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+.Dd January 20, 2021
+.Dt HILEX 1
+.Os
+.
+.Sh NAME
+.Nm hilex
+.Nd syntax highlighter
+.
+.Sh SYNOPSIS
+.Nm
+.Op Fl t
+.Op Fl f Ar format
+.Op Fl l Ar lexer
+.Op Fl n Ar name
+.Op Fl o Ar opts
+.Op Ar file
+.
+.Sh DESCRIPTION
+The
+.Nm
+utility
+syntax highlights
+the contents of
+.Ar file
+or standard input
+and formats it on standard output.
+.
+.Pp
+The arguments are as follows:
+.Bl -tag -width "-f format"
+.It Fl f Ar format
+Set the output format.
+See
+.Sx Output Formats .
+The default format is
+.Cm ansi .
+.
+.It Fl l Ar lexer
+Set the input lexer.
+See
+.Sx Input Lexers .
+The default input lexer is inferred from
+.Ar name
+or the first line of input.
+.
+.It Fl n Ar name
+Set the name used to infer the input lexer.
+The default is the final component of
+.Ar file .
+.
+.It Fl o Ar opts
+Set output format options.
+.Ar opts
+is a comma-separated list of options.
+Options for each output format are documented in
+.Sx Output Formats .
+.
+.It Fl t
+Default to the
+.Cm text
+input lexer if one cannot be inferred.
+.El
+.
+.Ss Output Formats
+.Bl -tag -width Ds
+.It Cm ansi
+Output ANSI terminal control sequences.
+If standard output is a terminal
+and standard input is not being read,
+output is piped to
+.Ev PAGER
+with
+.Ev LESS=FRX
+if it is not already set.
+.
+.It Cm html
+Output HTML
+.Sy span
+elements
+with the following classes:
+.Pp
+.Bl -hang -width "\&Op" -compact
+.It Sy \&Op
+operators
+.It Sy \&Nu
+numbers
+.It Sy \&Ke
+keywords
+.It Sy \&Id
+identifiers
+.It Sy \&Ma
+macros
+.It Sy \&Co
+comments
+.It Sy \&St
+strings
+.It Sy \&Es
+character escapes
+.It Sy \&Fo
+format strings
+.It Sy \&Su
+variable substitutions
+.El
+.Pp
+The options are as follows:
+.Bl -tag -width "title=..."
+.It Cm document
+Output an HTML document containing a
+.Sy pre
+element.
+.It Cm inline
+Output inline style attributes
+rather than classes.
+.It Cm pre
+Wrap the output in a
+.Sy pre
+element with the class
+.Sy hilex .
+.It Cm style Ns = Ns Ar url
+With
+.Cm document ,
+use the external stylesheet
+.Ar url .
+If unset,
+default styles are included in a
+.Sy style
+element.
+.It Cm tab Ns = Ns Ar n
+With
+.Cm document ,
+.Cm inline
+or
+.Cm pre ,
+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 same as
+.Ar name .
+.El
+.
+.It Cm irc
+Output IRC formatting codes.
+The options are as follows:
+.Bl -tag -width "monospace"
+.It Cm monospace
+Use the IRCCloud monospace formatting code.
+.El
+.El
+.
+.Ss Input Lexers
+.Bl -tag -width Ds
+.It Cm c
+The C11 language,
+with minimal support for
+.Xr lex 1 ,
+.Xr yacc 1
+and Objective-C input.
+Inferred for
+.Pa *.[chlmy]
+files.
+.
+.It Cm make
+BSD
+.Xr make 1 .
+Inferred for
+.Pa Makefile ,
+.Pa *.mk
+and
+.Pa *.am
+files.
+.
+.It Cm mdoc
+The
+.Xr mdoc 7
+language.
+Inferred for
+.Pa *.[1-9]
+files
+and files starting with
+.Dq .Dd .
+.
+.It Cm sh
+POSIX
+.Xr sh 1 .
+Since lexical analysis of
+the shell command language
+is effectively impossible,
+this is best-effort only.
+Inferred for
+.Pa *.sh ,
+.Pa .profile ,
+.Pa .shrc
+files
+and files starting with
+.Dq #!/bin/sh .
+.
+.It Cm text
+Plain text.
+Inferred for
+.Pa *.txt
+files.
+.El
+.
+.Sh ENVIRONMENT
+.Bl -tag -width "PAGER"
+.It Ev PAGER
+The command to pipe ANSI output to
+if standard output is a terminal.
+The default is
+.Ev PAGER=less .
+.El