Fmt_ttyFmt TTY setup.
Fmt_tty provides simple automatic setup on channel formatters for:
Fmt.set_style_renderer. `Ansi_tty is used if the channel is a tty and the environment variable TERM is defined and its value is not "dumb". `None is used otherwise.Fmt.set_utf_8. true is used if one of the following environment variables has "UTF-8" as a case insensitive substring: LANG, LC_ALL, LC_CTYPE.val setup : ?style_renderer:Fmt.style_renderer -> ?utf_8:bool -> out_channel -> Format.formattersetup ?style_renderer ?utf_8 outc is a formatter for outc with Fmt.set_style_renderer and Fmt.set_utf_8 correctly setup. If style_renderer or utf_8 are specified they override the automatic setup.
If outc is stdout, Fmt.stdout is returned. If outc is stderr, Fmt.stderr is returned.
val setup_std_outputs : ?style_renderer:Fmt.style_renderer -> ?utf_8:bool -> unit -> unitsetup_std_outputs ?style_renderer ?utf_8 () applies setup on stdout and stderr.