add get_home_directory function

meson.build

@@ -8,6 +8,7 @@ raven_dep = dependency('raven')
 
 executable(
   'filemanager',
+  './src/Dirs.cpp',
   './src/FileButton.cpp',
   './src/DirectoryView.cpp',
   './src/TopBar.cpp',

src/Dirs.cpp

@@ -0,0 +1,11 @@
+#include "Dirs.hpp"
+
+#include <cstdlib>
+
+std::filesystem::path get_home_directory() {
+    auto home_env = std::getenv("HOME");
+    if (!home_env || !std::filesystem::exists(home_env)) {
+        return "/";
+    }
+    return home_env;
+}

src/Dirs.hpp

@@ -0,0 +1,5 @@
+#pragma once
+
+#include <filesystem>
+
+std::filesystem::path get_home_directory();