add block.reload_script, item.reload_script

src/content/Content.hpp

@@ -121,6 +121,14 @@ public:
         return *found->second;
     }
 
+    T& require(const std::string& id) {
+        const auto& found = defs.find(id);
+        if (found == defs.end()) {
+            throw std::runtime_error("missing content unit " + id);
+        }
+        return *found->second;
+    }
+
     const auto& getDefs() const {
         return defs;
     }

src/content/ContentLoader.cpp

@@ -853,26 +853,40 @@ void ContentLoader::load() {
 }
 
 template <class T>
-static void load_scripts(Content& content, ContentUnitDefs<T>& units) {
-    for (const auto& [name, def] : units.getDefs()) {
-        size_t pos = name.find(':');
-        if (pos == std::string::npos) {
-            throw std::runtime_error("invalid content unit name");
-        }
-        const auto runtime = content.getPackRuntime(name.substr(0, pos));
-        const auto& pack = runtime->getInfo();
-        const auto& folder = pack.folder;
-        auto scriptfile = folder / ("scripts/" + def->scriptName + ".lua");
-        if (io::is_regular_file(scriptfile)) {
-            scripting::load_content_script(
-                runtime->getEnvironment(),
-                name,
-                scriptfile,
-                def->scriptFile,
-                def->rt.funcsset
-            );
-        }
+static void load_script(const Content& content, T& def) {
+    const auto& name = def.name;
+    size_t pos = name.find(':');
+    if (pos == std::string::npos) {
+        throw std::runtime_error("invalid content unit name");
     }
+    const auto runtime = content.getPackRuntime(name.substr(0, pos));
+    const auto& pack = runtime->getInfo();
+    const auto& folder = pack.folder;
+    auto scriptfile = folder / ("scripts/" + def.scriptName + ".lua");
+    if (io::is_regular_file(scriptfile)) {
+        scripting::load_content_script(
+            runtime->getEnvironment(),
+            name,
+            scriptfile,
+            def.scriptFile,
+            def.rt.funcsset
+        );
+    }
+}
+
+template <class T>
+static void load_scripts(const Content& content, ContentUnitDefs<T>& units) {
+    for (const auto& [_, def] : units.getDefs()) {
+        load_script(content, *def);
+    }
+}
+
+void ContentLoader::reloadScript(const Content& content, Block& block) {
+    load_script(content, block);
+}
+
+void ContentLoader::reloadScript(const Content& content, ItemDef& item) {
+    load_script(content, item);
 }
 
 void ContentLoader::loadScripts(Content& content) {

src/content/ContentLoader.hpp

@@ -77,4 +77,6 @@ public:
     void load();
 
     static void loadScripts(Content& content);
+    static void reloadScript(const Content& content, Block& block);
+    static void reloadScript(const Content& content, ItemDef& item);
 };

src/engine/Engine.cpp

@@ -484,6 +484,10 @@ const Content* Engine::getContent() const {
     return content.get();
 }
 
+Content* Engine::getWriteableContent() {
+    return content.get();
+}
+
 std::vector<ContentPack> Engine::getAllContentPacks() {
     auto packs = getContentPacks();
     packs.insert(packs.begin(), ContentPack::createCore(paths));

src/engine/Engine.hpp

@@ -151,6 +151,8 @@ public:
     /// @brief Get current Content instance
     const Content* getContent() const;
 
+    Content* getWriteableContent();
+
     /// @brief Get selected content packs
     std::vector<ContentPack>& getContentPacks();
 

src/logic/scripting/lua/libs/libblock.cpp

@@ -1,4 +1,5 @@
 #include "content/Content.hpp"
+#include "content/ContentLoader.hpp"
 #include "lighting/Lighting.hpp"
 #include "logic/BlocksController.hpp"
 #include "logic/LevelController.hpp"
@@ -12,6 +13,7 @@
 #include "world/Level.hpp"
 #include "maths/voxmaths.hpp"
 #include "data/StructLayout.hpp"
+#include "engine/Engine.hpp"
 #include "api_lua.hpp"
 
 using namespace scripting;
@@ -617,6 +619,17 @@ static int l_set_field(lua::State* L) {
     return set_field(L, dst, *field, index, dataStruct, value);
 }
 
+static int l_reload_script(lua::State* L) {
+    auto name = lua::require_string(L, 1);
+    if (content == nullptr) {
+        throw std::runtime_error("content is not initialized");
+    }
+    auto& writeableContent = *engine->getWriteableContent();
+    auto& def = writeableContent.blocks.require(name);
+    ContentLoader::reloadScript(writeableContent, def);
+    return 0;
+}
+
 const luaL_Reg blocklib[] = {
     {"index", lua::wrap<l_index>},
     {"name", lua::wrap<l_get_def>},
@@ -652,5 +665,6 @@ const luaL_Reg blocklib[] = {
     {"decompose_state", lua::wrap<l_decompose_state>},
     {"get_field", lua::wrap<l_get_field>},
     {"set_field", lua::wrap<l_set_field>},
+    {"reload_script", lua::wrap<l_reload_script>},
     {NULL, NULL}
 };

src/logic/scripting/lua/libs/libitem.cpp

@@ -1,6 +1,8 @@
 #include "content/Content.hpp"
+#include "content/ContentLoader.hpp"
 #include "items/ItemDef.hpp"
 #include "api_lua.hpp"
+#include "engine/Engine.hpp"
 
 using namespace scripting;
 
@@ -87,6 +89,17 @@ static int l_uses(lua::State* L) {
     return 0;
 }
 
+static int l_reload_script(lua::State* L) {
+    auto name = lua::require_string(L, 1);
+    if (content == nullptr) {
+        throw std::runtime_error("content is not initialized");
+    }
+    auto& writeableContent = *engine->getWriteableContent();
+    auto& def = writeableContent.items.require(name);
+    ContentLoader::reloadScript(writeableContent, def);
+    return 0;
+}
+
 const luaL_Reg itemlib[] = {
     {"index", lua::wrap<l_index>},
     {"name", lua::wrap<l_name>},
@@ -98,5 +111,6 @@ const luaL_Reg itemlib[] = {
     {"model_name", lua::wrap<l_model_name>},
     {"emission", lua::wrap<l_emission>},
     {"uses", lua::wrap<l_uses>},
+    {"reload_script", lua::wrap<l_reload_script>},
     {NULL, NULL}
 };