core: implement basic XDG Base Specification support

1 files changed, 47 insertions, 0 deletions

diff --git a/src/xdg.cpp b/src/xdg.cpp
new file mode 100644
index 0000000..9293151
--- /dev/null
+++ b/src/xdg.cpp
@@ -0,0 +1,47 @@
+#include "xdg.hpp"
+
+#include <unistd.h>
+
+namespace wanda
+{
+
+std::string xdg_variable(xdg_directory directory)
+{
+    switch (directory)
+    {
+    case xdg_directory::data_home:
+        return "XDG_DATA_HOME";
+    case xdg_directory::config_home:
+        return "XDG_CONFIG_HOME";
+    case xdg_directory::cache_home:
+        return "XDG_CACHE_HOME";
+    case xdg_directory::runtime_dir:
+        return "XDG_RUNTIME_DIR";
+    }
+    return "XDG_INVALID_PATH";
+}
+
+std::filesystem::path xdg_path_for(xdg_directory directory, environment const &environment)
+{
+    if (auto path = environment[xdg_variable(directory)]; !path.empty())
+    {
+        return path;
+    }
+
+    auto home = std::filesystem::path{environment["HOME"]};
+    switch (directory)
+    {
+    case xdg_directory::data_home:
+        return home / ".local/share";
+    case xdg_directory::config_home:
+        return home / ".config";
+    case xdg_directory::cache_home:
+        return home / ".cache";
+    case xdg_directory::runtime_dir:
+        return std::filesystem::path{"/run/user"} / std::to_string(::getuid());
+    }
+
+    return "";
+}
+
+} // namespace wanda
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