Add comprehensive CSV output support

README.md

@@ -96,10 +96,12 @@ All list commands support multiple output formats:
 
 - `yaml` (default)
 - `json`
+- `csv`
 
 Example:
 ```bash
 onecli user list --output json
+onecli user list --output csv
 ```
 
 ## Configuration

cmd/app.go

@@ -95,9 +95,9 @@ func init() {
 	appCmd.AddCommand(appListCmd)
 	appCmd.AddCommand(appListUsersCmd)
 
-	appListCmd.Flags().StringVarP(&appOutput, "output", "o", "yaml", "Output format (yaml, json)")
+	appListCmd.Flags().StringVarP(&appOutput, "output", "o", "yaml", "Output format (yaml, json, csv)")
 	appListCmd.Flags().StringVar(&appQueryName, "name", "", "Filter apps by name")
 	appListCmd.Flags().BoolVar(&appDetail, "detail", false, "Include user details for each app")
 
-	appListUsersCmd.Flags().StringVarP(&appOutput, "output", "o", "yaml", "Output format (yaml, json)")
+	appListUsersCmd.Flags().StringVarP(&appOutput, "output", "o", "yaml", "Output format (yaml, json, csv)")
 }

cmd/event.go

@@ -159,7 +159,7 @@ func init() {
 	eventCmd.AddCommand(eventListCmd)
 	eventCmd.AddCommand(eventTypesCmd)
 
-	eventListCmd.Flags().StringVarP(&eventOutput, "output", "o", "yaml", "Output format (yaml, json)")
+	eventListCmd.Flags().StringVarP(&eventOutput, "output", "o", "yaml", "Output format (yaml, json, csv)")
 	eventListCmd.Flags().StringVar(&eventQueryClientID, "client-id", "", "Filter events by client ID")
 	eventListCmd.Flags().StringVar(&eventQueryCreatedAt, "created-at", "", "Filter events by created at")
 	eventListCmd.Flags().StringVar(&eventQueryDirectoryID, "directory-id", "", "Filter events by directory ID")
@@ -174,5 +174,5 @@ func init() {
 	// Make --type and --type-id mutually exclusive
 	eventListCmd.MarkFlagsMutuallyExclusive("type", "type-id")
 
-	eventTypesCmd.Flags().StringVarP(&eventOutput, "output", "o", "yaml", "Output format (yaml, json)")
+	eventTypesCmd.Flags().StringVarP(&eventOutput, "output", "o", "yaml", "Output format (yaml, json, csv)")
 }

cmd/user.go

@@ -178,7 +178,7 @@ func init() {
 	modifyCmd.AddCommand(modifyEmailCmd)
 	userCmd.AddCommand(addCmd)
 
-	listCmd.Flags().StringVarP(&output, "output", "o", "yaml", "Output format (yaml, json)")
+	listCmd.Flags().StringVarP(&output, "output", "o", "yaml", "Output format (yaml, json, csv)")
 	listCmd.Flags().StringVar(&userQueryEmail, "email", "", "Filter users by email")
 	listCmd.Flags().StringVar(&userQueryUsername, "username", "", "Filter users by username")
 	listCmd.Flags().StringVar(&userQueryFirstname, "firstname", "", "Filter users by first name")

utils/output.go

@@ -1,9 +1,14 @@
 package utils
 
 import (
+	"encoding/csv"
 	"encoding/json"
+	"fmt"
 	"io"
 	"os"
+	"reflect"
+	"strconv"
+	"time"
 
 	"github.com/goccy/go-yaml"
 )
@@ -14,6 +19,7 @@ type OutputFormat string
 const (
 	OutputFormatYAML OutputFormat = "yaml"
 	OutputFormatJSON OutputFormat = "json"
+	OutputFormatCSV  OutputFormat = "csv"
 )
 
