scripts/distrobox/toolbox/gammastep.pl

#!/usr/bin/perl

# TODO: If gammastep is already running, allow location to update

use strict;
use warnings;

use LWP::UserAgent;
use JSON::XS;

my $location = "https://papillon.john.me.tz/data/location.json";
my $lat_lon = fetch_lat_lon($location);

my $pid = fork;
unless ($pid) {
    open(my $fh, ">", $ENV{HOME}."/.local/state/gammastep.pid");
    print $fh $$;
    close($fh);
    open($fh, ">", $ENV{HOME}."/.local/state/gammastep.status");
    print $fh 1;
    close($fh);

    open STDIN,  '/dev/null';
    open STDOUT, '>>/dev/null';
    open STDERR, '>>/dev/null';

    exec "exec $ENV{HOME}/.dotfiles/nix/bin/gammastep -l $lat_lon -b 0.7:0.3";
}

sub fetch_lat_lon
{
    my ($location) = shift;

    my $ua = LWP::UserAgent->new();
    my $json = JSON::XS->new();

    my $raw = $ua->get($location)->content();

    if (defined $raw) {
        my $decoded = $json->decode($raw);
        if (defined $decoded->{lat} && defined $decoded->{lon}) {
            return "$decoded->{lat}:$decoded->{lon}";
        }
    }
    sleep 5;
    return fetch_lat_lon($ua, $json, $location);
}

exit;