feat: integrate goldmark Pos() for better error reporting

renderer/util.go

@@ -0,0 +1,19 @@
+package renderer
+
+// GetLineCol returns the 1-based line and column for a given byte offset in the source.
+func GetLineCol(source []byte, offset int) (line, col int) {
+	line = 1
+	col = 1
+	if offset > len(source) {
+		offset = len(source)
+	}
+	for i := 0; i < offset; i++ {
+		if source[i] == '\n' {
+			line++
+			col = 1
+		} else {
+			col++
+		}
+	}
+	return line, col
+}