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-rwxr-xr-xgen-FAQ.pl144
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+#! /usr/local/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";
+}