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
6package main
7
8import (
9	"flag"
10	"fmt"
11	"io"
12	"io/ioutil"
13	"os"
14
15	"github.com/pelletier/go-toml"
16)
17
18func main() {
19	flag.Usage = func() {
20		fmt.Fprintln(os.Stderr, `tomll can be used in two ways:
21Writing to STDIN and reading from STDOUT:
22  cat file.toml | tomll > file.toml
23
24Reading and updating a list of files:
25  tomll a.toml b.toml c.toml
26
27When given a list of files, tomll will modify all files in place without asking.
28`)
29	}
30	flag.Parse()
31	// read from stdin and print to stdout
32	if flag.NArg() == 0 {
33		s, err := lintReader(os.Stdin)
34		if err != nil {
35			io.WriteString(os.Stderr, err.Error())
36			os.Exit(-1)
37		}
38		io.WriteString(os.Stdout, s)
39	} else {
40		// otherwise modify a list of files
41		for _, filename := range flag.Args() {
42			s, err := lintFile(filename)
43			if err != nil {
44				io.WriteString(os.Stderr, err.Error())
45				os.Exit(-1)
46			}
47			ioutil.WriteFile(filename, []byte(s), 0644)
48		}
49	}
50}
51
52func lintFile(filename string) (string, error) {
53	tree, err := toml.LoadFile(filename)
54	if err != nil {
55		return "", err
56	}
57	return tree.String(), nil
58}
59
60func lintReader(r io.Reader) (string, error) {
61	tree, err := toml.LoadReader(r)
62	if err != nil {
63		return "", err
64	}
65	return tree.String(), nil
66}
67