summaryrefslogtreecommitdiff
path: root/scripts/gen-FAQ.pl
blob: 9503903f8ca022d35a67579b3dab476b844ebddb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
#! /usr/bin/perl

=pod
This is a silly little program for generating the libc FAQ.

The input format is:
top boilerplate
^L
? section name (one line)
?? question...
...
{ID} answer...
...
^L
{ID} name <email@address>
...

which gets mapped to:

top boilerplate
^L
1. section 1...
1.1. q1.1
1.2. q1.2
...
^L
1. section 1...

1.1. q1.1

answer 1.1....


^L
Answers were provided by:
...

=cut

# We slurp the whole file into a pair of assoc arrays indexed by
# the 'section.question' number.
%questions = ();
%answers = ();
$question = 0;

# These arrays and counter keep track of the sections.
@sectcount = ();
@sections = ();
$section = 0;

# Cross reference list.
%refs = ();

# Separators.
$sepmaj = "\f\n" . ('~ ' x 36) . "\n\n";
$sepmin = "\f\n" . ('. ' x 36) . "\n\n";

# Pass through the top boilerplate.
while(<>)
{
    last if $_ eq "\f\n";
    print;
}

# Now the body.
while(<>)
{
    /\f/ && do
    {
	$sectcount[$section] = $question;
	last;
    };

    s/^\?\s+// && do
    {
	chomp;
	$sectcount[$section] = $question if $section > 0;
	$section++;
	$sections[$section] = $_;
	$question = 0;
	next;
    };
    s/^\?\?(\w*?)\s+// && do
    {
	$cur = \%questions;
	$question++;
	$questions{$section,$question} = $_;
	$refs{$1} = "$section.$question" if $1 ne "";
	next;
    };
    /^\{/ && do
    {
	$cur = \%answers;
	$answers{$section,$question} .= $_;
	next;
    };

    ${$cur}{$section,$question} .= $_;
}

# Now we have to clean up the newlines and deal with cross references.
foreach(keys %questions) { $questions{$_} =~ s/\n+$//; }
foreach(keys %answers)
{
    $answers{$_} =~ s/\n+$//;
    $answers{$_} =~ s/(\s)\?(\w+)\b/$1 . "question " . ($refs{$2} or badref($2,$_), "!!$2")/eg;
}

# Now output the formatted FAQ.
print $sepmaj;
for($i = 1; $i <= $section; $i++)
{
    print "$i. $sections[$i]\n\n";
    for($j = 1; $j <= $sectcount[$i]; $j++)
    {
	print "$i.$j.\t$questions{$i,$j}\n";
    }
    print "\n";
}

print $sepmaj;
for($i = 1; $i <= $section; $i++)
{
    print "$i. $sections[$i]\n\n";
    for($j = 1; $j <= $sectcount[$i]; $j++)
    {
	print "$i.$j.\t$questions{$i,$j}\n\n";
	print $answers{$i,$j}, "\n\n";
	print "\n" if $j < $sectcount[$i];
    }
    print $sepmin if $i < $section;
}

print $sepmaj;

# Pass through the trailer.
while(<>) { print; }

sub badref
{
    my($ref,$quest) = @_;
    $quest =~ s/$;/./;
    print STDERR "Undefined reference to $ref in answer to Q$quest\n";
}