add nicer printing and parsing of filecoin values

chain/types/fil.go

@@ -0,0 +1,30 @@
+package types
+
+import (
+	"fmt"
+	"math/big"
+	"strings"
+
+	"github.com/filecoin-project/lotus/build"
+)
+
+type FIL BigInt
+
+func (f FIL) String() string {
+	r := big.NewRat(1, 1).SetFrac(f.Int, big.NewInt(build.FilecoinPrecision))
+	return strings.TrimRight(r.FloatString(30), "0")
+}
+
+func ParseFIL(s string) (FIL, error) {
+	r, ok := big.NewRat(1, 1).SetString(s)
+	if !ok {
+		return FIL{}, fmt.Errorf("failed to parse %q as a decimal number", s)
+	}
+
+	r = r.Mul(r, big.NewRat(build.FilecoinPrecision, 1))
+	if !r.IsInt() {
+		return FIL{}, fmt.Errorf("invalid FIL value: %q", s)
+	}
+
+	return FIL{r.Num()}, nil
+}

cli/send.go

@@ -36,7 +36,7 @@ var sendCmd = &cli.Command{
 			return err
 		}
 
-		val, err := types.BigFromString(cctx.Args().Get(1))
+		val, err := types.ParseFIL(cctx.Args().Get(1))
 		if err != nil {
 			return err
 		}
@@ -61,7 +61,7 @@ var sendCmd = &cli.Command{
 		msg := &types.Message{
 			From:     fromAddr,
 			To:       toAddr,
-			Value:    val,
+			Value:    types.BigInt(val),
 			GasLimit: types.NewInt(1000),
 			GasPrice: types.NewInt(0),
 		}

cli/state.go

@@ -197,7 +197,7 @@ var statePledgeCollateralCmd = &cli.Command{
 			return err
 		}
 
-		fmt.Println(coll.String())
+		fmt.Println(types.FIL(coll).String())
 		return nil
 	},
 }

cli/wallet.go

@@ -105,7 +105,7 @@ var walletBalance = &cli.Command{
 			return err
 		}
 
-		fmt.Printf("%s\n", balance.String())
+		fmt.Printf("%s\n", types.FIL(balance).String())
 		return nil
 	},
 }