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#!/usr/bin/perl
# wpdf -- view, watch and remake pdf based on Makefile
use strict;
use warnings;
my %deptarget; # dependency => target
# collect dependencies for given pdf files
for my $target (@ARGV) {
if ($target =~ /\.pdf$/) {
# try to directly parse out dependencies
open my $f, '<', 'Makefile'
or die "could not open Makefile: $!\n";
while (<$f>) {
next if not /^\Q$target\E:\s*(.*)/;
$deptarget{$_} = $target for split /\s/, $1;
goto found;
}
# try to get implicit dependencies
(my $esc = $target) =~ s/'/'"'"'/g;
open my $p, "make -ndv 2>&1 '$esc' |"
or die "could not run make: $!\n";
while (<$p>) {
next if not /^\Q$target\E:< = (.*)/;
$deptarget{$_} = $target for split /\s/, $1;
last;
}
close $p;
found: close $f;
exec('xpdf', '-remote', "wpdf-$target", $target) if fork == 0;
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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