Scale large numbers by adding Million Billion Trillion suffix (#200)

Add option for scaling Thousand Million Billion Trillion numbers by adding suffix.

cointop/coins_table.go

@@ -136,6 +136,9 @@ func (ct *Cointop) GetCoinsTable() *table.Table {
 					})
 			case "24h_volume":
 				text := humanize.Monetaryf(coin.Volume24H, 0)
+				if ct.IsActiveTableCompactNotation() {
+					text = humanize.ScaleNumericf(coin.Volume24H, 3)
+				}
 				ct.SetTableColumnWidthFromString(header, text)
 				ct.SetTableColumnAlignLeft(header, false)
 				rowCells = append(rowCells,
@@ -243,6 +246,9 @@ func (ct *Cointop) GetCoinsTable() *table.Table {
 					})
 			case "market_cap":
 				text := humanize.Monetaryf(coin.MarketCap, 0)
+				if ct.IsActiveTableCompactNotation() {
+					text = humanize.ScaleNumericf(coin.MarketCap, 3)
+				}
 				ct.SetTableColumnWidthFromString(header, text)
 				ct.SetTableColumnAlignLeft(header, false)
 				rowCells = append(rowCells,
@@ -255,6 +261,9 @@ func (ct *Cointop) GetCoinsTable() *table.Table {
 					})
 			case "total_supply":
 				text := humanize.Numericf(coin.TotalSupply, 0)
+				if ct.IsActiveTableCompactNotation() {
+					text = humanize.ScaleNumericf(coin.TotalSupply, 3)
+				}
 				ct.SetTableColumnWidthFromString(header, text)
 				ct.SetTableColumnAlignLeft(header, false)
 				rowCells = append(rowCells,
@@ -267,6 +276,9 @@ func (ct *Cointop) GetCoinsTable() *table.Table {
 					})
 			case "available_supply":
 				text := humanize.Numericf(coin.AvailableSupply, 0)
+				if ct.IsActiveTableCompactNotation() {
+					text = humanize.ScaleNumericf(coin.AvailableSupply, 3)
+				}
 				ct.SetTableColumnWidthFromString(header, text)
 				ct.SetTableColumnAlignLeft(header, false)
 				rowCells = append(rowCells,

cointop/cointop.go

@@ -89,6 +89,11 @@ type State struct {
 	priceAlerts                *PriceAlerts
 	priceAlertEditID           string
 	priceAlertNewID            string
+
+	compactNotation          bool
+	tableCompactNotation     bool
+	favoritesCompactNotation bool
+	portfolioCompactNotation bool
 }
 
 // Cointop cointop
@@ -181,6 +186,9 @@ var DefaultCurrency = "USD"
 // DefaultChartRange ...
 var DefaultChartRange = "1Y"
 
+// DefaultCompactNotation ...
+var DefaultCompactNotation = false
+
 // DefaultMaxChartWidth ...
 var DefaultMaxChartWidth = 175
 
@@ -291,6 +299,10 @@ func NewCointop(config *Config) (*Cointop, error) {
 				Entries:      make([]*PriceAlert, 0),
 				SoundEnabled: true,
 			},
+			compactNotation:          DefaultCompactNotation,
+			tableCompactNotation:     DefaultCompactNotation,
+			favoritesCompactNotation: DefaultCompactNotation,
+			portfolioCompactNotation: DefaultCompactNotation,
 		},
 		Views: &Views{
 			Chart:       NewChartView(),

