Optimise queues and rendering

src/settings.cpp

@@ -0,0 +1,75 @@
+#include "settings.h"
+
+#include <iostream>
+#include <fstream>
+
+void Settings::load(const std::string &filename)
+{
+    std::ifstream file(filename);
+    if (!file.is_open())
+    {
+        std::cerr << "[Settings] Cannot open “" << filename << "”" << std::endl;
+        return;
+    }
+
+    std::string line;
+    while (std::getline(file, line))
+    {
+        // strip comments
+        std::size_t p = line.find('#');
+        if (p != std::string::npos)
+            line.erase(p);
+
+        // trim
+        trim(line);
+        if (line.empty())
+            continue;
+
+        // split on '='
+        std::size_t eq = line.find('=');
+        if (eq == std::string::npos)
+            continue;
+        std::string key = line.substr(0, eq);
+        std::string value = line.substr(eq + 1);
+        trim(key);
+        trim(value);
+
+        // lookup in registry
+        bool found = false;
+        for (ISetting *setting : _settings())
+        {
+            if (setting->name == key)
+            {
+                setting->parse(value);
+                found = true;
+                break;
+            }
+        }
+        if (!found)
+            std::cerr << "[Settings] Unknown key “" << key << "”" << std::endl;
+    }
+}
+
+void Settings::print()
+{
+    for (ISetting *setting : _settings())
+    {
+        std::cout << "[Settings] " << setting->name << " = " << setting->asString() << "\n";
+    }
+}
+
+void Settings::trim(std::string &s)
+{
+    // Left trim
+    s.erase(s.begin(),
+            std::find_if(s.begin(), s.end(),
+                         [](unsigned char c)
+                         { return !std::isspace(c); }));
+
+    // Right trim
+    s.erase(std::find_if(s.rbegin(), s.rend(),
+                         [](unsigned char c)
+                         { return !std::isspace(c); })
+                .base(),
+            s.end());
+}