Programs should take an init type/function as the first argument

This is in line with the way Elm works. Also update examples.

examples/fullscreen/main.go

@@ -17,12 +17,16 @@ type tickMsg struct{}
 func main() {
 	tea.Fullscreen()
 	defer tea.ExitFullscreen()
-	err := tea.NewProgram(model(5), update, view, []tea.Sub{tick}).Start()
+	err := tea.NewProgram(initialize, update, view, []tea.Sub{tick}).Start()
 	if err != nil {
 		log.Fatal(err)
 	}
 }
 
+func initialize() (tea.Model, tea.Cmd) {
+	return model(5), nil
+}
+
 func update(message tea.Msg, mdl tea.Model) (tea.Model, tea.Cmd) {
 	m, _ := mdl.(model)
 

examples/input/go.mod

@@ -1,5 +0,0 @@
-module input-example
-
-go 1.13
-
-require github.com/charmbracelet/teaparty v0.0.0-20200118155738-c83a0bee59b9 // indirect

examples/input/go.sum

@@ -1,6 +0,0 @@
-github.com/charmbracelet/tea v0.0.0-20200118154546-df52853f9d94 h1:m2xhUqOw6OcefbPBR9Il0J0n0gB1663NoKU+vvkiLdU=
-github.com/charmbracelet/tea v0.0.0-20200118154546-df52853f9d94/go.mod h1:lijy1lXOKNwMjBu/jTT/DvR8yE9PhtX2olGFsCz9/Vk=
-github.com/charmbracelet/teaparty v0.0.0-20200118155738-c83a0bee59b9 h1:YQvJgppGVexnzIJ+KJlK9lBYA3+zXfdqZO/5Ngedtb0=
-github.com/charmbracelet/teaparty v0.0.0-20200118155738-c83a0bee59b9/go.mod h1:z8JWtuxM0oA+dZfi7BkgBW2YGbyOTbWAixFs46W3SK4=
-github.com/pkg/term v0.0.0-20190109203006-aa71e9d9e942 h1:A7GG7zcGjl3jqAqGPmcNjd/D9hzL95SuoOQAaFNdLU0=
-github.com/pkg/term v0.0.0-20190109203006-aa71e9d9e942/go.mod h1:eCbImbZ95eXtAUIbLAuAVnBnwf83mjf6QIVH8SHYwqQ=

examples/input/main.go

@@ -22,10 +22,7 @@ func main() {
 	tea.UseSysLog("tea")
 
 	p := tea.NewProgram(
-		Model{
-			Input: input.DefaultModel(),
-			Error: nil,
-		},
+		initialize,
 		update,
 		view,
 		[]tea.Sub{
@@ -46,6 +43,13 @@ func main() {
 	}
 }
 
+func initialize() (tea.Model, tea.Cmd) {
+	return Model{
+		Input: input.DefaultModel(),
+		Error: nil,
+	}, nil
+}
+
 func update(msg tea.Msg, model tea.Model) (tea.Model, tea.Cmd) {
 	var cmd tea.Cmd
 	m, ok := model.(Model)

examples/simple/main.go

@@ -21,12 +21,16 @@ type TickMsg struct{}
 
 func main() {
 	// Initialize our program
-	p := tea.NewProgram(Model(5), update, view, []tea.Sub{tick})
+	p := tea.NewProgram(initialize, update, view, []tea.Sub{tick})
 	if err := p.Start(); err != nil {
 		log.Fatal(err)
 	}
 }
 
+func initialize() (tea.Model, tea.Cmd) {
+	return Model(5), nil
+}
+
 // Update is called when messages are recived. The idea is that you inspect
 // the message and update the model (or send back a new one) accordingly. You
 // can also return a commmand, which is a function that peforms I/O and

examples/views/main.go

@@ -28,7 +28,7 @@ type frameMsg struct{}
 
 func main() {
 	p := tea.NewProgram(
-		Model{0, false, 10, 0, 0, false},
+		initialize,
 		update,
 		view,
 		[]tea.Sub{tick, frame},
@@ -38,6 +38,12 @@ func main() {
 	}
 }
 
+// INIT
+
+func initialize() (tea.Model, tea.Cmd) {
+	return Model{0, false, 10, 0, 0, false}, nil
+}
+
 // SUBSCRIPTIONS
 
 func tick(model tea.Model) tea.Msg {