cointop/config.go

@@ -48,6 +48,7 @@ type ConfigFileConfig struct {
 	Colorscheme       interface{}            `toml:"colorscheme"`
 	RefreshRate       interface{}            `toml:"refresh_rate"`
 	CacheDir          interface{}            `toml:"cache_dir"`
+	CompactNotation   interface{}            `toml:"compact_notation"`
 	Table             map[string]interface{} `toml:"table"`
 	Chart             map[string]interface{} `toml:"chart"`
 }
@@ -70,6 +71,7 @@ func (ct *Cointop) SetupConfig() error {
 		ct.loadColorschemeFromConfig,
 		ct.loadRefreshRateFromConfig,
 		ct.loadCacheDirFromConfig,
+		ct.loadCompactNotationFromConfig,
 		ct.loadPriceAlertsFromConfig,
 		ct.loadPortfolioFromConfig,
 	}
@@ -215,10 +217,11 @@ func (ct *Cointop) ConfigToToml() ([]byte, error) {
 	var favoritesBySymbolIfc []interface{}
 	favoritesMapIfc := map[string]interface{}{
 		// DEPRECATED: favorites by 'symbol' is deprecated because of collisions. Kept for backward compatibility.
-		"symbols":   favoritesBySymbolIfc,
-		"names":     favoritesIfc,
-		"columns":   ct.State.favoritesTableColumns,
-		"character": ct.State.favoriteChar,
+		"symbols":          favoritesBySymbolIfc,
+		"names":            favoritesIfc,
+		"columns":          ct.State.favoritesTableColumns,
+		"character":        ct.State.favoriteChar,
+		"compact_notation": ct.State.favoritesCompactNotation,
 	}
 
 	var holdingsIfc [][]string
@@ -236,8 +239,9 @@ func (ct *Cointop) ConfigToToml() ([]byte, error) {
 		return holdingsIfc[i][0] < holdingsIfc[j][0]
 	})
 	portfolioIfc := map[string]interface{}{
-		"holdings": holdingsIfc,
-		"columns":  ct.State.portfolioTableColumns,
+		"holdings":         holdingsIfc,
+		"columns":          ct.State.portfolioTableColumns,
+		"compact_notation": ct.State.portfolioCompactNotation,
 	}
 
 	cmcIfc := map[string]interface{}{
@@ -264,6 +268,7 @@ func (ct *Cointop) ConfigToToml() ([]byte, error) {
 	tableMapIfc := map[string]interface{}{
 		"columns":                ct.State.coinsTableColumns,
 		"keep_row_focus_on_sort": ct.State.keepRowFocusOnSort,
+		"compact_notation":       ct.State.tableCompactNotation,
 	}
 
 	chartMapIfc := map[string]interface{}{
@@ -286,6 +291,7 @@ func (ct *Cointop) ConfigToToml() ([]byte, error) {
 		CacheDir:          ct.State.cacheDir,
 		Table:             tableMapIfc,
 		Chart:             chartMapIfc,
+		CompactNotation:   ct.State.compactNotation,
 	}
 
 	var b bytes.Buffer
@@ -310,6 +316,11 @@ func (ct *Cointop) loadTableConfig() error {
 	if ok {
 		ct.State.keepRowFocusOnSort = keepRowFocusOnSortIfc.(bool)
 	}
+
+	if compactNotation, ok := ct.config.Table["compact_notation"]; ok {
+		ct.State.tableCompactNotation = compactNotation.(bool)
+	}
+
 	return nil
 }
 
@@ -458,6 +469,16 @@ func (ct *Cointop) loadCacheDirFromConfig() error {
 	return nil
 }
 
+// loadCompactNotationFromConfig loads compact-notation setting from config file to struct
+func (ct *Cointop) loadCompactNotationFromConfig() error {
+	log.Debug("loadCompactNotationFromConfig()")
+	if compactNotation, ok := ct.config.CompactNotation.(bool); ok {
+		ct.State.compactNotation = compactNotation
+	}
+
+	return nil
+}
+
 // LoadAPIChoiceFromConfig loads API choices from config file to struct
 func (ct *Cointop) loadAPIChoiceFromConfig() error {
 	log.Debug("loadAPIKeysFromConfig()")
@@ -480,6 +501,8 @@ func (ct *Cointop) loadFavoritesFromConfig() error {
 				}
 				ct.State.favoriteChar = favoriteChar
 			}
+		} else if k == "compact_notation" {
+			ct.State.favoritesCompactNotation = valueIfc.(bool)
 		}
 		ifcs, ok := valueIfc.([]interface{})
 		if !ok {
@@ -568,6 +591,8 @@ func (ct *Cointop) loadPortfolioFromConfig() error {
 					return err
 				}
 			}
+		} else if key == "compact_notation" {
+			ct.State.portfolioCompactNotation = valueIfc.(bool)
 		} else {
 			// Backward compatibility < v1.6.0
 			holdings, err := ct.InterfaceToFloat64(valueIfc)

