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|
package main
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"os"
"github.com/kisom/goutils/lib"
)
func prettify(file string, validateOnly bool) error {
var in []byte
var err error
if file == "-" {
in, err = ioutil.ReadAll(os.Stdin)
} else {
in, err = ioutil.ReadFile(file)
}
if err != nil {
lib.Warn(err, "ReadFile")
return err
}
var buf = &bytes.Buffer{}
err = json.Indent(buf, in, "", " ")
if err != nil {
lib.Warn(err, "%s", file)
return err
}
if validateOnly {
return nil
}
if file == "-" {
_, err = os.Stdout.Write(buf.Bytes())
} else {
err = ioutil.WriteFile(file, buf.Bytes(), 0644)
}
if err != nil {
lib.Warn(err, "WriteFile")
}
return err
}
func compact(file string, validateOnly bool) error {
var in []byte
var err error
if file == "-" {
in, err = ioutil.ReadAll(os.Stdin)
} else {
in, err = ioutil.ReadFile(file)
}
if err != nil {
lib.Warn(err, "ReadFile")
return err
}
var buf = &bytes.Buffer{}
err = json.Compact(buf, in)
if err != nil {
lib.Warn(err, "%s", file)
return err
}
if validateOnly {
return nil
}
if file == "-" {
_, err = os.Stdout.Write(buf.Bytes())
} else {
err = ioutil.WriteFile(file, buf.Bytes(), 0644)
}
if err != nil {
lib.Warn(err, "WriteFile")
}
return err
}
func usage() {
progname := lib.ProgName()
fmt.Printf(`Usage: %s [-h] files...
%s is used to lint and prettify (or compact) JSON files. The
files will be updated in-place.
Flags:
-c Compact files.
-h Print this help message.
-n Don't prettify; only perform validation.
`, progname, progname)
}
func init() {
flag.Usage = usage
}
func main() {
var shouldCompact, validateOnly bool
flag.BoolVar(&shouldCompact, "c", false, "Compact files instead of prettifying.")
flag.BoolVar(&validateOnly, "n", false, "Don't write changes; only perform validation.")
flag.Parse()
action := prettify
if shouldCompact {
action = compact
}
var errCount int
for _, fileName := range flag.Args() {
err := action(fileName, validateOnly)
if err != nil {
errCount++
}
}
if errCount > 0 {
lib.Errx(lib.ExitFailure, "Not all files succeeded.")
}
}
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