From e892316068e0eebfc970d723eb2cbbd18e42a85c Mon Sep 17 00:00:00 2001
From: Patrick Spek <p.spek@tyil.nl>
Date: Tue, 20 Mar 2018 14:40:00 +0100
Subject: Fix :delete adverb

---
 lib/Config.pm6     | 21 +++++++++++++++++++++
 t/08-unsetting.t.t | 30 ++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 t/08-unsetting.t.t

diff --git a/lib/Config.pm6 b/lib/Config.pm6
index 91fafc2..a4bf3af 100644
--- a/lib/Config.pm6
+++ b/lib/Config.pm6
@@ -214,6 +214,27 @@ class Config is Associative is export
         self;
     }
 
+    multi method unset(Str $key)
+    {
+        self.unset($key.split(".").Array);
+    }
+
+    multi method unset(@parts)
+    {
+        my %index := $!content;
+        my $target = @parts.pop;
+
+        for @parts.list -> $part {
+            %index{$part} = {} unless defined(%index{$part});
+
+            %index := %index{$part};
+        }
+
+        %index{$target}:delete if %index{$target}:exists;
+
+        self;
+    }
+
     #| Write the current configuration to the given path. If
     #| no parser is given, it tries to use the parser that
     #| was used when loading the configuration.
diff --git a/t/08-unsetting.t.t b/t/08-unsetting.t.t
new file mode 100644
index 0000000..8837989
--- /dev/null
+++ b/t/08-unsetting.t.t
@@ -0,0 +1,30 @@
+#! /usr/bin/env perl6
+
+use v6.c;
+use Test;
+use lib "lib";
+
+plan 8;
+
+use Config;
+
+my $config = Config.new;
+
+$config.read: %(
+	a => "b",
+	c => %(
+		d => "e",
+	),
+);
+
+dd $config.get();
+
+ok $config<a>:exists, "'a' exists";
+ok $config<a>:delete, "'a' gets deleted";
+nok $config<a>:exists, "'a' no longer exists";
+ok $config<c>:exists, "'c' remains untouched";
+
+ok $config.has("c.d"), "'c.d' exists";
+ok $config.unset("c.d"), "'c.d' gets deleted";
+nok $config.has("c.d"), "'c.d' no longer exists";
+ok $config.has("c"), "'c' still exists";
-- 
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