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package main
import (
"bytes"
"flag"
"fmt"
"io"
"io/fs"
"os"
"path/filepath"
"runtime"
"strings"
"sync"
)
var version = "dev"
var (
writeFlag = flag.Bool("w", false, "write result to (source) file instead of stdout")
listFlag = flag.Bool("l", false, "list files whose formatting differs from iku's")
diffFlag = flag.Bool("d", false, "display diffs instead of rewriting files")
commentsFlag = flag.String("comments", "follow", "comment attachment mode: follow, precede, standalone")
versionFlag = flag.Bool("version", false, "print version")
)
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "usage: iku [flags] [path ...]\n")
flag.PrintDefaults()
}
flag.Parse()
if *versionFlag {
fmt.Printf("%s (%s)\n", version, runtime.Version())
os.Exit(0)
}
commentMode, err := parseCommentMode(*commentsFlag)
if err != nil {
fmt.Fprintf(os.Stderr, "iku: %v\n", err)
os.Exit(2)
}
formatter := &Formatter{CommentMode: commentMode}
if flag.NArg() == 0 {
if *writeFlag {
fmt.Fprintln(os.Stderr, "iku: cannot use -w with standard input")
os.Exit(2)
}
if err := processFile(formatter, "<stdin>", os.Stdin, os.Stdout, false); err != nil {
fmt.Fprintf(os.Stderr, "iku: %v\n", err)
os.Exit(1)
}
return
}
exitCode := 0
for _, argumentPath := range flag.Args() {
switch fileInfo, err := os.Stat(argumentPath); {
case err != nil:
fmt.Fprintf(os.Stderr, "iku: %v\n", err)
exitCode = 1
case fileInfo.IsDir():
if err := processDirectory(formatter, argumentPath, &exitCode); err != nil {
fmt.Fprintf(os.Stderr, "iku: %v\n", err)
exitCode = 1
}
default:
if err := processFilePath(formatter, argumentPath, &exitCode); err != nil {
fmt.Fprintf(os.Stderr, "iku: %v\n", err)
exitCode = 1
}
}
}
os.Exit(exitCode)
}
func parseCommentMode(commentModeString string) (CommentMode, error) {
switch strings.ToLower(commentModeString) {
case "follow":
return CommentsFollow, nil
case "precede":
return CommentsPrecede, nil
case "standalone":
return CommentsStandalone, nil
default:
return 0, fmt.Errorf("invalid comment mode: %q (use follow, precede, or standalone)", commentModeString)
}
}
var supportedFileExtensions = map[string]bool{
".go": true,
".js": true,
".ts": true,
".jsx": true,
".tsx": true,
}
func processDirectory(formatter *Formatter, directoryPath string, exitCode *int) error {
var sourceFilePaths []string
err := filepath.WalkDir(directoryPath, func(currentPath string, dirEntry fs.DirEntry, err error) error {
if err != nil {
return err
}
if !dirEntry.IsDir() && supportedFileExtensions[filepath.Ext(currentPath)] {
sourceFilePaths = append(sourceFilePaths, currentPath)
}
return nil
})
if err != nil {
return err
}
var waitGroup sync.WaitGroup
var mutex sync.Mutex
semaphore := make(chan struct{}, runtime.NumCPU())
for _, filePath := range sourceFilePaths {
waitGroup.Add(1)
go func(currentFilePath string) {
defer waitGroup.Done()
semaphore <- struct{}{}
defer func() { <-semaphore }()
if err := processFilePath(formatter, currentFilePath, exitCode); err != nil {
mutex.Lock()
fmt.Fprintf(os.Stderr, "iku: %v\n", err)
*exitCode = 1
mutex.Unlock()
}
}(filePath)
}
waitGroup.Wait()
return nil
}
func processFilePath(formatter *Formatter, filePath string, _ *int) error {
sourceFile, err := os.Open(filePath)
if err != nil {
return err
}
defer func() { _ = sourceFile.Close() }()
var outputDestination io.Writer = os.Stdout
if *writeFlag {
outputDestination = nil
}
return processFile(formatter, filePath, sourceFile, outputDestination, true)
}
func processFile(formatter *Formatter, filename string, inputReader io.Reader, outputWriter io.Writer, isFile bool) error {
sourceContent, err := io.ReadAll(inputReader)
if err != nil {
return fmt.Errorf("%s: %v", filename, err)
}
formattedResult, err := formatter.Format(sourceContent, filename)
if err != nil {
return fmt.Errorf("%s: %v", filename, err)
}
if *listFlag {
if !bytes.Equal(sourceContent, formattedResult) {
fmt.Println(filename)
}
return nil
}
if *diffFlag {
if !bytes.Equal(sourceContent, formattedResult) {
diffOutput := unifiedDiff(filename, sourceContent, formattedResult)
_, _ = os.Stdout.Write(diffOutput)
}
return nil
}
if *writeFlag && isFile {
if !bytes.Equal(sourceContent, formattedResult) {
return os.WriteFile(filename, formattedResult, 0644)
}
return nil
}
if outputWriter != nil {
_, err = outputWriter.Write(formattedResult)
return err
}
return nil
}
func unifiedDiff(filename string, originalSource, formattedSource []byte) []byte {
var outputBuffer bytes.Buffer
fmt.Fprintf(&outputBuffer, "--- %s\n", filename)
fmt.Fprintf(&outputBuffer, "+++ %s\n", filename)
originalSourceLines := strings.Split(string(originalSource), "\n")
formattedSourceLines := strings.Split(string(formattedSource), "\n")
fmt.Fprintf(&outputBuffer, "@@ -1,%d +1,%d @@\n", len(originalSourceLines), len(formattedSourceLines))
for _, currentLine := range originalSourceLines {
fmt.Fprintf(&outputBuffer, "-%s\n", currentLine)
}
for _, currentLine := range formattedSourceLines {
fmt.Fprintf(&outputBuffer, "+%s\n", currentLine)
}
return outputBuffer.Bytes()
}
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