[FEATURE] - Terraform Registry Namespace (#202)

The namespaces documented on the terraform registry look like http://registry.terraform.io/namespace/<NAME>. We should choose to keep this arrangement so it's easy to copy and paste

pkg/cmd/search/terraform/registry.go

@@ -55,10 +55,13 @@ func New(endpoint string) (search.Interface, error) {
 	baseURL := fmt.Sprintf("https://%s", u.Host)
 
 	if u.Path != "" {
-		if strings.Count(u.Path, "/") > 1 {
-			return nil, errors.New("invalid endpoint, supports only one path i.e. https://registry.terraform.io/PATH")
+		items := strings.Split(strings.TrimSuffix(u.Path, "/"), "/")
+
+		switch {
+		case len(items) != 3, items[1] != "namespaces":
+			return nil, errors.New("invalid endpoint, supports only one path i.e. https://registry.terraform.io/namespaces/NAME")
 		}
-		namespace = strings.TrimPrefix(u.Path, "/")
+		namespace = items[2]
 	}
 
 	return &registry{

pkg/cmd/search/terraform/registry_test.go

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2022  Appvia Ltd <info@appvia.io>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package terraform
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNew(t *testing.T) {
+	c, err := New("https://registry.terraform.io")
+	assert.NoError(t, err)
+	assert.NotNil(t, c)
+}
+
+func TestInvalidNamespace(t *testing.T) {
+	c, err := New("https://registry.terraform.io/appvia")
+	assert.Error(t, err)
+	assert.Nil(t, c)
+}
+
+func TestValidNamespace(t *testing.T) {
+	c, err := New("https://registry.terraform.io/namespaces/appvia")
+	assert.NoError(t, err)
+	assert.NotNil(t, c)
+}
+
+func TestIsHandle(t *testing.T) {
+	cases := []struct {
+		Source   string
+		Expected bool
+	}{
+		{
+			Source: "",
+		},
+		{
+			Source: "appvia/terraform",
+		},
+		{
+			Source:   "terraform://appvia/terraform",
+			Expected: true,
+		},
+		{
+			Source:   "https://registry.terraform.io",
+			Expected: true,
+		},
+	}
+	for _, c := range cases {
+		assert.Equal(t, c.Expected, IsHandle(c.Source))
+	}
+}