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

1 files changed, 95 insertions, 0 deletions

diff --git a/internal/gitutil/tag.go b/internal/gitutil/tag.go
new file mode 100644
index 00000000..86efd6cd
--- /dev/null
+++ b/internal/gitutil/tag.go
@@ -0,0 +1,95 @@
+// 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 (
+	"github.com/pkg/errors"
+)
+
+// TagsPage contains a list of tags and pagination information.
+type TagsPage struct {
+	// List of tags in the current page.
+	Tags []string
+	// Whether the results include the latest tag.
+	HasLatest bool
+	// When results do not include the latest tag, an indicator of 'after' to go back.
+	PreviousAfter string
+	// Whether there are more tags in the next page.
+	HasNext bool
+}
+
+func (moduler) ListTagsAfter(repoPath, after string, limit int) (*TagsPage, error) {
+	all, err := Module.RepoTags(repoPath)
+	if err != nil {
+		return nil, errors.Wrap(err, "get tags")
+	}
+	total := len(all)
+
+	if limit < 0 {
+		limit = 0
+	}
+
+	// Returns everything when no filter and no limit
+	if after == "" && limit == 0 {
+		return &TagsPage{
+			Tags:      all,
+			HasLatest: true,
+		}, nil
+	}
+
+	// No filter but has a limit, returns first X tags
+	if after == "" && limit > 0 {
+		endIdx := limit
+		if limit > total {
+			endIdx = total
+		}
+		return &TagsPage{
+			Tags:      all[:endIdx],
+			HasLatest: true,
+			HasNext:   limit < total,
+		}, nil
+	}
+
+	// Loop over all tags see if we can find the filter
+	previousAfter := ""
+	found := false
+	tags := make([]string, 0, len(all))
+	for i := range all {
+		if all[i] != after {
+			continue
+		}
+
+		found = true
+		if limit > 0 && i-limit >= 0 {
+			previousAfter = all[i-limit]
+		}
+
+		// In case filter is the oldest one
+		if i+1 < total {
+			tags = all[i+1:]
+		}
+		break
+	}
+
+	if !found {
+		tags = all
+	}
+
+	// If all tags after match is equal to the limit, it reaches the oldest tag as well.
+	if limit == 0 || len(tags) <= limit {
+		return &TagsPage{
+			Tags:          tags,
+			HasLatest:     !found,
+			PreviousAfter: previousAfter,
+		}, nil
+	}
+
+	return &TagsPage{
+		Tags:          tags[:limit],
+		HasLatest:     !found,
+		PreviousAfter: previousAfter,
+		HasNext:       true,
+	}, nil
+}