refactor: extract json output formatting to utils.PrintJSON and add colorized json output with new dns tld command

1 files changed, 112 insertions, 1 deletions

diff --git a/internal/utils/output.go b/internal/utils/output.go
index 3f2347c..e8e97bc 100644
--- a/internal/utils/output.go
+++ b/internal/utils/output.go
@@ -1,18 +1,129 @@
 package utils
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"os"
 	"text/tabwriter"
 )
 
+const (
+	colorReset  = "\033[0m"
+	colorKey    = "\033[36m"
+	colorString = "\033[32m"
+	colorNumber = "\033[33m"
+	colorBool   = "\033[35m"
+	colorNull   = "\033[90m"
+	colorBrace  = "\033[37m"
+)
+
+func colorizeJSON(data []byte) string {
+	if !isTerminal() {
+		return string(data)
+	}
+
+	var result bytes.Buffer
+	var inString bool
+	var isKey bool
+	var depth int
+
+	for i := 0; i < len(data); i++ {
+		c := data[i]
+
+		switch c {
+		case '"':
+			if i > 0 && data[i-1] != '\\' {
+				inString = !inString
+				if inString {
+					if i > 0 && (data[i-1] == '{' || data[i-1] == ',' || data[i-1] == '[' || data[i-1] == '\n' || data[i-1] == ' ') {
+						isKey = true
+						result.WriteString(colorKey)
+					} else {
+						result.WriteString(colorString)
+					}
+				} else {
+					result.WriteByte(c)
+					result.WriteString(colorReset)
+					if isKey && i+1 < len(data) && data[i+1] == ':' {
+						isKey = false
+					}
+					continue
+				}
+			}
+			result.WriteByte(c)
+
+		case '{', '}', '[', ']':
+			if !inString {
+				result.WriteString(colorBrace)
+				result.WriteByte(c)
+				result.WriteString(colorReset)
+				if c == '{' || c == '[' {
+					depth++
+				} else {
+					depth--
+				}
+			} else {
+				result.WriteByte(c)
+			}
+
+		case 't', 'f':
+			if !inString && i+3 < len(data) {
+				word := string(data[i:min(i+5, len(data))])
+				if word[:4] == "true" || word[:5] == "false" {
+					result.WriteString(colorBool)
+					if word[:4] == "true" {
+						result.WriteString("true")
+						i += 3
+					} else {
+						result.WriteString("false")
+						i += 4
+					}
+					result.WriteString(colorReset)
+				} else {
+					result.WriteByte(c)
+				}
+			} else {
+				result.WriteByte(c)
+			}
+
+		case 'n':
+			if !inString && i+3 < len(data) && string(data[i:i+4]) == "null" {
+				result.WriteString(colorNull)
+				result.WriteString("null")
+				result.WriteString(colorReset)
+				i += 3
+			} else {
+				result.WriteByte(c)
+			}
+
+		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-':
+			if !inString {
+				result.WriteString(colorNumber)
+				for i < len(data) && (data[i] >= '0' && data[i] <= '9' || data[i] == '.' || data[i] == '-' || data[i] == 'e' || data[i] == 'E' || data[i] == '+') {
+					result.WriteByte(data[i])
+					i++
+				}
+				i--
+				result.WriteString(colorReset)
+			} else {
+				result.WriteByte(c)
+			}
+
+		default:
+			result.WriteByte(c)
+		}
+	}
+
+	return result.String()
+}
+
 func PrintJSON(data any) error {
 	output, err := json.MarshalIndent(data, "", "  ")
 	if err != nil {
 		return fmt.Errorf("failed to format JSON: %w", err)
 	}
-	fmt.Println(string(output))
+	fmt.Println(colorizeJSON(output))
 	return nil
 }