Switch to GoLand.

The Coindesk API doesn't have data going all the way back. But since history
isn't changing, we can simply put in known prices.

Also, extend the CDPR cells to have four digits instead of just two.

.golangci.yaml

@@ -0,0 +1,15 @@
+linters:
+  disable-all: true
+  enable:
+  - errcheck
+  - godot
+  - goimports
+  - gosimple
+  - govet
+  - ineffassign
+  - nilerr
+  - nilnil
+  - staticcheck
+  - typecheck
+  - unused
+  - usestdlibvars

.idea/.gitignore

@@ -0,0 +1 @@
+workspace.xml

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/moonmath.iml" filepath="$PROJECT_DIR$/.idea/moonmath.iml" />
+    </modules>
+  </component>
+</project>

.idea/moonmath.iml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="Go" enabled="true" />
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

.vscode/launch.json

@@ -1,20 +0,0 @@
-{
-    // Use IntelliSense to learn about possible attributes.
-    // Hover to view descriptions of existing attributes.
-    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
-    "version": "0.2.0",
-    "configurations": [
-        {
-            "name": "Launch",
-            "type": "go",
-            "request": "launch",
-            "mode": "debug",
-            "console": "integratedTerminal",
-            "program": "${workspaceFolder}/moonmath.go",
-            "args": [
-                "--config-file",
-                "moonmath.toml"
-            ]
-        }
-    ]
-}

.vscode/settings.json

@@ -1,18 +0,0 @@
-{
-    "cSpell.words": [
-        "alecthomas",
-        "bitcoinity",
-        "Bitfinex",
-        "Bitstamp",
-        "bubbletea",
-        "CDPR",
-        "charmbracelet",
-        "Coindesk",
-        "knadh",
-        "koanf",
-        "lipgloss",
-        "moonmath",
-        "OHLC",
-        "sourcegraph"
-    ]
-}

README.md

@@ -12,14 +12,27 @@ program. It's written in Go using the [Bubble Tea][tea] library, and uses
 [tea]: https://github.com/charmbracelet/bubbletea
 [coin]: https://www.coindesk.com
 
+### Installation
+
+Go to the [Releases page](https://code.humancabbage.net/sam/moonmath/releases)
+and download the archive for your operating system and architecture. (For the
+uninitiated, "Darwin" means macOS.)
+
 ### Configuration
 
-By default, the program will use Bitcoin along with various goals and bases
-of comparison. With the `--asset` flag, another asset supported by Coindesk can
-be chosen. The [builtin default config](./config/default.yaml) only has special
-goals for Ethereum ("ETH"). With the `--config-file` flag, however, one can
-specify a YAML file that overrides these defaults and adds goals for other
-assets.
+By default, the program will use Bitcoin along with various goals and bases of
+comparison. With the `--asset` flag, another asset supported by Coindesk can be
+chosen. These can even be chained, e.g. `--asset BTC --asset ETH`, to show
+projections for multiple assets simultaneously.
+
+The [builtin default config](./config/default.yaml) only has special
+goals a handful of the most popular assets. With the `--config-file` flag,
+however, one can specify a YAML file that overrides these defaults and adds
+goals for other assets.
+
+Check out [coindesk/assets.go](./coindesk/assets.go) for a full list of
+supported assets. Keep in mind these have not been exhaustively tested, and
+it's likely that many will fail with the default configuration settings.
 
 ### "Theory"
 

coindesk/assets.go

@@ -1,5 +1,6 @@
 package coindesk
 
+//goland:noinspection ALL
 const (
 	BTC      Asset = "BTC"
 	ETH      Asset = "ETH"

config/config.go

@@ -16,62 +16,58 @@ import (
 
 var k = koanf.New(".")
 
-func Load(path string) (all All, err error) {
+func Load(filePath string) (r Root, err error) {
 	err = k.Load(structs.Provider(Default, "koanf"), nil)
 	if err != nil {
 		return
 	}
-	if path != "" {
-		err = k.Load(file.Provider(path), yaml.Parser())
+	if filePath != "" {
+		err = k.Load(file.Provider(filePath), yaml.Parser())
 		if err != nil {
 			return
 		}
 	}
-	err = k.Unmarshal("", &all)
-	if err != nil {
-		return
-	}
+	err = k.Unmarshal("", &r)
 
 	return
 }
 
-var Default All
+var Default Root
 
-type All struct {
-	Defaults Data                    `koanf:"defaults"`
-	Assets   map[coindesk.Asset]Data `koanf:"assets"`
+type Root struct {
+	Defaults Asset                    `koanf:"defaults"`
+	Assets   map[coindesk.Asset]Asset `koanf:"assets"`
 }
 
