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+.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