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+#!/usr/bin/env ruby
+###
+### mdoc2man - mdoc to man converter
+###
+### Quick usage: mdoc2man.rb < mdoc_manpage.8 > man_manpage.8
+###
+### Ported from Perl by Akinori MUSHA.
+###
+### Copyright (c) 2001 University of Illinois Board of Trustees
+### Copyright (c) 2001 Mark D. Roth
+### Copyright (c) 2002, 2003 Akinori MUSHA
+### All rights reserved.
+###
+### Redistribution and use in source and binary forms, with or without
+### modification, are permitted provided that the following conditions
+### are met:
+### 1. Redistributions of source code must retain the above copyright
+### notice, this list of conditions and the following disclaimer.
+### 2. Redistributions in binary form must reproduce the above copyright
+### notice, this list of conditions and the following disclaimer in the
+### documentation and/or other materials provided with the distribution.
+### 3. All advertising materials mentioning features or use of this software
+### must display the following acknowledgement:
+### This product includes software developed by the University of
+### Illinois at Urbana, and their contributors.
+### 4. The University nor the names of their
+### contributors may be used to endorse or promote products derived from
+### this software without specific prior written permission.
+###
+### THIS SOFTWARE IS PROVIDED BY THE TRUSTEES AND CONTRIBUTORS ``AS IS'' AND
+### ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+### IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+### ARE DISCLAIMED. IN NO EVENT SHALL THE TRUSTEES OR CONTRIBUTORS BE LIABLE
+### FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+### DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+### OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+### HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+### LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+### OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+### SUCH DAMAGE.
+###
+### $Id$
+###
+
+$name = $date = $id = nil
+$refauthors = $reftitle = $refissue = $refdate = $refopt = nil
+
+$optlist = 0 ### 1 = bullet, 2 = enum, 3 = tag, 4 = item
+$oldoptlist = 0
+$nospace = 0 ### 0, 1, 2
+$enum = 0
+$synopsis = true
+$reference = false
+$ext = false
+$extopt = false
+$literal = false
+
+def parse_macro(line)
+ words = line.split
+ retval = ''
+
+ option = false
+ parens = false
+
+ while word = words.shift
+ case word
+ when 'Li', 'Pf'
+ next
+ when 'Xo'
+ $ext = true
+ retval << ' ' unless retval.empty? || /[\n ]\z/ =~ retval
+ next
+ when 'Xc'
+ $ext = false
+ retval << "\n" unless $extopt
+ break
+ when 'Bd'
+ $literal = true if words[0] == '-literal'
+ retval << "\n"
+ break
+ when 'Ed'
+ $literal = false
+ break
+ when 'Ns'
+ $nospace = 1 if $nospace == 0
+ retval.chomp!(' ')
+ next
+ when 'No'
+ retval.chomp!(' ')
+ retval << words.shift
+ next
+ when 'Dq'
+ retval << '``'
+ begin
+ retval << words.shift << ' '
+ end until words.empty? || /^[\.,]/ =~ words[0]
+ retval.chomp!(' ')
+ retval << '\'\''
+ $nospace = 1 if $nospace == 0 && /^[\.,]/ =~ words[0]
+ next
+ when 'Sq', 'Ql'
+ retval << '`' << words.shift << '\''
+ $nospace = 1 if $nospace == 0 && /^[\.,]/ =~ words[0]
+ next
+ # when 'Ic'
+ # retval << '\\fB' << words.shift << '\\fP'
+ # next
+ when 'Oo'
+ #retval << "[\\c\n"
+ $extopt = true
+ $nospace = 1 if $nospace == 0
+ retval << '['
+ next
+ when 'Oc'
+ $extopt = false
+ retval << ']'
+ next
+ end
+
+ retval << ' ' if $nospace == 0 && !(retval.empty? || /[\n ]\z/ =~ retval)
+ $nospace = 0 if $nospace == 1
+
+ case word
+ when 'Dd'
+ $date = words.join(' ')
+ return nil
+ when 'Dt'
+ $id = words.join(' ')
+ return nil
+ when 'Os'
+ retval << '.TH ' << $id << ' "' << $date << '" "' <<
+ words.join(' ') << '"'
+ break
+ when 'Sh'
+ retval << '.SH'
+ $synopsis = (words[0] == 'SYNOPSIS')
+ next
+ when 'Xr'
+ retval << '\\fB' << words.shift <<
+ '\\fP(' << words.shift << ')' << words.shift
+ break
+ when 'Rs'
+ $refauthors = []
+ $reftitle = ''
+ $refissue = ''
+ $refdate = ''
+ $refopt = ''
+ $reference = true
+ break
+ when 'Re'
+ retval << "\n"
+
+ # authors
+ while @refauthors.size > 1
+ retval << @refauthors.shift << ', '
+ end
+ retval << 'and ' unless retval.empty?
+ retval << @refauthors.shift
+
+ # title
+ retval << ', \\fI' << $reftitle << '\\fP'
+
+ # issue
+ retval << ', ' << $refissue unless $refissue.empty?
+
+ # date
+ retval << ', ' << $refdate unless $refdate.empty?
+
+ # optional info
+ retval << ', ' << $refopt unless $refopt.empty?
