[PATCH] disallow duplicate group names

---
 src/actions.c |    8 +++++++-
 src/group.c   |    5 +++--
 src/group.h   |    2 +-
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/actions.c b/src/actions.c
index 292ffc4..c977075 100644
--- a/src/actions.c
+++ b/src/actions.c
@@ -1916,7 +1916,7 @@ find_group (char *str)
         return group;
     }
 
-  group = groups_find_group_by_name (str);
+  group = groups_find_group_by_name (str, 0);
   return group;
 }
 
@@ -4845,6 +4845,8 @@ cmd_gother (int interactive, struct cmdarg **args)
 cmdret *
 cmd_gnew (int interactive, struct cmdarg **args)
 {
+  if (groups_find_group_by_name (ARG_STRING (0), 1))
+    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_find_group_by_name (ARG_STRING (0), 1))
+    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_find_group_by_name (ARG_STRING (0), 1))
+    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..5246b33 100644
--- a/src/group.c
+++ b/src/group.c
@@ -139,7 +139,7 @@ group_last_group (void)
 }
 
 rp_group *
-groups_find_group_by_name (char *s)
+groups_find_group_by_name (char *s, int exact_match)
 {
   rp_group *cur;
 
@@ -147,7 +147,8 @@ groups_find_group_by_name (char *s)
     {
       if (cur->name)
         {
-          if (str_comp (s, cur->name, strlen (s)))
+          if ((!exact_match && str_comp (s, cur->name, strlen (s))) ||
+              (exact_match && !strcmp (cur->name, s)))
             return cur;
         }
     }
diff --git a/src/group.h b/src/group.h
index 176e4ee..364100f 100644
--- a/src/group.h
+++ b/src/group.h
@@ -41,7 +41,7 @@ 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_find_group_by_name (char *s, int exact_match);
 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