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Filename : pod2readme
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#!/usr/bin/perl

use v5.10.1;

use strict;
use warnings;

use File::Copy qw/ copy /;
use Getopt::Long::Descriptive;
use IO::Handle;
use Pod::Readme;

our $VERSION = 'v1.2.3';

=head1 NAME

pod2readme - Intelligently generate a README file from POD

=head1 USAGE

    pod2readme [-cfho] [long options...] input-file [output-file] [target]

        Intelligently generate a README file from POD

        -t --target     target type (default: 'readme')
        -f --format     output format (default: 'text')
        -b --backup     backup output file
        -o --output     output filename (default based on target)
        -c --stdout     output to stdout (console)
        -F --force      only update if files are changed
        -h --help       print usage and exit

=head1 SYNOPSIS

    pod2readme -f markdown lib/MyApp.pm

=head1 DESCRIPTION

This utility will use L<Pod::Readme> to extract a F<README> file from
a POD document.

It works by extracting and filtering the POD, and then calling the
appropriate filter program to convert the POD to another format.

=head1 OPTIONS

=head2 C<--backup>

By default, C<pod2readme> will back up the output file. To disable
this, use the C<--no-backup> option.

=head2 C<--output>

Specifies the name of the output file. If omitted, it will use the
second command line argument, or default to the C<--target> plus the
corresponding extension of the C<--format>.

For all intents, the default is F<README>.

If a format other than "text" is chosen, then the appropriate
extension will be added, e.g. for "markdown", the default output file
is F<README.md>.

=head2 C<--target>

The target of the filter, which defaults to "readme".

=head2 C<--format>

The output format, which defaults to "text".

Other supposed formats are "github", "html", "latex", "man",
"markdown", "pod", "rtf", and "xhtml". You can also use "gfm"
instead of "github". Similary you can use "md" for "markdown".

=head2 C<--stdout>

If enabled, it will output to the console instead of C<--output>.

=head2 C<--force>

By default, the F<README> will be generated if the source files have
been changed.  Using C<--force> will force the file to be updated.

Note: POD format files will always be updated.

=head2 C<--help>

Prints the usage and exits.

=head1 SEE ALSO

L<pod2text>, L<pod2markdown>.

=cut

my %FORMATS = (
    'gfm'      => { class => 'Pod::Markdown::Github' },
    'github'   => { class => 'Pod::Markdown::Github' },
    'html'     => { class => 'Pod::Simple::HTML', },
    'latex'    => { class => 'Pod::Simple::LaTeX' },
    'man'      => { class => 'Pod::Man' },
    'markdown' => { class => 'Pod::Markdown' },
    'md'       => { class => 'Pod::Markdown' },
    'pod'      => { class => undef },
    'rtf'      => { class => 'Pod::Simple::RTF' },
    'text'     => { class => 'Pod::Simple::Text' },
    'xhtml'    => { class => 'Pod::Simple::XHTML' },
);

sub validate_format {
    my $value = shift;
    if ( exists $FORMATS{$value} ) {
        return $value;
    }
    else {
        die "Invalid format: '${value}'\n";
    }
}

my ( $opt, $usage ) = describe_options(
    '%c %o input-file [output-file] [target]',
    [],
    ['Intelligently generate a README file from POD'],
    [],
    [ 'target|t=s' => "target type (default: 'readme')" ],
    [
        'format|f=s' => "output format (default: 'text')",
        {
            default   => 'text',
            callbacks => { format => \&validate_format },
        }
    ],
    [ 'backup|b!' => "backup output file", { default => 1 } ],
    [ 'output|o' => "output filename (default based on target)" ],
    [ 'stdout|c' => "output to stdout (console)" ],
    [ 'force|F!' => "only update if files are changed" ],
    [ 'help|h'   => "print usage and exit" ],
);

die $usage if $opt->help;

my %args = ( force => $opt->force );

if ( my $input = shift @ARGV ) {
    $args{input_file} = $input;
}

my $format = $FORMATS{ $opt->format };
unless ($format) {
    say sprintf( "Unknown format: '\%s'", $opt->format );
    die $usage;
}

my $output = $opt->output || shift @ARGV;
my $target = $opt->target || shift @ARGV || 'readme';

$args{target} = $target;

if ( my $class = $format->{class} ) {
    $args{translation_class} = $class;
}

if ( $opt->stdout ) {
    my $fh = IO::Handle->new;
    if ( $fh->fdopen( fileno(STDOUT), 'w' ) ) {
        $args{translate_to_fh} = $fh;
    }
    else {
        die "Cannot get a filehandle for STDOUT";
    }
}
else {
    $args{translate_to_file} = $output if $output;
}

my $pr = Pod::Readme->new(%args);

$output ||= $pr->translate_to_file;

if ( $opt->backup && $output && -e $output ) {
    copy( $output, $output . '.bak' );
}

$pr->run();