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#!/usr/bin/perl
# wpdf -- view, watch and remake pdf based on Makefile
use strict;
use warnings;
my $alive; # number of children alive
my %deptarget; # dependency => target
my $parent = $$; # pid of parent
$SIG{USR1} = sub { kill 'HUP', 0 if not --$alive };
$SIG{HUP} = sub { exit 0 };
# collect dependencies for given pdf files
for my $target (@ARGV) {
if ($target =~ /\.pdf$/) {
(my $basename = $target) =~ s/\.pdf$//;
open my $f, '<', 'Makefile'
or die "could not open Makefile: $!\n";
while (<$f>) {
# explicit
if (/^\Q$target\E:\s*(.*)/) {
$deptarget{$_} = $target for split /\s/, $1;
last;
}
# implicit
if (/^\.([^ .]+)\.pdf\s*:\s*(.*)/) {
$deptarget{"$basename.$1"} = $target;
$deptarget{$_} = $target for split /\s/, $2;
last;
}
}
close $f;
if (fork == 0) {
system 'xpdf', '-remote', "wpdf-$target", $target;
kill 'USR1', $parent;
exit;
}
$alive++;
next;
} else {
warn "skipping $_: not a pdf\n";
}
}
# make pdf on demand
open my $p, '-|', 'watch', keys %deptarget
or die "could not start watch: $!\n";
while (<$p>) {
chomp;
system('make', "$deptarget{$_}") == 0
&& system('xpdf', '-remote', "wpdf-$deptarget{$_}", '-reload');
}
close $p;
exit($? != 0);
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