start parsing K, M, B, T suffixes

pretty/pretty.go

@@ -1,8 +1,10 @@
 package pretty
 
 import (
+	"errors"
 	"fmt"
 	"math"
+	"strconv"
 )
 
 func PrettyPrintInt(n int) {
@@ -49,3 +51,40 @@ func PrettyPrint2Floats(low float64, high float64) {
 	fmt.Printf(" ")
 	PrettyPrintFloat(high)
 }
+
+func multiplyOrPassThroughError(a float64, b float64, err error) (float64, error) {
+	if err != nil {
+		return b, err
+	} else {
+		return a * b, nil
+	}
+}
+
+func parseFloat(word string) (float64, error) {
+	// l = len(word) // assuming no UTF stuff
+
+	if len(word) == 0 {
+		return 0, errors.New("String to be parsed into float must not be the empty string")
+	} else if len(word) == 1 {
+		return strconv.ParseFloat(word)
+	}
+
+	n = len(word) - 1
+	switch word[n] {
+	case "K":
+		f, err := strconv.ParseFloat(word[:n], 64)
+		return multiplyOrPassThroughError(1_000, f, err)
+	case "M":
+		f, err := strconv.ParseFloat(word[:n], 64)
+		return multiplyOrPassThroughError(1_000_000, f, err)
+	case "B":
+		f, err := strconv.ParseFloat(word[:n], 64)
+		return multiplyOrPassThroughError(1_000_000_000, f, err)
+	case "T":
+		f, err := strconv.ParseFloat(word[:n], 64)
+		return multiplyOrPassThroughError(1_000_000_000, f, err)
+	default:
+		return strconv.ParseFloat(word)
+	}
+
+}