Configuration class rework

- castToString is now a free function
- setFromString split away from setValue
- moved Configuration to src

1 files changed, 83 insertions, 0 deletions

diff --git a/src/configuration.h b/src/configuration.h
new file mode 100644
index 0000000..8173a86
--- /dev/null
+++ b/src/configuration.h
@@ -0,0 +1,83 @@
+/*
+ * This file is part of smolbote. It's copyrighted by the contributors recorded
+ * in the version control history of the file, available from its original
+ * location: https://neueland.iserlohn-fortress.net/smolbote.hg
+ *
+ * SPDX-License-Identifier: GPL-3.0
+ */
+
+#ifndef CONFIGURATION_H
+#define CONFIGURATION_H
+
+#include <libconfig.h++>
+#include <optional>
+#include <string>
+#include <vector>
+#include <QString>
+
+std::string castToString(const libconfig::Setting &v);
+void setFromString(libconfig::Setting &setting, const std::string &value);
+
+class Configuration
+{
+public:
+    explicit Configuration(const std::string &path, const std::string &home);
+    ~Configuration();
+
+    bool read(const QString &path);
+    bool writeIfNeeded(const std::string &path = std::string());
+
+    std::vector<std::string> childrenSettings(const char *name = "");
+    std::vector<std::string> childrenGroups(const char *name = "");
+
+    template <typename T>
+    std::optional<T> value(const char *path) const
+    {
+        // if setting doesn't exist, give back a nullopt
+        if(!m_userCfg->exists(path)) {
+            return std::nullopt;
+        }
+
+        const libconfig::Setting &v = m_userCfg->lookup(path);
+        if constexpr(std::is_same_v<T, std::string>) {
+            std::string r = castToString(v);
+
+            // check if it's a path
+            if(r.front() == '~') {
+                r.replace(0, 1, m_homePath);
+            }
+
+            return std::optional<std::string>(r);
+        } else
+            return std::optional<T>(static_cast<T>(v));
+    }
+
+    template <typename T>
+    bool setValue(std::string path, const T &val)
+    {
+        if(!m_userCfg->exists(path)) {
+            return false;
+        }
+
+        libconfig::Setting &setting = m_userCfg->lookup(path);
+        // compiler complained about operator= not taking unsinged ints, longs and long longs
+        if constexpr(std::is_unsigned_v<T> && !std::is_same_v<T, bool>) {
+            setting = static_cast<typename std::make_signed_t<T>>(val);
+        } else if constexpr(std::is_same_v<T, std::string>) {
+            setFromString(setting, val);
+        } else {
+            setting = val;
+        }
+
+        changed = true;
+        return true;
+    }
+
+private:
+    bool changed = false;
+    std::string m_homePath;
+    std::string m_userCfgPath;
+    libconfig::Config *m_userCfg;
+};
+
+#endif // CONFIGURATION_H