-type Data struct {
+type Asset struct {
 	Asset         coindesk.Asset      `koanf:"asset"`
 	Goals         []moon.Goal         `koanf:"goals"`
 	ConstantBases []moon.ConstantBase `koanf:"constantBases"`
 	RelativeBases []moon.RelativeBase `koanf:"relativeBases"`
 }
 
-func (all All) GetData(asset coindesk.Asset) (data Data, err error) {
-	data, ok := all.Assets[asset]
-	if !ok {
-		data = all.Defaults
-	}
-	if data.Asset == "" {
-		data.Asset = asset
-	}
-	if data.Goals == nil || len(data.Goals) == 0 {
-		data.Goals = all.Defaults.Goals
-	}
-	if data.ConstantBases == nil || len(data.ConstantBases) == 0 {
-		data.ConstantBases = all.Defaults.ConstantBases
-	}
-	if data.RelativeBases == nil || len(data.RelativeBases) == 0 {
-		data.RelativeBases = all.Defaults.RelativeBases
-	}
+func (r Root) ForAsset(a coindesk.Asset) (cfg Asset) {
+	cfg = merge(r.Assets[a], r.Defaults)
+	cfg.Asset = a
 	return
 }
 
+func merge(dst, src Asset) Asset {
+	if len(dst.Goals) == 0 {
+		dst.Goals = src.Goals
+	}
+	if len(dst.ConstantBases) == 0 {
+		dst.ConstantBases = src.ConstantBases
+	}
+	if len(dst.RelativeBases) == 0 {
+		dst.RelativeBases = src.RelativeBases
+	}
+	return dst
+}
+
 // GetBases returns the concatenation of the constant and relative bases, sorted
 // from most recent to least recent in time.
-func GetBases(d *Data) (bases []moon.Base) {
+func GetBases(d *Asset) (bases []moon.Base) {
 	for _, b := range d.ConstantBases {
 		bases = append(bases, b)
 	}

config/default.yaml

@@ -28,6 +28,12 @@ defaults:
     time: 2019-12-31T16:00:00-08:00
   - name: 2017-
     time: 2016-12-31T16:00:00-08:00
+  - name: 2013-
+    time: 2012-12-31T16:00:00-08:00
+    startingPrice: 13.30
+  - name: 2011-
+    time: 2010-12-31T16:00:00-08:00
+    startingPrice: 0.30
 
 assets:
   ETH:
@@ -44,3 +50,93 @@ assets:
       value: 20000
     - name: $25k
       value: 25000
+    constantBases:
+    - name: 2020-
+      time: 2019-12-31T16:00:00-08:00
+    - name: 2017-
+      time: 2016-12-31T16:00:00-08:00
+  LTC:
+    goals:
+    - name: $100
+      value: 100
+    - name: $150
+      value: 150
+    - name: $200
+      value: 200
+    - name: $300
+      value: 300
+    - name: $500
+      value: 500
+    - name: $1k
+      value: 1000
+    constantBases:
+    - name: 2021-
+      time: 2020-12-31T16:00:00-08:00
+  SOL:
+    goals:
+    - name: $250
+      value: 250
+    - name: $375
+      value: 375
+    - name: $500
+      value: 500
+    - name: $750
+      value: 750
+    - name: $1k
+      value: 1000
+    - name: $2k
+      value: 2000
+    constantBases:
+    - name: 2022-
+      time: 2021-12-31T16:00:00-08:00
+  XRP:
+    goals:
+    - name: $1
+      value: 1
+    - name: $1.5
+      value: 1.5
+    - name: $2
+      value: 2
+    - name: $3
+      value: 3
+    - name: $5
+      value: 5
+    - name: $10
+      value: 10
+    constantBases:
+    - name: 2022-
+      time: 2021-12-31T16:00:00-08:00
+  DOGE:
+    goals:
+    - name: $1
+      value: 1
+    - name: $1.5
+      value: 1.5
+    - name: $2
+      value: 2
+    - name: $3
+      value: 3
+    - name: $5
+      value: 5
+    - name: $10
+      value: 10
+    constantBases:
+    - name: 2022-
+      time: 2021-12-31T16:00:00-08:00
+  ADA:
+    goals:
+    - name: $1
+      value: 1
+    - name: $1.5
+      value: 1.5
+    - name: $2
+      value: 2
+    - name: $3
+      value: 3
+    - name: $5
+      value: 5
+    - name: $10
+      value: 10
+    constantBases:
+    - name: 2022-
+      time: 2021-12-31T16:00:00-08:00

