implement uci.changes() in lua binding

diff --git a/lua/uci.c b/lua/uci.c
index a73661d..f2be5d5 100644 (file)
--- a/lua/uci.c
+++ b/lua/uci.c
@@ -34,9 +34,14 @@
 #endif
 
 static struct uci_context *ctx = NULL;
+enum autoload {
+       AUTOLOAD_OFF = 0,
+       AUTOLOAD_ON = 1,
+       AUTOLOAD_FORCE = 2
+};
 
 static struct uci_package *
-find_package(lua_State *L, const char *name, bool autoload)
+find_package(lua_State *L, const char *name, enum autoload al)
 {
        struct uci_package *p = NULL;
        struct uci_element *e;
@@ -49,7 +54,9 @@ find_package(lua_State *L, const char *name, bool autoload)
                goto done;
        }
 
-       if (autoload) {
+       if (al == AUTOLOAD_FORCE)
+               uci_load(ctx, name, &p);
+       else if (al) {
                do {
                        lua_getfield(L, LUA_GLOBALSINDEX, "uci");
                        lua_getfield(L, -1, "autoload");
@@ -125,7 +132,7 @@ uci_lua_unload(lua_State *L)
 
        luaL_checkstring(L, 1);
        s = lua_tostring(L, -1);
-       p = find_package(L, s, false);
+       p = find_package(L, s, AUTOLOAD_OFF);
        if (p) {
                uci_unload(ctx, p);
                lua_pushboolean(L, 1);
@@ -174,7 +181,7 @@ uci_lua_foreach(lua_State *L)
        if (!lua_isfunction(L, 3) || !package)
                luaL_error(L, "Invalid argument");
 
-       p = find_package(L, package, true);
+       p = find_package(L, package, AUTOLOAD_ON);
        if (!p)
                goto done;
 
@@ -229,7 +236,7 @@ uci_lua_get_any(lua_State *L, bool all)
                goto error;
        }
 
-       p = find_package(L, package, true);
+       p = find_package(L, package, AUTOLOAD_ON);
        if (!p) {
                err = UCI_ERR_NOTFOUND;
                goto error;
@@ -300,7 +307,7 @@ uci_lua_add(lua_State *L)
        do {
                package = luaL_checkstring(L, 1);
                type = luaL_checkstring(L, 2);
-               p = find_package(L, package, true);
+               p = find_package(L, package, AUTOLOAD_ON);
                if (!p)
                        break;
 
@@ -351,7 +358,7 @@ uci_lua_delete(lua_State *L)
                goto error;
        }
 
-       p = find_package(L, package, true);
+       p = find_package(L, package, AUTOLOAD_ON);
        if (!p) {
                err = UCI_ERR_NOTFOUND;
                goto error;
@@ -410,7 +417,7 @@ uci_lua_set(lua_State *L)
                goto error;
        }
 
-       p = find_package(L, package, true);
+       p = find_package(L, package, AUTOLOAD_ON);
        if (!p) {
                err = UCI_ERR_NOTFOUND;
                goto error;
@@ -514,6 +521,99 @@ uci_lua_revert(lua_State *L)
        return uci_lua_package_cmd(L, CMD_REVERT);
 }
 
+static void
+uci_lua_add_change(lua_State *L, struct uci_element *e)
+{
+       struct uci_history *h;
+       const char *name;
+
+       h = uci_to_history(e);
+       if (!h->section)
+               return;
+
+       lua_getfield(L, -1, h->section);
+       if (lua_isnil(L, -1)) {
+               lua_pop(L, 1);
+               lua_createtable(L, 0, 0);
+               lua_pushvalue(L, -1); /* copy for setfield */
+               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);
+       lua_pop(L, 1);
+}
+
+static void
+uci_lua_changes_pkg(lua_State *L, const char *package)
+{
+       struct uci_package *p = NULL;
+       struct uci_element *e;
+       bool autoload = false;
+
+       p = find_package(L, package, AUTOLOAD_OFF);
+       if (!p) {
+               autoload = true;
+               p = find_package(L, package, AUTOLOAD_FORCE);
+               if (!p)
+                       return;
+       }
+
+       if (uci_list_empty(&p->history) && uci_list_empty(&p->saved_history))
+               goto done;
+
+       lua_createtable(L, 0, 0);
+       uci_foreach_element(&p->saved_history, e) {
+               uci_lua_add_change(L, e);
+       }
+       uci_foreach_element(&p->history, e) {
+               uci_lua_add_change(L, e);
+       }
+       lua_setfield(L, -2, p->e.name);
+
+done:
+       if (autoload)
+               uci_unload(ctx, p);
+}
+
+static int
+uci_lua_changes(lua_State *L)
+{
+       const char *package = NULL;
+       char **config = NULL;
+       int nargs;
+       int i;
+
+       nargs = lua_gettop(L);
+       switch(nargs) {
+       case 1:
+               package = luaL_checkstring(L, 1);
+       case 0:
+               break;
+       default:
+               luaL_error(L, "invalid argument count");
+       }
+
+       lua_createtable(L, 0, 0);
+       if (package) {
+               uci_lua_changes_pkg(L, package);
+       } else {
+               if (uci_list_configs(ctx, &config) != 0)
+                       goto done;
+
+               for(i = 0; config[i] != NULL; i++) {
+                       uci_lua_changes_pkg(L, config[i]);
+               }
+       }
+
+done:
+       return 1;
+}
+
 static int
 uci_lua_set_confdir(lua_State *L)
 {
@@ -548,6 +648,7 @@ static const luaL_Reg uci[] = {
        { "delete", uci_lua_delete },
        { "commit", uci_lua_commit },
        { "revert", uci_lua_revert },
+       { "changes", uci_lua_changes },
        { "foreach", uci_lua_foreach },
        { "set_confdir", uci_lua_set_confdir },
        { "set_savedir", uci_lua_set_savedir },