Modules

o colors are not nestable. o keywords are case-sensitive, o ANSI escape sequences are not universally supported by all terminal emulators; and normally should be suppressed when not going to a tty device. Therefore, you should use M_system::system_istty(3f) or the common Fortran extension ISATTY() to set the default to “plain” instead of “color” when the output file is not a conforming terminal. On basic MSWindows console windows, it is best to use Windows 10+ and/or the Linux mode; you may have to enable ANSI escape sequence mode on MSWindows. It does work as-is with CygWin and MinGW and Putty windows and mintty(1) as tested.