cointop/marketbar.go

@@ -40,6 +40,9 @@ func (ct *Cointop) UpdateMarketbar() error {
 			total = math.Round(total*1e2) / 1e2
 			totalstr = humanize.Monetaryf(total, 2)
 		}
+		if ct.State.compactNotation {
+			totalstr = humanize.ScaleNumericf(total, 3)
+		}
 
 		timeframe := ct.State.selectedChartRange
 		chartname := ct.SelectedCoinName()
@@ -153,12 +156,19 @@ func (ct *Cointop) UpdateMarketbar() error {
 			separator2 = "\n" + offset
 		}
 
+		marketCapStr := humanize.Monetaryf(market.TotalMarketCapUSD, 0)
+		volumeStr := humanize.Monetaryf(market.Total24HVolumeUSD, 0)
+		if ct.State.compactNotation {
+			marketCapStr = humanize.ScaleNumericf(market.TotalMarketCapUSD, 3)
+			volumeStr = humanize.ScaleNumericf(market.Total24HVolumeUSD, 3)
+		}
+
 		content = fmt.Sprintf(
 			"%sGlobal ▶ Market Cap: %s %s 24H Volume: %s %s BTC Dominance: %.2f%%",
 			chartInfo,
-			fmt.Sprintf("%s%s", ct.CurrencySymbol(), humanize.Monetaryf(market.TotalMarketCapUSD, 0)),
+			fmt.Sprintf("%s%s", ct.CurrencySymbol(), marketCapStr),
 			separator1,
-			fmt.Sprintf("%s%s", ct.CurrencySymbol(), humanize.Monetaryf(market.Total24HVolumeUSD, 0)),
+			fmt.Sprintf("%s%s", ct.CurrencySymbol(), volumeStr),
 			separator2,
 			market.BitcoinPercentageOfMarketCap,
 		)

cointop/table_header.go

@@ -21,6 +21,7 @@ var ArrowDown = "▼"
 type HeaderColumn struct {
 	Slug       string
 	Label      string
+	ShortLabel string // only columns with a ShortLabel can be scaled?
 	PlainLabel string
 }
 
@@ -69,11 +70,13 @@ var HeaderColumns = map[string]*HeaderColumn{
 	"market_cap": {
 		Slug:       "market_cap",
 		Label:      "[m]arket cap",
+		ShortLabel: "[m]cap",
 		PlainLabel: "market cap",
 	},
 	"24h_volume": {
 		Slug:       "24h_volume",
 		Label:      "24H [v]olume",
+		ShortLabel: "24[v]",
 		PlainLabel: "24H volume",
 	},
 	"1h_change": {
@@ -104,11 +107,13 @@ var HeaderColumns = map[string]*HeaderColumn{
 	"total_supply": {
 		Slug:       "total_supply",
 		Label:      "[t]otal supply",
+		ShortLabel: "[t]ot",
 		PlainLabel: "total supply",
 	},
 	"available_supply": {
 		Slug:       "available_supply",
 		Label:      "[a]vailable supply",
+		ShortLabel: "[a]vl",
 		PlainLabel: "available supply",
 	},
 	"percent_holdings": {
@@ -123,6 +128,15 @@ var HeaderColumns = map[string]*HeaderColumn{
 	},
 }
 
