JavaScript Bookmarklet Builder

make_bookmarklet.pl

#!/usr/bin/env perl
#
# http://daringfireball.net/2007/03/javascript_bookmarklet_builder

use strict;
use warnings;
use URI::Escape qw(uri_escape_utf8);
use open  IO  => ":utf8",		# UTF8 by default
		  ":std";				# Apply to STDIN/STDOUT/STDERR

my $source_code = do { local $/; <> };

# Zap the first line if there's already a bookmarklet comment:
$source_code =~ s{^// ?javascript:.+\n}{};

my $bookmarklet = $source_code;
for ($bookmarklet) {
	s{(^\s*//.+\n)}{}gm;		# Kill commented lines
	s{^\s*/\*.+?\*/\n?}{}gms;	# Kill block comments
	s{\t}{ }gm;					# Tabs to spaces
	s{[ ]{2,}}{ }gm;			# Space runs to one space
	s{^\s+}{}gm;				# Kill line-leading whitespace
	s{\s+$}{}gm;				# Kill line-ending whitespace
	s{\n}{}gm;					# Kill newlines
}

# Escape single- and double-quotes, spaces, control chars, unicode:
$bookmarklet = "javascript:" .
	uri_escape_utf8($bookmarklet, qq(%'" \x00-\x1f\x7f-\xff));

print "// $bookmarklet\n" . $source_code;

# Put bookmarklet on clipboard:
my $fh;
open($fh, '|-', '/usr/bin/pbcopy')
	or die "Failed to open pipe to /usr/bin/pbcopy - $!";
print $fh $bookmarklet
	or die "Failed to write to pbcopy pipe - $!";
close($fh)
	or die "Failed to close pipe to pbcopy - $!";


__END__

27 Jan 2014
- Switched from backticks to open() for the pipe to pbcopy. Thanks to John Siracusa.
- Added '%' to the list of characters to encode.

Not familiar with Perl, but I'm curious how you would go about passing a destination path to this script.. so you could output the bookmarklet JS to another location.

Really useful script. Thank you for sharing.
I've started working on a CoffeeScript/JavaScript version here for Node.JS.