1#!/usr/bin/perl
2
3# postconf2man - convert postconf2html to nroff
4
5# Basic operation: 
6#
7# - Process input as blocks of text separated by one or more empty
8# (or all whitespace) lines. 
9#
10# - Process <nroffescape> pass-through requests for things that this
11# script cannot do automatically.
12#
13# Caution: this depends heavily on the postconf2html output format.
14
15#use Getopt::Std;
16
17#$opt_h = undef;
18#$opt_v = undef;
19#getopts("hv");
20
21#die "Usage: $0 [-hv]\n" if ($opt_h);
22
23#push @ARGV, "/dev/null"; # XXX
24
25while(<>) {
26
27    # Skip blank lines before text block.
28    next unless (/\S/);
29
30    # Gobble up the next text block.
31    $block = "";
32    do {
33	$_ =~ s/\s+\n$/\n/;
34	$block .= $_;
35    } while(($_ = <>) && /\S/);
36
37    # How the %!#$^@ do I get a backslash substituted into a string?
38    # Even \134 comes out as \e. What brain damage is this?
39    #$block =~ s/\n\./\n\\\&./g;
40    $block =~ s/\n\./\n\134\&./g;
41    $block =~ s/\n'/\n\134\&'/g;
42    if ($block =~ /<H2>/) {
43	$block =~ s/<H2><a[^>]+>([^<]+)<\/a><\/H2>/\n.SH \1\n/g;
44	$block =~ tr/a-z/A-Z/;
45    }
46    $block =~ s/<DT><b><a[^>]+>([^<]+)<\/a>\n(.*)<\/b><\/DT><DD>/\n.SH \1 \2\n/g;
47    $block =~ s/<[Aa][ \n]+[Hh][Rr][Ee][Ff]="[^"]+">//g;
48    $block =~ s/<[Aa][ \n]+[Nn][Aa][Mm][Ee]="[^"]+">//g;
49    $block =~ s/<\/[Aa]>//g;
50    $block =~ s/<\/DD>/\n/g;
51    $block =~ s/<DL>/\n/g;
52    $block =~ s/<\/DL>/\n/g;
53    $block =~ s/\\/\\e/g;
54    $block =~ s/<b>/\\fB/g;
55    $block =~ s/<i>/\\fI/g;
56    $block =~ s/<\/b>/\\fR/g;
57    $block =~ s/<\/i>/\\fR/g;
58    $block =~ s/^(<p(re)?>)/.PP\n\1/ if ($wantpp);
59    $block =~ s/<p> */\n/g;
60    $block =~ s/ *<\/p>/\n/g;
61    $block =~ s/<pre>/\n.nf\n.na\n.ft C\n/g;
62    $block =~ s/<\/pre>/\n.fi\n.ad\n.ft R\n/g;
63    $block =~ s/<dl[^>]*>/\n/g;
64    $block =~ s/<ul>/\n/g;
65    #$block =~ s/<\/dl>/\n.PP\n/g;
66    #$block =~ s/<\/ul>/\n.PP\n/g;
67    $block =~ s/<\/dl>/\n.br\n/g;
68    $block =~ s/<\/ul>/\n.br\n/g;
69    $block =~ s/<dd>\s*/\n/g;
70    $block =~ s/<\/dd>/\n.br\n/g;
71    $block =~ s/<li>\s*/\n.IP \\(bu\n/g;
72    $block =~ s/<dt>\s*/\n.IP "/g;
73    $block =~ s/\s*<\/dt>/"/g;
74    $block =~ s/<tt>\s*//g;
75    $block =~ s/\s*<\/tt>//g;
76    # Munge "-" here, so that we don't screw up ".in -4".
77    $block =~ s/-/\\-/g;
78    $block =~ s/<blockquote>/\n.sp\n.in +4\n/g;
79    $block =~ s/<\/blockquote>/\n.in -4\n/g;
80    $block =~ s/\n<br>\s*/\n.br\n/g;
81    $block =~ s/<br>\s*/\n.br\n/g;
82    $block =~ s/&le;/<=/g;
83    $block =~ s/&lt;/</g;
84    $block =~ s/&ge;/>=/g;
85    $block =~ s/&gt;/>/g;
86    $block =~ s/&amp;/\&/g;
87    $block =~ s/&ndash;/-/g;
88    $block =~ s/&mdash;/-/g;
89    $block =~ s/\s+\n/\n/g;
90    $block =~ s/^\n//g;
91    $block =~ s/\s*<\s*nroffescape\s+([^ >]+)\s*>\s*/\n\1\n/g;
92    $block =~ s/([A-Za-z][_a-zA-Z0-9-]*)(\([0-9]\))/\\fB\1\\fR\2/g;
93    print $block;
94    $wantpp = !($block =~ /^\.(SH|IP)/);
95}
96