Populate URL field of API commits (#3546)

* Populate URL field of API commits

* fix orgmode_test

modules/util/util_test.go

@@ -0,0 +1,36 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package util
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestURLJoin(t *testing.T) {
+	type test struct {
+		Expected string
+		Base     string
+		Elements []string
+	}
+	newTest := func(expected, base string, elements ...string) test {
+		return test{Expected: expected, Base: base, Elements: elements}
+	}
+	for _, test := range []test{
+		newTest("https://try.gitea.io/a/b/c",
+			"https://try.gitea.io", "a/b", "c"),
+		newTest("https://try.gitea.io/a/b/c",
+			"https://try.gitea.io/", "/a/b/", "/c/"),
+		newTest("https://try.gitea.io/a/c",
+			"https://try.gitea.io/", "/a/./b/", "../c/"),
+		newTest("a/b/c",
+			"a", "b/c/"),
+		newTest("a/b/d",
+			"a/", "b/c/", "/../d/"),
+	} {
+		assert.Equal(t, test.Expected, URLJoin(test.Base, test.Elements...))
+	}
+}