Logger: add an indent level system.

This will help when I'll re-add printing for property types.

src/Logger/Logger.cpp

@@ -24,6 +24,8 @@
 #include <Corrade/Containers/GrowableArray.h>
 #include <Corrade/Utility/Debug.h>
 
+#include <Magnum/Types.h>
+
 #include "Logger.h"
 
 using Containers::Array;
@@ -31,12 +33,16 @@ using Utility::Debug;
 using Utility::Warning;
 using Utility::Error;
 
+using namespace Magnum;
+
 namespace MassBuilderSaveTool { namespace Logger {
 
 #ifndef SAVETOOL_DEBUG_BUILD
 static std::ofstream log_file{"SaveToolLog.txt", std::ios::trunc};
 #endif
 
+static UnsignedInt _indentLevel = 0;
+
 static std::mutex _logMutex;
 
 static Array<LogEntry> _entries;
@@ -70,6 +76,10 @@ operator<<(Debug& out, const LogEntry& entry) {
 
 #undef DEBUG_COLOUR
 
+    for(UnsignedInt i = 0; i < _indentLevel; i++) {
+        out << Debug::nospace << "    "_s << Debug::nospace;
+    }
+
     out << entry.message << Debug::resetColor;
 
     return out;
@@ -80,6 +90,18 @@ initialise() {
     arrayReserve(_entries, 100);
 }
 
+void
+indent() {
+    _indentLevel++;
+}
+
+void
+unindent() {
+    if(_indentLevel > 0) {
+        _indentLevel--;
+    }
+}
+
 void
 addEntry(EntryType type, StringView message) {
     auto time = std::time(nullptr);

src/Logger/Logger.h

@@ -44,14 +44,15 @@ struct LogEntry {
 
 void initialise();
 
+void indent();
+void unindent();
+
 void addEntry(EntryType type, StringView message);
 
 auto entries() -> ArrayView<const LogEntry>;
 
 void lockMutex();
-
 void unlockMutex();
-
 bool tryLockMutex();
 
 } // Logger