 // PrintOutput は指定された形式でデータを出力します
@@ -31,7 +37,98 @@ func PrintOutput(data any, format OutputFormat, writer io.Writer) error {
 		return encoder.Encode(data)
 	case OutputFormatYAML:
 		return yaml.NewEncoder(writer).Encode(data)
+	case OutputFormatCSV:
+		return encodeCSV(data, writer)
 	default:
 		return yaml.NewEncoder(writer).Encode(data)
 	}
 }
+
+// encodeCSV はデータをCSV形式でエンコードします
+func encodeCSV(data any, writer io.Writer) error {
+	csvWriter := csv.NewWriter(writer)
+	defer csvWriter.Flush()
+
+	// データがスライスでない場合はエラー
+	val := reflect.ValueOf(data)
+	if val.Kind() != reflect.Slice {
+		return fmt.Errorf("CSV output requires slice data, got %v", val.Kind())
+	}
+
+	if val.Len() == 0 {
+		return nil
+	}
+
+	// 最初の要素からヘッダーを生成
+	firstElem := val.Index(0)
+	if firstElem.Kind() == reflect.Ptr {
+		firstElem = firstElem.Elem()
+	}
+
+	if firstElem.Kind() != reflect.Struct {
+		return fmt.Errorf("CSV output requires struct slice, got %v", firstElem.Kind())
+	}
+
+	// ヘッダーを生成
+	var headers []string
+	elemType := firstElem.Type()
+	for i := 0; i < elemType.NumField(); i++ {
+		field := elemType.Field(i)
+		headers = append(headers, field.Name)
+	}
+
+	// ヘッダーを書き込み
+	if err := csvWriter.Write(headers); err != nil {
+		return fmt.Errorf("error writing CSV headers: %v", err)
+	}
+
+	// データ行を書き込み
+	for i := 0; i < val.Len(); i++ {
+		elem := val.Index(i)
+		if elem.Kind() == reflect.Ptr {
+			elem = elem.Elem()
+		}
+
+		var row []string
+		for j := 0; j < elem.NumField(); j++ {
+			field := elem.Field(j)
+			row = append(row, formatFieldValue(field))
+		}
+
+		if err := csvWriter.Write(row); err != nil {
+			return fmt.Errorf("error writing CSV row %d: %v", i, err)
+		}
+	}
+
+	return nil
+}
+
+// formatFieldValue はフィールドの値を文字列に変換します
+func formatFieldValue(field reflect.Value) string {
+	switch field.Kind() {
+	case reflect.String:
+		return field.String()
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return strconv.FormatInt(field.Int(), 10)
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return strconv.FormatUint(field.Uint(), 10)
+	case reflect.Float32, reflect.Float64:
+		return strconv.FormatFloat(field.Float(), 'f', -1, 64)
+	case reflect.Bool:
+		return strconv.FormatBool(field.Bool())
+	case reflect.Struct:
+		// time.Timeの場合はRFC3339形式で出力
+		if field.Type() == reflect.TypeOf(time.Time{}) {
+			t := field.Interface().(time.Time)
+			return t.Format(time.RFC3339)
+		}
+		return fmt.Sprintf("%v", field.Interface())
+	case reflect.Ptr:
+		if field.IsNil() {
+			return ""
+		}
+		return formatFieldValue(field.Elem())
+	default:
+		return fmt.Sprintf("%v", field.Interface())
+	}
+}

