git: migrate to github.com/gogs/git-module@v1.0.0 (#5958)

* WIP

* Finish `internal/db/git_diff.go`

* FInish internal/db/mirror.go

* Finish internal/db/pull.go

* Finish internal/db/release.go

* Finish internal/db/repo.go

* Finish internal/db/repo_branch.go

* Finish internal/db/repo_editor.go

* Finish internal/db/update.go

* Save my work

* Add license header

* Compile!

* Merge master

* Finish internal/cmd/hook.go

* Finish internal/conf/static.go

* Finish internal/context/repo.go

* Finish internal/db/action.go

* Finish internal/db/git_diff.go

* Fix submodule URL inferring

* Finish internal/db/mirror.go

* Updat to beta.4

* css: update fonts

* Finish internal/db/pull.go

* Finish internal/db/release.go

* Finish internal/db/repo_branch.go

* Finish internal/db/wiki.go

* gitutil: enhance infer submodule UR

* Finish internal/route/api/v1/repo/commits.go

* mirror: only collect branch commits after sync

* mirror: fix tag support

* Finish internal/db/repo.go

* Finish internal/db/repo_editor.go

* Finish internal/db/update.go

* Finish internal/gitutil/pull_request.go

* Make it compile

* Finish internal/route/repo/setting.go

* Finish internal/route/repo/branch.go

* Finish internal/route/api/v1/repo/file.go

* Finish internal/route/repo/download.go

* Finish internal/route/repo/editor.go

* Use helper

* Finish internal/route/repo/issue.go

* Finish internal/route/repo/pull.go

* Finish internal/route/repo/release.go

* Finish internal/route/repo/repo.go

* Finish internal/route/repo/wiki.go

* Finish internal/route/repo/commit.go

* Finish internal/route/repo/view.go

* Finish internal/gitutil/tag.go

* go.sum

internal/gitutil/submodule.go

@@ -0,0 +1,48 @@
+// Copyright 2020 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 gitutil
+
+import (
+	"fmt"
+	"net/url"
+	"strings"
+
+	"github.com/gogs/git-module"
+
+	"gogs.io/gogs/internal/lazyregexp"
+)
+
+var scpSyntax = lazyregexp.New(`^([a-zA-Z0-9_]+@)?([a-zA-Z0-9._-]+):(.*)$`)
+
+// InferSubmoduleURL returns the inferred external URL of the submodule at best effort.
+func InferSubmoduleURL(mod *git.Submodule) string {
+	raw := strings.TrimSuffix(mod.URL, "/")
+	raw = strings.TrimSuffix(raw, ".git")
+
+	parsed, err := url.Parse(raw)
+	if err != nil {
+		// Try parse as SCP syntax again
+		match := scpSyntax.FindAllStringSubmatch(raw, -1)
+		if len(match) == 0 {
+			return mod.URL
+		}
+		parsed = &url.URL{
+			Scheme: "http",
+			Host:   match[0][2],
+			Path:   match[0][3],
+		}
+	}
+
+	switch parsed.Scheme {
+	case "http", "https":
+		raw = parsed.String()
+	case "ssh":
+		raw = fmt.Sprintf("http://%s%s", parsed.Host, parsed.Path)
+	default:
+		return raw
+	}
+
+	return fmt.Sprintf("%s/commit/%s", raw, mod.Commit)
+}