improve the UX for replacing messages

cli/mpool.go

@@ -7,6 +7,7 @@ import (
 	"sort"
 	"strconv"
 
+	cid "github.com/ipfs/go-cid"
 	"github.com/urfave/cli/v2"
 	"golang.org/x/xerrors"
 
@@ -43,6 +44,10 @@ var mpoolPending = &cli.Command{
 			Name:  "local",
 			Usage: "print pending messages for addresses in local wallet only",
 		},
+		&cli.BoolFlag{
+			Name:  "cids",
+			Usage: "only print cids of messages in output",
+		},
 	},
 	Action: func(cctx *cli.Context) error {
 		api, closer, err := GetFullNodeAPI(cctx)
@@ -79,12 +84,16 @@ var mpoolPending = &cli.Command{
 				}
 			}
 
+			if cctx.Bool("cids") {
+				fmt.Println(msg.Cid())
+			} else {
 				out, err := json.MarshalIndent(msg, "", "  ")
 				if err != nil {
 					return err
 				}
 				fmt.Println(string(out))
 			}
+		}
 
 		return nil
 	},
@@ -308,21 +317,8 @@ var mpoolReplaceCmd = &cli.Command{
 			Usage: "Spend up to X FIL for this message (applicable for auto mode)",
 		},
 	},
-	ArgsUsage: "[from] [nonce]",
+	ArgsUsage: "<from nonce> | <message-cid>",
 	Action: func(cctx *cli.Context) error {
-		if cctx.Args().Len() < 2 {
-			return cli.ShowCommandHelp(cctx, cctx.Command.Name)
-		}
-
-		from, err := address.NewFromString(cctx.Args().Get(0))
-		if err != nil {
-			return err
-		}
-
-		nonce, err := strconv.ParseUint(cctx.Args().Get(1), 10, 64)
-		if err != nil {
-			return err
-		}
 
 		api, closer, err := GetFullNodeAPI(cctx)
 		if err != nil {
@@ -332,6 +328,39 @@ var mpoolReplaceCmd = &cli.Command{
 
 		ctx := ReqContext(cctx)
 
+		var from address.Address
+		var nonce uint64
+		switch cctx.Args().Len() {
+		case 1:
+			mcid, err := cid.Decode(cctx.Args().First())
+			if err != nil {
+				return err
+			}
+
+			msg, err := api.ChainGetMessage(ctx, mcid)
+			if err != nil {
+				return fmt.Errorf("could not find referenced message: %w", err)
+			}
+
+			from = msg.From
+			nonce = msg.Nonce
+		case 2:
+			f, err := address.NewFromString(cctx.Args().Get(0))
+			if err != nil {
+				return err
+			}
+
+			n, err := strconv.ParseUint(cctx.Args().Get(1), 10, 64)
+			if err != nil {
+				return err
+			}
+
+			from = f
+			nonce = n
+		default:
+			return cli.ShowCommandHelp(cctx, cctx.Command.Name)
+		}
+
 		ts, err := api.ChainHead(ctx)
 		if err != nil {
 			return xerrors.Errorf("getting chain head: %w", err)