#!/usr/pkg/bin/perl
package Perl::PrereqScanner::App 1.100;
# ABSTRACT: scan your working dir for likely prereqs

use strict;
use warnings;

use lib ();

use File::Find;
use List::Util qw{ max };
use Perl::PrereqScanner;
use CPAN::Meta::Requirements ();
use Scalar::Util qw(looks_like_number);

use Getopt::Long::Descriptive;

my ($opt, $usage) = describe_options(
  'scan-perl-prereqs %o [DIR|FILES]',
  [ 'pretty'   => 'format for human consumption, not toolchain' ],
  [ 'by-file'  => 'emit one stanza per file'  ],
  [ 'lib|I=s@' => 'specifies include paths, like perl\'s -I' ],

  [ 'version' => 'print usage message and exit' ],
  [ 'help'    => 'print version and exit' ],
);

lib->import(@{ $opt->lib }) if $opt->lib;

print('scan-perl-prereqs v' . (Perl::PrereqScanner->VERSION || 'DEV') . "\n")
  if $opt->version;
print($usage->text) if $opt->help;
exit if $opt->version or $opt->help;

foreach my $file ( @ARGV ? @ARGV : '.' ) {
    -d $file ? scan_dir( $file ) : scan_file( $file );
}

my %result;

sub scan_dir {
    find( {
        no_chdir => 1,
        wanted => sub { scan_file($_) if /\.(pl|PL|pm|cgi|psgi|t)$/ && -f $_ }
    }, shift );
}

sub scan_file {
    my $file = shift;

    my $key = $opt->by_file ? $file : '';
    $result{ $key } ||= CPAN::Meta::Requirements->new;

    $result{ $key }->add_requirements(
        Perl::PrereqScanner->new->scan_file($file)
    );
}

for my $file (sort keys %result) {
    print "## $file\n" if length $file and keys(%result) > 1;
    print_prereqs($result{$file});
}

sub print_prereqs {
    my $prereqs = shift->as_string_hash;

    if( $opt->pretty ) {
        my $max = max map { length } keys %$prereqs;
        printf( "%-${max}s = %s\n", $_, $prereqs->{$_} )
          for sort keys %$prereqs;
    } else {
        ### FIXME grossly insufficient filtering, should refactor/backport
        ### filtering from Dist::Zilla::Plugin::AutoPrereqs or something
        foreach ( sort keys %$prereqs ) {
            next if $_ eq 'perl';
            my $v = $prereqs->{$_} || 0;
            $v = qq{"$v"} unless looks_like_number($v);
            print($v eq '0' ? qq{$_\n} : qq{$_~$v\n});
        }
    }
}

exit;

#pod =head1 SYNOPSIS
#pod
#pod     scan-perl-prereqs [--by-file] [--pretty] [DIRS | FILES]
#pod
#pod Directories are traversed with L<File::Find> to collect all C<.pl>, C<.pm>,
#pod C<.psgi> and C<.t> files. If no directories or files are specified, the current
#pod working directory is scanned.
#pod
#pod The default is to print a single combined list suitable for piping to C<cpanm>
#pod or similar tools.
#pod
#pod The C<--by-file> switch will print results grouped by the files in which they
#pod were found.
#pod
#pod The C<--pretty> swith will print results in a more human-friendly format, with
#pod names and versions vertically aligned.
#pod
#pod =cut

__END__

=pod

=encoding UTF-8

=head1 NAME

Perl::PrereqScanner::App - scan your working dir for likely prereqs

=head1 VERSION

version 1.100

=head1 SYNOPSIS

    scan-perl-prereqs [--by-file] [--pretty] [DIRS | FILES]

Directories are traversed with L<File::Find> to collect all C<.pl>, C<.pm>,
C<.psgi> and C<.t> files. If no directories or files are specified, the current
working directory is scanned.

The default is to print a single combined list suitable for piping to C<cpanm>
or similar tools.

The C<--by-file> switch will print results grouped by the files in which they
were found.

The C<--pretty> swith will print results in a more human-friendly format, with
names and versions vertically aligned.

=head1 PERL VERSION

This library should run on perls released even a long time ago.  It should work
on any version of perl released in the last five years.

Although it may work on older versions of perl, no guarantee is made that the
minimum required version will not be increased.  The version may be increased
for any reason, and there is no promise that patches will be accepted to lower
the minimum required perl.

=head1 AUTHORS

=over 4

=item *

Jerome Quelin

=item *

Ricardo Signes <cpan@semiotic.systems>

=back

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2009 by Jerome Quelin.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut
