Extract actions on new pull request from models to pulls service and move code.gitea.io/gitea/modules/pull to code.gitea.io/gitea/services/pull (#8218)

* extract actions on new pull request from models to pulls service

* improve code

* move code.gitea.io/gitea/modules/pull to code.gitea.io/gitea/services/pull

* fix fmt

* Rename pulls.go to pull.go

services/pull/pull.go

@@ -0,0 +1,49 @@
+// Copyright 2019 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 pull
+
+import (
+	"fmt"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/log"
+	api "code.gitea.io/gitea/modules/structs"
+)
+
+// NewPullRequest creates new pull request with labels for repository.
+func NewPullRequest(repo *models.Repository, pull *models.Issue, labelIDs []int64, uuids []string, pr *models.PullRequest, patch []byte, assigneeIDs []int64) error {
+	if err := models.NewPullRequest(repo, pull, labelIDs, uuids, pr, patch, assigneeIDs); err != nil {
+		return err
+	}
+
+	if err := models.NotifyWatchers(&models.Action{
+		ActUserID: pull.Poster.ID,
+		ActUser:   pull.Poster,
+		OpType:    models.ActionCreatePullRequest,
+		Content:   fmt.Sprintf("%d|%s", pull.Index, pull.Title),
+		RepoID:    repo.ID,
+		Repo:      repo,
+		IsPrivate: repo.IsPrivate,
+	}); err != nil {
+		log.Error("NotifyWatchers: %v", err)
+	}
+
+	pr.Issue = pull
+	pull.PullRequest = pr
+	mode, _ := models.AccessLevel(pull.Poster, repo)
+	if err := models.PrepareWebhooks(repo, models.HookEventPullRequest, &api.PullRequestPayload{
+		Action:      api.HookIssueOpened,
+		Index:       pull.Index,
+		PullRequest: pr.APIFormat(),
+		Repository:  repo.APIFormat(mode),
+		Sender:      pull.Poster.APIFormat(),
+	}); err != nil {
+		log.Error("PrepareWebhooks: %v", err)
+	} else {
+		go models.HookQueue.Add(repo.ID)
+	}
+
+	return nil
+}