#!/usr/bin/perl

use Getopt::Std;

# Usage: fixman [-f] postconf.proto filename.c >filename.c.new

# fixman - fix parameter text in embedded man pages

# Basic operation:
#
# - Read definitions fron postconf.proto like file
#
# - Read source file with embedded manual page
#
# - Write to stdout the updated source file.
#

#use Getopt::Std;

#$opt_h = undef;
#$opt_v = undef;
#getopts("hv");

#push @ARGV, "/dev/null"; # XXX

$opt_f = undef;
$opt_v = undef;
getopts("fv");

die "Usage: $0 [-fv] protofile [sourcefile...]
-f: include full parameter description instead of one-line summary
-v: verbose mode\n"
        unless $protofile = shift(@ARGV);

# Save one definition.

sub save_text 
{
    if ($category eq "PARAM") {
	$text =~ s/\.\s.*/.\n/s unless $opt_f;
        $param_text{$name} = $text;
	$defval = "empty" unless $defval ne "";
	$defval_text{$name} = $defval;
        if ($opt_v) {
            printf "saving entry %s %.20s..\n", $name, $text;
        } 
    } elsif ($category eq "CLASS") {
        $class_text{$name} = $text;
        if ($opt_v) {
            printf "saving class %s %.20s..\n", $name, $text;
        } 
    } else {
        die "Unknown category: $category. Need PARAM or CLASS.\n";
    }
}

# Emit one parameter name and text

sub emit_text
{
    my ($delim) = @_;
    if ($block = $param_text{$name}) {
	print "$delim .IP \"\\fB$name ($defval_text{$name})\\fR\"\n";
	$wantpp = 0;
	$block =~ s/<a [^>]*>//g;
	$block =~ s/<\/a>//g;
	$block =~ s/<b>/\\fB/g;
	$block =~ s/<i>/\\fI/g;
	$block =~ s/<\/b>/\\fR/g;
	$block =~ s/<\/i>/\\fR/g;
	$block =~ s/\n(<p(re)?>)/\n.sp\n\1/g ; # if ($wantpp);
	$block =~ s/^(<p(re)?>)/.sp\n\1/ ; # if ($wantpp);
	$block =~ s/<p> */\n/g;
	$block =~ s/<\/p>/\n/g;
	$block =~ s/<pre>/\n.nf\n.na\n.ft C\n/g;
	$block =~ s/<\/pre>/\n.fi\n.ad\n.ft R\n/g;
	$block =~ s/<dl[^>]*>/\n.RS\n/g;
	$block =~ s/<ul>/\n.RS\n/g;
	#$block =~ s/<\/dl>/\n.PP\n/g;
	#$block =~ s/<\/ul>/\n.PP\n/g;
	$block =~ s/<\/dl>/\n.RE\n.IP ""\n/g;
	$block =~ s/<\/ul>/\n.RE\n.IP ""\n/g;
	$block =~ s/<dd>/\n/g;
	$block =~ s/<\/dd>/\n/g;
	$block =~ s/<li>\s*/\n.IP \\(bu\n/g;
	$block =~ s/<dt>\s*/\n.IP "/g;
	$block =~ s/\s*<\/dt>/"/g;
	$block =~ s/<blockquote>/\n.na\n.nf\n.in +4\n/g;
	$block =~ s/<\/blockquote>/\n.in -4\n.fi\n.ad\n/g;
	$block =~ s/\n<br>/\n.br\n/g;
	$block =~ s/<br>\s*/\n.br\n/g;
	$block =~ s/&le;/<=/g;
	$block =~ s/&ge;/>=/g;
	$block =~ s/&lt;/</g;
	$block =~ s/&gt;/>/g;

	# Peep-hole optimizer.
	$block =~ s/^\s+//g;
	$block =~ s/\s+\n/\n/g;
	$block =~ s/^\n//g;
	$block =~ s/\.IP ""\n(\.sp\n)+/.IP ""\n/g;
	$block =~ s/\.IP ""\n(\.[A-Z][A-Z])/\1/g;
	$block =~ s/(.IP ""\n)+$//;
	$block =~ s/^(\.(PP|sp)\n)+//;
	#$wantpp = !($block =~ /^\.(SH|IP)/);