+// GetLabel fetch the label to use for the heading (depends on configuration)
+func (ct *Cointop) GetLabel(h *HeaderColumn) string {
+	// TODO: technically this should support nosort
+	if ct.IsActiveTableCompactNotation() && h.ShortLabel != "" {
+		return h.ShortLabel
+	}
+	return h.Label
+}
+
 // TableHeaderView is structure for table header view
 type TableHeaderView = ui.View
 
@@ -145,6 +159,22 @@ func (ct *Cointop) GetActiveTableHeaders() []string {
 	return cols
 }
 
+// GetActiveTableHeaders returns the list of active table headers
+func (ct *Cointop) IsActiveTableCompactNotation() bool {
+	var compact bool
+	switch ct.State.selectedView {
+	case PortfolioView:
+		compact = ct.State.portfolioCompactNotation
+	case CoinsView:
+		compact = ct.State.tableCompactNotation
+	case FavoritesView:
+		compact = ct.State.favoritesCompactNotation
+	default:
+		compact = ct.State.tableCompactNotation
+	}
+	return compact
+}
+
 // UpdateTableHeader renders the table header
 func (ct *Cointop) UpdateTableHeader() error {
 	log.Debug("UpdateTableHeader()")
@@ -175,7 +205,7 @@ func (ct *Cointop) UpdateTableHeader() error {
 				}
 			}
 		}
-		label := hc.Label
+		label := ct.GetLabel(hc)
 		if noSort {
 			label = hc.PlainLabel
 		}
@@ -240,7 +270,7 @@ func (ct *Cointop) SetTableColumnWidth(header string, width int) {
 		prev = prevIfc.(int)
 	} else {
 		hc := HeaderColumns[header]
-		prev = utf8.RuneCountInString(hc.Label) + 1
+		prev = utf8.RuneCountInString(ct.GetLabel(hc)) + 1
 		switch header {
 		case "price", "balance":
 			prev++

docs/content/faq.md

@@ -357,6 +357,12 @@ draft: false
 
   Supported columns relating to price change are `1h_change`, `24h_change`, `7d_change`, `30d_change`, `1y_change`
 
+## How can I use K (thousand), M (million), B (billion), T (trillion) suffixes for shorter numbers?
+
+  There is a setting at the top-level of the configuration file called `compact_notation=true` which changes the marketbar values `market cap`, `volume` and `portfolio total value`.
+
+  The same setting can be applied at in the `[table]` section to impact the `24h_volume`, `market_cap`, `total_supply`, `available_supply` columns in the main coin view; and in the `[favorites]` section to change the same columns.   The setting also changes the column names to be shorter.
+
 ## How can use a different config file other than the default?
 
   Run cointop with the `--config` flag, eg `cointop --config="/path/to/config.toml"`, to use the specified file as the config.

pkg/humanize/humanize.go

@@ -2,6 +2,7 @@ package humanize
 
 import (
 	"fmt"
+	"math"
 	"os"
 	"strconv"
 	"strings"
@@ -12,7 +13,7 @@ import (
 
 // Numericf produces a string from of the given number with give fixed precision
 // in base 10 with thousands separators after every three orders of magnitude
-// using a thousands and decimal spearator according to LC_NUMERIC; defaulting "en".
+// using thousands and decimal separator according to LC_NUMERIC; defaulting "en".
 //
 // e.g. Numericf(834142.32, 2) -> "834,142.32"
 func Numericf(value float64, precision int) string {
@@ -21,16 +22,16 @@ func Numericf(value float64, precision int) string {
 
 // Monetaryf produces a string from of the given number give minimum precision
 // in base 10 with thousands separators after every three orders of magnitude
-// using thousands and decimal spearator according to LC_MONETARY; defaulting "en".
+// using thousands and decimal separator according to LC_MONETARY; defaulting "en".
 //
 // e.g. Monetaryf(834142.3256, 2) -> "834,142.3256"
 func Monetaryf(value float64, precision int) string {
 	return f(value, precision, "LC_MONETARY", false)
 }
 
