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#!/usr/bin/perl

$/ = "";
$cutting = 1;

$CFont = 'CW';
if ($ARGV[0] =~ s/-fc(.*)//) {
    shift;
    $CFont = $1 || shift;
}

if (length($CFont) == 2) {
    $CFont_embed = "\\f($CFont";
} 
elsif (length($CFont) == 1) {
    $CFont_embed = "\\f$CFont";
} 
else {
    die "Roff font should be 1 or 2 chars, not `$CFont_embed'";
} 

$name = @ARGV ? $ARGV[0] : "something";
$name =~ s/\..*//;

print <<"END";
.rn '' }`
''' \$RCSfile\$\$Revision\$\$Date\$
''' 
''' \$Log\$
''' 
.de Sh
.br
.if t .Sp
.ne 5
.PP
\\fB\\\\\$1\\fR
.PP
..
.de Sp
.if t .sp .5v
.if n .sp
..
.de Ip
.br
.ie \\\\n(.\$>=3 .ne \\\\\$3
.el .ne 3
.IP "\\\\\$1" \\\\\$2
..
.de Vb
.ft $CFont
.nf
.ne \\\\\$1
..
.de Ve
.ft R

.fi
..
'''
'''
'''     Set up \\*(-- to give an unbreakable dash;
'''     string Tr holds user defined translation string.
'''     Bell System Logo is used as a dummy character.
'''
.tr \\(*W-|\\(bv\\*(Tr
.ie n \\{\\
.ds -- \\(*W-
.if (\\n(.H=4u)&(1m=24u) .ds -- \\(*W\\h'-12u'\\(*W\\h'-12u'-\\" diablo 10 pitch
.if (\\n(.H=4u)&(1m=20u) .ds -- \\(*W\\h'-12u'\\(*W\\h'-8u'-\\" diablo 12 pitch
.ds L" ""
.ds R" ""
.ds L' '
.ds R' '
'br\\}
.el\\{\\
.ds -- \\(em\\|
.tr \\*(Tr
.ds L" ``
.ds R" ''
.ds L' `
.ds R' '
.if t .ds PI \\(*p
.if n .ds PI PI
'br\\}
.TH \U$name\E 1 "\\*(RP"
.UC
END