	# Boldify man page references.
	$block =~ s/([_a-zA-Z0-9-]+)(\([0-9]\))/\\fB\1\\fR\2/g;

	# Encapsulate as C code comment.
	$block =~ s/^([^.])/$delim\t\1/;
	$block =~ s/^\./$delim ./;
	$block =~ s/\n([^.])/\n$delim\t\1/g;
	$block =~ s/\n\./\n$delim ./g;

	print $block;
    } else {
	print "$delim .IP \"\\fB$name ($defval)\\fR\"\n";
	print $text;
    }
    $name = "";
}

# Read the whole file even if we want to print only one parameter.

open(POSTCONF, $protofile) || die " cannot open $protofile: $!\n";

while(<POSTCONF>) {

    next if /^#/;
    next unless ($name || /\S/);

    if (/^%(PARAM|CLASS)/) {

        # Save the accumulated text.

        if ($name && $text) {
            save_text();
        }

        # Reset the parameter name and accumulated text.

        $name = $text = "";
        $category = $1;

        # Accumulate the parameter name and default value.

        do {
            $text .= $_;
        } while(($_ = <POSTCONF>) && /\S/);
        ($junk, $name, $defval) = split(/\s+/, $text, 3);

	$defval =~ s/\s+/ /g;
	$defval =~ s/\s+$//;
	$defval =~ s/&le;/<=/g;
	$defval =~ s/&ge;/>=/g;
	$defval =~ s/&lt;/</g;
	$defval =~ s/&gt;/>/g;
	$defval =~ s/"/'/g;
	$text = "";
	next;
    } 

    # Accumulate the text in the class or parameter definition.

    $text .= $_;

}

# Save the last definition.

if ($name && $text) {
    save_text();
}

# Process source file with embedded text. For now, hard-coded for C & sh.

while(<>) {

    if (/^(\/\*|#)\+\+/) {
	$incomment = 1;
	$name = "";
	print;
	next;
    }

    if (/^(\/\*|#)--/) {
	emit_text($1) if ($name ne "");
	$incomment = 0;
	print;
	next;
    }

    if (!$incomment) {
	print;
	next;
    }

    if (/(\/\*|#) +CONFIGURATION +PARAM/) {
	$incomment = 2;
    }

    # Delete text after nested itemized list.
    if ($incomment == 2 && /^(\/\*|#) +\.IP ""/) {
	$text .= $_;
	while (<>) {
	    last if /^(\/\*|#) +([A-Z][A-Z][A-Z]+|\.[A-Z][A-Z])/;
	    $text .= $_;
	}
    }

    # Delete nested itemized list.
    if ($incomment == 2 && /^(\/\*|#) +\.RS/) {
	$text .= $_;
	$rsnest++;
	while (<>) {
	    $text .= $_;
	    $rsnest++ if /^(\/\*|#) +\.RS/;
	    $rsnest-- if /(\/\*|#) +\.RE/;
	    last if $rsnest == 0;
	}
	next;
    }

    if ($incomment == 2 && /^(\/\*|#) +\.IP +"?\\fB([a-zA-Z0-9_]+)( +\((.*)\))?/) {
	emit_text($1) if ($name ne "");
	$name = $2;
	$defval = $4;
	$text = "";
	next;
    }

    if ($incomment == 2 && /^(\/\*|#) +([A-Z][A-Z][A-Z]+|\.[A-Z][A-Z])/) {
	emit_text($1) if ($name ne "");
	$incomment = 0 if /^(\/\*|#) +(SEE +ALSO|README +FILES|LICENSE|AUTHOR)/;
	print;
	next;
    }

    if ($name ne "") {
	$text .= $_;
	next;
    }

    print;
    next;
}

die "Unterminated comment\n" if $incomment;