Add basic submodule support

modules/git/submodule.go

@@ -1,6 +1,58 @@
+// Copyright 2014 The Gogs 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 git
 
+import (
+	"strings"
+)
+
 type SubModule struct {
 	Name string
 	Url  string
 }
+
+// SubModuleFile represents a file with submodule type.
+type SubModuleFile struct {
+	*Commit
+
+	refUrl string
+	refId  string
+}
+
+func NewSubModuleFile(c *Commit, refUrl, refId string) *SubModuleFile {
+	return &SubModuleFile{
+		Commit: c,
+		refUrl: refUrl,
+		refId:  refId,
+	}
+}
+
+// RefUrl guesses and returns reference URL.
+func (sf *SubModuleFile) RefUrl() string {
+	url := strings.TrimSuffix(sf.refUrl, ".git")
+
+	// git://xxx/user/repo
+	if strings.HasPrefix(url, "git://") {
+		return "http://" + strings.TrimPrefix(url, "git://")
+	}
+
+	// http[s]://xxx/user/repo
+	if strings.HasPrefix(url, "http://") || strings.HasPrefix(url, "https://") {
+		return url
+	}
+
+	// sysuser@xxx:user/repo
+	i := strings.Index(url, "@")
+	j := strings.LastIndex(url, ":")
+	if i > -1 && j > -1 {
+		return "http://" + url[i+1:j] + "/" + url[j+1:]
+	}
+	return url
+}
+
+// RefId returns reference ID.
+func (sf *SubModuleFile) RefId() string {
+	return sf.refId
+}