go.mod

@@ -36,8 +36,7 @@ require (
 	github.com/muesli/reflow v0.3.0 // indirect
 	github.com/muesli/termenv v0.15.2 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
-	go.uber.org/atomic v1.7.0 // indirect
-	go.uber.org/multierr v1.9.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/sync v0.6.0 // indirect
 	golang.org/x/sys v0.18.0 // indirect
 	golang.org/x/term v0.18.0 // indirect

go.sum

@@ -17,7 +17,6 @@ github.com/charmbracelet/lipgloss v0.10.0/go.mod h1:Wig9DSfvANsxqkRsqj6x87irdy12
 github.com/containerd/console v1.0.4 h1:F2g4+oChYvBTsASRTz8NP6iIAi97J3TtSAsLbIFn4ro=
 github.com/containerd/console v1.0.4/go.mod h1:YynlIjWYF8myEu6sdkwKIvGQq+cOckRm6So2avqoYAk=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/fatih/structs v1.1.0 h1:Q7juDM0QtcnhCpeyLGQKyg4TOIghuNXrkL32pHAUMxo=
@@ -75,14 +74,10 @@ github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZV
 github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
 github.com/sourcegraph/conc v0.3.0 h1:OQTbbt6P72L20UqAkXXuLOj79LfEanQ+YQFNpLA9ySo=
 github.com/sourcegraph/conc v0.3.0/go.mod h1:Sdozi7LEKbFPqYX2/J+iBAM6HpqSLTASQIKqDmF7Mt0=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
-go.uber.org/atomic v1.7.0 h1:ADUqmZGgLDDfbSL9ZmPxKTybcoEYHgpYfELNoN+7hsw=
-go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
-go.uber.org/multierr v1.9.0 h1:7fIwc/ZtS0q++VgcfqFDxSBZVv/Xo49/SYnDFupUwlI=
-go.uber.org/multierr v1.9.0/go.mod h1:X2jQV1h+kxSjClGpnseKVIxpmcjrj7MNnI0bnlfKTVQ=
+go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
+go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
 golang.org/x/net v0.22.0 h1:9sGLhx7iRIHEiX0oAJ3MRZMUCElJgy7Br1nO+AMN3Tc=
 golang.org/x/net v0.22.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=
 golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=

moon/moon.go

@@ -2,6 +2,7 @@ package moon
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"math"
 	"time"
@@ -75,30 +76,10 @@ func (m *Math) Refresh(ctx context.Context) (err error) {
 	tasks.WithMaxGoroutines(len(m.Columns))
 	//tasks.WithMaxGoroutines(1)
 	now := time.Now()
-
 	for i := range m.Columns {
 		c := &m.Columns[i]
 		tasks.Go(func() error {
-			c.StartingDate = c.Base.From(now)
-			nextDay := c.StartingDate.Add(time.Hour * 24)
-			resp, err := coindesk.GetPriceValues(ctx,
-				m.Asset, c.StartingDate, nextDay)
-			if err != nil {
-				return err
-			}
-			c.StartingPrice = resp.Data.Entries[0].Price
-			c.Gain = float64(m.CurrentPrice) / float64(c.StartingPrice)
-			days := now.Sub(c.StartingDate).Hours() / 24
-			c.CDPR = CDPR(days, c.Gain)
-			if c.CDPR > 1 {
-				c.Projections = ProjectDates(
-					now, float64(m.CurrentPrice),
-					c.CDPR, m.Goals,
-				)
-			} else {
-				c.Projections.Dates = nil
-			}
-			return nil
+			return c.project(ctx, m, now)
 		})
 	}
 	err = tasks.Wait()
@@ -115,46 +96,49 @@ type Column struct {
 	Projections   Projection
 }
 
