Blue Tiger is an assistant for Perl 5 to Perl 6 translation.

How to try it without installing:
    git clone git://github.com/Util/Blue_Tiger.git
    cd Blue_Tiger
    bin/p526 path/to/program.pl > program_and_warnings.p6

Initial Author: Bruce Gray
    Email:  bruce dot gray at acm dot org
    IRC:    "Util" on freenode/#perl6

Pre-requisite modules:
    PPI 1.204_03 or higher

Currently handles (with examples):
  Mandatory:
    Operator changes    .               ->  ~
    Invariant sigils    $hash{$key}     ->  %hash{$key}
    Casts               @{$arrayref}    ->  @($arrayref)
    Nums with trailing. 42.             ->  42.0
    KeywordNoSpace      if(             ->  if (
    Bare hash keys      $hash{KEY}      ->  %hash{'KEY'}
    map/grep comma      @z=map {...} @a ->  @z=map {...}, @a
    mapish EXPR         @z=map !$_,  @a ->  @z=map { !$_ }, @a
  Optional:
    Warnings for user review of transforms.

Planned/TODO:
  Mandatory:
    for/loop            for(;$i>5;$i++) ->  loop (;$i>5;$i++)
    foreach arrow       for my $i (@a)  ->  for @a -> $i
    open                open my $fh,... ->  my $fh = open...
    bareword filehandle open FH, ...    ->  my $FH = open...
    readline via <>     <$fh>           ->  $fh.get (if scalar)
    readline func       readline $fh    ->  $fh.get (if scalar)
    while readline      while (<$fh>){} ->  for $fh.lines {}
    magic diamond       while (<>){}    ->  for lines() {...}
    ARGV/ARGS           @ARGV           ->  @*ARGS
    Hash init?          =>              ->  P5=>   (sometimes)
    rand function       rand            ->  P5rand
    qq changes          "${foo}bar"     ->  "{$foo}bar"
                        "\l$foo"        ->  "{lc $foo}"
                        "\v"
    double-underscore   __PACKAGE__     ->  $?PACKAGE
    indent-i_fiers      "$foo_bar-30"   ->  "$foo_bar\-30"
                                     or ->  "{$foo_bar}-30"
    syntax collisions   '\qq[...]'      -> '\\qq[...]'
      (especially qq)   "@array"        -> "@array[]"
                        "$a.b()"        -> "$a.b\()"
                        "abc{def()}ghi" ->       "abc\{def()\}ghi"
                                     or -> qq:!c "abc{def()}ghi"
    Unicode             "\N{NEGATED DOUBLE VERTICAL BAR DOUBLE RIGHT TURNSTILE}"
                                        -> "\c[NEGATED DOUBLE VERTICAL BAR DOUBLE RIGHT TURNSTILE]"
    Unicode? Lots!
  Optional (and configurable!):
    Hashkey short form  %hash{'KEY'}    ->  %hash<KEY>
    Remove parens       if ($foo) {}    ->  if $foo {}
    func vs method      @z=map {...} @a ->  @z=@a.map({...})
    Infinite loop       while (1) {...} ->  loop {...}
    qq un-hack          "@{[ $a * 2 ]}" ->  "{$a * 2}"
    print/say           print "Hi!\n"   ->  say "Hi!";
    Regex improvements  qr{ a [ ]+ b }x ->  re{ a b } XXXX smart spacing?
    Bad slurp           for (<fh>){}    ->  for $fh.slurp
    pick                int(rand 12)    ->  (^12).pick
    pick array          $a[rand @a]     ->  @a.pick
    Hash init           %h=map{$_=>1}@a ->  %h = @a X=> 1
    @_ handling         sub f{($n)=@_}  ->  sub f ($n) {}
    Divides             ($n % 2) == 0   ->  $n %% 2
    List::Util comma    first {...} @a  ->  first {...}, @a