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#!/usr/bin/perl -w

# Run gather_features -a if you want "A pigsty" rather than "pigsty".
my $art = grep /^-a$/, @ARGV;

sub articled($)
{
    local $_ = $_[0];
    return $_ unless $art;
    return $_ if /^[A-Z]/ && !/ trap$/;
    return "\u$_" if /^(?:the |an |a |some )/i;
    return "A $_" if /^one-/i;
    # Handle "rough-hewn floor" but not "escape hatch in the floor"
    return "The $_" if $_ =~ /^(\S+\s+)?floor$/;
    return /^[aeiou]/i ? "An $_" : "A $_";
}

open IN, "util/cpp_version directn.cc|" or die "Can't read directn.cc\n";
{ undef local $/; $_ = <IN>; }
close IN;

s/.*_base_feature_desc\(dungeon_feature_type(.*?)\n}\n.*/$1/s
    or die "Can't find _base_feature_desc in directn.cc\n";
s|//.*$||mg;

for (/"([^"\n]*)"/g)
{
    next if /^$/;
    next if /^undefined trap$/;
    next if /^Error/;

    $features{articled($_)} = 1;
}

open IN, "util/cpp_version describe.cc|" or die "Can't read directn.cc\n";
{ undef local $/; $_ = <IN>; }
close IN;

s/.*trap_names\[\] =(.*?)\n};\n.*/$1/s
    or die "Can't find trap_names in describe.cc\n";
s|//.*$||mg;

for (/"([^"\n]*)"/g)
{
    $_ .= " trap" unless /^(web|shaft|passage|pressure plate)$/;
    $_ .= " of Golubria" if /^passage$/;

    $features{articled($_)} = 1;
}

for (grep /\.des|\.des\.disabled|\.lua$/, `git ls-files`)
{
    chomp;
    open IN, "<", $_ or die "Can't read $_\n";
    { undef local $/; $_ = <IN>; }
    close IN;

    $features{articled($_)} = 1
        for /set_feature_name\s*\(\s*"[^"\n"]+"\s*,[ \n:]*"([^"\n]+)"\s*\)/sg;

    $features{articled($_)} = 1
        for /\bdesc\s*=\s*"([^"]*)"/g;
}

$features{articled("gleaming silver wall")} = 1;
for (qw(open closed runed sealed))
{
    $features{articled("large $_ door")} = 1;
    $features{articled("$_ gate")} = 1;
    $features{articled("huge $_ gate")} = 1;
}

print join("\n", sort keys %features), "\n";