pkg: hide it by moving to _pkg.dev

The idea here is to preserve the history of `dev` branch development and its
code when merging with the `master`. Later this code could be moved into the
masters code where appropriate.

_pkg.dev/wire/util/fixed8/fixed8.go

@@ -0,0 +1,62 @@
+package fixed8
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+)
+
+const (
+	decimals = 100000000
+)
+
+var errInvalidString = errors.New("Fixed8 must satisfy following regex \\d+(\\.\\d{1,8})?")
+
+// Fixed8 represents a fixed-point number with precision 10^-8.
+type Fixed8 int64
+
+// String implements the Stringer interface.
+func (f Fixed8) String() string {
+	val := f.Value()
+	return strconv.FormatFloat(val, 'f', -1, 64)
+}
+
+// Value returns the original value representing the Fixed8.
+func (f Fixed8) Value() float64 {
+	return float64(f) / float64(decimals)
+}
+
+// Add adds two Fixed8 values together
+func (f Fixed8) Add(val Fixed8) Fixed8 {
+	a := int64(f.Value())
+	b := int64(val.Value())
+	c := a + b
+	return FromInt(c)
+}
+
+//Sub subtracts two fixed values from each other
+func (f Fixed8) Sub(val Fixed8) Fixed8 {
+	a := int64(f.Value())
+	b := int64(val.Value())
+	c := a - b
+	return FromInt(c)
+}
+
+//FromInt returns a Fixed8 objects from an int64
+func FromInt(val int64) Fixed8 {
+	return Fixed8(val * decimals)
+}
+
+// FromFloat returns a Fixed8 object from a float64
+func FromFloat(val float64) Fixed8 {
+	return Fixed8(val * decimals)
+}
+
+// FromString returns a Fixed8 object from a string
+func FromString(val string) (Fixed8, error) {
+	res, err := strconv.ParseFloat(val, 64)
+	if err != nil {
+		return 0, fmt.Errorf("failed at parsing string %s", val)
+	}
+	return FromFloat(res), nil
+}