Keep y-offset in bounds when setting content

This actually uncovered a few ineffective assignments, particularly
in deleteWordRight.

.golangci.yml

@@ -14,6 +14,7 @@ linters:
     - godot
     - godox
     - goimports
+    - golint
     - gomnd
     - goprintffuncname
     - gosec

go.mod

@@ -4,11 +4,11 @@ go 1.13
 
 require (
 	github.com/atotto/clipboard v0.1.2
-	github.com/charmbracelet/bubbletea v0.12.2
-	github.com/lucasb-eyer/go-colorful v1.0.3
-	github.com/mattn/go-runewidth v0.0.9
-	github.com/muesli/reflow v0.2.0
-	github.com/muesli/termenv v0.7.4
+	github.com/charmbracelet/bubbletea v0.13.1
+	github.com/charmbracelet/lipgloss v0.1.2
+	github.com/lucasb-eyer/go-colorful v1.2.0
+	github.com/mattn/go-runewidth v0.0.12
+	github.com/muesli/reflow v0.2.1-0.20210115123740-9e1d0d53df68
+	github.com/muesli/termenv v0.8.1
 	golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897 // indirect
-	golang.org/x/sys v0.0.0-20201020230747-6e5568b54d1a // indirect
 )

go.sum

@@ -1,27 +1,32 @@
 github.com/atotto/clipboard v0.1.2 h1:YZCtFu5Ie8qX2VmVTBnrqLSiU9XOWwqNRmdT3gIQzbY=
 github.com/atotto/clipboard v0.1.2/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
-github.com/charmbracelet/bubbletea v0.12.2 h1:y9Yo2Pv8tcm3mAJsWONGsmHhzrbNxJVxpVtemikxE9A=
-github.com/charmbracelet/bubbletea v0.12.2/go.mod h1:3gZkYELUOiEUOp0bTInkxguucy/xRbGSOcbMs1geLxg=
+github.com/charmbracelet/bubbletea v0.13.1 h1:huvX8mPaeMZ8DLulT50iEWRF+iitY5FNEDqDVLu69nM=
+github.com/charmbracelet/bubbletea v0.13.1/go.mod h1:tp9tr9Dadh0PLhgiwchE5zZJXm5543JYjHG9oY+5qSg=
+github.com/charmbracelet/lipgloss v0.1.2 h1:D+LUMg34W7n2pkuMrevKVxT7HXqnoRHm7IoomkX3/ZU=
+github.com/charmbracelet/lipgloss v0.1.2/go.mod h1:5D8zradw52m7QmxRF6QgwbwJi9je84g8MkWiGN07uKg=
 github.com/containerd/console v1.0.1 h1:u7SFAJyRqWcG6ogaMAx3KjSTy1e3hT9QxqX7Jco7dRc=
 github.com/containerd/console v1.0.1/go.mod h1:XUsP6YE/mKtz6bxc+I8UiKKTP04qjQL4qcS3XoQ5xkw=
-github.com/google/goterm v0.0.0-20190703233501-fc88cf888a3f h1:5CjVwnuUcp5adK4gmY6i72gpVFVnZDP2h5TmPScB6u4=
 github.com/google/goterm v0.0.0-20190703233501-fc88cf888a3f/go.mod h1:nOFQdrUlIlx6M6ODdSpBj1NVA+VgLC6kmw60mkw34H4=
-github.com/lucasb-eyer/go-colorful v1.0.3 h1:QIbQXiugsb+q10B+MI+7DI1oQLdmnep86tWFlaaUAac=
 github.com/lucasb-eyer/go-colorful v1.0.3/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
+github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
+github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
-github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0=
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
-github.com/muesli/reflow v0.2.0 h1:2o0UBJPHHH4fa2GCXU4Rg4DwOtWPMekCeyc5EWbAQp0=
-github.com/muesli/reflow v0.2.0/go.mod h1:qT22vjVmM9MIUeLgsVYe/Ye7eZlbv9dZjL3dVhUqLX8=
-github.com/muesli/termenv v0.7.2 h1:r1raklL3uKE7rOvWgSenmEm2px+dnc33OTisZ8YR1fw=
+github.com/mattn/go-runewidth v0.0.10/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=
+github.com/mattn/go-runewidth v0.0.12 h1:Y41i/hVW3Pgwr8gV+J23B9YEY0zxjptBuCWEaxmAOow=
+github.com/mattn/go-runewidth v0.0.12/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=
+github.com/muesli/reflow v0.2.1-0.20210115123740-9e1d0d53df68 h1:y1p/ycavWjGT9FnmSjdbWUlLGvcxrY0Rw3ATltrxOhk=
+github.com/muesli/reflow v0.2.1-0.20210115123740-9e1d0d53df68/go.mod h1:Xk+z4oIWdQqJzsxyjgl3P22oYZnHdZ8FFTHAQQt5BMQ=
 github.com/muesli/termenv v0.7.2/go.mod h1:ct2L5N2lmix82RaY3bMWwVu/jUFc9Ule0KGDCiKYPh8=
-github.com/muesli/termenv v0.7.4 h1:/pBqvU5CpkY53tU0vVn+xgs2ZTX63aH5nY+SSps5Xa8=
-github.com/muesli/termenv v0.7.4/go.mod h1:pZ7qY9l3F7e5xsAOS0zCew2tME+p7bWeBkotCEcIIcc=
+github.com/muesli/termenv v0.8.1 h1:9q230czSP3DHVpkaPDXGp0TOfAwyjyYwXlUCQxQSaBk=
+github.com/muesli/termenv v0.8.1/go.mod h1:kzt/D/4a88RoheZmwfqorY3A+tnsSMA9HJC/fQSFKo0=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20201012173705-84dcc777aaee h1:4yd7jl+vXjalO5ztz6Vc1VADv+S/80LGJmyl1ROJ2AI=
 golang.org/x/crypto v0.0.0-20201012173705-84dcc777aaee/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897 h1:pLI5jrR7OSLijeIDcmRxNmw2api+jEfxLoykJVice/E=
 golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
@@ -30,8 +35,7 @@ golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200916030750-2334cc1a136f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634 h1:bNEHhJCnrwMKNMmOx3yAynp5vs5/gRy+XWFtZFu7NBM=
 golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201020230747-6e5568b54d1a h1:e3IU37lwO4aq3uoRKINC7JikojFmE5gO7xhfxs8VC34=
-golang.org/x/sys v0.0.0-20201020230747-6e5568b54d1a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4 h1:myAQVi0cGEoqQVR5POX+8RR2mrocKqNN1hmeMqhX27k=
+golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

