1 files changed, 38 insertions, 0 deletions
diff --git a/perl/lib/Nix/Utils.pm b/perl/lib/Nix/Utils.pm
new file mode 100644
index 000000000000..78d3db54270d
--- /dev/null
+++ b/perl/lib/Nix/Utils.pm
@@ -0,0 +1,38 @@
+package Nix::Utils;
+
+our @ISA = qw(Exporter);
+our @EXPORT = qw(checkURL uniq writeFile readFile);
+
+$urlRE = "(?: [a-zA-Z][a-zA-Z0-9\+\-\.]*\:[a-zA-Z0-9\%\/\?\:\@\&\=\+\$\,\-\_\.\!\~\*]+ )";
+
+sub checkURL {
+    my ($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;
+}