#!/usr/bin/perl

$srcdir = $ARGV[0];

open(OUT, ">prog.sgml") || die "Cannot create output file";
include("doc/prog-head.sgml");
process("");
include("doc/prog-foot.sgml");
close OUT;
exit 0;

sub include {
  my $f = shift @_;
  open(IN, "$srcdir/$f") || die "Unable to find $f";
  while (<IN>) {
    print OUT;
  }
  close IN;
}

sub process {
  my $dir = shift @_;
  print "$dir/progdoc\n";
  open(IN, "$srcdir/$dir/progdoc") || die "Unable to read $dir/progdoc";
  my @docfile = <IN>;
  close IN;
  foreach $_ (@docfile) {
    chomp;
    /^#/ && next;
    /^([A-Z]+)\s*(.*)/ || die "Parse error: $_";
    $cmd = $1;
    $arg = $2;
    if ($cmd eq "C") { process("$dir/$arg"); }
    elsif ($cmd eq "H") {
      push @stack, "H";
      print OUT "<chapt>$arg\n";
    } elsif ($cmd eq "S") {
      print "    $arg\n";
      open(DOC, "cd $srcdir/$dir ; $srcdir/doc/kernel-doc -bird $arg |") || die "Unable to start kernel-doc";
      while (<DOC>) { print OUT; }
      close DOC;
    } elsif ($cmd eq "D") {
      print "    $arg\n";
      include("$dir/$arg");
    } else { die "Unknown command: $cmd"; }
  }
}