paginator/paginator.go

@@ -1,4 +1,4 @@
-// package paginator provides a Bubble Tea package for calulating pagination
+// Package paginator provides a Bubble Tea package for calulating pagination
 // and rendering pagination info. Note that this package does not render actual
 // pages: it's purely for handling keystrokes related to pagination, and
 // rendering pagination status.
@@ -91,7 +91,7 @@ func (m *Model) NextPage() {
 	}
 }
 
-// LastPage returns whether or not we're on the last page.
+// OnLastPage returns whether or not we're on the last page.
 func (m Model) OnLastPage() bool {
 	return m.Page == m.TotalPages-1
 }

progress/progress.go

@@ -128,7 +128,7 @@ func NewModel(opts ...Option) (*Model, error) {
 func (m Model) View(percent float64) string {
 	b := strings.Builder{}
 	if m.ShowPercentage {
-		percentage := fmt.Sprintf(m.PercentFormat, percent*100)
+		percentage := fmt.Sprintf(m.PercentFormat, percent*100) //nolint:gomnd
 		if m.PercentageStyle != nil {
 			percentage = m.PercentageStyle.Styled(percentage)
 		}

spinner/spinner.go

@@ -5,58 +5,54 @@ import (
 	"time"
 
 	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
 	"github.com/muesli/reflow/ansi"
-	"github.com/muesli/termenv"
 )
 
-const defaultFPS = time.Second / 10
-
 // Spinner is a set of frames used in animating the spinner.
 type Spinner struct {
 	Frames []string
 	FPS    time.Duration
 }
 
