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hujsonfmt.go
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hujsonfmt.go
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package main
import (
"flag"
"fmt"
"io"
"io/fs"
"os"
"path/filepath"
"runtime"
"strings"
"github.com/hexops/gotextdiff"
"github.com/hexops/gotextdiff/myers"
"github.com/hexops/gotextdiff/span"
"github.com/nrawrx3/hujson"
)
var (
min = flag.Bool("m", false, "minify results")
stand = flag.Bool("s", false, "standardize results to plain JSON")
diff = flag.Bool("d", false, "display diffs instead of rewriting files")
list = flag.Bool("l", false,
"list files whose formatting differs from hujsonfmt's",
)
write = flag.Bool("w", false,
"write result to (source) file instead of stdout",
)
chmodSupported = runtime.GOOS != "windows"
huJSONExt = ".hujson"
)
func usage() {
fmt.Fprintf(os.Stderr, "usage: hujsonfmt [flags] [path ...]\n")
flag.PrintDefaults()
}
func main() {
err := mainE()
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
usage()
os.Exit(1)
}
}
func mainE() error {
flag.Usage = usage
flag.Parse()
args := flag.Args()
if len(args) == 0 || (len(args) == 1 && args[0] == "-") {
stat, _ := os.Stdin.Stat()
if (stat.Mode() & os.ModeCharDevice) != 0 {
return fmt.Errorf("no files paths or stdin provided")
}
if *write {
return fmt.Errorf("cannot use -w with standard input")
}
return processFile(nil, "<standard input>", os.Stdin)
}
for _, arg := range args {
info, err := os.Stat(arg)
switch {
case err != nil:
return err
case !info.IsDir():
err := processFile(info, arg, nil)
if err != nil {
return err
}
default:
err := filepath.WalkDir(
arg,
func(path string, f fs.DirEntry, err error) error {
if err != nil || !isHuJSONFile(f) {
return err
}
return processFile(info, path, nil)
},
)
if err != nil {
return err
}
}
}
return nil
}
func isHuJSONFile(f fs.DirEntry) bool {
return strings.HasSuffix(f.Name(), huJSONExt) && !f.IsDir()
}
func processFile(info fs.FileInfo, filename string, in io.Reader) error {
src, err := readFile(filename, in)
if err != nil {
return err
}
// The main hujson functions will sometimes modify the original input byte
// slice. Hence we create a copy of the src byte slice to avoid modifying
// src, enabling us to reliably print diffs.
input := make([]byte, len(src))
_ = copy(input, src)
output, err := processSrc(input)
if err != nil {
return err
}
switch {
case *diff:
printDiff(filename, src, output)
case *list:
fmt.Println(filename)
case *write:
err = writeFile(info, filename, src, output)
if err != nil {
return err
}
default:
fmt.Print(string(output))
}
return nil
}
func readFile(path string, in io.Reader) ([]byte, error) {
if in == nil {
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
in = f
}
src, err := io.ReadAll(in)
if err != nil {
return nil, err
}
return src, nil
}
func processSrc(src []byte) ([]byte, error) {
var r []byte
var err error
switch {
case *min:
r, err = hujson.Minimize(src)
case *stand:
r, err = hujson.Standardize(src)
default:
r, err = hujson.Format(src)
}
if err != nil {
return nil, err
}
return r, nil
}
func printDiff(filename string, src, modified []byte) {
origFile := filename + ".orig"
old := string(src)
new := string(modified)
edits := myers.ComputeEdits(
span.URIFromPath(origFile), old, new,
)
diff := fmt.Sprint(
gotextdiff.ToUnified(origFile, filename, old, edits),
)
if diff == "" {
return
}
fmt.Printf("diff %s %s\n", origFile, filename)
fmt.Println(diff)
}
func writeFile(info fs.FileInfo, filename string, src, data []byte) error {
if info == nil {
panic("-w should not have been allowed with standard input")
}
perms := info.Mode().Perm()
var bak string
bak, err := backupFile(filename, src, perms)
if err != nil {
return err
}
err = os.WriteFile(filename, data, perms)
if err != nil {
_ = os.Rename(bak, filename)
return err
}
err = os.Remove(bak)
if err != nil {
return err
}
return nil
}
func backupFile(
filename string,
data []byte,
perms fs.FileMode,
) (backupFile string, err error) {
var f *os.File
f, err = os.CreateTemp(filepath.Dir(filename), filepath.Base(filename))
if err != nil {
return "", err
}
defer f.Close()
backupFile = f.Name()
if chmodSupported {
err = f.Chmod(perms)
if err != nil {
_ = os.Remove(backupFile)
return "", err
}
}
_, err = f.Write(data)
if err != nil {
_ = os.Remove(backupFile)
return "", err
}
return backupFile, nil
}