Display current stopwatch in navbar (#14122)

* add notification about running stopwatch to header

* serialize seconds, duration in stopwatches api

* ajax update stopwatch

i should get my testenv working locally...

* new variant: hover dialog

* noscript compatibility

* js: live-update stopwatch time

* js live update robustness

routers/repo/issue_stopwatch.go

@@ -6,6 +6,7 @@ package repo
 
 import (
 	"net/http"
+	"strings"
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/context"
@@ -61,3 +62,47 @@ func CancelStopwatch(c *context.Context) {
 	url := issue.HTMLURL()
 	c.Redirect(url, http.StatusSeeOther)
 }
+
+// GetActiveStopwatch is the middleware that sets .ActiveStopwatch on context
+func GetActiveStopwatch(c *context.Context) {
+	if strings.HasPrefix(c.Req.URL.Path, "/api") {
+		return
+	}
+
+	if !c.IsSigned {
+		return
+	}
+
+	_, sw, err := models.HasUserStopwatch(c.User.ID)
+	if err != nil {
+		c.ServerError("HasUserStopwatch", err)
+		return
+	}
+
+	if sw == nil || sw.ID == 0 {
+		return
+	}
+
+	issue, err := models.GetIssueByID(sw.IssueID)
+	if err != nil || issue == nil {
+		c.ServerError("GetIssueByID", err)
+		return
+	}
+	if err = issue.LoadRepo(); err != nil {
+		c.ServerError("LoadRepo", err)
+		return
+	}
+
+	c.Data["ActiveStopwatch"] = StopwatchTmplInfo{
+		issue.Repo.FullName(),
+		issue.Index,
+		sw.Seconds() + 1, // ensure time is never zero in ui
+	}
+}
+
+// StopwatchTmplInfo is a view on a stopwatch specifically for template rendering
+type StopwatchTmplInfo struct {
+	RepoSlug   string
+	IssueIndex int64
+	Seconds    int64
+}