docs: fix lint issues in examples and tutorials (#759)

Signed-off-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>

examples/cellbuffer/main.go

@@ -18,13 +18,13 @@ const (
 	fps       = 60
 	frequency = 7.5
 	damping   = 0.15
+	asterisk  = "*"
 )
 
 func drawEllipse(cb *cellbuffer, xc, yc, rx, ry float64) {
-	const c = "*"
 	var (
 		dx, dy, d1, d2 float64
-		x              float64 = 0
+		x              float64
 		y              = ry
 	)
 
@@ -33,10 +33,10 @@ func drawEllipse(cb *cellbuffer, xc, yc, rx, ry float64) {
 	dy = 2 * rx * rx * y
 
 	for dx < dy {
-		cb.set(c, int(x+xc), int(y+yc))
+		cb.set(int(x+xc), int(y+yc))
-		cb.set(c, int(-x+xc), int(y+yc))
+		cb.set(int(-x+xc), int(y+yc))
-		cb.set(c, int(x+xc), int(-y+yc))
+		cb.set(int(x+xc), int(-y+yc))
-		cb.set(c, int(-x+xc), int(-y+yc))
+		cb.set(int(-x+xc), int(-y+yc))
 		if d1 < 0 {
 			x++
 			dx = dx + (2 * ry * ry)
@@ -53,10 +53,10 @@ func drawEllipse(cb *cellbuffer, xc, yc, rx, ry float64) {
 	d2 = ((ry * ry) * ((x + 0.5) * (x + 0.5))) + ((rx * rx) * ((y - 1) * (y - 1))) - (rx * rx * ry * ry)
 
 	for y >= 0 {
-		cb.set(c, int(x+xc), int(y+yc))
+		cb.set(int(x+xc), int(y+yc))
-		cb.set(c, int(-x+xc), int(y+yc))
+		cb.set(int(-x+xc), int(y+yc))
-		cb.set(c, int(x+xc), int(-y+yc))
+		cb.set(int(x+xc), int(-y+yc))
-		cb.set(c, int(-x+xc), int(-y+yc))
+		cb.set(int(-x+xc), int(-y+yc))
 		if d2 > 0 {
 			y--
 			dy = dy - (2 * rx * rx)
@@ -85,16 +85,12 @@ func (c *cellbuffer) init(w, h int) {
 	c.wipe()
 }
 
-func (c cellbuffer) set(v string, x, y int) {
+func (c cellbuffer) set(x, y int) {
 	i := y*c.stride + x
 	if i > len(c.cells)-1 || x < 0 || y < 0 || x >= c.width() || y >= c.height() {
 		return
 	}
-	c.cells[i] = v
+	c.cells[i] = asterisk
-}
-
-func (c *cellbuffer) clear(x, y int) {
-	c.set(" ", x, y)
 }
 
 func (c *cellbuffer) wipe() {

examples/composable-views/main.go

@@ -98,7 +98,7 @@ func (m mainModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			} else {
 				m.Next()
 				m.resetSpinner()
-				cmds = append(cmds, spinner.Tick)
+				cmds = append(cmds, m.spinner.Tick)
 			}
 		}
 		switch m.state {

examples/help/main.go

@@ -132,12 +132,12 @@ func (m model) View() string {
 
 func main() {
 	if os.Getenv("HELP_DEBUG") != "" {
-		if f, err := tea.LogToFile("debug.log", "help"); err != nil {
+		f, err := tea.LogToFile("debug.log", "help")
+		if err != nil {
 			fmt.Println("Couldn't open a file for logging:", err)
 			os.Exit(1)
-		} else {
-			defer f.Close()
 		}
+		defer f.Close() // nolint:errcheck
 	}
 
 	if _, err := tea.NewProgram(newModel()).Run(); err != nil {

examples/http/main.go

@@ -76,7 +76,7 @@ func checkServer() tea.Msg {
 	if err != nil {
 		return errMsg{err}
 	}
-	defer res.Body.Close()
+	defer res.Body.Close() // nolint:errcheck
 
 	return statusMsg(res.StatusCode)
 }

examples/list-simple/main.go

@@ -30,7 +30,7 @@ type itemDelegate struct{}
 
 func (d itemDelegate) Height() int                             { return 1 }
 func (d itemDelegate) Spacing() int                            { return 0 }
-func (d itemDelegate) Update(msg tea.Msg, m *list.Model) tea.Cmd { return nil }
+func (d itemDelegate) Update(_ tea.Msg, _ *list.Model) tea.Cmd { return nil }
 func (d itemDelegate) Render(w io.Writer, m list.Model, index int, listItem list.Item) {
 	i, ok := listItem.(item)
 	if !ok {

examples/package-manager/main.go

@@ -115,7 +115,7 @@ type installedPkgMsg string
 func downloadAndInstall(pkg string) tea.Cmd {
 	// This is where you'd do i/o stuff to download and install packages. In
 	// our case we're just pausing for a moment to simulate the process.
-	d := time.Millisecond * time.Duration(rand.Intn(500))
+	d := time.Millisecond * time.Duration(rand.Intn(500)) //nolint:gosec
 	return tea.Tick(d, func(t time.Time) tea.Msg {
 		return installedPkgMsg(pkg)
 	})
@@ -129,8 +129,6 @@ func max(a, b int) int {
 }
 