+
+ retval << ".\n"
+
+ $reference = false
+ break
+ end
+
+ if $reference
+ case word
+ when '%A'
+ @refauthors.unshift(words.join(' '))
+ break
+ when '%T'
+ $reftitle = words.join(' ')
+ $reftitle.sub!(/^"/, '')
+ $reftitle.sub!(/"$/, '')
+ break
+ when '%N'
+ $refissue = words.join(' ')
+ break
+ when '%D'
+ $refdate = words.join(' ')
+ break
+ when '%O'
+ $refopt = words.join(' ')
+ break
+ end
+ end
+
+ case word
+ when 'Nm'
+ name = words.empty? ? $name : words.shift
+ $name ||= name
+ retval << ".br\n" if $synopsis
+ retval << "\\fB" << name << "\\fP"
+ $nospace = 1 if $nospace == 0 && /^[\.,]/ =~ words[0]
+ next
+ when 'Nd'
+ retval << '\\-'
+ next
+ when 'Fl'
+ retval << '\\fB\\-' << words.shift << '\\fP'
+ $nospace = 1 if $nospace == 0 && /^[\.,]/ =~ words[0]
+ next
+ when 'Ar'
+ retval << '\\fI'
+ if words.empty?
+ retval << 'file ...\\fP'
+ else
+ retval << words.shift << '\\fP'
+ while words[0] == '|'
+ retval << ' ' << words.shift << ' \\fI' << words.shift << '\\fP'
+ end
+ $nospace = 1 if $nospace == 0 && /^[\.,]/ =~ words[0]
+ next
+ end
+ when 'Cm'
+ retval << '\\fB' << words.shift << '\\fP'
+ while /^[\.,:)]$/ =~ words[0]
+ retval << words.shift
+ end
+ next
+ when 'Op'
+ option = true
+ $nospace = 1 if $nospace == 0
+ retval << '['
+ # words.push(words.pop + ']')
+ next
+ when 'Pp'
+ retval << "\n"
+ next
+ when 'Ss'
+ retval << '.SS'
+ next
+ end
+
+ if word == 'Pa' && !option
+ retval << '\\fI'
+ retval << '\\&' if /^\./ =~ words[0]
+ retval << words.shift << '\\fP'
+ while /^[\.,:;)]$/ =~ words[0]
+ retval << words.shift
+ end
+ # $nospace = 1 if $nospace == 0 && /^[\.,]/ =~ words[0]
+ next
+ end
+
+ case word
+ when 'Dv'
+ retval << '.BR'
+ next
+ when 'Em', 'Ev'
+ retval << '.IR'
+ next
+ when 'Pq'
+ retval << '('
+ $nospace = 1
+ parens = true
+ next
+ when 'Sx', 'Sy'
+ retval << '.B ' << words.join(' ')
+ break
+ when 'Ic'
+ retval << '\\fB'
+ until words.empty? || /^[\.,]/ =~ words[0]
+ case words[0]
+ when 'Op'
+ words.shift
+ retval << '['
+ words.push(words.pop + ']')
+ next
+ when 'Ar'
+ words.shift
+ retval << '\\fI' << words.shift << '\\fP'
+ else
+ retval << words.shift
+ end
+
+ retval << ' ' if $nospace == 0
+ end
+
+ retval.chomp!(' ')
+ retval << '\\fP'
+ retval << words.shift unless words.empty?
+ break
+ when 'Bl'
+ $oldoptlist = $optlist
+
+ case words[0]
+ when '-bullet'
+ $optlist = 1
+ when '-enum'
+ $optlist = 2
+ $enum = 0
+ when '-tag'
+ $optlist = 3
+ when '-item'
+ $optlist = 4
+ end
+
+ break
+ when 'El'
+ $optlist = $oldoptlist
+ next
+ end
+
+ if $optlist != 0 && word == 'It'
+ case $optlist
+ when 1
+ # bullets
+ retval << '.IP \\(bu'
+ when 2
+ # enum
+ $enum += 1
+ retval << '.IP ' << $enum << '.'
+ when 3
+ # tags
+ retval << ".TP\n"
+ case words[0]
+ when 'Pa', 'Ev'
+ words.shift
+ retval << '.B'
+ end
+ when 4
+ # item
+ retval << ".IP\n"
+ end
+
+ next
+ end
+
+ case word
+ when 'Sm'
+ case words[0]
+ when 'off'
+ $nospace = 2
+ when 'on'
+ # retval << "\n"
+ $nospace = 0
+ end
+ words.shift
+ next
+ end
+
+ retval << word
+ end
+
+ return nil if retval == '.'
+
+ retval.sub!(/\A\.([^a-zA-Z])/, "\\1")
+ # retval.chomp!(' ')
+
+ retval << ')' if parens
+
+ retval << ']' if option
+
+ # retval << ' ' unless $nospace == 0 || retval.empty? || /\n\z/ =~ retval
+
+ retval << ' ' unless !$ext || $extopt || / $/ =~ retval
+
+ retval << "\n" unless $ext || $extopt || retval.empty? || /\n\z/ =~ retval
+
+ return retval
+end
+
+ARGF.each { |line|
+ if /^\./ !~ line
+ print line
+ print ".br\n" if $literal
+ next
+ end
+
+ line.slice!(0, 1)
+
+ next if /\\"/ =~ line
+
+ line = parse_macro(line) and print line
+}
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