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mirror of https://github.com/golang/go synced 2024-11-25 02:57:57 -07:00

Updated and simplified gofmt.

- operates on stdin, a single file, or all files in a file tree
- setting -w flag writes to (source) file instead of stdout
- setting -l flag lists files whose formatting has changed

R=rsc
DELTA=201  (102 added, 71 deleted, 28 changed)
OCL=35890
CL=35926
This commit is contained in:
Robert Griesemer 2009-10-20 12:07:31 -07:00
parent fcc4be8c65
commit 4213c22301
2 changed files with 131 additions and 100 deletions

View File

@ -5,40 +5,45 @@
package main
import (
"flag";
"fmt";
"go/ast";
"go/parser";
"go/printer";
"go/scanner";
"os";
pathutil "path";
"strings";
"bytes";
"flag";
"fmt";
"go/parser";
"go/printer";
"go/scanner";
"io";
"os";
pathutil "path";
"strings";
)
const pkgDir = "src/pkg" // relative to $GOROOT
var (
goroot = flag.String("goroot", os.Getenv("GOROOT"), "Go root directory");
// main operation modes
list = flag.Bool("l", false, "list files whose formatting differs from gofmt's");
write = flag.Bool("w", false, "write result to (source) file instead of stdout");
// operation modes
allgo = flag.Bool("a", false, "include all .go files for package");
comments = flag.Bool("c", false, "omit comments");
silent = flag.Bool("s", false, "silent mode: parsing only");
verbose = flag.Bool("v", false, "verbose mode: trace parsing");
exports = flag.Bool("x", false, "show exports only");
// debugging support
comments = flag.Bool("comments", true, "print comments");
trace = flag.Bool("trace", false, "print names of processed files to stderr and parse traces to stdout");
// layout control
align = flag.Bool("align", true, "align columns");
tabwidth = flag.Int("tabwidth", 8, "tab width");
rawformat = flag.Bool("rawformat", false, "do not use a tabwriter");
usespaces = flag.Bool("spaces", false, "align with blanks instead of tabs");
usespaces = flag.Bool("spaces", false, "align with spaces instead of tabs");
)
var exitCode = 0
func report(err os.Error) {
scanner.PrintError(os.Stderr, err);
exitCode = 2;
}
func usage() {
fmt.Fprintf(os.Stderr, "usage: gofmt [flags] [file.go | pkgpath]\n");
fmt.Fprintf(os.Stderr, "usage: gofmt [flags] [path ...]\n");
flag.PrintDefaults();
os.Exit(2);
}
@ -46,61 +51,19 @@ func usage() {
func parserMode() uint {
mode := uint(0);
if !*comments {
if *comments {
mode |= parser.ParseComments;
}
if *verbose {
if *trace {
mode |= parser.Trace;
}
return mode;
}
func isPkgFile(d *os.Dir) bool {
// ignore non-Go files
if !d.IsRegular() || strings.HasPrefix(d.Name, ".") || !strings.HasSuffix(d.Name, ".go") {
return false;
}
// ignore test files unless explicitly included
return *allgo || !strings.HasSuffix(d.Name, "_test.go");
}
func getPackage(path string) (*ast.Package, os.Error) {
if len(path) == 0 {
return nil, os.NewError("no path specified");
}
if strings.HasSuffix(path, ".go") || path == "/dev/stdin" {
// single go file
src, err := parser.ParseFile(path, nil, parserMode());
if err != nil {
return nil, err;
}
dirname, filename := pathutil.Split(path);
return &ast.Package{src.Name.Value, dirname, map[string]*ast.File{filename: src}}, nil;
}
// len(path) > 0
switch ch := path[0]; {
case ch == '.':
// cwd-relative path
if cwd, err := os.Getwd(); err == nil {
path = pathutil.Join(cwd, path);
}
case ch != '/':
// goroot/pkgDir-relative path
path = pathutil.Join(pathutil.Join(*goroot, pkgDir), path);
}
return parser.ParsePackage(path, isPkgFile, parserMode());
}
func printerMode() uint {
mode := uint(0);
if *rawformat {
if !*align {
mode |= printer.RawFormat;
}
if *usespaces {
@ -110,42 +73,110 @@ func printerMode() uint {
}
func isGoFile(d *os.Dir) bool {
// ignore non-Go files
return d.IsRegular() && !strings.HasPrefix(d.Name, ".") && strings.HasSuffix(d.Name, ".go");
}
func processFile(filename string) os.Error {
if *trace {
fmt.Fprintln(os.Stderr, filename);
}
src, err := io.ReadFile(filename);
if err != nil {
return err;
}
file, err := parser.ParseFile(filename, src, parserMode());
if err != nil {
return err;
}
var res bytes.Buffer;
_, err = printer.Fprint(&res, file, printerMode(), *tabwidth);
if err != nil {
return err;
}
if bytes.Compare(src, res.Bytes()) != 0 {
// formatting has changed
if *list {
fmt.Fprintln(os.Stdout, filename);
}
if *write {
err = io.WriteFile(filename, res.Bytes(), 0);
if err != nil {
return err;
}
}
}
if !*list && !*write {
_, err = os.Stdout.Write(res.Bytes());
}
return err;
}
type fileVisitor chan os.Error
func (v fileVisitor) VisitDir(path string, d *os.Dir) bool {
return true;
}
func (v fileVisitor) VisitFile(path string, d *os.Dir) {
if isGoFile(d) {
v <- nil; // synchronize error handler
if err := processFile(path); err != nil {
v <- err;
}
}
}
func walkDir(path string) {
// start an error handler
v := make(fileVisitor);
go func() {
for err := range v {
if err != nil {
report(err);
}
}
}();
// walk the tree
pathutil.Walk(path, v, v);
close(v);
}
func main() {
flag.Usage = usage;
flag.Parse();
path := "";
switch flag.NArg() {
case 0:
path = "/dev/stdin";
case 1:
path = flag.Arg(0);
default:
usage();
}
pkg, err := getPackage(path);
if err != nil {
scanner.PrintError(os.Stderr, err);
os.Exit(1);
}
if !*silent {
if *exports {
ast.PackageExports(pkg);
_, err := printer.Fprint(os.Stdout, ast.MergePackageFiles(pkg), printerMode(), *tabwidth);
if err != nil {
fmt.Fprint(os.Stderr, err);
os.Exit(2);
}
} else {
for _, src := range pkg.Files {
_, err := printer.Fprint(os.Stdout, src, printerMode(), *tabwidth);
if err != nil {
fmt.Fprint(os.Stderr, err);
os.Exit(2);
}
}
if flag.NArg() == 0 {
if err := processFile("/dev/stdin"); err != nil {
report(err);
}
}
for i := 0; i < flag.NArg(); i++ {
path := flag.Arg(i);
switch dir, err := os.Stat(path); {
case err != nil:
report(err);
case dir.IsRegular():
if err := processFile(path); err != nil {
report(err);
}
case dir.IsDirectory():
walkDir(path);
}
}
os.Exit(exitCode);
}

View File

@ -70,7 +70,7 @@ cleanup() {
silent() {
cleanup
$CMD -s $1 > $TMP1
$CMD $1 > /dev/null 2> $TMP1
if [ $? != 0 ]; then
cat $TMP1
echo "Error (silent mode test): test.sh $1"