[PATCH] disallow duplicate group names

---
 src/actions.c |    6 ++++++
 src/group.c   |   13 +++++++++++++
 src/group.h   |    1 +
 3 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/src/actions.c b/src/actions.c
index 292ffc4..80e5690 100644
--- a/src/actions.c
+++ b/src/actions.c
@@ -4845,6 +4845,8 @@ cmd_gother (int interactive, struct cmdarg **args)
 cmdret *
 cmd_gnew (int interactive, struct cmdarg **args)
 {
+  if (groups_get_group_by_name (ARG_STRING (0)))
+    return cmdret_new (RET_FAILURE, "gnew: group already exists");
   set_current_group (group_add_new_group (ARG_STRING(0)));
   return cmdret_new (RET_SUCCESS, NULL);
 }
@@ -4852,6 +4854,8 @@ cmd_gnew (int interactive, struct cmdarg **args)
 cmdret *
 cmd_gnewbg (int interactive, struct cmdarg **args)
 {
+  if (groups_get_group_by_name (ARG_STRING (0)))
+    return cmdret_new (RET_FAILURE, "gnewbg: group already exists");
   group_add_new_group (ARG_STRING(0));
   return cmdret_new (RET_SUCCESS, NULL);
 }
@@ -4859,6 +4863,8 @@ cmd_gnewbg (int interactive, struct cmdarg **args)
 cmdret *
 cmd_grename (int interactive, struct cmdarg **args)
 {
+  if (groups_get_group_by_name (ARG_STRING (0)))
+    return cmdret_new (RET_FAILURE, "grename: duplicate group name");
   group_rename (rp_current_group, ARG_STRING(0));
   return cmdret_new (RET_SUCCESS, NULL);
 }
diff --git a/src/group.c b/src/group.c
index 1c4329b..b79a0fc 100644
--- a/src/group.c
+++ b/src/group.c
@@ -156,6 +156,19 @@ groups_find_group_by_name (char *s)
 }
 
 rp_group *
+groups_get_group_by_name (char *s)
+{
+  rp_group *cur;
+
+  list_for_each_entry (cur, &rp_groups, node)
+    {
+      if (cur->name && !strcmp(s, cur->name))
+	return cur;
+    }
+  return NULL;
+}
+
+rp_group *
 groups_find_group_by_number (int n)
 {
   rp_group *cur;
diff --git a/src/group.h b/src/group.h
index 176e4ee..046aa58 100644
--- a/src/group.h
+++ b/src/group.h
@@ -42,6 +42,7 @@ void groups_unmap_window (rp_window *win);
 rp_window *group_prev_window (rp_group *g, rp_window *win);
 rp_window *group_next_window (rp_group *g, rp_window *win);
 rp_group *groups_find_group_by_name (char *s);
+rp_group *groups_get_group_by_name (char *s);
 rp_group *groups_find_group_by_number (int n);
 rp_group *groups_find_group_by_window (rp_window *win);
 rp_group *groups_find_group_by_group (rp_group *g);
-- 
1.6.0.2.307.gc427.dirty