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main.go
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main.go
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package main
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"io"
"os"
"path/filepath"
"runtime"
"strings"
"sync"
"sync/atomic"
)
func formatFile(name, indent string, sortKeys bool, buf *bytes.Buffer) error {
f, err := os.Open(name)
if err != nil {
return err
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
return err
}
dir, base := filepath.Split(name)
tmp, err := os.CreateTemp(dir, base+".*")
if err != nil {
return err
}
exit := func(err error) error {
tmp.Close()
os.Remove(tmp.Name())
return err
}
buf.Reset()
dec := json.NewDecoder(f)
for {
if sortKeys {
var v any
if err = dec.Decode(&v); err != nil {
if err == io.EOF {
err = nil
}
break // ok
}
data, err := json.MarshalIndent(v, "", indent)
if err != nil {
break
}
buf.Reset()
buf.Write(data) // TODO: semi-useless copy
} else {
var m json.RawMessage
if err = dec.Decode(&m); err != nil {
if err == io.EOF {
err = nil
}
break // ok
}
buf.Reset()
if err = json.Indent(buf, m, "", indent); err != nil {
break
}
}
buf.WriteByte('\n')
if _, err = buf.WriteTo(tmp); err != nil {
break
}
}
if err != nil {
return exit(err)
}
if err := f.Close(); err != nil {
return exit(err)
}
if err := tmp.Chmod(fi.Mode()); err != nil {
return exit(err)
}
if err := tmp.Close(); err != nil {
return exit(err)
}
if err := os.Rename(tmp.Name(), name); err != nil {
return exit(err)
}
return nil
}
func formatFiles(names []string, indent string, sortKeys bool) error {
numCPU := runtime.NumCPU()
if n := len(names); n < numCPU {
numCPU = n
}
in := make(chan string, numCPU)
errCount := new(int64)
var wg sync.WaitGroup
for i := 0; i < numCPU; i++ {
wg.Add(1)
go func(in chan string, wg *sync.WaitGroup) {
defer wg.Done()
var buf bytes.Buffer
for name := range in {
if err := formatFile(name, indent, sortKeys, &buf); err != nil {
fmt.Fprintf(os.Stderr, "%s: %s\n", name, err)
atomic.AddInt64(errCount, 1)
}
}
}(in, &wg)
}
for _, name := range names {
in <- name
}
close(in)
wg.Wait()
if n := *errCount; n != 0 {
return fmt.Errorf("encountered %d errors", n)
}
return nil
}
var (
Indent uint
UseTabs bool
SortKeys bool
Compact bool
)
func parseFlags() {
const DefaultIndent = 4
flag.BoolVar(&UseTabs, "tabs", false, "Indent using tabs")
flag.BoolVar(&UseTabs, "t", false, "Indent using tabs (shorthand)")
flag.BoolVar(&SortKeys, "sort", false, "Sort keys")
flag.BoolVar(&SortKeys, "s", false, "Sort keys (shorthand)")
flag.UintVar(&Indent, "indent", DefaultIndent, "Indent this many spaces")
flag.UintVar(&Indent, "n", DefaultIndent, "Indent this many spaces (shorthand)")
flag.BoolVar(&Compact, "c", false, "Compact JSON")
flag.Parse()
}
func main() {
parseFlags()
var delim string
switch {
case UseTabs:
delim = "\t"
case Compact:
delim = ""
default:
delim = strings.Repeat(" ", int(Indent))
}
if err := formatFiles(flag.Args(), delim, SortKeys); err != nil {
fmt.Fprintf(os.Stderr, "Error: %s\n", err)
os.Exit(1)
}
}