Add Google Tasks integration (#43)

- New GoogleTasksClient for fetching and managing Google Tasks
- Tasks appear in Timeline view with yellow indicator dot
- Tap checkbox to complete/uncomplete tasks via Google API
- Shares credentials file with Google Calendar (GOOGLE_CREDENTIALS_FILE)
- Configure task list via GOOGLE_TASKS_LIST_ID env var (default: @default)
- Supports comma-separated list IDs for multiple lists

New files:
- internal/api/google_tasks.go - Google Tasks API client

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 19 insertions, 1 deletions

diff --git a/internal/handlers/handlers.go b/internal/handlers/handlers.go
index 115d903..0424e40 100644
--- a/internal/handlers/handlers.go
+++ b/internal/handlers/handlers.go
@@ -29,12 +29,13 @@ type Handler struct {
 	trelloClient         api.TrelloAPI
 	planToEatClient      api.PlanToEatAPI
 	googleCalendarClient api.GoogleCalendarAPI
+	googleTasksClient    api.GoogleTasksAPI
 	config               *config.Config
 	templates            *template.Template
 }
 
 // New creates a new Handler instance
-func New(s *store.Store, todoist api.TodoistAPI, trello api.TrelloAPI, planToEat api.PlanToEatAPI, googleCalendar api.GoogleCalendarAPI, cfg *config.Config) *Handler {
+func New(s *store.Store, todoist api.TodoistAPI, trello api.TrelloAPI, planToEat api.PlanToEatAPI, googleCalendar api.GoogleCalendarAPI, googleTasks api.GoogleTasksAPI, cfg *config.Config) *Handler {
 	// Parse templates including partials
 	tmpl, err := template.ParseGlob(filepath.Join(cfg.TemplateDir, "*.html"))
 	if err != nil {
@@ -53,6 +54,7 @@ func New(s *store.Store, todoist api.TodoistAPI, trello api.TrelloAPI, planToEat
 		trelloClient:         trello,
 		planToEatClient:      planToEat,
 		googleCalendarClient: googleCalendar,
+		googleTasksClient:    googleTasks,
 		config:               cfg,
 		templates:            tmpl,
 	}
@@ -640,6 +642,22 @@ func (h *Handler) handleAtomToggle(w http.ResponseWriter, r *http.Request, compl
 		} else {
 			err = h.store.UnresolveBug(bugID)
 		}
+	case "gtasks":
+		// Google Tasks - need list ID from form or use default
+		listID := r.FormValue("listId")
+		if listID == "" {
+			listID = "@default"
+		}
+		if h.googleTasksClient != nil {
+			if complete {
+				err = h.googleTasksClient.CompleteTask(ctx, listID, id)
+			} else {
+				err = h.googleTasksClient.UncompleteTask(ctx, listID, id)
+			}
+		} else {
+			JSONError(w, http.StatusServiceUnavailable, "Google Tasks not configured", nil)
+			return
+		}
 	default:
 		JSONError(w, http.StatusBadRequest, "Unknown source: "+source, nil)
 		return