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/pull_request_test.go

@@ -0,0 +1,108 @@
+// 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"
+	"testing"
+
+	"github.com/gogs/git-module"
+	"github.com/pkg/errors"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestModuler_PullRequestMeta(t *testing.T) {
+	headPath := "/head/path"
+	basePath := "/base/path"
+	headBranch := "head_branch"
+	baseBranch := "base_branch"
+	mergeBase := "MERGE-BASE"
+	changedFiles := []string{"a.go", "b.txt"}
+	commits := []*git.Commit{
+		{ID: git.MustIDFromString("adfd6da3c0a3fb038393144becbf37f14f780087")},
+	}
+
+	MockModule.RepoAddRemote = func(repoPath, name, url string, opts ...git.AddRemoteOptions) error {
+		if repoPath != headPath {
+			return fmt.Errorf("repoPath: want %q but got %q", headPath, repoPath)
+		} else if name == "" {
+			return errors.New("empty name")
+		} else if url != basePath {
+			return fmt.Errorf("url: want %q but got %q", basePath, url)
+		}
+
+		if len(opts) == 0 {
+			return errors.New("no options")
+		} else if !opts[0].Fetch {
+			return fmt.Errorf("opts.Fetch: want %v but got %v", true, opts[0].Fetch)
+		}
+
+		return nil
+	}
+	MockModule.RepoMergeBase = func(repoPath, base, head string, opts ...git.MergeBaseOptions) (string, error) {
+		if repoPath != headPath {
+			return "", fmt.Errorf("repoPath: want %q but got %q", headPath, repoPath)
+		} else if base == "" {
+			return "", errors.New("empty base")
+		} else if head != headBranch {
+			return "", fmt.Errorf("head: want %q but got %q", headBranch, head)
+		}
+
+		return mergeBase, nil
+	}
+	MockModule.RepoLog = func(repoPath, rev string, opts ...git.LogOptions) ([]*git.Commit, error) {
+		if repoPath != headPath {
+			return nil, fmt.Errorf("repoPath: want %q but got %q", headPath, repoPath)
+		}
+
+		expRev := mergeBase + "..." + headBranch
+		if rev != expRev {
+			return nil, fmt.Errorf("rev: want %q but got %q", expRev, rev)
+		}
+
+		return commits, nil
+	}
+	MockModule.RepoDiffNameOnly = func(repoPath, base, head string, opts ...git.DiffNameOnlyOptions) ([]string, error) {
+		if repoPath != headPath {
+			return nil, fmt.Errorf("repoPath: want %q but got %q", headPath, repoPath)
+		} else if base == "" {
+			return nil, errors.New("empty base")
+		} else if head != headBranch {
+			return nil, fmt.Errorf("head: want %q but got %q", headBranch, head)
+		}
+
+		if len(opts) == 0 {
+			return nil, errors.New("no options")
+		} else if !opts[0].NeedsMergeBase {
+			return nil, fmt.Errorf("opts.NeedsMergeBase: want %v but got %v", true, opts[0].NeedsMergeBase)
+		}
+
+		return changedFiles, nil
+	}
+	MockModule.RepoRemoveRemote = func(repoPath, name string, opts ...git.RemoveRemoteOptions) error {
+		if repoPath != headPath {
+			return fmt.Errorf("repoPath: want %q but got %q", headPath, repoPath)
+		} else if name == "" {
+			return errors.New("empty name")
+		}
+
+		return nil
+	}
+	defer func() {
+		MockModule = MockModuleStore{}
+	}()
+
+	meta, err := Module.PullRequestMeta(headPath, basePath, headBranch, baseBranch)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expMeta := &PullRequestMeta{
+		MergeBase: mergeBase,
+		Commits:   commits,
+		NumFiles:  2,
+	}
+	assert.Equal(t, expMeta, meta)
+}