 func main() {
-	rand.Seed(time.Now().Unix())
-
 	if _, err := tea.NewProgram(newModel()).Run(); err != nil {
 		fmt.Println("Error running program:", err)
 		os.Exit(1)

examples/package-manager/packages.go

@@ -46,7 +46,7 @@ func getPackages() []string {
 	})
 
 	for k := range pkgs {
-		pkgs[k] += fmt.Sprintf("-%d.%d.%d", rand.Intn(10), rand.Intn(10), rand.Intn(10))
+		pkgs[k] += fmt.Sprintf("-%d.%d.%d", rand.Intn(10), rand.Intn(10), rand.Intn(10)) //nolint:gosec
 	}
 	return pkgs
 }

examples/pipe/main.go

@@ -58,7 +58,7 @@ type model struct {
 func newModel(initialValue string) (m model) {
 	i := textinput.New()
 	i.Prompt = ""
-	i.CursorStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("63"))
+	i.Cursor.Style = lipgloss.NewStyle().Foreground(lipgloss.Color("63"))
 	i.Width = 48
 	i.SetValue(initialValue)
 	i.CursorEnd()

examples/prevent-quit/main.go

@@ -61,7 +61,7 @@ func initialModel() model {
 
 	return model{
 		textarea: ti,
-		help:     help.NewModel(),
+		help:     help.New(),
 		keymap: keymap{
 			save: key.NewBinding(
 				key.WithKeys("ctrl+s"),

examples/progress-download/main.go

@@ -40,7 +40,7 @@ func (pw *progressWriter) Write(p []byte) (int, error) {
 }
 
 func getResponse(url string) (*http.Response, error) {
-	resp, err := http.Get(url)
+	resp, err := http.Get(url) // nolint:gosec
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -64,7 +64,7 @@ func main() {
 		fmt.Println("could not get response", err)
 		os.Exit(1)
 	}
-	defer resp.Body.Close()
+	defer resp.Body.Close() // nolint:errcheck
 
 	// Don't add TUI if the header doesn't include content size
 	// it's impossible see progress without total
@@ -79,7 +79,7 @@ func main() {
 		fmt.Println("could not create file:", err)
 		os.Exit(1)
 	}
-	defer file.Close()
+	defer file.Close() // nolint:errcheck
 
 	pw := &progressWriter{
 		total:  int(resp.ContentLength),

examples/realtime/main.go

@@ -24,7 +24,7 @@ type responseMsg struct{}
 func listenForActivity(sub chan struct{}) tea.Cmd {
 	return func() tea.Msg {
 		for {
-			time.Sleep(time.Millisecond * time.Duration(rand.Int63n(900)+100))
+			time.Sleep(time.Millisecond * time.Duration(rand.Int63n(900)+100)) // nolint:gosec
 			sub <- struct{}{}
 		}
 	}
@@ -46,7 +46,7 @@ type model struct {
 
 func (m model) Init() tea.Cmd {
 	return tea.Batch(
-		spinner.Tick,
+		m.spinner.Tick,
 		listenForActivity(m.sub), // generate activity
 		waitForActivity(m.sub),   // wait for activity
 	)
@@ -78,8 +78,6 @@ func (m model) View() string {
 }
 
 func main() {
-	rand.Seed(time.Now().UTC().UnixNano())
-
 	p := tea.NewProgram(model{
 		sub:     make(chan struct{}),
 		spinner: spinner.New(),

examples/send-msg/main.go

@@ -53,7 +53,7 @@ func newModel() model {
 }
 
 func (m model) Init() tea.Cmd {
-	return spinner.Tick
+	return m.spinner.Tick
 }
 
 func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
@@ -100,14 +100,12 @@ func (m model) View() string {
 }
 
 func main() {
-	rand.Seed(time.Now().UTC().UnixNano())
-
 	p := tea.NewProgram(newModel())
 
 	// Simulate activity
 	go func() {
 		for {
-			pause := time.Duration(rand.Int63n(899)+100) * time.Millisecond
+			pause := time.Duration(rand.Int63n(899)+100) * time.Millisecond // nolint:gosec
 			time.Sleep(pause)
 
 			// Send the Bubble Tea program a message from outside the
@@ -129,5 +127,5 @@ func randomFood() string {
 		"a kohlrabi", "some spaghetti", "tacos", "a currywurst", "some curry",
 		"a sandwich", "some peanut butter", "some cashews", "some ramen",
 	}
-	return string(food[rand.Intn(len(food))])
+	return food[rand.Intn(len(food))] // nolint:gosec
 }

examples/stopwatch/main.go

@@ -91,7 +91,7 @@ func main() {
 				key.WithHelp("q", "quit"),
 			),
 		},
-		help: help.NewModel(),
+		help: help.New(),
 	}
 
 	m.keymap.start.SetEnabled(false)

examples/textinputs/main.go

@@ -8,6 +8,7 @@ import (
 	"os"
 	"strings"
 
