fix(tasklist): migrate old tasklist format

Resolves https://community.vikunja.io/t/task-list-from-0-21-0-0-23-0/2340
Resolves https://community.vikunja.io/t/general-feedback-after-trying-out-vikunja/1943/6

pkg/migration/20240603172746.go

@@ -0,0 +1,84 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-present Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public Licensee as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public Licensee for more details.
+//
+// You should have received a copy of the GNU Affero General Public Licensee
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package migration
+
+import (
+	"regexp"
+	"strings"
+
+	"src.techknowlogick.com/xormigrate"
+	"xorm.io/xorm"
+)
+
+func convertChecklistInDescription(tx *xorm.Engine, table string, column string) (err error) {
+	items := []map[string]interface{}{}
+	err = tx.Table(table).
+		Select("id, " + column).
+		Find(&items)
+	if err != nil {
+		return
+	}
+
+	for _, item := range items {
+		if !strings.Contains(item[column].(string), "<li>[") {
+			continue
+		}
+
+		var re = regexp.MustCompile(`<ul>(\n)?<li>`)
+		item[column] = re.ReplaceAllString(item[column].(string), `<ul data-type="taskList"><li>`)
+
+		item[column] = strings.ReplaceAll(item[column].(string), "<li>[ ] ", `<li data-checked="false" data-type="taskItem"><label><input type="checkbox"><span></span></label>`)
+		item[column] = strings.ReplaceAll(item[column].(string), "<li>[x] ", `<li data-checked="true" data-type="taskItem"><label><input type="checkbox" checked="checked"><span></span></label>`)
+
+		_, err = tx.Where("id = ?", item["id"]).
+			Table(table).
+			Cols(column).
+			Update(item)
+		if err != nil {
+			return
+		}
+	}
+
+	return nil
+}
+
+func init() {
+	migrations = append(migrations, &xormigrate.Migration{
+		ID:          "20240603172746",
+		Description: "Convert unconverted checklists to proper html",
+		Migrate: func(tx *xorm.Engine) (err error) {
+			for _, table := range []string{
+				"tasks",
+				"labels",
+				"projects",
+				"saved_filters",
+				"teams",
+			} {
+				err = convertChecklistInDescription(tx, table, "description")
+				if err != nil {
+					return
+				}
+			}
+
+			err = convertChecklistInDescription(tx, "task_comments", "comment")
+			return
+		},
+		Rollback: func(tx *xorm.Engine) error {
+			return nil
+		},
+	})
+}