Pause spinner ticks when not refreshing.

Also, add a quick-and-dirty model for displaying basic performance
stats, currently just the number of calls to the root Update() and
View() methods.

moonmath.go

@@ -9,11 +9,13 @@ import (
 	"code.humancabbage.net/sam/moonmath/config"
 	"code.humancabbage.net/sam/moonmath/tui"
 	"github.com/alecthomas/kong"
+	tea "github.com/charmbracelet/bubbletea"
 )
 
 var CLI struct {
 	Asset      []string `short:"a" default:"BTC" help:"Asset(s) to project."`
 	ConfigFile string   `short:"c" help:"Path to YAML configuration file."`
+	Perf       bool     `help:"Display internal performance stats."`
 }
 
 func main() {
@@ -30,7 +32,11 @@ func main() {
 		asset := coindesk.Asset(strings.ToUpper(CLI.Asset[i]))
 		assets = append(assets, asset)
 	}
-	p := tui.New(assets, allCfg)
+	m := tui.New(assets, allCfg, CLI.Perf)
+	p := tea.NewProgram(m,
+		tea.WithAltScreen(),
+		tea.WithFPS(30),
+	)
 	if _, err := p.Run(); err != nil {
 		fail(err)
 	}

tui/asset/asset.go

@@ -108,11 +108,16 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 		switch msg := msg.inner.(type) {
 		case refresh:
 			m.refreshing = true
-			return m, func() tea.Msg {
+			return m, tea.Batch(
+				func() tea.Msg {
+					return m.indicator.Tick()
+				},
+				func() tea.Msg {
 					// TODO: log errors
 					_ = m.math.Refresh(context.TODO())
 					return Msg{m.math.Asset, m.math}
-			}
+				},
+			)
 		case moon.Math:
 			m.math = msg
 			refillProperties(&m)
@@ -135,6 +140,9 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 			return m, nil
 		}
 	case spinner.TickMsg:
+		if !m.refreshing {
+			return m, nil
+		}
 		var cmd tea.Cmd
 		m.indicator, cmd = m.indicator.Update(msg)
 		return m, cmd

tui/perf/perf.go

@@ -0,0 +1,42 @@
+package perf
+
+import (
+	"fmt"
+	"sync/atomic"
+
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+type Model struct {
+	updates *atomic.Int64
+	views   *atomic.Int64
+}
+
+func New() (m Model) {
+	m.updates = new(atomic.Int64)
+	m.views = new(atomic.Int64)
+	return
+}
+
+func (m Model) Init() tea.Cmd {
+	return nil
+}
+
+func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
+	return m, nil
+}
+
+func (m Model) View() string {
+	updates := m.updates.Load()
+	views := m.views.Load()
+	s := fmt.Sprintf("updates: %d\tviews: %d", updates, views)
+	return s
+}
+
+func (m Model) AddUpdate() {
+	m.updates.Add(1)
+}
+
+func (m Model) AddView() {
+	m.views.Add(1)
+}

tui/tui.go

@@ -6,25 +6,20 @@ import (
 	"code.humancabbage.net/sam/moonmath/coindesk"
 	"code.humancabbage.net/sam/moonmath/config"
 	"code.humancabbage.net/sam/moonmath/tui/asset"
+	"code.humancabbage.net/sam/moonmath/tui/perf"
 	tea "github.com/charmbracelet/bubbletea"
 	"github.com/charmbracelet/lipgloss"
 )
 
 type Model struct {
 	assets       []asset.Model
+	stats        perf.Model
+	displayStats bool
 }
 
-func New(assets []coindesk.Asset, cfg config.All) (p *tea.Program) {
-	model := newModel(assets, cfg)
-	p = tea.NewProgram(
-		model,
-		tea.WithAltScreen(),
-		tea.WithFPS(30),
-	)
-	return
-}
-
-func newModel(assets []coindesk.Asset, cfg config.All) (m Model) {
+func New(assets []coindesk.Asset, cfg config.All, displayStats bool) (m Model) {
+	m.stats = perf.New()
+	m.displayStats = displayStats
 	// construct models for each asset, but don't filter out dupes
 	seen := map[coindesk.Asset]struct{}{}
 	for _, a := range assets {
@@ -52,6 +47,7 @@ func (m Model) Init() tea.Cmd {
 }
 
 func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	m.stats.AddUpdate()
 	switch msg := msg.(type) {
 	// handle keys for quitting
 	case tea.KeyMsg:
@@ -78,11 +74,15 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 }
 
 func (m Model) View() string {
+	m.stats.AddView()
 	var ss []string
 	for i := range m.assets {
 		s := m.assets[i].View()
 		ss = append(ss, s)
 	}
+	if m.displayStats {
+		ss = append(ss, m.stats.View())
+	}
 	r := lipgloss.JoinVertical(lipgloss.Center, ss...)
 	return r
 }