Deobfuscate code from vim

[nferraz]

Here's a small trick to deobfuscate code directly from vim, using B::Deparse. All you have to do is to put this in your vimrc:

    " Deparse obfuscated code
    nnoremap <silent> _d :.!perl -MO=Deparse 2>/dev/null<cr>
    vnoremap <silent> _d :!perl -MO=Deparse 2>/dev/null<cr>

Now, whenever you want to deparse a portion of the code, just press _d. For example, this line:

    --$|&&s|\n|-|;

Magically becomes:

    s/\n/-/ if --$|;

I find this particularly useful when I have to work with code that abuses Perl's TIMTOWTDIness:

    $foo and $bar or $baz = 1;

(Now imagine a three-lines long statement where the attribution comes at the end.) Using B::Deparse, the code becomes more legible:

    $baz = 1 unless $foo and $bar;

Unfortunatelly, B::Deparse has it own limitations; but I think this technique can be really useful in some situations.