feat: yaml output formatter

.vscode/launch.json

@@ -11,7 +11,7 @@
             "mode": "debug",
             "program": "${workspaceFolder}/main.go",
             "args": [
-                "get", "menu"
+                "get", "menu", "-o", "yaml", "--print-config", "true"
             ]
         }
     ]

core/output/formatter.go

@@ -6,7 +6,7 @@ import (
 
 var Formatters = map[string]interfaces.Formatter{
 	"json":  &JsonFormatter{},
-	"yaml":  nil,
+	"yaml":  &YamlFormatter{},
 	"go":    &GoFormatter{},
 	"table": nil,
 }

core/output/yaml.go

@@ -0,0 +1,19 @@
+package output
+
+import (
+	"bytes"
+	"io"
+
+	"github.com/goccy/go-yaml"
+)
+
+type YamlFormatter struct{}
+
+func (f *YamlFormatter) Format(object any) (io.Reader, error) {
+	buffer, err := yaml.Marshal(object)
+	if err != nil {
+		return nil, err
+	}
+
+	return bytes.NewBuffer(buffer), nil
+}

go.mod

@@ -5,6 +5,7 @@ go 1.24.0
 require github.com/spf13/cobra v1.9.1
 
 require (
+	github.com/goccy/go-yaml v1.18.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.7 // indirect
 )

go.sum

@@ -1,4 +1,6 @@
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
+github.com/goccy/go-yaml v1.18.0 h1:8W7wMFS12Pcas7KU+VVkaiCng+kG8QiFeFwzFb+rwuw=
+github.com/goccy/go-yaml v1.18.0/go.mod h1:XBurs7gK8ATbW4ZPGKgcbrY1Br56PdM69F7LkFRi1kA=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=