-func (c *Column) Column() (entries []string) {
-	entries = append(entries, fmt.Sprintf("$%.2f", c.StartingPrice))
-	entries = append(entries, fmt.Sprintf("%.2f%%", (c.CDPR-1)*100))
-	never := c.CDPR <= 1
-	for i := range c.Projections.Dates {
-		var cell string
-		if never {
-			cell = "NEVER!!!!!"
-		} else {
-			cell = c.
-				Projections.
-				Dates[i].
-				Format("2006-01-02")
-		}
-		entries = append(entries, cell)
+func (c *Column) project(ctx context.Context, m *Math, now time.Time) (err error) {
+	err = c.fillStartingPrice(ctx, m.Asset, now)
+	if err != nil {
+		return
 	}
+
+	c.Gain = float64(m.CurrentPrice) / float64(c.StartingPrice)
+	days := now.Sub(c.StartingDate).Hours() / 24
+	c.CDPR = CDPR(days, c.Gain)
+	c.Projections = ProjectDates(
+		now, float64(m.CurrentPrice),
+		c.CDPR, m.Goals,
+	)
 	return
 }
 
-var DefaultGoals = []Goal{
-	{"$100k", 100000},
-	{"$150k", 150000},
-	{"$200k", 200000},
-	{"$250k", 250000},
-	{"$300k", 300000},
-	{"$500k", 500000},
-	{"$1m", 1000000},
+func (c *Column) fillStartingPrice(
+	ctx context.Context, asset coindesk.Asset, now time.Time,
+) error {
+	// if base provides a hardcoded starting price, use it
+	c.StartingDate = c.Base.From(now)
+	c.StartingPrice = coindesk.Price(c.Base.GetStartingPrice())
+	if c.StartingPrice != 0 {
+		return nil
+	}
+
+	// otherwise, look up the starting price via Coindesk
+	nextDay := c.StartingDate.Add(time.Hour * 24)
+	resp, err := coindesk.GetPriceValues(ctx, asset, c.StartingDate, nextDay)
+	if err != nil {
+		err = fmt.Errorf("getting price for %s on %v: %w",
+			asset, c.StartingDate, err)
+		return err
+	}
+	if len(resp.Data.Entries) == 0 {
+		c.Projections.Dates = nil
+		return errEmptyPriceEntries
+	}
+	c.StartingPrice = resp.Data.Entries[0].Price
+	return nil
 }
 
-var DefaultConstantBases = []ConstantBase{
-	{"2020-", time.Unix(1577836800, 0)},
-	{"2017-", time.Unix(1483228800, 0)},
-}
-
-var DefaultRelativeBases = []RelativeBase{
-	{"Month", time.Duration(-30) * time.Hour * 24},
-	{"Quarter", time.Duration(-90) * time.Hour * 24},
-	{"Half-Year", time.Duration(-182) * time.Hour * 24},
-	{"Year", time.Duration(-365) * time.Hour * 24},
-}
+var errEmptyPriceEntries = errors.New("price values response has no entries")
 
 type Goal struct {
 	Name  string  `koanf:"name"`
@@ -165,12 +149,14 @@ type Goal struct {
 type Base interface {
 	From(now time.Time) time.Time
 	Label() string
+	GetStartingPrice() float64
 }
 
 // ConstantBase is a base that is a constant time, e.g. 2020-01-01.
 type ConstantBase struct {
-	Name string    `koanf:"name"`
-	Time time.Time `koanf:"time"`
+	Name          string    `koanf:"name"`
+	Time          time.Time `koanf:"time"`
+	StartingPrice float64   `koanf:"startingPrice"`
 }
 
 func (cb ConstantBase) From(_ time.Time) time.Time {
@@ -181,17 +167,25 @@ func (cb ConstantBase) Label() string {
 	return cb.Name
 }
 
-// RelativeBase is a base that is relative, e.g. "90 days ago."
+func (cb ConstantBase) GetStartingPrice() float64 {
+	return cb.StartingPrice
+}
+
+// RelativeBase is a base that is relative, e.g. "90 days ago".
 type RelativeBase struct {
 	Name   string        `koanf:"name"`
 	Offset time.Duration `koanf:"offset"`
 }
 
 func (rb RelativeBase) From(now time.Time) time.Time {
-	then := now.Add(time.Duration(rb.Offset))
+	then := now.Add(rb.Offset)
 	return then
 }
 
 func (rb RelativeBase) Label() string {
 	return rb.Name
 }
+
+func (rb RelativeBase) GetStartingPrice() float64 {
+	return 0
+}

moon/moon_test.go

@@ -11,6 +11,14 @@ func TestCDPR(t *testing.T) {
 }
 
 func TestProjection(t *testing.T) {
-	p := moon.ProjectDates(time.Now(), 68900, 1.0055, moon.DefaultGoals)
+	p := moon.ProjectDates(time.Now(), 68900, 1.0055, []moon.Goal{
+		{"$100k", 100000},
+		{"$150k", 150000},
+		{"$200k", 200000},
+		{"$250k", 250000},
+		{"$300k", 300000},
+		{"$500k", 500000},
+		{"$1m", 1000000},
+	})
 	_ = p
 }

moonmath.go

@@ -2,21 +2,30 @@ package main
 
 import (
 	"fmt"
+	"io"
+	"log/slog"
 	"os"
+	"path/filepath"
 	"strings"
 