print <<'END';
.if n .hy 0 
.if n .na
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
.de CQ          \" put $1 in typewriter font
END
print ".ft $CFont\n";
print <<'END';
'if n "\c
'if t \\\\&\\\\$1\c
'if n \\\\&\\\\$1\c
'if n \&"
\\\\&\\\\$2 \\\\$3 \\\\$4 \\\\$5 \\\\$6 \\\\$7
'.ft R
..
.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
.	\" AM - accent mark definitions
.bd S B 3
.	\" fudge factors for nroff and troff
.if n \{\
.	ds #H 0
.	ds #V .8m
.	ds #F .3m
.	ds #[ \f1
.	ds #] \fP
.\}
.if t \{\
.	ds #H ((1u-(\\\\\\\\n(.fu%2u))*.13m)
.	ds #V .6m
.	ds #F 0
.	ds #[ \&
.	ds #] \&
.\}
.	\" simple accents for nroff and troff
.if n \{\
.	ds ' \&
.	ds ` \&
.	ds ^ \&
.	ds , \&
.	ds ~ ~
.	ds ? ?
.	ds ! !
.	ds / 
.	ds q 
.\}
.if t \{\
.	ds ' \\\\k:\h'-(\\\\n(.wu*8/10-\*(#H)'\'\h"|\\\\n:u"
.	ds ` \\\\k:\h'-(\\\\n(.wu*8/10-\*(#H)'\`\h'|\\\\n:u'
.	ds ^ \\\\k:\h'-(\\\\n(.wu*10/11-\*(#H)'^\h'|\\\\n:u'
.	ds , \\\\k:\h'-(\\\\n(.wu*8/10)',\h'|\\\\n:u'
.	ds ~ \\\\k:\h'-(\\\\n(.wu-\*(#H-.1m)'~\h'|\\\\n:u'
.	ds ? \s-2c\h'-\w'c'u*7/10'\u\h'\*(#H'\zi\d\s+2\h'\w'c'u*8/10'
.	ds ! \s-2\(or\s+2\h'-\w'\(or'u'\v'-.8m'.\v'.8m'
.	ds / \\\\k:\h'-(\\\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\\\n:u'
.	ds q o\h'-\w'o'u*8/10'\s-4\v'.4m'\z\(*i\v'-.4m'\s+4\h'\w'o'u*8/10'
.\}
.	\" troff and (daisy-wheel) nroff accents
.ds : \\\\k:\h'-(\\\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\\\n:u'\v'\*(#V'
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
.ds v \\\\k:\h'-(\\\\n(.wu*9/10-\*(#H)'\v'-\*(#V'\*(#[\s-4v\s0\v'\*(#V'\h'|\\\\n:u'\*(#]
.ds _ \\\\k:\h'-(\\\\n(.wu*9/10-\*(#H+(\*(#F*2/3))'\v'-.4m'\z\(hy\v'.4m'\h'|\\\\n:u'
.ds . \\\\k:\h'-(\\\\n(.wu*8/10)'\v'\*(#V*4/10'\z.\v'-\*(#V*4/10'\h'|\\\\n:u'
.ds 3 \*(#[\v'.2m'\s-2\&3\s0\v'-.2m'\*(#]
.ds o \\\\k:\h'-(\\\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\\\n:u'\*(#]
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
.ds D- D\\\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\\\n:u'
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
.ds ae a\h'-(\w'a'u*4/10)'e
.ds Ae A\h'-(\w'A'u*4/10)'E
.ds oe o\h'-(\w'o'u*4/10)'e
.ds Oe O\h'-(\w'O'u*4/10)'E
.	\" corrections for vroff
.if v .ds ~ \\\\k:\h'-(\\\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\\\n:u'
.if v .ds ^ \\\\k:\h'-(\\\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\\\n:u'
.	\" for low resolution devices (crt and lpr)
.if \n(.H>23 .if \n(.V>19 \
\{\
.	ds : e
.	ds 8 ss
.	ds v \h'-1'\o'\(aa\(ga'
.	ds _ \h'-1'^
.	ds . \h'-1'.
.	ds 3 3
.	ds o a
.	ds d- d\h'-1'\(ga
.	ds D- D\h'-1'\(hy
.	ds th \o'bp'
.	ds Th \o'LP'
.	ds ae ae
.	ds Ae AE
.	ds oe oe
.	ds Oe OE
.\}
.rm #[ #] #H #V #F C
END

$indent = 0;

while (<>) {
    if ($cutting) {
	next unless /^=/;
	$cutting = 0;
    }
    chomp;

    # Translate verbatim paragraph

    if (/^\s/) {
	@lines = split(/\n/);
	for (@lines) {
	    1 while s
		{^( [^\t]* ) \t ( \t* ) }
		{ $1 . ' ' x (8 - (length($1)%8) + 8 * (length($2))) }ex;
	    s/\\/\\e/g;
	    s/\A/\\&/s;
	}
	$lines = @lines;
	makespace() unless $verbatim++;
	print ".Vb $lines\n";
	print join("\n", @lines), "\n";
	print ".Ve\n";
	$needspace = 0;
	next;
    }

    $verbatim = 0;

    # check for things that'll hosed our noremap scheme; affects $_
    init_noremap();

    if (!/^=item/) {

	# trofficate backslashes; must do it before what happens below
	s/\\/noremap('\\e')/ge;

	# first hide the escapes in case we need to 
	# intuit something and get it wrong due to fmting

	s/([A-Z]<[^<>]*>)/noremap($1)/ge;

	# func() is a reference to a perl function
	s{
	    \b
	    (
		[:\w]+ \(\)
	    )
	} {I<$1>}gx;

	# func(n) is a reference to a man page
	s{
	    (\w+)
	    (
		\(
		    [^\s,\051]+
		\)
	    )
	} {I<$1>\\|$2}gx;

	# convert simple variable references
	s/([\$\@%][\w:]+)/C<$1>/g;

	if (m{ (
		    [\-\w]+
		    \(
			[^\051]*?
			[\@\$,]
			[^\051]*?
		    \)
		)
	    }x && $` !~ /([LCI]<[^<>]*|-)$/ && !/^=\w/) 
	{
	    warn "``$1'' should be a [LCI]<$1> ref";
	} 

	while (/(-[a-zA-Z])\b/g && $` !~ /[\w\-]$/) {
	    warn "``$1'' should be [CB]<$1> ref";
	} 

