main.go

Documentation: github.com/pelletier/go-toml/cmd/tomll

     1  // Tomll is a linter for TOML
     2  //
     3  // Usage:
     4  //   cat file.toml | tomll > file_linted.toml
     5  //   tomll file1.toml file2.toml # lint the two files in place
     6  package main
     7  
     8  import (
     9  	"bytes"
    10  	"flag"
    11  	"fmt"
    12  	"io"
    13  	"io/ioutil"
    14  	"os"
    15  
    16  	"github.com/pelletier/go-toml"
    17  )
    18  
    19  func main() {
    20  	multiLineArray := flag.Bool("multiLineArray", false, "sets up the linter to encode arrays with more than one element on multiple lines instead of one.")
    21  	flag.Usage = func() {
    22  		fmt.Fprintln(os.Stderr, "tomll can be used in two ways:")
    23  		fmt.Fprintln(os.Stderr, "Writing to STDIN and reading from STDOUT:")
    24  		fmt.Fprintln(os.Stderr, "  cat file.toml | tomll > file.toml")
    25  		fmt.Fprintln(os.Stderr, "")
    26  		fmt.Fprintln(os.Stderr, "Reading and updating a list of files:")
    27  		fmt.Fprintln(os.Stderr, "  tomll a.toml b.toml c.toml")
    28  		fmt.Fprintln(os.Stderr, "")
    29  		fmt.Fprintln(os.Stderr, "When given a list of files, tomll will modify all files in place without asking.")
    30  		fmt.Fprintln(os.Stderr, "When given a list of files, tomll will modify all files in place without asking.")
    31  		fmt.Fprintln(os.Stderr, "")
    32  		fmt.Fprintln(os.Stderr, "Flags:")
    33  		fmt.Fprintln(os.Stderr, "-multiLineArray      sets up the linter to encode arrays with more than one element on multiple lines instead of one.")
    34  	}
    35  	flag.Parse()
    36  
    37  	// read from stdin and print to stdout
    38  	if flag.NArg() == 0 {
    39  		s, err := lintReader(os.Stdin, *multiLineArray)
    40  		if err != nil {
    41  			io.WriteString(os.Stderr, err.Error())
    42  			os.Exit(-1)
    43  		}
    44  		io.WriteString(os.Stdout, s)
    45  	} else {
    46  		// otherwise modify a list of files
    47  		for _, filename := range flag.Args() {
    48  			s, err := lintFile(filename, *multiLineArray)
    49  			if err != nil {
    50  				io.WriteString(os.Stderr, err.Error())
    51  				os.Exit(-1)
    52  			}
    53  			ioutil.WriteFile(filename, []byte(s), 0644)
    54  		}
    55  	}
    56  }
    57  
    58  func lintFile(filename string, multiLineArray bool) (string, error) {
    59  	tree, err := toml.LoadFile(filename)
    60  	if err != nil {
    61  		return "", err
    62  	}
    63  
    64  	buf := new(bytes.Buffer)
    65  	if err := toml.NewEncoder(buf).ArraysWithOneElementPerLine(multiLineArray).Encode(tree); err != nil {
    66  		panic(err)
    67  	}
    68  
    69  	return buf.String(), nil
    70  }
    71  
    72  func lintReader(r io.Reader, multiLineArray bool) (string, error) {
    73  	tree, err := toml.LoadReader(r)
    74  	if err != nil {
    75  		return "", err
    76  	}
    77  
    78  	buf := new(bytes.Buffer)
    79  	if err := toml.NewEncoder(buf).ArraysWithOneElementPerLine(multiLineArray).Encode(tree); err != nil {
    80  		panic(err)
    81  	}
    82  	return buf.String(), nil
    83  }
    84
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