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package Nix::Utils;
use File::Temp qw(tempdir);
our @ISA = qw(Exporter);
our @EXPORT = qw(checkURL uniq writeFile readFile mkTempDir);
$urlRE = "(?: [a-zA-Z][a-zA-Z0-9\+\-\.]*\:[a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*]+ )";
sub checkURL {
my ($url) = @_;
die "invalid URL ‘$url’\n" unless $url =~ /^ $urlRE $ /x;
}
sub uniq {
my %seen;
my @res;
foreach my $name (@_) {
next if $seen{$name};
$seen{$name} = 1;
push @res, $name;
}
return @res;
}
sub writeFile {
my ($fn, $s) = @_;
open TMP, ">$fn" or die "cannot create file `$fn': $!";
print TMP "$s" or die;
close TMP or die;
}
sub readFile {
local $/ = undef;
my ($fn) = @_;
open TMP, "<$fn" or die "cannot open file `$fn': $!";
my $s = <TMP>;
close TMP or die;
return $s;
}
sub mkTempDir {
my ($name) = @_;
return tempdir("$name.XXXXXX", CLEANUP => 1, DIR => $ENV{"TMPDIR"} // $ENV{"XDG_RUNTIME_DIR"} // "/tmp")
or die "cannot create a temporary directory";
}
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