Merge branch 'release/v0.7.10'vv0.7.10

1 files changed, 87 insertions, 0 deletions

diff --git a/ethutil/common.go b/ethutil/common.go
new file mode 100644
index 000000000..0a29cac6c
--- /dev/null
+++ b/ethutil/common.go
@@ -0,0 +1,87 @@
+package ethutil
+
+import (
+	"fmt"
+	"math/big"
+	"runtime"
+)
+
+func IsWindows() bool {
+	return runtime.GOOS == "windows"
+}
+
+func WindonizePath(path string) string {
+	if string(path[0]) == "/" && IsWindows() {
+		path = path[1:]
+	}
+	return path
+}
+
+// The different number of units
+var (
+	Douglas  = BigPow(10, 42)
+	Einstein = BigPow(10, 21)
+	Ether    = BigPow(10, 18)
+	Finney   = BigPow(10, 15)
+	Szabo    = BigPow(10, 12)
+	Shannon  = BigPow(10, 9)
+	Babbage  = BigPow(10, 6)
+	Ada      = BigPow(10, 3)
+	Wei      = big.NewInt(1)
+)
+
+//
+// Currency to string
+// Returns a string representing a human readable format
+func CurrencyToString(num *big.Int) string {
+	var (
+		fin   *big.Int = num
+		denom string   = "Wei"
+	)
+
+	switch {
+	case num.Cmp(Douglas) >= 0:
+		fin = new(big.Int).Div(num, Douglas)
+		denom = "Douglas"
+	case num.Cmp(Einstein) >= 0:
+		fin = new(big.Int).Div(num, Einstein)
+		denom = "Einstein"
+	case num.Cmp(Ether) >= 0:
+		fin = new(big.Int).Div(num, Ether)
+		denom = "Ether"
+	case num.Cmp(Finney) >= 0:
+		fin = new(big.Int).Div(num, Finney)
+		denom = "Finney"
+	case num.Cmp(Szabo) >= 0:
+		fin = new(big.Int).Div(num, Szabo)
+		denom = "Szabo"
+	case num.Cmp(Shannon) >= 0:
+		fin = new(big.Int).Div(num, Shannon)
+		denom = "Shannon"
+	case num.Cmp(Babbage) >= 0:
+		fin = new(big.Int).Div(num, Babbage)
+		denom = "Babbage"
+	case num.Cmp(Ada) >= 0:
+		fin = new(big.Int).Div(num, Ada)
+		denom = "Ada"
+	}
+
+	// TODO add comment clarifying expected behavior
+	if len(fin.String()) > 5 {
+		return fmt.Sprintf("%sE%d %s", fin.String()[0:5], len(fin.String())-5, denom)
+	}
+
+	return fmt.Sprintf("%v %s", fin, denom)
+}
+
+// Common big integers often used
+var (
+	Big1     = big.NewInt(1)
+	Big2     = big.NewInt(2)
+	Big3     = big.NewInt(3)
+	Big0     = big.NewInt(0)
+	BigTrue  = Big1
+	BigFalse = Big0
+	Big32    = big.NewInt(32)
+	Big256   = big.NewInt(0xff)
+)