	# put it back so we get the <> processed again;
	clear_noremap(0); # 0 means leave the E's

    } else {
	# trofficate backslashes
	s/\\/noremap('\\e')/ge;

    } 

    # need to hide E<> first; they're processed in clear_noremap
    s/(E<[^<>]+>)/noremap($1)/ge;


    $maxnest = 10;
    while ($maxnest-- && /[A-Z]</) {

	# can't do C font here
	s/([BI])<([^<>]*)>/font($1) . $2 . font('R')/eg;

	# files and filelike refs in italics
	s/F<([^<>]*)>/I<$1>/g;

	# no break -- usually we want C<> for this
	s/S<([^<>]*)>/nobreak($1)/eg;

	# LREF: a manpage(3f) 
	s:L<([a-zA-Z][^\s\/]+)(\([^\)]+\))?>:the I<$1>$2 manpage:g;

	# LREF: an =item on another manpage
	s{
	    L<
		([^/]+)
		/
		(
		    [:\w]+
		    (\(\))?
		)
	    >
	} {the C<$2> entry in the I<$1> manpage}gx;

	# LREF: an =item on this manpage
	s{
	   ((?:
	    L<
		/
		(
		    [:\w]+
		    (\(\))?
		)
	    >
	    (,?\s+(and\s+)?)?
	  )+)
	} { internal_lrefs($1) }gex;

	# LREF: a =head2 (head1?), maybe on a manpage, maybe right here
	# the "func" can disambiguate
	s{
	    L<
		(?:
		    ([a-zA-Z]\S+?) / 
		)?
		"?(.*?)"?
	    >
	}{
	    do {
		$1 	# if no $1, assume it means on this page.
		    ?  "the section on I<$2> in the I<$1> manpage"
		    :  "the section on I<$2>"
	    } 
	}gex;

	s/Z<>/\\&/g;

	# comes last because not subject to reprocessing
	s/C<([^<>]*)>/noremap("${CFont_embed}${1}\\fR")/eg;
    }

    if (s/^=//) {
	$needspace = 0;		# Assume this.

	s/\n/ /g;

	($Cmd, $_) = split(' ', $_, 2);

	if (defined $_) {
	    &escapes;
	    s/"/""/g;
	}

	clear_noremap(1);

	if ($Cmd eq 'cut') {
	    $cutting = 1;
	}
	elsif ($Cmd eq 'head1') {
	    print qq{.SH "$_"\n}
	}
	elsif ($Cmd eq 'head2') {
	    print qq{.Sh "$_"\n}
	}
	elsif ($Cmd eq 'over') {
	    push(@indent,$indent);
	    $indent = $_ + 0;
	}
	elsif ($Cmd eq 'back') {
	    $indent = pop(@indent);
	    warn "Unmatched =back\n" unless defined $indent;
	    $needspace = 1;
	}
	elsif ($Cmd eq 'item') {
	    s/^\*( |$)/\\(bu$1/g;
	    print STDOUT qq{.Ip "$_" $indent\n};
	}
	else {
	    warn "Unrecognized directive: $Cmd\n";
	}
    }
    else {
	if ($needspace) {
	    &makespace;
	}
	&escapes;
	clear_noremap(1);
	print $_, "\n";
	$needspace = 1;
    }
}

print <<"END";

.rn }` ''
END

#########################################################################

sub nobreak {
    my $string = shift;
    $string =~ s/ /\\ /g;
    $string;
}

sub escapes {

    # translate the minus in foo-bar into foo\-bar for roff
    s/([^0-9a-z-])-([^-])/$1\\-$2/g;

    # make -- into the string version \*(-- (defined above)
    s/\b--\b/\\*(--/g;
    s/"--([^"])/"\\*(--$1/g;  # should be a better way
    s/([^"])--"/$1\\*(--"/g;

    # fix up quotes; this is somewhat tricky
    if (!/""/) {
	s/(^|\s)(['"])/noremap("$1\\*(L$2")/ge;
	s/(['"])($|[\-\s,;\\!?.])/noremap("\\*(R$1$2")/ge;
    }

    #s/(?!")(?:.)--(?!")(?:.)/\\*(--/g;
    #s/(?:(?!")(?:.)--(?:"))|(?:(?:")--(?!")(?:.))/\\*(--/g;
    

