some refactoring, fix stringer func

pkg/printer/table.go

@@ -291,7 +291,7 @@ func (table *Table) AddRowLate(fields ...any) {
 	row := make([]string, len(fields))
 
 	for idx, field := range fields {
-		row[idx] = any2string(field)
+		row[idx] = stringer(field)
 	}
 
 	table.rows = append(table.rows, row)
@@ -311,9 +311,47 @@ func (table *Table) toMap() []map[string]any {
 	return raw
 }
 
-// return the length of a string but only visible chars, w/o ansi color escapes
-func visibleLen(word string) int {
-	return len(ansiCtrlSeq.ReplaceAllLiteralString(word, ""))
+func (data *Table) preprocessRows() {
+	if data.processed {
+		// only do it once
+		return
+	}
+
+	// convert entries to strings
+	data.rows = make([][]string, len(data.Entries))
+	for rowidx, entries := range data.Entries {
+		data.rows[rowidx] = make([]string, len(entries))
+
+		for colidx, entry := range data.Entries[rowidx] {
+			data.rows[rowidx][colidx] = stringer(entry)
+		}
+	}
+
+	// determine header lenght's
+	for idx, head := range data.Headers {
+		data.lenHeaders[idx] = visibleLen(head)
+	}
+
+	// determine max width per column
+	for _, entries := range data.rows {
+		currentWidth := 0
+
+		for idx, entry := range entries {
+			length := visibleLen(entry)
+
+			if data.lenHeaders[idx] < length {
+				if length > currentWidth+data.maxwidth {
+					data.lenHeaders[idx] = data.maxwidth - currentWidth
+				} else {
+					data.lenHeaders[idx] = length
+				}
+			}
+
+			currentWidth += data.lenHeaders[idx]
+		}
+	}
+
+	data.processed = true
 }
 
 func isInt(num string) bool {