Add custom .golangci.yaml config.

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

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 != "" {
+	if filePath != "" {
-		err = k.Load(file.Provider(path), yaml.Parser())
+		err = k.Load(file.Provider(filePath), yaml.Parser())
 		if err != nil {
 			return
 		}
 	}
-	err = k.Unmarshal("", &all)
+	err = k.Unmarshal("", &r)
-	if err != nil {
-		return
-	}
 
 	return
 }
 
-var Default All
+var Default Root
 
-type All struct {
+type Root struct {
-	Defaults Data                    `koanf:"defaults"`
+	Defaults Asset                    `koanf:"defaults"`
-	Assets   map[coindesk.Asset]Data `koanf:"assets"`
+	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) {
+func (r Root) ForAsset(a coindesk.Asset) (cfg Asset) {
-	data, ok := all.Assets[asset]
+	cfg = merge(r.Assets[a], r.Defaults)
-	if !ok {
+	cfg.Asset = a
-		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
-	}
 	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:
@@ -44,6 +50,11 @@ 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

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)
+			return c.project(ctx, m, now)
-			nextDay := c.StartingDate.Add(time.Hour * 24)
-			resp, err := coindesk.GetPriceValues(ctx,
-				m.Asset, c.StartingDate, nextDay)
-			if err != nil {
-				return err
-			}
-			if len(resp.Data.Entries) == 0 {
-				c.Projections.Dates = nil
-				return nil
-			}
-			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)
-			c.Projections = ProjectDates(
-				now, float64(m.CurrentPrice),
-				c.CDPR, m.Goals,
-			)
-			return nil
 		})
 	}
 	err = tasks.Wait()
@@ -115,46 +96,49 @@ type Column struct {
 	Projections   Projection
 }
 
-func (c *Column) Column() (entries []string) {
+func (c *Column) project(ctx context.Context, m *Math, now time.Time) (err error) {
-	entries = append(entries, fmt.Sprintf("$%.2f", c.StartingPrice))
+	err = c.fillStartingPrice(ctx, m.Asset, now)
-	entries = append(entries, fmt.Sprintf("%.2f%%", (c.CDPR-1)*100))
+	if err != nil {
-	never := c.CDPR <= 1
+		return
-	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)
 	}
+
+	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{
+func (c *Column) fillStartingPrice(
-	{"$100k", 100000},
+	ctx context.Context, asset coindesk.Asset, now time.Time,
-	{"$150k", 150000},
+) error {
-	{"$200k", 200000},
+	// if base provides a hardcoded starting price, use it
-	{"$250k", 250000},
+	c.StartingDate = c.Base.From(now)
-	{"$300k", 300000},
+	c.StartingPrice = coindesk.Price(c.Base.GetStartingPrice())
-	{"$500k", 500000},
+	if c.StartingPrice != 0 {
-	{"$1m", 1000000},
+		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{
+var errEmptyPriceEntries = errors.New("price values response has no entries")
-	{"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},
-}
 
 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"`
+	Name          string    `koanf:"name"`
-	Time time.Time `koanf:"time"`
+	Time          time.Time `koanf:"time"`
+	StartingPrice float64   `koanf:"startingPrice"`
 }
 
 func (cb ConstantBase) From(_ time.Time) time.Time {
@@ -181,7 +167,11 @@ 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"`
@@ -195,3 +185,7 @@ func (rb RelativeBase) From(now time.Time) time.Time {
 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
 }

tui/asset/asset.go

@@ -30,7 +30,7 @@ type Msg struct {
 	inner tea.Msg
 }
 
-func New(cfg config.Data) (m Model) {
+func New(cfg config.Asset) (m Model) {
 	m.math = moon.NewMath(
 		cfg.Asset,
 		cfg.Goals,
@@ -89,10 +89,6 @@ func New(cfg config.Data) (m Model) {
 	return
 }
 
-func (m Model) Handles(a coindesk.Asset) bool {
-	return m.math.Asset == a
-}
-
 func (m Model) Init() tea.Cmd {
 	return tea.Batch(
 		m.indicator.Tick,
@@ -102,6 +98,10 @@ func (m Model) Init() tea.Cmd {
 	)
 }
 
+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:
@@ -112,18 +112,19 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 			return m, tea.Batch(
 				m.resumeIndicator,
 				m.refresh,
+				m.scheduleRefresh(),
 			)
 		case update:
-			commands := []tea.Cmd{m.scheduleRefresh()}
+			var cmd tea.Cmd
 			if msg.err == nil {
 				m.math = msg.math
 				refillProperties(&m)
 				refillProjections(&m)
-				commands = append(commands, m.stopIndicator())
+				cmd = m.stopIndicator()
 			} else {
 				m.indicator.Style = indicatorErrorStyle
 			}
-			return m, tea.Batch(commands...)
+			return m, cmd
 		case stopIndicator:
 			m.refreshing = false
 			return m, nil
@@ -147,9 +148,9 @@ type update struct {
 type stopIndicator struct{}
 
 func (m Model) refresh() tea.Msg {
-	ctx, cancel := context.WithDeadline(
+	ctx, cancel := context.WithTimeout(
 		context.Background(),
-		time.Now().Add(time.Second*15))
+		refreshTimeout)
 	defer cancel()
 	err := m.math.Refresh(ctx)
 	if err != nil {
@@ -166,7 +167,7 @@ func (m Model) resumeIndicator() tea.Msg {
 }
 
 func (m Model) scheduleRefresh() tea.Cmd {
-	return tea.Tick(time.Second*30,
+	return tea.Tick(refreshInterval,
 		func(t time.Time) tea.Msg {
 			return Msg{m.math.Asset, refresh{}}
 		})
@@ -175,12 +176,16 @@ func (m Model) scheduleRefresh() tea.Cmd {
 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(time.Millisecond*500,
+	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)},
@@ -190,14 +195,34 @@ func refillProperties(m *Model) {
 }
 
 func refillProjections(m *Model) {
-	rows := []table.Row{m.math.Labels}
+	cols := []table.Row{m.math.Labels}
 	for i := range m.math.Columns {
-		rows = append(rows, m.math.Columns[i].Column())
+		entries := renderEntries(m.math.Columns[i])
+		cols = append(cols, entries)
 	}
-	rows = transpose(rows)
+	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)

tui/tui.go

@@ -17,17 +17,16 @@ type Model struct {
 	displayStats bool
 }
 
-func New(assets []coindesk.Asset, cfg config.All, displayStats bool) (m Model) {
+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 don't filter out dupes
+	// construct models for each asset, but remove dupes
 	seen := map[coindesk.Asset]struct{}{}
 	for _, a := range assets {
-		_, ok := seen[a]
+		if _, ok := seen[a]; ok {
-		if ok {
 			continue
 		}
-		assetCfg := cfg.GetData(a)
+		assetCfg := cfg.ForAsset(a)
 		assetModel := asset.New(assetCfg)
 		m.assets = append(m.assets, assetModel)
 		seen[a] = struct{}{}