source: clean up structure

1 files changed, 156 insertions, 0 deletions

diff --git a/source/lib/include/wanda/setting.hpp b/source/lib/include/wanda/setting.hpp
new file mode 100644
index 0000000..abbd56f
--- /dev/null
+++ b/source/lib/include/wanda/setting.hpp
@@ -0,0 +1,156 @@
+/**
+ * @file    setting.hpp
+ * @author  Felix Morgner (felix.morgner@gmail.com)
+ * @since   1.0.0
+ */
+
+#ifndef WANDA_setting_HPP
+#define WANDA_setting_HPP
+
+#include "wanda/deferred_failure.hpp"
+#include "wanda/type_wrapper.hpp"
+
+#include <gio/gio.h>
+
+#include <algorithm>
+#include <cstddef>
+#include <cstdint>
+#include <memory>
+#include <optional>
+#include <string>
+#include <variant>
+#include <vector>
+
+namespace wanda
+{
+  struct setting;
+
+  /**
+   * @brief A convenience type to represent setting keys
+   */
+  using key = type_wrapper<std::string, struct KeyTag>;
+
+  namespace literals
+  {
+    /**
+     * @brief UDL to create setting keys
+     */
+    key operator""_key(char const * str, std::size_t len);
+
+    /**
+     * @brief UDL to create setting schemas
+     */
+    std::optional<setting> operator""_setting(char const * str, std::size_t lent);
+  }  // namespace literals
+
+  /**
+   * @brief A simple wrapper for GSettings Schemas
+   */
+  struct setting
+  {
+    struct entry
+    {
+      using value_type = std::variant<std::monostate, bool, std::int32_t, std::int64_t, std::uint32_t, std::uint64_t, double, std::string, std::vector<std::string>>;
+
+      /**
+       * @brief Get the value of the settings entry
+       */
+      value_type operator*() const;
+
+      /**
+       * @brief Assign the given @p value to the settings entry
+       * 
+       * @returns @p true iff. the value could be successfully assigned
+       */
+      template<typename Type>
+      bool operator=(Type value)
+      {
+        struct setting_applier
+        {
+          setting_applier(GSettings * setting, gchar const * key, Type value) noexcept
+              : m_result{[&] {
+                if constexpr (std::is_same_v<Type, bool>)
+                {
+                  return g_settings_set_boolean(setting, key, value);
+                }
+                else if constexpr (std::is_same_v<Type, std::int32_t>)
+                {
+                  return g_settings_set_int(setting, key, value);
+                }
+                else if constexpr (std::is_same_v<Type, std::int64_t>)
+                {
+                  return g_settings_set_int64(setting, key, value);
+                }
+                else if constexpr (std::is_same_v<Type, std::uint32_t>)
+                {
+                  return g_settings_set_uint(setting, key, value);
+                }
+                else if constexpr (std::is_same_v<Type, std::uint64_t>)
+                {
+                  return g_settings_set_uint64(setting, key, value);
+                }
+                else if constexpr (std::is_same_v<Type, double>)
+                {
+                  return g_settings_set_double(setting, key, value);
+                }
+                else if constexpr (std::is_same_v<Type, std::string>)
+                {
+                  return g_settings_set_string(setting, key, value.c_str());
+                }
+                else if constexpr (std::is_same_v<Type, std::vector<std::string>>)
+                {
+                  auto temp = std::vector<gchar const *>{value.size() + 1};
+                  std::transform(value.begin(), value.end(), temp.begin(), [](auto const & str) { return str.c_str(); });
+                  return g_settings_set_strv(setting, key, temp.data());
+                }
+              }()}
+          {
+          }
+
+          ~setting_applier()
+          {
+            g_settings_sync();
+          }
+
+          operator bool() const
+          {
+            return m_result;
+          }
+
+        private:
+          gboolean const m_result;
+        };
+
+        return setting_applier{m_settings.get(), m_key.get().c_str(), value};
+      }
+
+    private:
+      entry(setting const & schema, key key);
+
+      std::unique_ptr<GSettings, decltype(&g_object_unref)> m_settings;
+
+      key m_key;
+
+      friend setting;
+    };
+
+    /**
+     * @brief Get the entry for the given key
+     * 
+     * @return An <code>std::optional</code> wrapping the entry associated with
+     * the given key, or an empty <code>std::optional</code> if the desired key
+     * does not exist in the setting's schema.
+     */
+    std::optional<entry> operator[](key key) const;
+
+  private:
+    explicit setting(GSettingsSchema * schema);
+
+    std::unique_ptr<GSettingsSchema, decltype(&g_settings_schema_unref)> m_schema;
+
+    friend std::optional<setting> literals::operator""_setting(char const *, std::size_t);
+  };
+
+}  // namespace wanda
+
+#endif
\ No newline at end of file