| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package commands |
| |
| import ( |
| "bytes" |
| "encoding/json" |
| "io" |
| "os" |
| "strings" |
| ) |
| |
| func stringRepresentation(value interface{}) (string, error) { |
| var result string |
| switch value.(type) { |
| case string: |
| result = value.(string) // use string value as-is |
| default: |
| json, err := json.Marshal(value) |
| if err != nil { |
| return "", err |
| } |
| result = string(json) // return JSON text representation of value object |
| } |
| return result, nil |
| } |
| |
| func divertStdoutToString(fn func() error) (string, error) { |
| previous := os.Stdout |
| defer func() { |
| os.Stdout = previous |
| }() |
| |
| r, w, _ := os.Pipe() |
| os.Stdout = w |
| |
| err := fn() |
| if err != nil { |
| return "", err |
| } |
| |
| errc := make(chan error) |
| var buf bytes.Buffer |
| |
| go func() { |
| _, err := io.Copy(&buf, r) |
| errc <- err |
| }() |
| w.Close() |
| err = <-errc |
| output := strings.TrimSpace(buf.String()) |
| return output, err |
| } |