cmd: minor unit and flag improvements

- `get-transaction` on miner tx's now reveal the outputs in `m`
- `get-block` now includes a `--last` to allow one to easily say "get me
the last block", or "get me the last-1 block" ...
- `get-last-block-header` now shows rewards in precise `m`

Signed-off-by: Ciro S. Costa <utxobr@protonmail.com>

cmd/monero/commands/daemon/get_block.go

@@ -18,6 +18,7 @@ import (
 type getBlockCommand struct {
 	Height    uint64
 	Hash      string
+	Last      int64
 	BlockJSON bool
 	JSON      bool
 
@@ -31,6 +32,9 @@ func (c *getBlockCommand) Cmd() *cobra.Command {
 		RunE:  c.RunE,
 	}
 
+	cmd.Flags().Int64Var(&c.Last, "last",
+		-1, "get the last Nth block")
+
 	cmd.Flags().Uint64Var(&c.Height, "height",
 		0, "height of the block to retrieve the information of")
 
@@ -39,6 +43,7 @@ func (c *getBlockCommand) Cmd() *cobra.Command {
 
 	cmd.Flags().BoolVar(&c.JSON, "json",
 		false, "whether or not to output the result as json")
+
 	cmd.Flags().BoolVar(&c.BlockJSON, "block-json",
 		false, "display just the block json (from the `json` field)")
 
@@ -54,6 +59,15 @@ func (c *getBlockCommand) RunE(_ *cobra.Command, _ []string) error {
 		return fmt.Errorf("client: %w", err)
 	}
 
+	if c.Last >= 0 {
+		lastBlockHeaderResp, err := client.GetLastBlockHeader(ctx)
+		if err != nil {
+			return fmt.Errorf("get last block header: %w", err)
+		}
+
+		c.Height = lastBlockHeaderResp.BlockHeader.Height - uint64(c.Last)
+	}
+
 	if c.Hash == "" && c.Height == 0 {
 		return fmt.Errorf("hash or height must be set")
 	}

cmd/monero/commands/daemon/get_transaction.go

@@ -5,7 +5,6 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
-	"strconv"
 	"time"
 
 	"github.com/dustin/go-humanize"
@@ -148,7 +147,7 @@ func (c *getTransactionCommand) prettyOutputs(
 	for idx, vout := range txnDetails.Vout {
 		amount := "?"
 		if vout.Amount != 0 {
-			amount = strconv.Itoa(vout.Amount)
+			amount = display.PreciseXMR(vout.Amount)
 		}
 
 		var outIdx interface{} = "?"
@@ -164,18 +163,6 @@ func (c *getTransactionCommand) prettyOutputs(
 	return nil
 }
 
-func decodeOffsets(offsets []uint) []uint {
-	accum := uint(0)
-	res := make([]uint, len(offsets))
-
-	for idx, offset := range offsets {
-		accum += offset
-		res[idx] = accum
-	}
-
-	return res
-}
-
 // nolint:forbidigo
 func (c *getTransactionCommand) prettyInputs(
 	ctx context.Context,
@@ -212,6 +199,18 @@ func (c *getTransactionCommand) prettyInputs(
 	return nil
 }
 
+func decodeOffsets(offsets []uint) []uint {
+	accum := uint(0)
+	res := make([]uint, len(offsets))
+
+	for idx, offset := range offsets {
+		accum += offset
+		res[idx] = accum
+	}
+
+	return res
+}
+
 func init() {
 	RootCommand.AddCommand((&getTransactionCommand{}).Cmd())
 }

cmd/monero/commands/daemon/pretty_printers.go

@@ -7,6 +7,7 @@ import (
 	"github.com/dustin/go-humanize"
 	"github.com/gosuri/uitable"
 
+	"github.com/cirocosta/go-monero/cmd/monero/display"
 	"github.com/cirocosta/go-monero/pkg/rpc/daemon"
 )
 
@@ -31,7 +32,7 @@ func prettyBlockHeader(table *uitable.Table, header daemon.BlockHeader) {
 	table.AddRow("Orphan Status:", header.OrphanStatus)
 	table.AddRow("Proof-of-Work Hash:", header.PowHash)
 	table.AddRow("Previous Hash:", header.PrevHash)
-	table.AddRow("Reward:", header.Reward)
+	table.AddRow("Reward:", display.PreciseXMR(header.Reward))
 	table.AddRow("Timestamp:", fmt.Sprintf("%s (%s)", timestamp, humanize.Time(timestamp)))
 	table.AddRow("Wide Cumulative Difficulty:", header.WideCumulativeDifficulty)
 	table.AddRow("Wide Difficulty:", header.WideDifficulty)

cmd/monero/display/display.go

@@ -34,6 +34,14 @@ func NewTable() *uitable.Table {
 	return table
 }
 
+func MicroXMR(v uint64) string {
+	return fmt.Sprintf("%.2f uɱ", float64(v)/float64(constant.MicroXMR))
+}
+
+func PreciseXMR(v uint64) string {
+	return fmt.Sprintf("%.6f ɱ", float64(v)/float64(constant.XMR))
+}
+
 func XMR(v uint64) string {
 	return fmt.Sprintf("%.2f ɱ", float64(v)/float64(constant.XMR))
 }

pkg/rpc/daemon/types.go

@@ -774,7 +774,7 @@ type TransactionJSON struct {
 		} `json:"key"`
 	} `json:"vin"`
 	Vout []struct {
-		Amount int `json:"amount"`
+		Amount uint64 `json:"amount"`
 		Target struct {
 			Key string `json:"key"`
 		} `json:"target"`