+// Some spinners to choose from. You could also make your own.
 var (
-	// Some spinners to choose from. You could also make your own.
 	Line = Spinner{
 		Frames: []string{"|", "/", "-", "\\"},
-		FPS:    time.Second / 10,
+		FPS:    time.Second / 10, //nolint:gomnd
 	}
 	Dot = Spinner{
 		Frames: []string{"⣾ ", "⣽ ", "⣻ ", "⢿ ", "⡿ ", "⣟ ", "⣯ ", "⣷ "},
-		FPS:    time.Second / 10,
+		FPS:    time.Second / 10, //nolint:gomnd
 	}
 	MiniDot = Spinner{
 		Frames: []string{"⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"},
-		FPS:    time.Second / 12,
+		FPS:    time.Second / 12, //nolint:gomnd
 	}
 	Jump = Spinner{
 		Frames: []string{"⢄", "⢂", "⢁", "⡁", "⡈", "⡐", "⡠"},
-		FPS:    time.Second / 10,
+		FPS:    time.Second / 10, //nolint:gomnd
 	}
 	Pulse = Spinner{
 		Frames: []string{"█", "▓", "▒", "░"},
-		FPS:    time.Second / 8,
+		FPS:    time.Second / 8, //nolint:gomnd
 	}
 	Points = Spinner{
 		Frames: []string{"∙∙∙", "●∙∙", "∙●∙", "∙∙●"},
-		FPS:    time.Second / 7,
+		FPS:    time.Second / 7, //nolint:gomnd
 	}
 	Globe = Spinner{
 		Frames: []string{"🌍", "🌎", "🌏"},
-		FPS:    time.Second / 4,
+		FPS:    time.Second / 4, //nolint:gomnd
 	}
 	Moon = Spinner{
 		Frames: []string{"🌑", "🌒", "🌓", "🌔", "🌕", "🌖", "🌗", "🌘"},
-		FPS:    time.Second / 8,
+		FPS:    time.Second / 8, //nolint:gomnd
 	}
 	Monkey = Spinner{
 		Frames: []string{"🙈", "🙉", "🙊"},
-		FPS:    time.Second / 3,
+		FPS:    time.Second / 3, //nolint:gomnd
 	}
-
-	color = termenv.ColorProfile().Color
 )
 
 // Model contains the state for the spinner. Use NewModel to create new models
@@ -66,17 +62,12 @@ type Model struct {
 	// Spinner settings to use. See type Spinner.
 	Spinner Spinner
 
-	// ForegroundColor sets the background color of the spinner. It can be
-	// a hex code or one of the 256 ANSI colors. If the terminal emulator can't
-	// support the color specified it will automatically degrade (per
-	// github.com/muesli/termenv).
-	ForegroundColor string
-
-	// BackgroundColor sets the background color of the spinner. It can be
-	// a hex code or one of the 256 ANSI colors. If the terminal emulator can't
-	// support the color specified it will automatically degrade (per
-	// github.com/muesli/termenv).
-	BackgroundColor string
+	// Style sets the styling for the spinner. Most of the time you'll just
+	// want foreground and background coloring, and potentially some padding.
+	//
+	// For an introduction to styling with Lip Gloss see:
+	// https://github.com/charmbracelet/lipgloss
+	Style lipgloss.Style
 
 	// MinimumLifetime is the minimum amount of time the spinner can run. Any
 	// logic around this can be implemented in view that implements this
@@ -232,15 +223,7 @@ func (m Model) View() string {
 		frame = strings.Repeat(" ", ansi.PrintableRuneWidth(frame))
 	}
 
-	if m.ForegroundColor != "" || m.BackgroundColor != "" {
-		return termenv.
-			String(frame).
-			Foreground(color(m.ForegroundColor)).
-			Background(color(m.BackgroundColor)).
-			String()
-	}
-
-	return frame
+	return m.Style.Render(frame)
 }
 
