log: move Color, printLog as private

src/log.cpp

@@ -30,6 +30,36 @@
 namespace dht {
 namespace log {
 
+/**
+ * Terminal colors for logging
+ */
+namespace Color {
+    enum Code {
+        FG_RED      = 31,
+        FG_GREEN    = 32,
+        FG_YELLOW   = 33,
+        FG_BLUE     = 34,
+        FG_DEFAULT  = 39,
+        BG_RED      = 41,
+        BG_GREEN    = 42,
+        BG_BLUE     = 44,
+        BG_DEFAULT  = 49
+    };
+    class Modifier {
+        const Code code;
+    public:
+        constexpr Modifier(Code pCode) : code(pCode) {}
+        friend std::ostream&
+        operator<<(std::ostream& os, const Modifier& mod) {
+            return os << "\033[" << mod.code << 'm';
+        }
+    };
+}
+
+constexpr const Color::Modifier def(Color::FG_DEFAULT);
+constexpr const Color::Modifier red(Color::FG_RED);
+constexpr const Color::Modifier yellow(Color::FG_YELLOW);
+
 /**
  * Print va_list to std::ostream (used for logging).
  */
@@ -46,8 +76,8 @@ printLog(std::ostream& s, char const *m, va_list args) {
     using log_precision = microseconds;
     constexpr auto den = log_precision::period::den;
     auto num = duration_cast<log_precision>(steady_clock::now().time_since_epoch()).count();
-    s << "[" << std::setfill('0') << std::setw(6) << num / den << "."
-             << std::setfill('0') << std::setw(6) << num % den << "]" << " ";
+    s << '[' << std::setfill('0') << std::setw(6) << num / den << '.'
+             << std::setfill('0') << std::setw(6) << num % den << "] ";
 
     // write log
     s.write(buffer.data(), std::min((size_t) ret, buffer.size()));