feat: add Sequence for running commands in order. Closes #413.

This deprecates Sequentially.

commands.go

@@ -119,6 +119,8 @@ func Tick(d time.Duration, fn func(time.Time) Msg) Cmd {
 //	}
 //
 //	cmd := Sequentially(saveStateCmd, Quit)
+//
+// Deprecated: use Sequence instead.
 func Sequentially(cmds ...Cmd) Cmd {
 	return func() Msg {
 		for _, cmd := range cmds {

examples/sequence/main.go

@@ -0,0 +1,40 @@
+package main
+
+// A simple example illustrating how to run a series of commands in order.
+
+import (
+	"fmt"
+	"os"
+
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+type model struct{}
+
+func (m model) Init() tea.Cmd {
+	return tea.Sequence(
+		tea.Println("A"),
+		tea.Println("B"),
+		tea.Println("C"),
+		tea.Quit,
+	)
+}
+
+func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg.(type) {
+	case tea.KeyMsg:
+		return m, tea.Quit
+	}
+	return m, nil
+}
+
+func (m model) View() string {
+	return ""
+}
+
+func main() {
+	if err := tea.NewProgram(model{}).Start(); err != nil {
+		fmt.Println("Uh oh:", err)
+		os.Exit(1)
+	}
+}

tea.go

@@ -532,6 +532,17 @@ func (p *Program) StartReturningModel() (Model, error) {
 			case execMsg:
 				// NB: this blocks.
 				p.exec(msg.cmd, msg.fn)
+
+			case sequenceMsg:
+				go func() {
+					// Execute commands one at a time, in order.
+					for _, cmd := range msg {
+						select {
+						case p.msgs <- cmd():
+						case <-p.ctx.Done():
+						}
+					}
+				}()
 			}
 
 			// Process internal messages for the renderer.
@@ -736,3 +747,14 @@ func (p *Program) Printf(template string, args ...interface{}) {
 		messageBody: fmt.Sprintf(template, args...),
 	}
 }
+
+// sequenceMsg is used interally to run the the given commands in order.
+type sequenceMsg []Cmd
+
+// Sequence runs the given commands one at a time, in order. Contrast this with
+// Batch, which runs commands concurrently.
+func Sequence(cmds ...Cmd) Cmd {
+	return func() Msg {
+		return sequenceMsg(cmds)
+	}
+}