lua: expose add_list change items as table values

[project/uci.git] / lua / uci.c

diff --git a/lua/uci.c b/lua/uci.c
index aaa5828..ac04c11 100644 (file)
--- a/lua/uci.c
+++ b/lua/uci.c
@@ -691,6 +691,7 @@ uci_lua_add_change(lua_State *L, struct uci_element *e)
 {
        struct uci_delta *h;
        const char *name;
+       const char *value;
 
        h = uci_to_delta(e);
        if (!h->section)
@@ -704,12 +705,40 @@ uci_lua_add_change(lua_State *L, struct uci_element *e)
                lua_setfield(L, -3, h->section);
        }
 
-       name = (h->e.name ? h->e.name : ".type");
-       if (h->value)
-               lua_pushstring(L, h->value);
-       else
-               lua_pushstring(L, "");
-       lua_setfield(L, -2, name);
+       name = h->e.name;
+       value = h->value ? h->value : "";
+
+       if (name) {
+               lua_getfield(L, -1, name);
+
+               /* there seems to be no value yet so simply push it as string */
+               if (lua_isnil(L, -1)) {
+                       lua_pushstring(L, value);
+                       lua_setfield(L, -3, name);
+
+               /* there is already a value, so this change is a list_add,
+                * coerce string into one-element array and append new value */
+               } else if (lua_isstring(L, -1)) {
+                       lua_newtable(L);
+                       lua_pushvalue(L, -2);
+                       lua_rawseti(L, -2, 1);
+                       lua_pushstring(L, value);
+                       lua_rawseti(L, -2, 2);
+                       lua_setfield(L, -3, name);
+
+               /* a table is on the top of the stack so this is a subsequent,
+                * list_add, append this value to table */
+               } else if (lua_istable(L, -1)) {
+                       lua_pushstring(L, value);
+                       lua_rawseti(L, -2, lua_objlen(L, -2) + 1);
+               }
+
+               lua_pop(L, 1);
+       } else {
+               lua_pushstring(L, value);
+               lua_setfield(L, -2, ".type");
+       }
+
        lua_pop(L, 1);
 }