#!/usr/bin/perl

# Post-process the texinfo template to remove some entries which should not be
# translated.  Add translator notes to cross references.

use strict;
use warnings;
use Text::Wrap 'wrap';

*OUT = *STDOUT;
if (@ARGV and $ARGV[0] =~ /^-o(.*)/)
{
    shift;
    my $out = $1 || shift || die "$0: missing output file\n";
    open OUT, '>', $out or die "$0: can't open $out ($!)\n";
}

$/ = '';  # read paragraphs
while (<>)
{
    # Path name for dir entry.  Corrected by fixup-texi-trans.
    next if /^#\. type: menuentry/m
	and /^msgid "help2man: \(help2man\)"/m;

    # "Top" node is special to texinfo.
    next if /^#\. type: node/m
	and /^msgid "Top"/m;

    # Macro commands, and parameters.
    next if /^msgid "\@unmacro/m;
    next if /^msgid "\\\\text\\\\"/m;

    # Options.
    next if /^msgid "-[a-zA-Z]"/m;
    next if /^msgid "--[a-z-]+"/m;

    # Other untranslatable strings.
    next if /^#\. type: author/ and /^msgid "[^@]*\@email\{[^}]*\}"/m;
    next if /^msgid "help2man"/m;
    next if /^msgid "\@url\{[^}]*\}(\\n)?"/m;
    next if /^msgid "\@documentencoding UTF-8"/m;

    # Find cross references and add a note to translators.
    /^msgid "(.*)/sm or next;
    my @refs = $1 =~ /\@(?:p?x)?ref\{([^,}]*)\}/g;
    if (@refs)
    {
	for (@refs)
	{
	    s/"\n"//g;       # remove line breaks
	    $_ = qq/"$_",/;  # add quotes and comma
	}

	$refs[-1] =~ s/,$//;
	my $plural = '';
	if (@refs > 1)
	{
	    $plural = 's';
	    splice @refs, -1, 0, 'and';
	}

	my $note = wrap "#. Translators: ", "#. ",
	    "the translated cross-reference$plural @refs here must match the " .
	    " target (type: node) translation$plural elsewhere in this file.";
	$_ = $note . "\n" . $_;
    }

    print OUT;
}