colorize json output (#169)

cmd/nigiri/rpc.go

@@ -1,11 +1,16 @@
 package main
 
 import (
+	"bytes"
+	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
 	"os"
 	"os/exec"
+	"strings"
 
+	"github.com/logrusorgru/aurora"
 	"github.com/urfave/cli/v2"
 )
 
@@ -34,7 +39,6 @@ var rpc = cli.Command{
 }
 
 func rpcAction(ctx *cli.Context) error {
-
 	if isRunning, _ := nigiriState.GetBool("running"); !isRunning {
 		return errors.New("nigiri is not running")
 	}
@@ -56,12 +60,77 @@ func rpcAction(ctx *cli.Context) error {
 	}
 	cmdArgs := append(rpcArgs, ctx.Args().Slice()...)
 	bashCmd := exec.Command("docker", cmdArgs...)
-	bashCmd.Stdout = os.Stdout
+	// Create a pipe for the output of the "docker exec" command
+	r, w := io.Pipe()
+	bashCmd.Stdout = w
 	bashCmd.Stderr = os.Stderr
 
-	if err := bashCmd.Run(); err != nil {
-		return err
-	}
+	// Start a goroutine to run the "docker exec" command
+	go func() {
+		if err := bashCmd.Run(); err != nil {
+			w.CloseWithError(err)
+		} else {
+			w.Close()
+		}
+	}()
+
+	// Read the output of the "docker exec" command from the pipe
+	buf := new(bytes.Buffer)
+	buf.ReadFrom(r)
+	output := buf.Bytes()
+
+	// Use the json.Unmarshal function to parse the output of the
+	// "docker exec" command and check if it is a valid JSON object
+	var v interface{}
+	if err := json.Unmarshal(output, &v); err == nil {
+		// Use the json.Marshal function to convert the parsed JSON object
+		// to a byte slice
+		jsonBytes, err := json.Marshal(v)
+		if err != nil {
+			return err
+		}
+
+		// Use the bytes.Buffer type to create a buffer that we can use
+		// to write the indented JSON string to
+		var buf bytes.Buffer
 
+		// Use the json.Indent function to add indentation to the JSON byte slice
+		// in the same way as if you were using the "jq" command
+		if err := json.Indent(&buf, jsonBytes, "", "    "); err != nil {
+			return err
+		}
+
+		// Split the indented JSON string into individual lines
+		lines := strings.Split(buf.String(), "\n")
+
+		// Loop through each line in the indented JSON string
+		for _, line := range lines {
+			// Check if the line starts with a "{" or a "["
+			if strings.HasPrefix(line, "{") || strings.HasPrefix(line, "[") {
+				// If the line starts with a "{" or a "[", it is the start of a JSON object
+				// or array, so print it without any color
+				fmt.Println(line)
+			} else if strings.Contains(line, ":") {
+				// If the line contains a ":", it is a key-value pair, so split the line
+				// into the key and value parts and add the desired colors to each part
+				parts := strings.SplitN(line, ":", 2)
+				key := parts[0]
+				value := parts[1]
+				// Use the AnsiColorCode function from the "github.com/logrusorgru/aurora"
+				// package to create ANSI escape codes for the "key" and "value" colors
+				keyColor := aurora.BrightBlue(key)
+				valueColor := aurora.BrightCyan(value)
+
+				fmt.Printf("%s: %s\n", keyColor.String(), valueColor.String())
+			} else {
+				// If the line does not start with a "{" or a "[" and does not contain a ":",
+				// it is not a JSON object or array and does not contain a key-value pair, so
+				// print it without any color
+				fmt.Println(line)
+			}
+		}
+	} else {
+		fmt.Println(string(output))
+	}
 	return nil
 }

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/btcsuite/btcd v0.21.0-beta // indirect
 	github.com/btcsuite/btcutil v1.0.2
 	github.com/compose-spec/compose-go v0.0.0-20210729195839-de56f4f0cb3c
+	github.com/logrusorgru/aurora v2.0.3+incompatible // indirect
 	github.com/urfave/cli/v2 v2.3.0
 	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad // indirect
 	golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e // indirect

go.sum

@@ -90,6 +90,8 @@ github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFB
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/logrusorgru/aurora v2.0.3+incompatible h1:tOpm7WcpBTn4fjmVfgpQq0EfczGlG91VSDkswnjF5A8=
+github.com/logrusorgru/aurora v2.0.3+incompatible/go.mod h1:7rIyQOR62GCctdiQpZ/zOJlFyk6y+94wXzv6RNZgaR4=
 github.com/marstr/guid v1.1.0/go.mod h1:74gB1z2wpxxInTG6yaqA7KrtM0NZ+RbrcqDvYHefzho=
 github.com/mattn/go-shellwords v1.0.12 h1:M2zGm7EW6UQJvDeQxo4T51eKPurbeFbe8WtebGE2xrk=
 github.com/mattn/go-shellwords v1.0.12/go.mod h1:EZzvwXDESEeg03EKmM+RmDnNOPKG4lLtQsUlTZDWQ8Y=