 // Tick is the command used to advance the spinner one frame. Use this command

textinput/textinput.go

@@ -8,15 +8,12 @@ import (
 
 	"github.com/atotto/clipboard"
 	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
 	rw "github.com/mattn/go-runewidth"
-	"github.com/muesli/termenv"
 )
 
 const defaultBlinkSpeed = time.Millisecond * 530
 
-// color is a helper for returning colors.
-var color func(s string) termenv.Color = termenv.ColorProfile().Color
-
 // blinkMsg and blinkCanceled are used to manage cursor blinking.
 type blinkMsg struct{}
 type blinkCanceled struct{}
@@ -61,17 +58,23 @@ const (
 type Model struct {
 	Err error
 
-	// General settings
-	Prompt           string
-	Placeholder      string
-	Cursor           string
-	BlinkSpeed       time.Duration
-	TextColor        string
-	BackgroundColor  string
-	PlaceholderColor string
-	CursorColor      string
-	EchoMode         EchoMode
-	EchoCharacter    rune
+	// General settings.
+	Prompt        string
+	Placeholder   string
+	Cursor        string
+	BlinkSpeed    time.Duration
+	EchoMode      EchoMode
+	EchoCharacter rune
+
+	// Styles. These will be applied as inline styles.
+	//
+	// For an introduction to styling with Lip Gloss see:
+	// https://github.com/charmbracelet/lipgloss
+	PromptStyle      lipgloss.Style
+	TextStyle        lipgloss.Style
+	BackgroundStyle  lipgloss.Style
+	PlaceholderStyle lipgloss.Style
+	CursorStyle      lipgloss.Style
 
 	// CharLimit is the maximum amount of characters this input element will
 	// accept. If 0 or less, there's no limit.
@@ -111,13 +114,10 @@ type Model struct {
 func NewModel() Model {
 	return Model{
 		Prompt:           "> ",
-		Placeholder:      "",
 		BlinkSpeed:       defaultBlinkSpeed,
-		TextColor:        "",
-		PlaceholderColor: "240",
-		CursorColor:      "",
 		EchoCharacter:    '*',
 		CharLimit:        0,
+		PlaceholderStyle: lipgloss.NewStyle().Foreground(lipgloss.Color("240")),
 
 		value:      nil,
 		focus:      false,
@@ -139,7 +139,7 @@ func (m *Model) SetValue(s string) {
 	} else {
 		m.value = runes
 	}
-	if m.pos > len(m.value) {
+	if m.pos == 0 || m.pos > len(m.value) {
 		m.SetCursor(len(m.value))
 	}
 	m.handleOverflow()
@@ -202,7 +202,7 @@ func (m *Model) Reset() bool {
 
 // handle a clipboard paste event, if supported. Returns whether or not the
 // cursor blink should be reset.
-func (m *Model) handlePaste(v string) (blink bool) {
+func (m *Model) handlePaste(v string) bool {
 	paste := []rune(v)
 
 	var availSpace int
@@ -212,7 +212,7 @@ func (m *Model) handlePaste(v string) (blink bool) {
 
 	// If the char limit's been reached cancel
 	if m.CharLimit > 0 && availSpace <= 0 {
-		return
+		return false
 	}
 
 	// If there's not enough space to paste the whole thing cut the pasted
@@ -291,35 +291,15 @@ func (m *Model) handleOverflow() {
 	}
 }
 
-// colorText colorizes a given string according to the TextColor value of the
-// model.
-func (m *Model) colorText(s string) string {
-	return termenv.
-		String(s).
-		Foreground(color(m.TextColor)).
-		Background(color(m.BackgroundColor)).
-		String()
-}
-
-// colorPlaceholder colorizes a given string according to the TextColor value
-// of the model.
-func (m *Model) colorPlaceholder(s string) string {
-	return termenv.
-		String(s).
-		Foreground(color(m.PlaceholderColor)).
-		Background(color(m.BackgroundColor)).
-		String()
-}
-
 // deleteWordLeft deletes the word left to the cursor. Returns whether or not
 // the cursor blink should be reset.
-func (m *Model) deleteWordLeft() (blink bool) {
+func (m *Model) deleteWordLeft() bool {
 	if m.pos == 0 || len(m.value) == 0 {
-		return
+		return false
 	}
 
 	i := m.pos
-	blink = m.SetCursor(m.pos - 1)
+	blink := m.SetCursor(m.pos - 1)
 	for unicode.IsSpace(m.value[m.pos]) {
 		// ignore series of whitespace before cursor
 		blink = m.SetCursor(m.pos - 1)
@@ -343,26 +323,26 @@ func (m *Model) deleteWordLeft() (blink bool) {
 		m.value = append(m.value[:m.pos], m.value[i:]...)
 	}
 
