.Dd December 15, 2019
.Dt HI 1
.Os
.
.Sh NAME
.Nm hi
.Nd syntax highlighter
.
.Sh SYNOPSIS
.Nm
.Op Fl t
.Op Fl f Ar format
.Op Fl l Ar lang
.Op Fl n Ar name
.Op Fl o Ar opts
.Op Ar file
.Nm
.Fl c
.
.Sh DESCRIPTION
.Nm
highlights the contents of a
.Ar file
or standard input
and formats it
on standard output.
.
.Pp
The arguments are as follows:
.Bl -tag -width "-f format"
.It Fl c
Compile all regular expressions and exit.
.It Fl f Ar format
Set the output format.
.It Fl l Ar lang
Set the input language.
.It Fl n Ar name
Override the name used
to infer the input language.
.It Fl o Ar opts
Set output format options.
.Ar opts
is a comma-separated list of options.
.It Fl t
Default to
.Cm text
if the input language cannot be inferred.
.El
.
.Ss Output Formats
The default output format is
.Cm ansi .
.
.Bl -tag -width Ds
.It Cm ansi
Output ANSI terminal escape codes.
.
.It Cm irc
Output IRC formatting codes.
.Pp
The options are as follows:
.Bl -tag -width "monospace"
.It Cm monospace
Use the monospace formatting code
introduced by IRCCloud.
.El
.
.It Cm html
Output HTML
.Sy <pre>
with
.Sy <span>
classes.
.
.Pp
The options are as follows:
.Bl -tag -width "title=..."
.It Cm anchor
Output tags
(top-level definition names)
as anchor links.
.
.It Cm css Ns = Ns Ar url
With
.Cm document ,
output a
.Sy <link>
element for the external stylesheet
.Ar url .
If unset,
output default styles in a
.Sy <style>
element.
.
.It Cm document
Output an HTML document.
.
.It Cm inline
Output inline
.Sy style
attributes rather than classes.
.
.It Cm tab Ns = Ns Ar n
With
.Cm document
or
.Cm inline ,
set the
.Sy tab-size
property to
.Ar n .
.
.It Cm title Ns = Ns Ar ...
With
.Cm document ,
set the
.Sy <title>
element text.
The default title is the
.Ar file
name.
.El
.El
.
.Ss Input Languages
If no input language is set with
.Fl l ,
it may be inferred from the name set by
.Fl m
or from the provided
.Ar file
name.
.
.Bl -tag -width Ds
.It Cm c
The C11 language.
.
.It Cm diff
The output of
.Xr diff 1
with the
.Fl u
flag.
.
.It Cm make
The portable subset of
.Xr make 1 .
Variable substitution supports
one level of nesting with the same delimiter.
.
.It Cm mdoc
The
.Xr mdoc 7
language.
.
.It Cm rust
The Rust 2018 language.
Nested raw strings and block comments
are not highlighted correctly.
.
.It Cm sh
The POSIX
.Xr sh 1
language.
Here-documents are correctly highlighted
only with a delimiter of
.Ql EOF .
Arbitrarily nested strings and command substitutions
are not highlighted correctly.
.
.It Cm text
Plain text.
.El