-// f formats given value v, with d decimal places using thousands and decimal
+// f formats given value, with precision decimal places using thousands and decimal
 // separator according to language found in given locale environment variable e.
-// If r is true the decimal places are fixed to the given d otherwise d is the
+// If fixed is true the decimal places are fixed to the given precision otherwise d is the
 // minimum of decimal places until the first 0.
 func f(value float64, precision int, envvar string, fixed bool) string {
 	parts := strings.Split(strconv.FormatFloat(value, 'f', -1, 64), ".")
@@ -51,3 +52,47 @@ func f(value float64, precision int, envvar string, fixed bool) string {
 	format := fmt.Sprintf("%%.%df", precision)
 	return message.NewPrinter(lang).Sprintf(format, value)
 }
+
+// Scale returns a scaled-down version of value and a suffix to add (M,B,etc.)
+func Scale(value float64) (float64, string) {
+	type scalingUnit struct {
+		value  float64
+		suffix string
+	}
+
+	//  quadrillion, quintrillion, sextillion, septillion, octillion, nonillion, and decillion
+	var scales = [...]scalingUnit{
+		{value: 1e12, suffix: "T"},
+		{value: 1e9, suffix: "B"},
+		{value: 1e6, suffix: "M"},
+		{value: 1e3, suffix: "K"},
+	}
+
+	for _, scale := range scales {
+		if math.Abs(value) > scale.value {
+			return value / scale.value, scale.suffix
+		}
+	}
+	return value, ""
+}
+
+// ScaleNumericf scales a large number down using a suffix, then formats it with the
+// prescribed number of significant digits.
+func ScaleNumericf(value float64, digits int) string {
+	value, suffix := Scale(value)
+
+	// Round the scaled value to a certain number of significant figures
+	var s string
+	if math.Abs(value) < 1 {
+		s = Numericf(value, digits)
+	} else {
+		numDigits := len(fmt.Sprintf("%.0f", math.Abs(value)))
+		if numDigits >= digits {
+			s = Numericf(value, 0)
+		} else {
+			s = Numericf(value, digits-numDigits)
+		}
+	}
+
+	return s + suffix
+}

pkg/humanize/humanize_test.go

@@ -1,6 +1,7 @@
 package humanize
 
 import (
+	"fmt"
 	"testing"
 )
 
@@ -10,3 +11,43 @@ func TestMonetary(t *testing.T) {
 		t.FailNow()
 	}
 }
+
+func TestScale(t *testing.T) {
+	scaleTests := map[float64]string{
+		5.54 * 1e12:  "5.5T",
+		4.44 * 1e9:   "4.4B",
+		3.34 * 1e6:   "3.3M",
+		2.24 * 1e3:   "2.2K",
+		1.1:          "1.1",
+		0.06:         "0.1",
+		0.04:         "0.0",
+		-5.54 * 1e12: "-5.5T",
+	}
+
+	for value, expected := range scaleTests {
+		volScale, volSuffix := Scale(value)
+		result := fmt.Sprintf("%.1f%s", volScale, volSuffix)
+		if result != expected {
+			t.Fatalf("Expected %f to scale to '%s' but got '%s'\n", value, expected, result)
+		}
+	}
+}
+
+func TestScaleNumeric(t *testing.T) {
+	scaleTests := map[float64]string{
+		5.54 * 1e12:    "5.5T",
+		4.44 * 1e9:     "4.4B",
+		3.34 * 1e6:     "3.3M",
+		2.24 * 1e3:     "2.2K",
+		1.1:            "1.1",
+		0.0611:         "0.06",
+		-5.5432 * 1e12: "-5.5T",
+	}
+
+	for value, expected := range scaleTests {
+		result := ScaleNumericf(value, 2)
+		if result != expected {
+			t.Fatalf("Expected %f to scale to '%s' but got '%s'\n", value, expected, result)
+		}
+	}
+}