-	return
+	return blink
 }
 
 // deleteWordRight deletes the word right to the cursor. Returns whether or not
 // the cursor blink should be reset.
-func (m *Model) deleteWordRight() (blink bool) {
+func (m *Model) deleteWordRight() bool {
 	if m.pos >= len(m.value) || len(m.value) == 0 {
-		return
+		return false
 	}
 
 	i := m.pos
-	blink = m.SetCursor(m.pos + 1)
+	m.SetCursor(m.pos + 1)
 	for unicode.IsSpace(m.value[m.pos]) {
 		// ignore series of whitespace after cursor
-		blink = m.SetCursor(m.pos + 1)
+		m.SetCursor(m.pos + 1)
 	}
 
 	for m.pos < len(m.value) {
 		if !unicode.IsSpace(m.value[m.pos]) {
-			blink = m.SetCursor(m.pos + 1)
+			m.SetCursor(m.pos + 1)
 		} else {
 			break
 		}
@@ -373,20 +353,19 @@ func (m *Model) deleteWordRight() (blink bool) {
 	} else {
 		m.value = append(m.value[:i], m.value[m.pos:]...)
 	}
-	blink = m.SetCursor(i)
 
-	return
+	return m.SetCursor(i)
 }
 
 // wordLeft moves the cursor one word to the left. Returns whether or not the
 // cursor blink should be reset.
-func (m *Model) wordLeft() (blink bool) {
+func (m *Model) wordLeft() bool {
 	if m.pos == 0 || len(m.value) == 0 {
-		return
+		return false
 	}
 
+	blink := false
 	i := m.pos - 1
-
 	for i >= 0 {
 		if unicode.IsSpace(m.value[i]) {
 			blink = m.SetCursor(m.pos - 1)
@@ -405,18 +384,18 @@ func (m *Model) wordLeft() (blink bool) {
 		}
 	}
 
-	return
+	return blink
 }
 
 // wordRight moves the cursor one word to the right. Returns whether or not the
 // cursor blink should be reset.
-func (m *Model) wordRight() (blink bool) {
+func (m *Model) wordRight() bool {
 	if m.pos >= len(m.value) || len(m.value) == 0 {
-		return
+		return false
 	}
 
+	blink := false
 	i := m.pos
-
 	for i < len(m.value) {
 		if unicode.IsSpace(m.value[i]) {
 			blink = m.SetCursor(m.pos + 1)
@@ -435,7 +414,7 @@ func (m *Model) wordRight() (blink bool) {
 		}
 	}
 
-	return
+	return blink
 }
 
 func (m Model) echoTransform(v string) string {
@@ -565,13 +544,15 @@ func (m Model) View() string {
 		return m.placeholderView()
 	}
 
+	styleText := m.TextStyle.Inline(true).Render
+
 	value := m.value[m.offset:m.offsetRight]
 	pos := max(0, m.pos-m.offset)
-	v := m.colorText(m.echoTransform(string(value[:pos])))
+	v := styleText(m.echoTransform(string(value[:pos])))
 
 	if pos < len(value) {
-		v += m.cursorView(m.echoTransform(string(value[pos])))   // cursor and text under it
-		v += m.colorText(m.echoTransform(string(value[pos+1:]))) // text after cursor
+		v += m.cursorView(m.echoTransform(string(value[pos]))) // cursor and text under it
+		v += styleText(m.echoTransform(string(value[pos+1:]))) // text after cursor
 	} else {
 		v += m.cursorView(" ")
 	}
@@ -579,56 +560,44 @@ func (m Model) View() string {
 	// If a max width and background color were set fill the empty spaces with
 	// the background color.
 	valWidth := rw.StringWidth(string(value))
-	if m.Width > 0 && len(m.BackgroundColor) > 0 && valWidth <= m.Width {
+	if m.Width > 0 && valWidth <= m.Width {
 		padding := max(0, m.Width-valWidth)
 		if valWidth+padding <= m.Width && pos < len(value) {
 			padding++
 		}
-		v += strings.Repeat(
-			termenv.String(" ").Background(color(m.BackgroundColor)).String(),
-			padding,
-		)
+		v += styleText(strings.Repeat(" ", padding))
 	}
 
