add platform::get_executable_path (#638)

src/util/platform.cpp

@@ -10,13 +10,22 @@
 #include "stringutil.hpp"
 #include "typedefs.hpp"
 #include "debug/Logger.hpp"
-
-static debug::Logger logger("platform");
+#include "frontend/locale.hpp"
 
 #ifdef _WIN32
 #include <Windows.h>
 #pragma comment(lib, "winmm.lib")
+#else
+#include <unistd.h>
+#endif
 
+namespace platform::internal {
+    std::filesystem::path get_executable_path();
+}
+
+static debug::Logger logger("platform");
+
+#ifdef _WIN32
 void platform::configure_encoding() {
     // set utf-8 encoding to console output
     SetConsoleOutputCP(CP_UTF8);
@@ -83,9 +92,6 @@ bool platform::open_url(const std::string& url) {
 
 #else // _WIN32
 
-#include <unistd.h>
-#include "frontend/locale.hpp"
-
 void platform::configure_encoding() {
 }
  
@@ -158,3 +164,47 @@ void platform::open_folder(const std::filesystem::path& folder) {
 
 #endif
 }
+
+std::filesystem::path platform::get_executable_path() {
+#ifdef _WIN32
+    wchar_t buffer[MAX_PATH];
+    DWORD result = GetModuleFileNameW(NULL, buffer, MAX_PATH);
+    if (result == 0) {
+        DWORD error = GetLastError();
+        throw std::runtime_error("GetModuleFileName failed with code: " + std::to_string(error));
+    }
+
+    int size = WideCharToMultiByte(
+        CP_UTF8, 0, buffer, -1, nullptr, 0, nullptr, nullptr
+    );
+    if (size == 0) {
+        throw std::runtime_error("could not get executable path");
+    }
+    std::string str(size, 0);
+    size = WideCharToMultiByte(
+        CP_UTF8, 0, buffer, -1, str.data(), size, nullptr, nullptr
+    );
+    if (size == 0) {
+        DWORD error = GetLastError();
+        throw std::runtime_error("WideCharToMultiByte failed with code: " + std::to_string(error));
+    }
+    str.resize(size - 1);
+    return std::filesystem::path(str);
+
+#elif defined(__APPLE__)
+    auto path = platform::internal::get_executable_path();
+    if (path.empty()) {
+        throw std::runtime_error("could not get executable path");
+    }
+    return path;
+#else
+    char buffer[1024];
+    ssize_t count = readlink("/proc/self/exe", buffer, sizeof(buffer));
+    if (count != -1) {
+        return std::filesystem::canonical(std::filesystem::path(
+            std::string(buffer, static_cast<size_t>(count))
+        ));
+    }
+    throw std::runtime_error("could not get executable path");
+#endif
+}

src/util/platform.hpp

@@ -5,13 +5,17 @@
 
 namespace platform {
     void configure_encoding();
-    /// @return environment locale in ISO format ll_CC
+    /// @brief Get Environment locale in ISO format ll_CC
     std::string detect_locale();
     /// @brief Open folder using system file manager asynchronously
     /// @param folder target folder
     void open_folder(const std::filesystem::path& folder);
-    /// Makes the current thread sleep for the specified amount of milliseconds.
+    /// @brief Makes the current thread sleep for the specified amount of milliseconds.
     void sleep(size_t millis);
+    /// @brief Get current process id 
     int get_process_id();
+    /// @brief Get current process running executable path  
+    std::filesystem::path get_executable_path();
+    /// @brief Open URL in web browser 
     bool open_url(const std::string& url);
 }

src/util/platform_internal.cpp

@@ -0,0 +1,24 @@
+#include <filesystem>
+
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+
+#ifdef __APPLE__
+#include <mach-o/dyld.h> 
+#endif
+
+namespace platform::internal {
+    std::filesystem::path get_executable_path() {
+#ifdef __APPLE__
+        char buffer[1024];
+        uint32_t size = sizeof(buffer);
+        if (_NSGetExecutablePath(buffer, &size) == 0) {
+            return std::filesystem::canonical(std::filesystem::path(buffer));
+        } else {
+            return std::filesystem::path();
+        }
+#endif
+        return std::filesystem::path();
+    }
+}