feat(caldav): import caldav categories as Labels (#1413)

Resolves #1274

Co-authored-by: ce72 <christoph.ernst72@googlemail.com>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/1413
Reviewed-by: konrad <k@knt.li>
Co-authored-by: cernst <ce72@noreply.kolaente.de>
Co-committed-by: cernst <ce72@noreply.kolaente.de>

pkg/caldav/parsing.go

@@ -96,11 +96,23 @@ func ParseTaskFromVTODO(content string) (vTask *models.Task, err error) {
 	description := strings.ReplaceAll(task["DESCRIPTION"], "\\,", ",")
 	description = strings.ReplaceAll(description, "\\n", "\n")
 
+	var labels []*models.Label
+	if val, ok := task["CATEGORIES"]; ok {
+		categories := strings.Split(val, ",")
+		labels = make([]*models.Label, 0, len(categories))
+		for _, category := range categories {
+			labels = append(labels, &models.Label{
+				Title: category,
+			})
+		}
+	}
+
 	vTask = &models.Task{
 		UID:         task["UID"],
 		Title:       task["SUMMARY"],
 		Description: description,
 		Priority:    priority,
+		Labels:      labels,
 		DueDate:     caldavTimeToTimestamp(task["DUE"]),
 		Updated:     caldavTimeToTimestamp(task["DTSTAMP"]),
 		StartDate:   caldavTimeToTimestamp(task["DTSTART"]),

pkg/caldav/parsing_test.go

@@ -85,6 +85,39 @@ END:VCALENDAR`,
 				Updated:     time.Unix(1543626724, 0).In(config.GetTimeZone()),
 			},
 		},
+		{
+			name: "With categories",
+			args: args{content: `BEGIN:VCALENDAR
+VERSION:2.0
+METHOD:PUBLISH
+X-PUBLISHED-TTL:PT4H
+X-WR-CALNAME:test
+PRODID:-//RandomProdID which is not random//EN
+BEGIN:VTODO
+UID:randomuid
+DTSTAMP:20181201T011204
+SUMMARY:Todo #1
+DESCRIPTION:Lorem Ipsum
+CATEGORIES:cat1,cat2
+LAST-MODIFIED:00010101T000000
+END:VTODO
+END:VCALENDAR`,
+			},
+			wantVTask: &models.Task{
+				Title:       "Todo #1",
+				UID:         "randomuid",
+				Description: "Lorem Ipsum",
+				Labels: []*models.Label{
+					{
+						Title: "cat1",
+					},
+					{
+						Title: "cat2",
+					},
+				},
+				Updated: time.Unix(1543626724, 0).In(config.GetTimeZone()),
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {