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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 %depsource; # dependency => source
my $parent = $$; # pid of parent
$SIG{USR1} = sub { kill 'HUP', 0 if not --$alive };
$SIG{HUP} = sub { exit 0 };
# collect dependencies for given files
for my $target (@ARGV) {
# if pdf, collect from Makefile
if ($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 not pdf, assume target is actually source file and collect from it
# (with build(1) syntax)
else {
my $i = 0;
my $source = $target;
$target =~ s,\.[^./]*$,,; $target .= '.pdf';
$deptarget{$source} = $target;
$depsource{$source} = $source;
open my $f, '<', $source;
while (<$f>) {
last if ++$i > 20;
if (/\s% (.*)/) {
$deptarget{$_} = $target for split /\s/, $1;
$depsource{$_} = $source for split /\s/, $1;
last;
}
}
close $f;
}
if (fork == 0) {
system 'xpdf', '-remote', "wpdf-$target", $target;
kill 'USR1', $parent;
exit;
}
$alive++;
}
die "no dependencies found\n" if not keys %deptarget;
# make pdf on demand
open my $p, '-|', 'when', keys %deptarget
or die "could not start watch: $!\n";
while (<$p>) {
chomp;
my ($cmd, $arg);
if (exists $depsource{$_}) {
$cmd = 'build';
$arg = $depsource{$_};
} else {
$cmd = 'make';
$arg = $deptarget{$_};
}
system($cmd, $arg) == 0
&& system('xpdf', '-remote', "wpdf-$deptarget{$_}", '-reload');
}
close $p;
exit($? != 0);
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