 	"code.humancabbage.net/sam/moonmath/coindesk"
 	"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 to project."`
-	ConfigFile string `short:"c" help:"Path to YAML configuration file."`
+	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() {
+	logFile := setupLogging()
+	defer func() {
+		_ = logFile.Close()
+	}()
 	ctx := kong.Parse(&CLI)
 	if ctx.Error != nil {
 		fail(ctx.Error)
@@ -25,17 +34,50 @@ func main() {
 	if err != nil {
 		fail(err)
 	}
-	CLI.Asset = strings.ToUpper(CLI.Asset)
-	cfg, err := allCfg.GetData(coindesk.Asset(CLI.Asset))
-	if err != nil {
-		fail(err)
+	var assets []coindesk.Asset
+	for i := range CLI.Asset {
+		asset := coindesk.Asset(strings.ToUpper(CLI.Asset[i]))
+		assets = append(assets, asset)
 	}
-	p := tui.New(cfg)
+	m := tui.New(assets, allCfg, CLI.Perf)
+	p := tea.NewProgram(m,
+		tea.WithAltScreen(),
+		tea.WithFPS(30),
+	)
 	if _, err := p.Run(); err != nil {
 		fail(err)
 	}
 }
 
+func setupLogging() io.Closer {
+	homePath, err := os.UserHomeDir()
+	if err != nil {
+		panic(err)
+	}
+
+	programConfigPath := filepath.Join(homePath, ".moonmath")
+	err = os.MkdirAll(programConfigPath, 0755)
+	if err != nil {
+		panic(err)
+	}
+
+	errLogPath := filepath.Join(programConfigPath, "errors.log")
+	errLogFile, err := os.OpenFile(
+		errLogPath,
+		os.O_CREATE|os.O_APPEND|os.O_WRONLY,
+		0600,
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	slog.SetDefault(slog.New(
+		slog.NewTextHandler(errLogFile, &slog.HandlerOptions{
+			Level: slog.LevelError,
+		})))
+	return errLogFile
+}
+
 func fail(err error) {
 	fmt.Printf("program error: %v\n", err)
 	os.Exit(1)

