config/lua: add simple layout API (#14258)

Adds a simple layout lua api

1 files changed, 98 insertions, 0 deletions

diff --git a/src/config/lua/layout/LuaLayoutTarget.cpp b/src/config/lua/layout/LuaLayoutTarget.cpp
new file mode 100644
index 00000000..9113f0fd
--- /dev/null
+++ b/src/config/lua/layout/LuaLayoutTarget.cpp
@@ -0,0 +1,98 @@
+#include "LuaLayoutTarget.hpp"
+
+#include "LuaLayoutContext.hpp"
+#include "../bindings/LuaBindingsInternal.hpp"
+#include "../objects/LuaObjectHelpers.hpp"
+#include "../objects/LuaWindow.hpp"
+
+#include "../../../layout/target/Target.hpp"
+
+#include <string_view>
+
+using namespace Config::Lua;
+using namespace Config::Lua::Layouts;
+
+static constexpr const char* TARGET_MT = "HL.LayoutTarget";
+
+namespace {
+    struct SLuaLayoutTargetRef {
+        WP<Layout::ITarget> target;
+        size_t              index = 0;
+    };
+}
+
+static int layoutTargetPlace(lua_State* L) {
+    auto* ref    = sc<SLuaLayoutTargetRef*>(luaL_checkudata(L, 1, TARGET_MT));
+    auto  target = ref->target.lock();
+    if (!target)
+        return 0;
+
+    CBox box;
+    if (!boxFromTable(L, 2, box))
+        return Bindings::Internal::configError(L, "HL.LayoutTarget: place expects a box table { x, y, w, h }");
+
+    target->setPositionGlobal(box.noNegativeSize());
+    return 0;
+}
+
+static int layoutTargetIndex(lua_State* L) {
+    auto*                  ref = sc<SLuaLayoutTargetRef*>(luaL_checkudata(L, 1, TARGET_MT));
+    const std::string_view key = luaL_checkstring(L, 2);
+
+    auto                   target = ref->target.lock();
+    if (!target) {
+        lua_pushnil(L);
+        return 1;
+    }
+
+    if (key == "index")
+        lua_pushinteger(L, sc<lua_Integer>(ref->index));
+    else if (key == "window") {
+        const auto window = target->window();
+        if (window)
+            Objects::CLuaWindow::push(L, window);
+        else
+            lua_pushnil(L);
+    } else if (key == "box")
+        pushBox(L, target->position());
+    else if (key == "place" || key == "set_box")
+        lua_pushcfunction(L, layoutTargetPlace);
+    else
+        lua_pushnil(L);
+
+    return 1;
+}
+
+static int layoutTargetGc(lua_State* L) {
+    sc<SLuaLayoutTargetRef*>(lua_touserdata(L, 1))->~SLuaLayoutTargetRef();
+    return 0;
+}
+
+static int layoutTargetToString(lua_State* L) {
+    auto* ref    = sc<SLuaLayoutTargetRef*>(luaL_checkudata(L, 1, TARGET_MT));
+    auto  target = ref->target.lock();
+    if (!target)
+        lua_pushstring(L, "HL.LayoutTarget(expired)");
+    else
+        lua_pushfstring(L, "HL.LayoutTarget(%d)", sc<int>(ref->index));
+    return 1;
+}
+
+void Config::Lua::Layouts::setupLayoutTarget(lua_State* L) {
+    luaL_newmetatable(L, TARGET_MT);
+    lua_pushcfunction(L, layoutTargetIndex);
+    lua_setfield(L, -2, "__index");
+    lua_pushcfunction(L, Objects::readOnlyNewIndex);
+    lua_setfield(L, -2, "__newindex");
+    lua_pushcfunction(L, layoutTargetGc);
+    lua_setfield(L, -2, "__gc");
+    lua_pushcfunction(L, layoutTargetToString);
+    lua_setfield(L, -2, "__tostring");
+    lua_pop(L, 1);
+}
+
+void Config::Lua::Layouts::pushLayoutTarget(lua_State* L, const SP<Layout::ITarget>& target, size_t index) {
+    new (lua_newuserdata(L, sizeof(SLuaLayoutTargetRef))) SLuaLayoutTargetRef{target, index};
+    luaL_getmetatable(L, TARGET_MT);
+    lua_setmetatable(L, -2);
+}