utils/output_test.go

@@ -106,6 +106,73 @@ func TestPrintOutput(t *testing.T) {
 			expected: "",
 			wantErr:  true,
 		},
+		{
+			name:   "正常系: CSV形式で出力",
+			format: OutputFormatCSV,
+			data: []models.User{
+				{
+					ID:          1,
+					Username:    "testuser1",
+					Email:       "test1@example.com",
+					Firstname:   "Test",
+					Lastname:    "User1",
+					CreatedAt:   time.Date(2024, 4, 1, 12, 0, 0, 0, time.UTC),
+					UpdatedAt:   time.Date(2024, 4, 1, 12, 0, 0, 0, time.UTC),
+					ActivatedAt: time.Date(2024, 4, 1, 12, 0, 0, 0, time.UTC),
+					State:       1,
+					Status:      1,
+				},
+				{
+					ID:          2,
+					Username:    "testuser2",
+					Email:       "test2@example.com",
+					Firstname:   "Test",
+					Lastname:    "User2",
+					CreatedAt:   time.Date(2024, 4, 2, 12, 0, 0, 0, time.UTC),
+					UpdatedAt:   time.Date(2024, 4, 2, 12, 0, 0, 0, time.UTC),
+					ActivatedAt: time.Date(2024, 4, 2, 12, 0, 0, 0, time.UTC),
+					State:       1,
+					Status:      1,
+				},
+			},
+			expected: "Firstname,Lastname,Username,Email,DistinguishedName,Samaccountname,UserPrincipalName,MemberOf,Phone,Password,PasswordConfirmation,PasswordAlgorithm,Salt,Title,Company,Department,ManagerADID,Comment,CreatedAt,UpdatedAt,ActivatedAt,LastLogin,PasswordChangedAt,LockedUntil,InvitationSentAt,State,Status,InvalidLoginAttempts,GroupID,RoleIDs,DirectoryID,TrustedIDPID,ManagerUserID,ExternalID,ID,CustomAttributes\nTest,User1,testuser1,test1@example.com,,,,[],,,,,,,,,0,,2024-04-01T12:00:00Z,2024-04-01T12:00:00Z,2024-04-01T12:00:00Z,0001-01-01T00:00:00Z,0001-01-01T00:00:00Z,0001-01-01T00:00:00Z,0001-01-01T00:00:00Z,1,1,0,0,[],0,0,0,,1,map[]\nTest,User2,testuser2,test2@example.com,,,,[],,,,,,,,,0,,2024-04-02T12:00:00Z,2024-04-02T12:00:00Z,2024-04-02T12:00:00Z,0001-01-01T00:00:00Z,0001-01-01T00:00:00Z,0001-01-01T00:00:00Z,0001-01-01T00:00:00Z,1,1,0,0,[],0,0,0,,2,map[]\n",
+			wantErr:  false,
+		},
+		{
+			name:     "異常系: CSV形式でスライス以外のデータ",
+			format:   OutputFormatCSV,
+			data:     "not a slice",
+			expected: "",
+			wantErr:  true,
+		},
+		{
+			name:     "異常系: CSV形式で空のスライス",
+			format:   OutputFormatCSV,
+			data:     []models.User{},
+			expected: "",
+			wantErr:  false,
+		},
+		{
+			name:   "正常系: CSV形式で改行を含む文字列",
+			format: OutputFormatCSV,
+			data: []models.User{
+				{
+					ID:          1,
+					Username:    "testuser1",
+					Email:       "test1@example.com",
+					Firstname:   "Test",
+					Lastname:    "User1",
+					Comment:     "This is a comment\nwith multiple lines\nand special chars, like comma",
+					CreatedAt:   time.Date(2024, 4, 1, 12, 0, 0, 0, time.UTC),
+					UpdatedAt:   time.Date(2024, 4, 1, 12, 0, 0, 0, time.UTC),
+					ActivatedAt: time.Date(2024, 4, 1, 12, 0, 0, 0, time.UTC),
+					State:       1,
+					Status:      1,
+				},
+			},
+			expected: "Firstname,Lastname,Username,Email,DistinguishedName,Samaccountname,UserPrincipalName,MemberOf,Phone,Password,PasswordConfirmation,PasswordAlgorithm,Salt,Title,Company,Department,ManagerADID,Comment,CreatedAt,UpdatedAt,ActivatedAt,LastLogin,PasswordChangedAt,LockedUntil,InvitationSentAt,State,Status,InvalidLoginAttempts,GroupID,RoleIDs,DirectoryID,TrustedIDPID,ManagerUserID,ExternalID,ID,CustomAttributes\nTest,User1,testuser1,test1@example.com,,,,[],,,,,,,,,0,\"This is a comment\nwith multiple lines\nand special chars, like comma\",2024-04-01T12:00:00Z,2024-04-01T12:00:00Z,2024-04-01T12:00:00Z,0001-01-01T00:00:00Z,0001-01-01T00:00:00Z,0001-01-01T00:00:00Z,0001-01-01T00:00:00Z,1,1,0,0,[],0,0,0,,1,map[]\n",
+			wantErr:  false,
+		},
 	}
 
 	for _, tt := range tests {
@@ -120,9 +187,12 @@ func TestPrintOutput(t *testing.T) {
 			assert.NoError(t, err)
 			output := buf.String()
 
-			if tt.format == OutputFormatJSON {
+			switch tt.format {
+			case OutputFormatJSON:
 				assert.JSONEq(t, tt.expected.(string), output)
-			} else {
+			case OutputFormatCSV:
+				assert.Equal(t, tt.expected.(string), output)
+			default:
 				expectedBytes, err := yaml.Marshal(tt.expected)
 				assert.NoError(t, err)
 				assert.YAMLEq(t, string(expectedBytes), output)