status: don't suggest "git rm" or "git add" if not appropriate

The display of the advice '(use git add/rm [...])' (when there are
unmerged files) after running 'git status' is now depending of the
mark, whether it's 'both deleted', 'deleted by us/them' or others. For
instance, when there is just one file that's marked as 'both deleted',
'git status' shows '(use git rm [...])' and if there are two files,
one as 'both deleted' and the other as 'added by them', the advice is
'(use git add/rm [...])'.

The previous tests in t7512-status-help.sh are updated.

Test about the case of only 'both deleted' is added in
t7060-wtstatus.sh

Signed-off-by: Lucien Kong <Lucien.Kong@ensimag.imag.fr>
Signed-off-by: Valentin Duperray <Valentin.Duperray@ensimag.imag.fr>
Signed-off-by: Franck Jonas <Franck.Jonas@ensimag.imag.fr>
Signed-off-by: Thomas Nguy <Thomas.Nguy@ensimag.imag.fr>
Signed-off-by: Huynh Khoi Nguyen Nguyen <Huynh-Khoi-Nguyen.Nguyen@ensimag.imag.fr>
Signed-off-by: Matthieu Moy <Matthieu.Moy@grenoble-inp.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7060-wtstatus.sh

@@ -152,7 +152,7 @@ test_expect_success 'status when conflicts with add and rm advice (deleted by th
 '
 
 
-test_expect_success 'status when conflicts with add and rm advice (both deleted)' '
+test_expect_success 'prepare for conflicts' '
 	git reset --hard &&
 	git checkout -b conflict &&
 	test_commit one main.txt one &&
@@ -161,7 +161,11 @@ test_expect_success 'status when conflicts with add and rm advice (both deleted)
 	git commit -m "main.txt renamed in sub_master.txt" &&
 	git checkout conflict_second &&
 	git mv main.txt sub_second.txt &&
-	git commit -m "main.txt renamed in sub_second.txt" &&
+	git commit -m "main.txt renamed in sub_second.txt"
+'
+
+
+test_expect_success 'status when conflicts with add and rm advice (both deleted)' '
 	test_must_fail git merge conflict &&
 	cat >expected <<-\EOF &&
 	# On branch conflict_second
@@ -182,4 +186,32 @@ test_expect_success 'status when conflicts with add and rm advice (both deleted)
 '
 
 
+test_expect_success 'status when conflicts with only rm advice (both deleted)' '
+	git reset --hard conflict_second &&
+	test_must_fail git merge conflict &&
+	git add sub_master.txt &&
+	git add sub_second.txt &&
+	cat >expected <<-\EOF &&
+	# On branch conflict_second
+	# You have unmerged paths.
+	#   (fix conflicts and run "git commit")
+	#
+	# Changes to be committed:
+	#
+	#	new file:   sub_master.txt
+	#
+	# Unmerged paths:
+	#   (use "git rm <file>..." to mark resolution)
+	#
+	#	both deleted:       main.txt
+	#
+	# Untracked files not listed (use -u option to show untracked files)
+	EOF
+	git status --untracked-files=no >actual &&
+	test_i18ncmp expected actual &&
+	git reset --hard &&
+	git checkout master
+'
+
+
 test_done

t/t7512-status-help.sh

@@ -30,7 +30,7 @@ test_expect_success 'status when conflicts unresolved' '
 	#   (fix conflicts and run "git commit")
 	#
 	# Unmerged paths:
-	#   (use "git add/rm <file>..." as appropriate to mark resolution)
+	#   (use "git add <file>..." to mark resolution)
 	#
 	#	both modified:      main.txt
 	#
@@ -83,7 +83,7 @@ test_expect_success 'status when rebase in progress before resolving conflicts'
 	#
 	# Unmerged paths:
 	#   (use "git reset HEAD <file>..." to unstage)
-	#   (use "git add/rm <file>..." as appropriate to mark resolution)
+	#   (use "git add <file>..." to mark resolution)
 	#
 	#	both modified:      main.txt
 	#
@@ -140,7 +140,7 @@ test_expect_success 'status during rebase -i when conflicts unresolved' '
 	#
 	# Unmerged paths:
 	#   (use "git reset HEAD <file>..." to unstage)
-	#   (use "git add/rm <file>..." as appropriate to mark resolution)
+	#   (use "git add <file>..." to mark resolution)
 	#
 	#	both modified:      main.txt
 	#
@@ -336,7 +336,7 @@ test_expect_success 'status when cherry-picking before resolving conflicts' '
 	#   (fix conflicts and run "git commit")
 	#
 	# Unmerged paths:
-	#   (use "git add/rm <file>..." as appropriate to mark resolution)
+	#   (use "git add <file>..." to mark resolution)
 	#
 	#	both modified:      main.txt
 	#

wt-status.c

@@ -131,9 +131,34 @@ void wt_status_prepare(struct wt_status *s)
 
 static void wt_status_print_unmerged_header(struct wt_status *s)
 {
+	int i;
+	int del_mod_conflict = 0;
+	int both_deleted = 0;
+	int not_deleted = 0;
 	const char *c = color(WT_STATUS_HEADER, s);
 
 	status_printf_ln(s, c, _("Unmerged paths:"));
+
+	for (i = 0; i < s->change.nr; i++) {
+		struct string_list_item *it = &(s->change.items[i]);
+		struct wt_status_change_data *d = it->util;
+
+		switch (d->stagemask) {
+		case 0:
+			break;
+		case 1:
+			both_deleted = 1;
+			break;
+		case 3:
+		case 5:
+			del_mod_conflict = 1;
+			break;
+		default:
+			not_deleted = 1;
+			break;
+		}
+	}
+
 	if (!advice_status_hints)
 		return;
 	if (s->whence != FROM_COMMIT)
@@ -142,7 +167,17 @@ static void wt_status_print_unmerged_header(struct wt_status *s)
 		status_printf_ln(s, c, _("  (use \"git reset %s <file>...\" to unstage)"), s->reference);
 	else
 		status_printf_ln(s, c, _("  (use \"git rm --cached <file>...\" to unstage)"));
-	status_printf_ln(s, c, _("  (use \"git add/rm <file>...\" as appropriate to mark resolution)"));
+
+	if (!both_deleted) {
+		if (!del_mod_conflict)
+			status_printf_ln(s, c, _("  (use \"git add <file>...\" to mark resolution)"));
+		else
+			status_printf_ln(s, c, _("  (use \"git add/rm <file>...\" as appropriate to mark resolution)"));
+	} else if (!del_mod_conflict && !not_deleted) {
+		status_printf_ln(s, c, _("  (use \"git rm <file>...\" to mark resolution)"));
+	} else {
+		status_printf_ln(s, c, _("  (use \"git add/rm <file>...\" as appropriate to mark resolution)"));
+	}
 	status_printf_ln(s, c, "");
 }