#!/usr/bin/perl

use warnings;
use strict;

my @files = `find . -name \\*.hs | grep -v _darcs | grep -v '^./lib' | grep -v '^./test'`;
map { chomp } @files;
my $files = join " ", @files;

print "$files\n";


my @cand;
foreach (@ARGV) {
    my $fn = $_;
    print "---- $fn\n";
    open my $fh, "<$fn";
    my $data = join "",<$fh>;
    close $fh;
    $data =~ /module\s+[\w.]+\s*\((.*?)\)\s*where/s;
    my @matches;
    if (defined $1) {
        @matches = $1 =~ /[\w']+/g;
    } else {
        @matches = $data =~ /^[\w']+/gm;
    }
    next unless @matches;
    my %nub;
    $nub{$_}++ foreach @matches;
    foreach (keys %nub) {
        next if /^(import|data|type|module|class)$/;
        print "--- $_\n";
        next if /\'/;
        my @lines = `grep -l '\\<$_\\>' $files | grep -v '^./$fn\$'`;
        map { s/^\s*\.\///; chomp } @lines;
        print "$_\n" foreach @lines;
        push @cand,"$fn $_" unless @lines;
    }
}

print "\n\n--- candidates ---\n";
print "$_\n" foreach @cand;