use 5.18.0;
use File::Slurp;
use File::Find ; 
use Cwd ; 

my $topDir = "/Users/Henry/Documents/WACS/en_ulb";

my %found;
my @filesToRun = ();
my $filePattern = '*.usfm' ; 


open LOG, ">/Users/Henry/Google Drive/WA/Scripts/out/log.log" or die;
open OUT, ">/Users/Henry/Google Drive/WA/Scripts/out/output.txt" or die;

find( sub { push @filesToRun, $File::Find::name if ( m/^(.*)$filePattern$/ ) }, $topDir) ;

foreach  my $file ( @filesToRun  ) 
{
    print "$file\n" ;
	my $fileText = read_file("$file", binmode => 'utf8');
	$fileText =~ s/\n/ /g;
	while ($fileText =~ /(\\[^ ]*) /g) {
		my $code = $1;
		unless (exists $found{$code}) {
			$found{$code} = $code
		}
	}
} 	

foreach my $code (sort keys %found) {
	say OUT $code
}

close OUT;
close LOG;

print "\n\tDone."