    # make sure that func() keeps a bit a space tween the parens
    ### s/\b\(\)/\\|()/g;
    ### s/\b\(\)/(\\|)/g;

    # make C++ into \*C+, which is a squinched version (defined above)
    s/\bC\+\+/\\*(C+/g;

    # make double underbars have a little tiny space between them
    s/__/_\\|_/g;

    # PI goes to \*(-- (defined above)
    s/\bPI\b/noremap('\\*(PI')/ge;

    # make all caps a teeny bit smaller, but don't muck with embedded code literals
    my $hidCFont = font('C');
    if ($Cmd !~ /^head1/) { # SH already makes smaller
	# /g isn't enough; 1 while or we'll be off

#	1 while s{
#	    (?!$hidCFont)(..|^.|^)
#	    \b
#	    (
#		[A-Z][\/A-Z+:\-\d_$.]+
#	    )
#	    (s?) 		
#	    \b
#	} {$1\\s-1$2\\s0}gmox;

	1 while s{
	    (?!$hidCFont)(..|^.|^)
	    (
		\b[A-Z]{2,}[\/A-Z+:\-\d_\$]*\b
	    )
	} { 
	    $1 . noremap( '\\s-1' .  $2 . '\\s0' )
	}egmox;

    }
}

# make troff just be normal, but make small nroff get quoted
# decided to just put the quotes in the text; sigh;
sub ccvt {
     local($_,$prev) = @_;
     if ( /^\W+$/ && !/^\$./ ) {
 	($prev && "\n") . noremap(qq{.CQ $_ \n\\&});
 	# what about $" ?
     } else {
 	noremap(qq{${CFont_embed}$_\\fR});
     } 
    noremap(qq{.CQ "$_" \n\\&});
} 

sub makespace {
    if ($indent) {
	print ".Sp\n";
    }
    else {
	print ".PP\n";
    }
}

sub font {
    local($font) = shift;
    return '\\f' . noremap($font);
} 

sub noremap {
    local($thing_to_hide) = shift;
    $thing_to_hide =~ tr/\000-\177/\200-\377/;
    return $thing_to_hide;
} 

sub init_noremap {
    if ( /[\200-\377]/ ) {
	warn "hit bit char in input stream";
    } 
} 

sub clear_noremap {
    my $ready_to_print = $_[0];

    tr/\200-\377/\000-\177/;

    # trofficate backslashes
    # s/(?!\\e)(?:..|^.|^)\\/\\e/g;

    # now for the E<>s, which have been hidden until now
    # otherwise the interative \w<> processing would have
    # been hosed by the E<gt>
    s {
	    E<	
	    ( [A-Za-z]+ )	
	    >	
    } { 
	 do {	
	     exists $HTML_Escapes{$1}
		? do { $HTML_Escapes{$1} }
		: do {
		    warn "Unknown escape: $& in $_";
		    "E<$1>";
		} 
	 } 
    }egx if $ready_to_print;
} 

sub internal_lrefs {
    local($_) = shift;

    s{L</([^>]+)>}{$1}g;
    my(@items) = split( /(?:,?\s+(?:and\s+)?)/ );
    my $retstr = "the ";
    my $i;
    for ($i = 0; $i <= $#items; $i++) {
	$retstr .= "C<$items[$i]>";
	$retstr .= ", " if @items > 2 && $i != $#items;
	$retstr .= " and " if $i+2 == @items;
    } 

    $retstr .= " entr" . ( @items > 1  ? "ies" : "y" )
	    .  " elsewhere in this document";

    return $retstr;

} 

BEGIN {
%HTML_Escapes = (
    'amp'	=>	'&',	#   ampersand
    'lt'	=>	'<',	#   left chevron, less-than
    'gt'	=>	'>',	#   right chevron, greater-than
    'quot'	=>	'"',	#   double quote

