Clean up pass

apps/RenderCadenceCompositor/app/AppConfigProvider.cpp

@@ -7,11 +7,22 @@
 #include <cstdlib>
 #include <fstream>
 #include <sstream>
+#include <vector>
+#include <windows.h>
 
 namespace RenderCadenceCompositor
 {
 namespace
 {
+std::filesystem::path ExecutableDirectory()
+{
+	char path[MAX_PATH] = {};
+	const DWORD length = GetModuleFileNameA(nullptr, path, static_cast<DWORD>(sizeof(path)));
+	if (length == 0 || length >= sizeof(path))
+		return std::filesystem::current_path();
+	return std::filesystem::path(path).parent_path();
+}
+
 std::string ReadTextFile(const std::filesystem::path& path, std::string& error)
 {
 	std::ifstream input(path, std::ios::binary);
@@ -76,6 +87,17 @@ AppConfigProvider::AppConfigProvider() :
 {
 }
 
+bool AppConfigProvider::LoadDefault(std::string& error)
+{
+	const std::filesystem::path path = FindConfigFile();
+	if (path.empty())
+	{
+		error = "Could not locate config/runtime-host.json from current directory or executable directory.";
+		return false;
+	}
+	return Load(path, error);
+}
+
 bool AppConfigProvider::Load(const std::filesystem::path& path, std::string& error)
 {
 	mConfig = DefaultAppConfig();
@@ -183,4 +205,28 @@ void VideoFormatDimensions(const std::string& formatName, unsigned& width, unsig
 	width = 1920;
 	height = 1080;
 }
+
+std::filesystem::path FindConfigFile(const std::filesystem::path& relativePath)
+{
+	std::vector<std::filesystem::path> starts;
+	starts.push_back(std::filesystem::current_path());
+	starts.push_back(ExecutableDirectory());
+
+	for (std::filesystem::path start : starts)
+	{
+		for (;;)
+		{
+			const std::filesystem::path candidate = start / relativePath;
+			if (std::filesystem::exists(candidate))
+				return candidate;
+
+			const std::filesystem::path parent = start.parent_path();
+			if (parent.empty() || parent == start)
+				break;
+			start = parent;
+		}
+	}
+
+	return std::filesystem::path();
+}
 }