tui/asset/asset.go

@@ -0,0 +1,268 @@
+package asset
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"time"
+
+	"code.humancabbage.net/sam/moonmath/coindesk"
+	"code.humancabbage.net/sam/moonmath/config"
+	"code.humancabbage.net/sam/moonmath/moon"
+	"github.com/charmbracelet/bubbles/spinner"
+	"github.com/charmbracelet/bubbles/table"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+)
+
+type Model struct {
+	math moon.Math
+
+	refreshing bool
+	indicator  spinner.Model
+
+	properties  table.Model
+	projections table.Model
+}
+
+type Msg struct {
+	Asset coindesk.Asset
+	inner tea.Msg
+}
+
+func New(cfg config.Asset) (m Model) {
+	m.math = moon.NewMath(
+		cfg.Asset,
+		cfg.Goals,
+		config.GetBases(&cfg),
+	)
+
+	tableStyle := table.DefaultStyles()
+	tableStyle.Selected = tableStyle.Cell.Copy().
+		Padding(0)
+	tableStyle.Header = tableStyle.Header.
+		Bold(true).
+		Foreground(lipgloss.Color("214")).
+		Border(baseStyle.GetBorderStyle(), false, false, true, false)
+
+	// properties table
+
+	m.properties = table.New(
+		table.WithColumns([]table.Column{
+			{Title: "Property", Width: 9},
+			{Title: "Value", Width: 9},
+		}),
+		table.WithHeight(2),
+		table.WithStyles(tableStyle),
+	)
+
+	// projections table
+
+	labelsWidth := 0
+	for _, l := range m.math.Labels {
+		if len(l) > labelsWidth {
+			labelsWidth = len(l)
+		}
+	}
+	projectionCols := []table.Column{
+		{Title: "Labels", Width: labelsWidth},
+	}
+	for _, c := range m.math.Columns {
+		projectionCols = append(projectionCols,
+			table.Column{
+				Title: c.Base.Label(),
+				Width: 10,
+			})
+	}
+	m.projections = table.New(
+		table.WithColumns(projectionCols),
+		table.WithHeight(len(m.math.Labels)),
+		table.WithStyles(tableStyle),
+	)
+
+	// indicator spinner
+
+	m.indicator = spinner.New()
+	m.indicator.Spinner = spinner.Points
+	m.indicator.Style = indicatorNormalStyle
+
+	return
+}
+
+func (m Model) Init() tea.Cmd {
+	return tea.Batch(
+		m.indicator.Tick,
+		func() tea.Msg {
+			return Msg{m.math.Asset, refresh{}}
+		},
+	)
+}
+
+func (m Model) Handles(a coindesk.Asset) bool {
+	return m.math.Asset == a
+}
+
+func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case Msg:
+		switch msg := msg.inner.(type) {
+		case refresh:
+			m.refreshing = true
+			m.indicator.Style = indicatorNormalStyle
+			return m, tea.Batch(
+				m.resumeIndicator,
+				m.refresh,
+				m.scheduleRefresh(),
+			)
+		case update:
+			var cmd tea.Cmd
+			if msg.err == nil {
+				m.math = msg.math
+				refillProperties(&m)
+				refillProjections(&m)
+				cmd = m.stopIndicator()
+			} else {
+				m.indicator.Style = indicatorErrorStyle
+			}
+			return m, cmd
+		case stopIndicator:
+			m.refreshing = false
+			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
+	}
+	return m, nil
+}
+
+type refresh struct{}
+type update struct {
+	math moon.Math
+	err  error
+}
+type stopIndicator struct{}
+
+func (m Model) refresh() tea.Msg {
+	ctx, cancel := context.WithTimeout(
+		context.Background(),
+		refreshTimeout)
+	defer cancel()
+	err := m.math.Refresh(ctx)
+	if err != nil {
+		slog.Error("refresh",
+			"asset", m.math.Asset,
+			"err", err,
+		)
+	}
+	return Msg{m.math.Asset, update{m.math, err}}
+}
+
+func (m Model) resumeIndicator() tea.Msg {
+	return m.indicator.Tick()
+}
+
+func (m Model) scheduleRefresh() tea.Cmd {
+	return tea.Tick(refreshInterval,
+		func(t time.Time) tea.Msg {
+			return Msg{m.math.Asset, refresh{}}
+		})
+}
+
+func (m Model) stopIndicator() tea.Cmd {
+	// wait a bit to stop the indicator, so that it's more obvious
+	// even when the refresh completes quickly.
+	return tea.Tick(stopIndicatorDelay,
+		func(t time.Time) tea.Msg {
+			return Msg{m.math.Asset, stopIndicator{}}
+		})
+}
+
+var refreshInterval = time.Second * 30
+var refreshTimeout = time.Second * 15
+var stopIndicatorDelay = time.Millisecond * 500
+
+func refillProperties(m *Model) {
+	rows := []table.Row{
+		{"Asset", string(m.math.Asset)},
+		{"Price", fmt.Sprintf("$%0.2f", m.math.CurrentPrice)},
+	}
+	m.properties.SetRows(rows)
+}
+
+func refillProjections(m *Model) {
+	cols := []table.Row{m.math.Labels}
+	for i := range m.math.Columns {
+		entries := renderEntries(m.math.Columns[i])
+		cols = append(cols, entries)
+	}
+	rows := transpose(cols)
+	m.projections.SetRows(rows)
+}
+
+func renderEntries(c moon.Column) (entries []string) {
+	entries = append(entries, fmt.Sprintf("$%.2f", c.StartingPrice))
+	entries = append(entries, fmt.Sprintf("%.4f%%", (c.CDPR-1)*100))
+	never := c.CDPR <= 1
+	for i := range c.Projections.Dates {
+		var cell string
+		if never {
+			cell = "NEVER!!!!!"
+		} else {
+			cell = c.
+				Projections.
+				Dates[i].
+				Format("2006-01-02")
+		}
+		entries = append(entries, cell)
+	}
+	return
+}
+
+func transpose(slice []table.Row) []table.Row {
+	xl := len(slice[0])
+	yl := len(slice)
+	result := make([]table.Row, xl)
+	for i := range result {
+		result[i] = make(table.Row, yl)
+	}
+	for i := 0; i < xl; i++ {
+		for j := 0; j < yl; j++ {
+			result[i][j] = slice[j][i]
+		}
+	}
+	return result
+}
+
+func (m Model) View() string {
+	var s string
+	indicator := ""
+	if m.refreshing {
+		indicator = m.indicator.View()
+	}
+	right := lipgloss.JoinVertical(
+		lipgloss.Center,
+		baseStyle.Render(m.properties.View()),
+		indicator,
+	)
+	s += lipgloss.JoinHorizontal(
+		lipgloss.Center,
+		right,
+		baseStyle.Render(m.projections.View()),
+	)
+	return s + "\n"
+}
+
+var baseStyle = lipgloss.NewStyle().
+	BorderStyle(lipgloss.RoundedBorder()).
+	BorderForeground(lipgloss.Color("240"))
+
+var indicatorNormalStyle = lipgloss.NewStyle().
+	Foreground(lipgloss.Color("69"))
+
+var indicatorErrorStyle = lipgloss.NewStyle().
+	Foreground(lipgloss.Color("160"))

