norm-page

#!/usr/bin/perl -CSDA -0777 -wp

# trim whitespace
s/^\p{PosixSpace}+|\p{PosixSpace}+$//g;

# extremely naive sentence boundary detector
# see https://ir.shef.ac.uk/cloughie/papers/sentences.pdf for the problem description,
# or just use Lingua::Sentence;
$_ .= /[\.?!]$/ ? "\n\n" : "\n";