The problem with #3072 is that it modifies every output line with an if (csv) to get csv output. This is tedious and error-prone. A better approach would be to have a new formatted printf() that extracts the format statements and outputs in CSV format if a format is set, otherwise uses the full format information.

• Implement a unified formatter that either outputs in CSV format or using the format string.
• Adopt Jgru add csv output to mmls #3072 to use it.
• Add a test for both formatted output and CSV output for mmls.