Project Loader: resolve relative project file paths via CLI to absolu…

…te paths

frontend/main/src/CLIConfigParsing.cpp

@@ -48,6 +48,7 @@ std::pair<RuntimeConfig, GlobalValueStore> megamol::frontend::handle_cli_and_con
     RuntimeConfig config;
 
     config.megamol_executable_directory = getExecutableDirectory().u8string();
+    config.megamol_current_working_directory = std::filesystem::current_path().u8string();
 
     // config files are already checked to exist in file system
     config.configuration_files = extract_config_file_paths(argc, argv);

frontend/resources/include/MegaMolProject.h

@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <cassert>
 #include <filesystem>
 #include <optional>
 #include <string>
@@ -27,6 +28,7 @@ struct MegaMolProject {
     std::optional<ProjectAttributes> attributes = std::nullopt;
 
     void setProjectFile(path const& file) {
+        assert(file.is_absolute());
         ProjectAttributes a;
         a.project_file = file;
         a.project_directory = path{file}.remove_filename(); // leaves trailing '/'

frontend/resources/include/RuntimeConfig.h

@@ -31,7 +31,8 @@ struct RuntimeConfig {
     std::vector<std::string> configuration_file_contents = {};
     std::vector<StringPair> cli_options_from_configs = {}; // mmSetCliOption - set config/option values accepted in CLI
     std::vector<std::string> configuration_file_contents_as_cli = {};
-    Path megamol_executable_directory = "";      // mmGetMegaMolExecutableDirectory
+    Path megamol_executable_directory = ""; // mmGetMegaMolExecutableDirectory
+    Path megamol_current_working_directory = "";
     Path application_directory = "";             // mmSetAppDir
     std::vector<Path> resource_directories = {}; // mmAddResourceDir
     std::vector<Path> shader_directories = {};   // mmAddShaderDir

frontend/services/project_loader/ProjectLoader_Service.cpp

@@ -10,6 +10,7 @@
 #include <fstream>
 #include <sstream>
 
+#include "RuntimeConfig.h"
 #include "Window_Events.h"
 #include "mmcore/utility/String.h"
 #include "mmcore/utility/graphics/ScreenShotComments.h"
@@ -54,7 +55,12 @@ bool ProjectLoader_Service::init(const Config& config) {
         {"MegaMolProject", m_current_project},
     };
 
-    this->m_requestedResourcesNames = {"ExecuteLuaScript", "SetScriptPath", "optional<WindowEvents>"};
+    this->m_requestedResourcesNames = {
+        "ExecuteLuaScript",
+        "SetScriptPath",
+        "optional<WindowEvents>",
+        "RuntimeConfig",
+    };
 
     log("initialized successfully");
     return true;
@@ -115,14 +121,18 @@ bool ProjectLoader_Service::load_file(std::filesystem::path const& filename) con
     using SetScriptPath = std::function<void(std::string const&)>;
     const SetScriptPath& set_script_path = m_requestedResourceReferences[1].getResource<SetScriptPath>();
 
+    const frontend_resources::RuntimeConfig& rt_config =
+        m_requestedResourceReferences[3].getResource<frontend_resources::RuntimeConfig>();
+
     set_script_path(filename.generic_u8string());
     // TODO: we have a timing issue with the script path / project path here
     // the lua script path resource gets updated by the lua service at the beginning of each frame
     // but here the project service needs to set the project file/directory right before the lua code gets executed,
     // such that the project path is known to the megamol graph when constructing modules with file path parameters
     // thus we sed the current project path resource, which the megamol graph can look into
     // somewhat of a very thight coupling here to pass information into the lua interpreter but currently no other solution...
-    const_cast<ProjectLoader_Service*>(this)->m_current_project.setProjectFile(filename);
+    const_cast<ProjectLoader_Service*>(this)->m_current_project.setProjectFile(
+        filename.is_absolute() ? filename : (rt_config.megamol_current_working_directory / filename));
 
     auto result = execute_lua(script);
     bool script_ok = std::get<0>(result);