+	"github.com/charmbracelet/bubbles/cursor"
 	"github.com/charmbracelet/bubbles/textinput"
 	tea "github.com/charmbracelet/bubbletea"
 	"github.com/charmbracelet/lipgloss"
@@ -28,7 +29,7 @@ var (
 type model struct {
 	focusIndex int
 	inputs     []textinput.Model
-	cursorMode textinput.CursorMode
+	cursorMode cursor.Mode
 }
 
 func initialModel() model {
@@ -39,7 +40,7 @@ func initialModel() model {
 	var t textinput.Model
 	for i := range m.inputs {
 		t = textinput.New()
-		t.CursorStyle = cursorStyle
+		t.Cursor.Style = cursorStyle
 		t.CharLimit = 32
 
 		switch i {
@@ -77,12 +78,12 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		// Change cursor mode
 		case "ctrl+r":
 			m.cursorMode++
-			if m.cursorMode > textinput.CursorHide {
+			if m.cursorMode > cursor.CursorHide {
-				m.cursorMode = textinput.CursorBlink
+				m.cursorMode = cursor.CursorBlink
 			}
 			cmds := make([]tea.Cmd, len(m.inputs))
 			for i := range m.inputs {
-				cmds[i] = m.inputs[i].SetCursorMode(m.cursorMode)
+				cmds[i] = m.inputs[i].Cursor.SetMode(m.cursorMode)
 			}
 			return m, tea.Batch(cmds...)
 

examples/timer/main.go

@@ -111,7 +111,7 @@ func main() {
 				key.WithHelp("q", "quit"),
 			),
 		},
-		help: help.NewModel(),
+		help: help.New(),
 	}
 	m.keymap.start.SetEnabled(false)
 

examples/tui-daemon-combo/main.go

@@ -19,8 +19,6 @@ import (
 var helpStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("241")).Render
 
 func main() {
-	rand.Seed(time.Now().UTC().UnixNano())
-
 	var (
 		daemonMode bool
 		showHelp   bool
@@ -77,7 +75,7 @@ func newModel() model {
 func (m model) Init() tea.Cmd {
 	log.Println("Starting work...")
 	return tea.Batch(
-		spinner.Tick,
+		m.spinner.Tick,
 		runPretendProcess,
 	)
 }
@@ -128,12 +126,12 @@ type processFinishedMsg time.Duration
 
 // pretendProcess simulates a long-running process.
 func runPretendProcess() tea.Msg {
-	pause := time.Duration(rand.Int63n(899)+100) * time.Millisecond
+	pause := time.Duration(rand.Int63n(899)+100) * time.Millisecond // nolint:gosec
 	time.Sleep(pause)
 	return processFinishedMsg(pause)
 }
 
 func randomEmoji() string {
 	emojis := []rune("🍦🧋🍡🤠👾😭🦊🐯🦆🥨🎏🍔🍒🍥🎮📦🦁🐶🐸🍕🥐🧲🚒🥇🏆🌽")
-	return string(emojis[rand.Intn(len(emojis))])
+	return string(emojis[rand.Intn(len(emojis))]) // nolint:gosec
 }

examples/views/main.go

@@ -216,7 +216,7 @@ func chosenView(m model) string {
 		label = fmt.Sprintf("Downloaded. Exiting in %s seconds...", colorFg(strconv.Itoa(m.Ticks), "79"))
 	}
 
-	return msg + "\n\n" + label + "\n" + progressbar(80, m.Progress) + "%"
+	return msg + "\n\n" + label + "\n" + progressbar(m.Progress) + "%"
 }
 
 func checkbox(label string, checked bool) string {
@@ -226,7 +226,7 @@ func checkbox(label string, checked bool) string {
 	return fmt.Sprintf("[ ] %s", label)
 }
 
-func progressbar(width int, percent float64) string {
+func progressbar(percent float64) string {
 	w := float64(progressBarWidth)
 
 	fullSize := int(math.Round(w * percent))
@@ -253,14 +253,6 @@ func makeFgStyle(color string) func(string) string {
 	return termenv.Style{}.Foreground(term.Color(color)).Styled
 }
 
-// Color a string's foreground and background with the given value.
-func makeFgBgStyle(fg, bg string) func(string) string {
-	return termenv.Style{}.
-		Foreground(term.Color(fg)).
-		Background(term.Color(bg)).
-		Styled
-}
-
 // Generate a blend of colors.
 func makeRamp(colorA, colorB string, steps float64) (s []string) {
 	cA, _ := colorful.Hex(colorA)

tutorials/commands/main.go

@@ -22,7 +22,7 @@ func checkServer() tea.Msg {
 	if err != nil {
 		return errMsg{err}
 	}
-	defer res.Body.Close()
+	defer res.Body.Close() // nolint:errcheck
 
 	return statusMsg(res.StatusCode)
 }