nr_bad);
 }
 
 static int get_terms(struct bisect_terms *terms)
@@ -606,8 +647,10 @@ static enum bisect_error bisect_next(struct bisect_terms *terms, const char *pre
 
 static enum bisect_error bisect_auto_next(struct bisect_terms *terms, const char *prefix)
 {
-	if (bisect_next_check(terms, NULL))
+	if (bisect_next_check(terms, NULL)) {
+		bisect_print_status(terms);
 		return BISECT_OK;
+	}
 
 	return bisect_next(terms, prefix);
 }

t/t6030-bisect-porcelain.sh

@@ -1025,4 +1025,32 @@ test_expect_success 'bisect visualize with a filename with dash and space' '
 	git bisect visualize -p -- "-hello 2"
 '
 
+test_expect_success 'bisect state output with multiple good commits' '
+	git bisect reset &&
+	git bisect start >output &&
+	grep "waiting for both good and bad commits" output &&
+	git bisect log >output &&
+	grep "waiting for both good and bad commits" output &&
+	git bisect good "$HASH1" >output &&
+	grep "waiting for bad commit, 1 good commit known" output &&
+	git bisect log >output &&
+	grep "waiting for bad commit, 1 good commit known" output &&
+	git bisect good "$HASH2" >output &&
+	grep "waiting for bad commit, 2 good commits known" output &&
+	git bisect log >output &&
+	grep "waiting for bad commit, 2 good commits known" output
+'
+
+test_expect_success 'bisect state output with bad commit' '
+	git bisect reset &&
+	git bisect start >output &&
+	grep "waiting for both good and bad commits" output &&
+	git bisect log >output &&
+	grep "waiting for both good and bad commits" output &&
+	git bisect bad "$HASH4" >output &&
+	grep -F "waiting for good commit(s), bad commit known" output &&
+	git bisect log >output &&
+	grep -F "waiting for good commit(s), bad commit known" output
+'
+
 test_done