only use libnotify on Linux

main.go

@@ -4,10 +4,18 @@ import (
 	"encoding/json"
 	"github.com/jawher/mow.cli"
 	"os"
+	"runtime"
 	"sort"
 	"time"
 )
 
+func notifier() Notifier {
+	if runtime.GOOS == "linux" {
+		return NewLibNotifier()
+	}
+	return NoopNotifier{}
+}
+
 func start(path *string) func(*cli.Cmd) {
 	return func(cmd *cli.Cmd) {
 		cmd.Spec = "[OPTIONS] MESSAGE"
@@ -29,11 +37,10 @@ func start(path *string) func(*cli.Cmd) {
 				NPomodoros: *pomodoros,
 				Duration:   parsed,
 			}
-			runner, err := NewTaskRunner(task, db)
+			runner, err := NewTaskRunner(task, db, notifier())
 			maybe(err)
 			runner.Start()
 			startUI(runner)
-			//maybe(runner.Run())
 		}
 	}
 }

task.go

@@ -19,7 +19,7 @@ type TaskRunner struct {
 	duration     time.Duration
 }
 
-func NewTaskRunner(task *Task, store *Store) (*TaskRunner, error) {
+func NewTaskRunner(task *Task, store *Store, notifier Notifier) (*TaskRunner, error) {
 	taskID, err := store.CreateTask(*task)
 	if err != nil {
 		return nil, err
@@ -33,7 +33,7 @@ func NewTaskRunner(task *Task, store *Store) (*TaskRunner, error) {
 		state:        State(0),
 		pause:        make(chan bool),
 		toggle:       make(chan bool),
-		notifier:     NewLibNotifier(),
+		notifier:     notifier,
 		duration:     task.Duration,
 	}
 	return tr, nil
@@ -97,6 +97,8 @@ func (t *TaskRunner) run() error {
 		if t.count == t.nPomodoros {
 			break
 		}
+
+		t.notifier.Notify("Pomo", "It is time to take a break!")
 		// Reset the duration incase it
 		// was paused.
 		t.duration = t.origDuration

task_test.go

@@ -21,7 +21,7 @@ func TestTaskRunner(t *testing.T) {
 		Duration:   time.Second * 2,
 		NPomodoros: 2,
 		Message:    fmt.Sprint("Test Task"),
-	}, store)
+	}, store, NoopNotifier{})
 	if err != nil {
 		t.Error(err)
 	}

types.go

@@ -139,6 +139,11 @@ type Notifier interface {
 	Notify(string, string) error
 }
 
+// NoopNotifier does nothing
+type NoopNotifier struct{}
+
+func (n NoopNotifier) Notify(string, string) error { return nil }
+
 // LibNotifier implements a Linux
 // notifier client.
 type LibNotifier struct {