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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"flag";
"fmt";
"go/ast";
"go/parser";
"go/printer";
"go/scanner";
"io";
"os";
pathutil "path";
"sort";
"strings";
)
const pkgDir = "src/pkg"; // relative to $GOROOT
var (
goroot = flag.String("goroot", os.Getenv("GOROOT"), "Go root directory");
// 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");
// layout control
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");
optcommas = flag.Bool("optcommas", false, "print optional commas");
optsemis = flag.Bool("optsemis", false, "print optional semicolons");
reverse = flag.Bool("reverse", false, "print top-level declarations in reverse order without forward-declarations");
)
func usage() {
fmt.Fprintf(os.Stderr, "usage: gofmt [flags] [file.go | pkgpath]\n");
flag.PrintDefaults();
os.Exit(2);
}
func parserMode() uint {
mode := uint(0);
if !*comments {
mode |= parser.ParseComments;
}
if *verbose {
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 {
mode |= printer.RawFormat;
}
if *usespaces {
mode |= printer.UseSpaces;
}
if *optcommas {
mode |= printer.OptCommas;
}
if *optsemis {
mode |= printer.OptSemis;
}
if *reverse {
mode |= printer.Reverse;
}
return mode;
}
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);
}
}
}
}
}
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