-	return m.Prompt + v
+	return m.PromptStyle.Render(m.Prompt) + v
 }
 
 // placeholderView returns the prompt and placeholder view, if any.
 func (m Model) placeholderView() string {
 	var (
-		v string
-		p = m.Placeholder
+		v     string
+		p     = m.Placeholder
+		style = m.PlaceholderStyle.Inline(true).Render
 	)
 
 	// Cursor
-	if m.blink && m.PlaceholderColor != "" {
-		v += m.cursorView(m.colorPlaceholder(p[:1]))
+	if m.blink {
+		v += m.cursorView(style(p[:1]))
 	} else {
 		v += m.cursorView(p[:1])
 	}
 
 	// The rest of the placeholder text
-	v += m.colorPlaceholder(p[1:])
+	v += style(p[1:])
 
-	return m.Prompt + v
+	return m.PromptStyle.Render(m.Prompt) + v
 }
 
 // cursorView styles the cursor.
 func (m Model) cursorView(v string) string {
 	if m.blink {
-		if m.TextColor != "" || m.BackgroundColor != "" {
-			return termenv.String(v).
-				Foreground(color(m.TextColor)).
-				Background(color(m.BackgroundColor)).
-				String()
-		}
-		return v
+		return m.TextStyle.Render(v)
 	}
-	return termenv.String(v).
-		Foreground(color(m.CursorColor)).
-		Background(color(m.BackgroundColor)).
-		Reverse().
-		String()
+	return m.CursorStyle.Inline(true).Reverse(true).Render(v)
 }
 
 // blinkCmd is an internal command used to manage cursor blinking.

viewport/viewport.go

@@ -7,10 +7,12 @@ import (
 	tea "github.com/charmbracelet/bubbletea"
 )
 
-const spacebar = " "
-
-// MODEL
+const (
+	spacebar        = " "
+	mouseWheelDelta = 3
+)
 
+// Model is the Bubble Tea model for this viewport element.
 type Model struct {
 	Width  int
 	Height int
@@ -52,7 +54,7 @@ func (m Model) PastBottom() bool {
 	return m.YOffset > len(m.lines)-1-m.Height
 }
 
-// Scrollpercent returns the amount scrolled as a float between 0 and 1.
+// ScrollPercent returns the amount scrolled as a float between 0 and 1.
 func (m Model) ScrollPercent() float64 {
 	if m.Height >= len(m.lines) {
 		return 1.0
@@ -69,6 +71,10 @@ func (m Model) ScrollPercent() float64 {
 func (m *Model) SetContent(s string) {
 	s = strings.Replace(s, "\r\n", "\n", -1) // normalize line endings
 	m.lines = strings.Split(s, "\n")
+
+	if m.YOffset > len(m.lines)-1 {
+		m.GotoBottom()
+	}
 }
 
 // Return the lines that should currently be visible in the viewport.
@@ -215,7 +221,7 @@ func (m *Model) GotoTop() (lines []string) {
 	return lines
 }
 
-// GotoTop sets the viewport to the bottom position.
+// GotoBottom sets the viewport to the bottom position.
 func (m *Model) GotoBottom() (lines []string) {
 	m.YOffset = max(len(m.lines)-1-m.Height, 0)
 
@@ -333,13 +339,13 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 	case tea.MouseMsg:
 		switch msg.Type {
 		case tea.MouseWheelUp:
-			lines := m.LineUp(3)
+			lines := m.LineUp(mouseWheelDelta)
 			if m.HighPerformanceRendering {
 				cmd = ViewUp(m, lines)
 			}
 
 		case tea.MouseWheelDown:
-			lines := m.LineDown(3)
+			lines := m.LineDown(mouseWheelDelta)
 			if m.HighPerformanceRendering {
 				cmd = ViewDown(m, lines)
 			}