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(_ 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

@@ -1,202 +1,99 @@
 package tui
 
 import (
-	"context"
 	"fmt"
-	"time"
 
+	"code.humancabbage.net/sam/moonmath/coindesk"
 	"code.humancabbage.net/sam/moonmath/config"
-	"code.humancabbage.net/sam/moonmath/moon"
-	"github.com/charmbracelet/bubbles/spinner"
-	"github.com/charmbracelet/bubbles/table"
+	"code.humancabbage.net/sam/moonmath/tui/asset"
+	"code.humancabbage.net/sam/moonmath/tui/perf"
 	tea "github.com/charmbracelet/bubbletea"
 	"github.com/charmbracelet/lipgloss"
 )
 
-func New(cfg config.Data) (p *tea.Program) {
-	p = tea.NewProgram(
-		newModel(cfg),
-		tea.WithAltScreen(),
-		tea.WithFPS(30),
-	)
-	return
-}
-
 type Model struct {
-	math moon.Math
-
-	refreshing bool
-	indicator  spinner.Model
-
-	properties  table.Model
-	projections table.Model
+	assets       []asset.Model
+	stats        perf.Model
+	displayStats bool
 }
 
-func newModel(cfg config.Data) (m Model) {
-	m.math = moon.NewMath(
-		cfg.Asset,
-		cfg.Goals,
-		config.GetBases(&cfg),
-	)
-
-	tableStyle := table.DefaultStyles()
-	tableStyle.Selected = tableStyle.Cell.Copy().
-		Padding(0)
-	tableStyle.Header = tableStyle.Header.
-		Bold(true).
-		Foreground(lipgloss.Color("214")).
-		Border(baseStyle.GetBorderStyle(), false, false, true, false)
-
-	// properties table
-
-	m.properties = table.New(
-		table.WithColumns([]table.Column{
-			{Title: "Property", Width: 9},
-			{Title: "Value", Width: 9},
-		}),
-		table.WithHeight(2),
-		table.WithStyles(tableStyle),
-	)
-
-	// projections table
-
-	labelsWidth := 0
-	for _, l := range m.math.Labels {
-		if len(l) > labelsWidth {
-			labelsWidth = len(l)
+func New(assets []coindesk.Asset, cfg config.Root, displayStats bool) (m Model) {
+	m.stats = perf.New()
+	m.displayStats = displayStats
+	// construct models for each asset, but remove dupes
+	seen := map[coindesk.Asset]struct{}{}
+	for _, a := range assets {
+		if _, ok := seen[a]; ok {
+			continue
 		}
+		assetCfg := cfg.ForAsset(a)
+		assetModel := asset.New(assetCfg)
+		m.assets = append(m.assets, assetModel)
+		seen[a] = struct{}{}
 	}
-	projectionCols := []table.Column{
-		{Title: "Labels", Width: labelsWidth},
-	}
-	for _, c := range m.math.Columns {
-		projectionCols = append(projectionCols,
-			table.Column{
-				Title: c.Base.Label(),
-				Width: 10,
-			})
-	}
-	m.projections = table.New(
-		table.WithColumns(projectionCols),
-		table.WithHeight(len(m.math.Labels)),
-		table.WithStyles(tableStyle),
-	)
-
-	// indicator spinner
-
-	m.indicator = spinner.New()
-	m.indicator.Spinner = spinner.Points
-	m.indicator.Style = lipgloss.NewStyle().
-		Foreground(lipgloss.Color("69"))
-
 	return
 }
 
