feat: port template-parsing logic from influxdb (#146)

pkg/github/normalize_test.go

@@ -0,0 +1,47 @@
+package github_test
+
+import (
+	"net/url"
+	"testing"
+
+	"github.com/influxdata/influx-cli/v2/pkg/github"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNormalize(t *testing.T) {
+	t.Parallel()
+
+	testCases := []struct {
+		name string
+		in   url.URL
+		exts []string
+		out  url.URL
+	}{
+		{
+			name: "github URL",
+			in:   url.URL{Host: "github.com", Path: "/influxdata/influxdb/blob/master/flags.yml"},
+			out:  url.URL{Host: "raw.githubusercontent.com", Path: "/influxdata/influxdb/master/flags.yml"},
+		},
+		{
+			name: "other URL",
+			in:   url.URL{Host: "google.com", Path: "/fake.yml"},
+			out:  url.URL{Host: "google.com", Path: "/fake.yml"},
+		},
+		{
+			name: "github URL - wrong extension",
+			in:   url.URL{Host: "github.com", Path: "/influxdata/influxdb/blob/master/flags.yml"},
+			exts: []string{"json"},
+			out:  url.URL{Host: "github.com", Path: "/influxdata/influxdb/blob/master/flags.yml"},
+		},
+	}
+
+	for _, tc := range testCases {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+
+			normalized := github.NormalizeURLToContent(&tc.in, tc.exts...)
+			require.Equal(t, tc.out, *normalized)
+		})
+	}
+}