Manager: Add config file parsing

src/config.cpp

@@ -4,7 +4,13 @@
  * SPDX-License-Identifier: MIT
  */
 
+#include <csignal> // raise
+#include <cstdio>  // fprintf
+#include <fstream> // ifstream
 #include <string>
+#include <vector>
+
+#include "nlohmann/json.hpp"
 
 #include "config.h"
 
@@ -13,6 +19,7 @@ Config::Config(s)
 	, m_workingDirectorySize(m_workingDirectory.string().size())
 {
 	findConfigFile();
+	parseConfigFile();
 }
 
 Config::~Config()
@@ -36,3 +43,57 @@ void Config::findConfigFile()
 	printf("Found config file @ %s\n", m_config.c_str() + m_workingDirectorySize + 1);
 #endif
 }
+
+void Config::parseConfigFile()
+{
+	if (m_config.empty()) {
+		return;
+	}
+
+	nlohmann::json json;
+
+	std::ifstream file(m_config);
+	if (!file.is_open()) {
+		return;
+	}
+
+	try {
+		file >> json;
+	}
+	catch (...) {
+		fprintf(stderr, "\033[31;1mConfig:\033[0m json syntax error\n");
+		raise(SIGABRT);
+		return;
+	}
+
+	m_settings = json.get<Settings>();
+}
+
+// -----------------------------------------
+
+void to_json(nlohmann::json& object, const Settings& settings)
+{
+	object = nlohmann::json {
+		{ "excludePaths", settings.excludePaths },
+		{ "systemDirectories", settings.systemDirectories }
+	};
+}
+
+void from_json(const nlohmann::json& object, Settings& settings)
+{
+	if (object.find("excludePaths") != object.end()) {
+		object.at("excludePaths").get_to(settings.excludePaths);
+	}
+
+	if (object.find("systemDirectories") != object.end()) {
+		object.at("systemDirectories").get_to(settings.systemDirectories);
+	}
+
+	// Check for correct exclude type values
+	for (const auto& path : settings.excludePaths) {
+		if (path.second != "file" && path.second != "directory" && path.second != "endsWith") {
+			fprintf(stderr, "\033[31;1mConfig:\033[0m invalid exclude type '%s'\n", path.second.c_str());
+			raise(SIGABRT);
+		}
+	}
+}

src/config.h

@@ -7,11 +7,31 @@
 #ifndef CONFIG_H
 #define CONFIG_H
 
-#include <cstddef> // size_t
-#include <filesystem>
+#include <cstddef>    // size_t
+#include <filesystem> // path
+#include <map>
+#include <string>
+#include <vector>
+
+#include "nlohmann/json.hpp"
 
 #include "util/singleton.h"
 
+struct Settings {
+	std::map<std::string, std::string> excludePaths {
+		{ ".git", "directory" },
+		{ ".md", "endsWith" },
+		{ "packages", "file" },
+		{ "README.org", "endsWith" },
+		{ "screenshot.png", "file" },
+	};
+	std::vector<std::filesystem::path> systemDirectories {
+		"/boot",
+		"/etc",
+		"/usr/share"
+	};
+};
+
 class Config : public Util::Singleton<Config> {
 public:
 	Config(s);
@@ -19,12 +39,17 @@ public:
 
 	void setVerbose(bool verbose) { m_verbose = verbose; }
 
+	const std::map<std::string, std::string>& excludePaths() const { return m_settings.excludePaths; }
+	const std::vector<std::filesystem::path>& systemDirectories() const { return m_settings.systemDirectories; }
+
 	const std::filesystem::path& workingDirectory() const { return m_workingDirectory; }
 	size_t workingDirectorySize() const { return m_workingDirectorySize; }
+
 	bool verbose() const { return m_verbose; }
 
 private:
 	void findConfigFile();
+	void parseConfigFile();
 
 	bool m_verbose { false };
 
@@ -32,6 +57,14 @@ private:
 	size_t m_workingDirectorySize { 0 };
 
 	std::filesystem::path m_config;
+	Settings m_settings;
 };
 
+// -----------------------------------------
+
+// nlohmann::json arbitrary type conversion functions
+
+void to_json(nlohmann::json& object, const Settings& settings);
+void from_json(const nlohmann::json& object, Settings& settings);
+
 #endif // CONFIG_H