 func (m Model) Init() tea.Cmd {
-	return tea.Batch(
-		m.indicator.Tick,
-		func() tea.Msg {
-			return refresh{}
-		},
-	)
+	// initialize child models, collecting their commands,
+	// then return them all in a batch
+	var inits []tea.Cmd
+	for i := range m.assets {
+		cmd := m.assets[i].Init()
+		inits = append(inits, cmd)
+	}
+	return tea.Batch(inits...)
 }
 
 func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	m.stats.AddUpdate()
 	switch msg := msg.(type) {
-	case refresh:
-		m.refreshing = true
-		return m, func() tea.Msg {
-			// TODO: log errors
-			_ = m.math.Refresh(context.TODO())
-			return m.math
-		}
-	case moon.Math:
-		m.math = msg
-		refillProperties(&m)
-		refillProjections(&m)
-		return m, tea.Batch(
-			// schedule the next refresh
-			tea.Tick(time.Second*30,
-				func(t time.Time) tea.Msg {
-					return refresh{}
-				}),
-			// wait a bit to stop the indicator, so that it's more obvious
-			// even when the refresh completes quickly.
-			tea.Tick(time.Millisecond*500,
-				func(t time.Time) tea.Msg {
-					return stopIndicator{}
-				}),
-		)
-	case stopIndicator:
-		m.refreshing = false
-		return m, nil
-	case spinner.TickMsg:
-		var cmd tea.Cmd
-		m.indicator, cmd = m.indicator.Update(msg)
-		return m, cmd
+	// handle keys for quitting
 	case tea.KeyMsg:
 		switch msg.String() {
 		case "ctrl+c", "q", "esc":
 			return m, tea.Quit
 		}
+	// forward asset messages to the appropriate model
+	case asset.Msg:
+		cmd := m.forward(msg.Asset, msg)
+		return m, cmd
+	// forward any other message to each child model.
+	// typically, this is for animation.
+	default:
+		var commands []tea.Cmd
+		for i := range m.assets {
+			var cmd tea.Cmd
+			m.assets[i], cmd = m.assets[i].Update(msg)
+			commands = append(commands, cmd)
+		}
+		return m, tea.Batch(commands...)
 	}
 	return m, nil
 }
 
-type refresh struct{}
-type stopIndicator struct{}
-
-func refillProperties(m *Model) {
-	rows := []table.Row{
-		{"Asset", string(m.math.Asset)},
-		{"Price", fmt.Sprintf("$%0.2f", m.math.CurrentPrice)},
-	}
-	m.properties.SetRows(rows)
-}
-
-func refillProjections(m *Model) {
-	rows := []table.Row{m.math.Labels}
-	for i := range m.math.Columns {
-		rows = append(rows, m.math.Columns[i].Column())
-	}
-	rows = transpose(rows)
-	m.projections.SetRows(rows)
-}
-
-func transpose(slice []table.Row) []table.Row {
-	xl := len(slice[0])
-	yl := len(slice)
-	result := make([]table.Row, xl)
-	for i := range result {
-		result[i] = make(table.Row, yl)
-	}
-	for i := 0; i < xl; i++ {
-		for j := 0; j < yl; j++ {
-			result[i][j] = slice[j][i]
-		}
-	}
-	return result
-}
-
 func (m Model) View() string {
-	var s string
-	indicator := ""
-	if m.refreshing {
-		indicator = m.indicator.View()
+	m.stats.AddView()
+	var ss []string
+	for i := range m.assets {
+		s := m.assets[i].View()
+		ss = append(ss, s)
 	}
-	right := lipgloss.JoinVertical(
-		lipgloss.Center,
-		baseStyle.Render(m.properties.View()),
-		indicator,
-	)
-	s += lipgloss.JoinHorizontal(
-		lipgloss.Center,
-		right,
-		baseStyle.Render(m.projections.View()),
-	)
-	return s + "\n"
+	if m.displayStats {
+		ss = append(ss, m.stats.View())
+	}
+	r := lipgloss.JoinVertical(lipgloss.Center, ss...)
+	return r
 }
 
-var baseStyle = lipgloss.NewStyle().
-	BorderStyle(lipgloss.RoundedBorder()).
-	BorderForeground(lipgloss.Color("240"))
+func (m Model) forward(a coindesk.Asset, msg tea.Msg) (cmd tea.Cmd) {
+	// O(n) is fine when n is small
+	for i := range m.assets {
+		if !m.assets[i].Handles(a) {
+			continue
+		}
+		m.assets[i], cmd = m.assets[i].Update(msg)
+		return
+	}
+	panic(fmt.Errorf("rogue message: %v", msg))
+}