    "Aacute"	=>	"A\\*'",	#   capital A, acute accent
    "aacute"	=>	"a\\*'",	#   small a, acute accent
    "Acirc"	=>	"A\\*^",	#   capital A, circumflex accent
    "acirc"	=>	"a\\*^",	#   small a, circumflex accent
    "AElig"	=>	'\*(AE',	#   capital AE diphthong (ligature)
    "aelig"	=>	'\*(ae',	#   small ae diphthong (ligature)
    "Agrave"	=>	"A\\*`",	#   capital A, grave accent
    "agrave"	=>	"A\\*`",	#   small a, grave accent
    "Aring"	=>	'A\\*o',	#   capital A, ring
    "aring"	=>	'a\\*o',	#   small a, ring
    "Atilde"	=>	'A\\*~',	#   capital A, tilde
    "atilde"	=>	'a\\*~',	#   small a, tilde
    "Auml"	=>	'A\\*:',	#   capital A, dieresis or umlaut mark
    "auml"	=>	'a\\*:',	#   small a, dieresis or umlaut mark
    "Ccedil"	=>	'C\\*,',	#   capital C, cedilla
    "ccedil"	=>	'c\\*,',	#   small c, cedilla
    "Eacute"	=>	"E\\*'",	#   capital E, acute accent
    "eacute"	=>	"e\\*'",	#   small e, acute accent
    "Ecirc"	=>	"E\\*^",	#   capital E, circumflex accent
    "ecirc"	=>	"e\\*^",	#   small e, circumflex accent
    "Egrave"	=>	"E\\*`",	#   capital E, grave accent
    "egrave"	=>	"e\\*`",	#   small e, grave accent
    "ETH"	=>	'\\*(D-',	#   capital Eth, Icelandic
    "eth"	=>	'\\*(d-',	#   small eth, Icelandic
    "Euml"	=>	"E\\*:",	#   capital E, dieresis or umlaut mark
    "euml"	=>	"e\\*:",	#   small e, dieresis or umlaut mark
    "Iacute"	=>	"I\\*'",	#   capital I, acute accent
    "iacute"	=>	"i\\*'",	#   small i, acute accent
    "Icirc"	=>	"I\\*^",	#   capital I, circumflex accent
    "icirc"	=>	"i\\*^",	#   small i, circumflex accent
    "Igrave"	=>	"I\\*`",	#   capital I, grave accent
    "igrave"	=>	"i\\*`",	#   small i, grave accent
    "Iuml"	=>	"I\\*:",	#   capital I, dieresis or umlaut mark
    "iuml"	=>	"i\\*:",	#   small i, dieresis or umlaut mark
    "Ntilde"	=>	'N\*~',		#   capital N, tilde
    "ntilde"	=>	'n\*~',		#   small n, tilde
    "Oacute"	=>	"O\\*'",	#   capital O, acute accent
    "oacute"	=>	"o\\*'",	#   small o, acute accent
    "Ocirc"	=>	"O\\*^",	#   capital O, circumflex accent
    "ocirc"	=>	"o\\*^",	#   small o, circumflex accent
    "Ograve"	=>	"O\\*`",	#   capital O, grave accent
    "ograve"	=>	"o\\*`",	#   small o, grave accent
    "Oslash"	=>	"O\\*/",	#   capital O, slash
    "oslash"	=>	"o\\*/",	#   small o, slash
    "Otilde"	=>	"O\\*~",	#   capital O, tilde
    "otilde"	=>	"o\\*~",	#   small o, tilde
    "Ouml"	=>	"O\\*:",	#   capital O, dieresis or umlaut mark
    "ouml"	=>	"o\\*:",	#   small o, dieresis or umlaut mark
    "szlig"	=>	'\*8',		#   small sharp s, German (sz ligature)
    "THORN"	=>	'\\*(Th',	#   capital THORN, Icelandic
    "thorn"	=>	'\\*(th',,	#   small thorn, Icelandic
    "Uacute"	=>	"U\\*'",	#   capital U, acute accent
    "uacute"	=>	"u\\*'",	#   small u, acute accent
    "Ucirc"	=>	"U\\*^",	#   capital U, circumflex accent
    "ucirc"	=>	"u\\*^",	#   small u, circumflex accent
    "Ugrave"	=>	"U\\*`",	#   capital U, grave accent
    "ugrave"	=>	"u\\*`",	#   small u, grave accent
    "Uuml"	=>	"U\\*:",	#   capital U, dieresis or umlaut mark
    "uuml"	=>	"u\\*:",	#   small u, dieresis or umlaut mark
    "Yacute"	=>	"Y\\*'",	#   capital Y, acute accent
    "yacute"	=>	"y\\*'",	#   small y, acute accent
    "yuml"	=>	"y\\*:",	#   small y, dieresis or umlaut mark
);
}