Issue due date (#3794)

* Started adding deadline to ui

* Implemented basic issue due date managing

* Improved UI for due date managing

* Added at least write access to the repo in order to modify issue due dates

* Ui improvements

* Added issue comments creation when adding/modifying/removing a due date

* Show due date in issue list

* Added api support for issue due dates

* Fixed lint suggestions

* Added deadline to sdk

* Updated css

* Added support for adding/modifiying deadlines for pull requests via api

* Fixed comments not created when updating or removing a deadline

* update sdk (will do properly once go-gitea/go-sdk#103 is merged)

* enhanced updateIssueDeadline

* Removed unnessecary Issue.DeadlineString

* UI improvements

* Small improvments to comment creation
+ ui & validation improvements

* Check if an issue is overdue is now a seperate function

* Updated go-sdk with govendor as it was merged

* Simplified isOverdue method

* removed unessecary deadline to 0 set

* Update swagger definitions

* Added missing return

* Added an explanary comment

* Improved updateIssueDeadline method so it'll only update `deadline_unix`

* Small changes and improvements
* no need to explicitly load the issue when updating a deadline, just use whats already there
* small optimisations

* Added check if a deadline was modified before updating it

* Moved comment creating logic into its own function

* Code cleanup for creating deadline comment

* locale improvement

* When modifying a deadline, the old deadline is saved with the comment

* small improvments to xorm session handling when updating an issue deadline
+ style nitpicks

* style nitpicks

* Moved checking for if the user has write acces to middleware

1 files changed, 39 insertions, 3 deletions

diff --git a/models/issue.go b/models/issue.go
index 190b387530..7f83d59842 100644
--- a/models/issue.go
+++ b/models/issue.go
@@ -47,9 +47,10 @@ type Issue struct {
 	Ref             string
 
 	DeadlineUnix util.TimeStamp `xorm:"INDEX"`
-	CreatedUnix  util.TimeStamp `xorm:"INDEX created"`
-	UpdatedUnix  util.TimeStamp `xorm:"INDEX updated"`
-	ClosedUnix   util.TimeStamp `xorm:"INDEX"`
+
+	CreatedUnix util.TimeStamp `xorm:"INDEX created"`
+	UpdatedUnix util.TimeStamp `xorm:"INDEX updated"`
+	ClosedUnix  util.TimeStamp `xorm:"INDEX"`
 
 	Attachments      []*Attachment `xorm:"-"`
 	Comments         []*Comment    `xorm:"-"`
@@ -79,6 +80,11 @@ func (issue *Issue) loadTotalTimes(e Engine) (err error) {
 	return nil
 }
 
+// IsOverdue checks if the issue is overdue
+func (issue *Issue) IsOverdue() bool {
+	return util.TimeStampNow() >= issue.DeadlineUnix
+}
+
 func (issue *Issue) loadRepo(e Engine) (err error) {
 	if issue.Repo == nil {
 		issue.Repo, err = getRepositoryByID(e, issue.RepoID)
@@ -348,6 +354,9 @@ func (issue *Issue) APIFormat() *api.Issue {
 			apiIssue.PullRequest.Merged = issue.PullRequest.MergedUnix.AsTimePtr()
 		}
 	}
+	if issue.DeadlineUnix != 0 {
+		apiIssue.Deadline = issue.DeadlineUnix.AsTimePtr()
+	}
 
 	return apiIssue
 }
@@ -1522,3 +1531,30 @@ func updateIssue(e Engine, issue *Issue) error {
 func UpdateIssue(issue *Issue) error {
 	return updateIssue(x, issue)
 }
+
+// UpdateIssueDeadline updates an issue deadline and adds comments. Setting a deadline to 0 means deleting it.
+func UpdateIssueDeadline(issue *Issue, deadlineUnix util.TimeStamp, doer *User) (err error) {
+
+	// if the deadline hasn't changed do nothing
+	if issue.DeadlineUnix == deadlineUnix {
+		return nil
+	}
+
+	sess := x.NewSession()
+	defer sess.Close()
+	if err := sess.Begin(); err != nil {
+		return err
+	}
+
+	// Update the deadline
+	if err = updateIssueCols(sess, &Issue{ID: issue.ID, DeadlineUnix: deadlineUnix}, "deadline_unix"); err != nil {
+		return err
+	}
+
+	// Make the comment
+	if _, err = createDeadlineComment(sess, doer, issue, deadlineUnix); err != nil {
+		return fmt.Errorf("createRemovedDueDateComment: %v", err)
+	}
+
+	return sess.Commit()
+}