1 files changed, 97 insertions, 0 deletions
diff --git a/lib/Devscripts/JSONCache.pm b/lib/Devscripts/JSONCache.pm
new file mode 100644
index 0000000..b2e8761
--- /dev/null
+++ b/lib/Devscripts/JSONCache.pm
@@ -0,0 +1,97 @@
+package Devscripts::JSONCache;
+
+use strict;
+use JSON;
+use Moo;
+
+has file => (is => 'rw', required => 1);
+
+has saved => (is => 'rw');
+
+has _data => (is => 'rw');
+
+sub save_sec {
+    my ($self, $obj) = @_;
+    my $tmp = umask;
+    umask 0177;
+    open(my $fh, '>', $self->file) or ($self->saved(1) and die $!);
+    print $fh JSON::to_json($obj);
+    close $fh;
+    umask $tmp;
+}
+
+sub data {
+    my ($self) = @_;
+    return $self->_data if $self->_data;
+    my $res;
+    if (-r $self->file) {
+        open(F, $self->file) or ($self->saved(1) and die $!);
+        $res = JSON::from_json(join('', <F>) || "{}");
+        close F;
+    } else {
+        $self->save_sec({});
+        $self->saved(0);
+    }
+    return $self->_data($res);
+}
+
+sub TIEHASH {
+    my $r = shift->new({
+        file => shift,
+        @_,
+    });
+    # build data
+    $r->data;
+    return $r;
+}
+
+sub FETCH {
+    return $_[0]->data->{ $_[1] };
+}
+
+sub STORE {
+    $_[0]->data->{ $_[1] } = $_[2];
+}
+
+sub DELETE {
+    delete $_[0]->data->{ $_[1] };
+}
+
+sub CLEAR {
+    $_[0]->save({});
+}
+
+sub EXISTS {
+    return exists $_[0]->data->{ $_[1] };
+}
+
+sub FIRSTKEY {
+    my ($k) = sort { $a cmp $b } keys %{ $_[0]->data };
+    return $k;
+}
+
+sub NEXTKEY {
+    my ($self, $last) = @_;
+    my $i    = 0;
+    my @keys = map {
+        return $_ if ($i);
+        $i++      if ($_ eq $last);
+        return ()
+      }
+      sort { $a cmp $b } keys %{ $_[0]->data };
+    return @keys ? $keys[0] : ();
+}
+
+sub SCALAR {
+    return scalar %{ $_[0]->data };
+}
+
+sub save {
+    return if ($_[0]->saved);
+    eval { $_[0]->save_sec($_[0]->data); };
+    $_[0]->saved(1);
+}
+
+*DESTROY = *UNTIE = *save;
+
+1;