Adding #issuecomment to the URL in E-Mail notifications (#1674)

* Added comment's hashtag to url for mail notifications.

Signed-off-by: Jonas <info@jonasfranz.software>

* Added comment's hashtag to url for mail notifications.
Added explanation to return statement.

Signed-off-by: Jonas <info@jonasfranz.software>

* Added comment's hashtag to url for mail notifications.
Added explanation to return statement + documentation.

Signed-off-by: Jonas <info@jonasfranz.software>

* Added comment's hashtag to url for mail notifications.

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Replacing in-line link generation with HTMLURL. (+gofmt)

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Replaced action-based model with nil-based model. (+gofmt)

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Replaced mailIssueActionToParticipants with mailIssueCommentToParticipants.

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Updating comment for mailIssueCommentToParticipants

Signed-off-by: Jonas Franz <info@jonasfranz.software>

models/issue_comment.go

 		log.Error(4, "GetIssueByID(%d): %v", c.IssueID, err)
 		return ""
 	}
-	return fmt.Sprintf("%s#issuecomment-%d", issue.HTMLURL(), c.ID)
+	return fmt.Sprintf("%s#%s", issue.HTMLURL(), c.HashTag())
 }
 
 // IssueURL formats a URL-string to the issue
 	case ActionReopenIssue:
 		issue.Content = fmt.Sprintf("Reopened #%d", issue.Index)
 	}
-	if err = mailIssueCommentToParticipants(issue, c.Poster, mentions); err != nil {
+	if err = mailIssueCommentToParticipants(issue, c.Poster, c, mentions); err != nil {
 		log.Error(4, "mailIssueCommentToParticipants: %v", err)
 	}
 

models/issue_mail.go

 // This function sends two list of emails:
 // 1. Repository watchers and users who are participated in comments.
 // 2. Users who are not in 1. but get mentioned in current issue/comment.
-func mailIssueCommentToParticipants(issue *Issue, doer *User, mentions []string) error {
+func mailIssueCommentToParticipants(issue *Issue, doer *User, comment *Comment, mentions []string) error {
 	if !setting.Service.EnableNotifyMail {
 		return nil
 	}
 		tos = append(tos, participants[i].Email)
 		names = append(names, participants[i].Name)
 	}
-	SendIssueCommentMail(issue, doer, tos)
+
+	SendIssueCommentMail(issue, doer, comment, tos)
 
 	// Mail mentioned people and exclude watchers.
 	names = append(names, doer.Name)
 
 		tos = append(tos, mentions[i])
 	}
-	SendIssueMentionMail(issue, doer, GetUserEmailsByNames(tos))
+	SendIssueMentionMail(issue, doer, comment, GetUserEmailsByNames(tos))
 
 	return nil
 }
 		return fmt.Errorf("UpdateIssueMentions [%d]: %v", issue.ID, err)
 	}
 
-	if err = mailIssueCommentToParticipants(issue, issue.Poster, mentions); err != nil {
+	if err = mailIssueCommentToParticipants(issue, issue.Poster, nil, mentions); err != nil {
 		log.Error(4, "mailIssueCommentToParticipants: %v", err)
 	}
 

models/mail.go

 	return data
 }
 
-func composeIssueMessage(issue *Issue, doer *User, tplName base.TplName, tos []string, info string) *mailer.Message {
+func composeIssueCommentMessage(issue *Issue, doer *User, comment *Comment, tplName base.TplName, tos []string, info string) *mailer.Message {
 	subject := issue.mailSubject()
 	body := string(markdown.RenderString(issue.Content, issue.Repo.HTMLURL(), issue.Repo.ComposeMetas()))
-	data := composeTplData(subject, body, issue.HTMLURL())
+
+	data := make(map[string]interface{}, 10)
+	if comment != nil {
+		data = composeTplData(subject, body, issue.HTMLURL()+"#"+comment.HashTag())
+	} else {
+		data = composeTplData(subject, body, issue.HTMLURL())
+	}
 	data["Doer"] = doer
 
 	var content bytes.Buffer
 }
 
 // SendIssueCommentMail composes and sends issue comment emails to target receivers.
-func SendIssueCommentMail(issue *Issue, doer *User, tos []string) {
+func SendIssueCommentMail(issue *Issue, doer *User, comment *Comment, tos []string) {
 	if len(tos) == 0 {
 		return
 	}
 
-	mailer.SendAsync(composeIssueMessage(issue, doer, mailIssueComment, tos, "issue comment"))
+	mailer.SendAsync(composeIssueCommentMessage(issue, doer, comment, mailIssueComment, tos, "issue comment"))
 }
 
 // SendIssueMentionMail composes and sends issue mention emails to target receivers.
-func SendIssueMentionMail(issue *Issue, doer *User, tos []string) {
+func SendIssueMentionMail(issue *Issue, doer *User, comment *Comment, tos []string) {
 	if len(tos) == 0 {
 		return
 	}
-	mailer.SendAsync(composeIssueMessage(issue, doer, mailIssueMention, tos, "issue mention"))
+	mailer.SendAsync(composeIssueCommentMessage(issue, doer, comment, mailIssueMention, tos, "issue mention"))
 }