yamlfmt.go

Documentation: k8s.io/kubernetes/cmd/yamlfmt

     1  /*
     2  Copyright 2021 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package main
    18  
    19  import (
    20  	"flag"
    21  	"fmt"
    22  	"io"
    23  	"os"
    24  
    25  	"gopkg.in/yaml.v3"
    26  )
    27  
    28  func main() {
    29  	indent := flag.Int("indent", 2, "default indent")
    30  	flag.Parse()
    31  	for _, path := range flag.Args() {
    32  		sourceYaml, err := os.ReadFile(path)
    33  		if err != nil {
    34  			fmt.Fprintf(os.Stderr, "%s: %v\n", path, err)
    35  			continue
    36  		}
    37  		rootNode, err := fetchYaml(sourceYaml)
    38  		if err != nil {
    39  			fmt.Fprintf(os.Stderr, "%s: %v\n", path, err)
    40  			continue
    41  		}
    42  		writer, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
    43  		if err != nil {
    44  			fmt.Fprintf(os.Stderr, "%s: %v\n", path, err)
    45  			continue
    46  		}
    47  		err = streamYaml(writer, indent, rootNode)
    48  		if err != nil {
    49  			fmt.Fprintf(os.Stderr, "%s: %v\n", path, err)
    50  			continue
    51  		}
    52  	}
    53  }
    54  
    55  func fetchYaml(sourceYaml []byte) (*yaml.Node, error) {
    56  	rootNode := yaml.Node{}
    57  	err := yaml.Unmarshal(sourceYaml, &rootNode)
    58  	if err != nil {
    59  		return nil, err
    60  	}
    61  	return &rootNode, nil
    62  }
    63  
    64  func streamYaml(writer io.Writer, indent *int, in *yaml.Node) error {
    65  	encoder := yaml.NewEncoder(writer)
    66  	encoder.SetIndent(*indent)
    67  	err := encoder.Encode(in)
    68  	if err != nil {
    69  		return err
    70  	}
    71  	return encoder.Close()
    72  }
    73
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