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#! /usr/bin/perl -w
# example of how to call an appropriate viewer
#
# URLs must start with a scheme and shell metas should be already quoted
# (tin doesn't recognize URLs without a scheme and it quotes the metas)
use strict;
use warnings;
(my $pname = $0) =~ s#^.*/##;
die "Usage: $pname URL" if $#ARGV != 0;
# version Number
my $version = "0.1.2";
my ($method, $url, $match, @try);
$method = $url = $ARGV[0];
$method =~ s#^([^:]+):.*#$1#io;
# shell escape
$url =~ s#([\&\;\`\'\\\"\|\*\?\~\<\>\^\(\)\[\]\{\}\$\010\013\020\011])#\\$1#g;
if ($ENV{"BROWSER_".uc($method)}) {
push(@try, split(/:/, $ENV{"BROWSER_".uc($method)}));
} else {
if ($ENV{BROWSER}) {
push(@try, split(/:/, $ENV{BROWSER}));
} else { # set some defaults
push(@try, 'firefox -a firefox -remote openURL\(%s\)');
push(@try, 'mozilla -remote openURL\(%s\)');
push(@try, 'opera -remote openURL\(%s\)');
push(@try, qw(chromium 'galeon -n' 'epiphany -n' konqueror));
push(@try, 'lynx'); # prefer lynx over links as it can handle news:-urls
push(@try, qw('links2 -g' links w3m surf arora));
push(@try, 'kfmclient newTab'); # has no useful return-value on error
push(@try, 'xdg-open'); # xdg-open evaluates $BROWSER which is unset
}
}
for my $browser (@try) {
# ignore empty parts
next if ($browser =~ m/^$/o);
# expand %s if not preceded by odd number of %
$match = $browser =~ s/(?<!%)((?:%%)*)%s/$1$url/og;
# expand %c if not preceded by odd number of %
$browser =~ s/(?<!%)((?:%%)*)%c/$1:/og;
# reduce dubble %
$browser =~ s/%%/%/og;
# append URL if no %s expansion took place
$browser .= " ".$url if (!$match);
# leave loop if $browser was started successful
last if (system("$browser 2>/dev/null") == 0);
}
exit 0;
__END__
=head1 NAME
url_handler.pl - Spawn appropriate viewer for a given URL
=head1 SYNOPSIS
B<url_handler.pl> I<URL>
=head1 DESCRIPTION
B<url_handler.pl> takes an URL as argument and spawns the first executable
viewer found in either B<$BROWSER_I<SCHEME>> or B<$BROWSER>.
=head1 ENVIRONMENT
=over 4
=item B<$BROWSER_I<SCHEME>>
=back
The user's preferred utility to browse URLs of type I<SCHEME>. May actually
consist of a sequence of colon-separated browser commands to be tried in
order until one succeeds. If a command part contains %s, the URL is
substituted there, otherwise the browser command is simply called with the
URL as its last argument. %% is replaced by a single percent sign (%), and
%c is replaced by a colon (:).
Examples:
=over 2
=item $BROWSER_FTP="wget:ncftp"
=item $BROWSER_GOPHER="lynx:links"
=item $BROWSER_MAILTO="mutt:pine -url"
=item $BROWSER_NEWS="lynx"
=item $BROWSER_NNTP="lynx"
=back
Z<>
=over 4
=item B<$BROWSER>
=back
The user's preferred utility to browse URLs for which there is no special
viewer defined via B<$BROWSER_I<SCHEME>>. Again it may actually consist of a
sequence of colon-separated browser commands to be tried in order until one
succeeds. If a command part contains %s, the URL is substituted there,
otherwise the browser command is simply called with the URL as its last
argument. %% is replaced by a single percent sign (%), and %c is replaced
by a colon (:).
Examples:
=over 2
=item $BROWSER="firefox -a firefox -remote openURL\(%s\):opera:konqueror:links2 -g:lynx:w3m"
=back
=head1 SECURITY
B<url_handler.pl> was designed to work together with B<tin>(1) which only
issues shell escaped absolute URLs thus B<url_handler.pl> does not try hard
to shell escape its input nor does it convert relative URLs into absolute
ones! If you use B<url_handler.pl> from other applications be sure to at
least shell escaped its input!
=head1 AUTHOR
Urs Janssen E<lt>urs@tin.orgE<gt>
=head1 SEE ALSO
http://www.catb.org/~esr/BROWSER/
http://www.dwheeler.com/browse/secure_browser.html
=cut
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