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#!/usr/bin/env nix-shell
#!nix-shell -i perl -p less moreutils nvi perl --pure -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixos-18.09.tar.gz

=head1 NAME

website pastebin - Create new pastebins from the org-mode template.

=head1 SYNOPSIS

website pastebin [options]

  Options:
    --help            Show the manpage.
    --title           Title of the pastebin.

=head1 OPTIONS

=over 4

=item B<-h, --help>

Prints the manual page and exits.

=item B<-t, --title>

The title of the pastebin. This string will be slugified and the output is used to create the pastebin file name. Special characters are simplified or discarded.

=back

=head1 DESCRIPTION

B<website pastebin> creates a pastebin org-mode text files, that are later processed to produce HTML to be deployed statically.

=cut

use strict;
use warnings;
use Getopt::Long qw(:config no_ignore_case bundling);
use Pod::Usage qw(pod2usage);
use Unicode::Normalize qw(NFKD);
use File::Basename qw(dirname);

my $help = 0;
my $title = '';
GetOptions(
  'help|h|?' => \$help,
  'title|t=s' => \$title
) or pod2usage(-verbose => 1, -exitval => 2);
pod2usage(
  -verbose => 2,
  -exitval => 0
) if $help;
pod2usage(
  -verbose => 1,
  -exitval => 2,
  -message => "Missing required --title argument."
) if !$title;

# Taken from:
# https://stackoverflow.com/a/4009519
sub slugify {
  my $input = shift;
  $input = NFKD($input);      # Normalize (decompose) the Unicode string
  $input =~ tr/\000-\177//cd; # Strip non-ASCII characters (>127)
  $input =~ s/[^\w\s-]//g;    # Remove all characters that are not word characters (includes _), spaces, or hyphens
  $input =~ s/^\s+|\s+$//g;   # Trim whitespace from both ends
  $input = lc($input);
  $input =~ s/[-\s]+/-/g;     # Replace all occurrences of spaces and hyphens with a single hyphen
  return $input;
}

our $dirname = dirname(__FILE__);
our $in = "$dirname/skeleton.org";
our $out;
my $date = `date +"%Y-%m-%d %A %H:%M"`;
chomp $date;
my %ENV = (title => $title, date => $date);

# Derived from both:
# https://unix.stackexchange.com/a/294836
# https://stackoverflow.com/a/47664214
sub envsubst {
  open(IN, '<'.$in) or die $!;
  open(OUT, '>'.$out) or die $!;
  while(<IN>) {
    $_ =~ s/\$([_a-zA-Z]+)/$ENV{$1}/g;
    print OUT $_;
  }
  close(IN);
  close(OUT);
}

my $slug = slugify($title);
$out = `realpath $dirname/../site/pastebin/$slug.org`;
chomp $out;

envsubst();

`cat $out | vipe | sponge $out`;

print "$out\n";