FormatExpander

Module.cs

@@ -20,6 +20,44 @@ using Config;
 
 namespace i3csstatus;
 
+class FormatExpander
+{
+	static public string Expand(string f, Func<string, string> callback)
+	{
+		StringBuilder sb = new();
+		StringBuilder arg = null;
+		bool freeClosing = false;
+		foreach(char c in f)
+		{
+			if(arg == null && c == '{') arg = new();
+			else
+			if(arg != null && c == '{')
+			{
+				sb.Append('{');
+				arg = null;
+			}
+			else
+			if(arg == null && c == '}')
+			{
+				if(freeClosing) sb.Append('}');
+				freeClosing = !freeClosing;
+			}
+			else
+			if(arg != null && c == '}')
+			{
+				sb.Append(callback(arg.ToString()));
+				arg = null;
+			}
+			else
+			if(arg != null)
+				arg.Append(c);
+			else
+				sb.Append(c);
+		}
+		return sb.ToString();
+	}
+}
+
 class ModuleException: Exception
 {
 }