tool.go

package main

import (
	"code.google.com/p/go.tools/go/types"
	"flag"
	"fmt"
	gbuild "github.com/gopherjs/gopherjs/build"
	"github.com/gopherjs/gopherjs/compiler"
	"go/build"
	"go/scanner"
	"io/ioutil"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"syscall"
)

var currentDirectory string

func init() {
	var err error
	currentDirectory, err = os.Getwd()
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	currentDirectory, err = filepath.EvalSymlinks(currentDirectory)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}

func main() {
	flags := flag.NewFlagSet("", flag.ContinueOnError)
	cmd := "help"
	var cmdArgs []string
	if err := flags.Parse(os.Args[1:]); err == nil && flags.NArg() != 0 {
		cmd = flags.Arg(0)
		cmdArgs = flags.Args()[1:]
		if cmd == "help" && flags.NArg() == 2 {
			cmd = flags.Arg(1)
			cmdArgs = []string{"--help"}
		}
	}

	options := &gbuild.Options{CreateMapFile: true}
	switch cmd {
	case "build":
		buildFlags := flag.NewFlagSet("build command", flag.ExitOnError)
		var pkgObj string
		buildFlags.StringVar(&pkgObj, "o", "", "output file")
		buildFlags.BoolVar(&options.Verbose, "v", false, "print the names of packages as they are compiled")
		buildFlags.BoolVar(&options.Watch, "w", false, "watch for changes to the source files")
		buildFlags.BoolVar(&options.Minify, "m", false, "minify generated code")
		buildFlags.Parse(cmdArgs)

		for {
			s := gbuild.NewSession(options)

			exitCode := handleError(func() error {
				if buildFlags.NArg() == 0 {
					return s.BuildDir(currentDirectory, currentDirectory, pkgObj)
				}

				if strings.HasSuffix(buildFlags.Arg(0), ".go") {
					for _, arg := range buildFlags.Args() {
						if !strings.HasSuffix(arg, ".go") {
							return fmt.Errorf("named files must be .go files")
						}
					}
					if pkgObj == "" {
						basename := filepath.Base(buildFlags.Arg(0))
						pkgObj = basename[:len(basename)-3] + ".js"
					}
					names := make([]string, buildFlags.NArg())
					for i, name := range buildFlags.Args() {
						name = filepath.ToSlash(name)
						names[i] = name
						if s.Watcher != nil {
							s.Watcher.Watch(filepath.ToSlash(name))
						}
					}
					if err := s.BuildFiles(buildFlags.Args(), pkgObj, currentDirectory); err != nil {
						return err
					}
					return nil
				}

				for _, pkgPath := range buildFlags.Args() {
					pkgPath = filepath.ToSlash(pkgPath)
					if s.Watcher != nil {
						s.Watcher.Watch(pkgPath)
					}
					buildPkg, err := gbuild.Import(pkgPath, 0, s.ArchSuffix())
					if err != nil {
						return err
					}
					pkg := &gbuild.PackageData{Package: buildPkg}
					if err := s.BuildPackage(pkg); err != nil {
						return err
					}
					if pkgObj == "" {
						pkgObj = filepath.Base(buildFlags.Arg(0)) + ".js"
					}
					if err := s.WriteCommandPackage(pkg, pkgObj); err != nil {
						return err
					}
				}
				return nil
			})

			if s.Watcher == nil {
				os.Exit(exitCode)
			}
			s.WaitForChange()
		}

	case "install":
		installFlags := flag.NewFlagSet("install command", flag.ExitOnError)
		installFlags.BoolVar(&options.Verbose, "v", false, "print the names of packages as they are compiled")
		installFlags.BoolVar(&options.Watch, "w", false, "watch for changes to the source files")
		installFlags.BoolVar(&options.Minify, "m", false, "minify generated code")
		installFlags.Parse(cmdArgs)

		for {
			s := gbuild.NewSession(options)

			exitCode := handleError(func() error {
				pkgs := installFlags.Args()
				if len(pkgs) == 0 {
					srcDir, err := filepath.EvalSymlinks(filepath.Join(build.Default.GOPATH, "src"))
					if err != nil {
						return err
					}
					if !strings.HasPrefix(currentDirectory, srcDir) {
						return fmt.Errorf("gopherjs install: no install location for directory %s outside GOPATH", currentDirectory)
					}
					pkgPath, err := filepath.Rel(srcDir, currentDirectory)
					if err != nil {
						return err
					}
					pkgs = []string{pkgPath}
				}
				for _, pkgPath := range pkgs {
					pkgPath = filepath.ToSlash(pkgPath)
					if _, err := s.ImportPackage(pkgPath); err != nil {
						return err
					}
					pkg := s.Packages[pkgPath]
					if err := s.WriteCommandPackage(pkg, pkg.PkgObj); err != nil {
						return err
					}
				}
				return nil
			})

			if s.Watcher == nil {
				os.Exit(exitCode)
			}
			s.WaitForChange()
		}

	case "run":
		os.Exit(handleError(func() error {
			lastSourceArg := 0
			for {
				if lastSourceArg == len(cmdArgs) || !strings.HasSuffix(cmdArgs[lastSourceArg], ".go") {
					break
				}
				lastSourceArg++
			}
			if lastSourceArg == 0 {
				return fmt.Errorf("gopherjs run: no go files listed")
			}

			tempfile, err := ioutil.TempFile("", filepath.Base(cmdArgs[0])+".")
			if err != nil {
				return err
			}
			defer func() {
				tempfile.Close()
				os.Remove(tempfile.Name())
			}()
			s := gbuild.NewSession(options)
			if err := s.BuildFiles(cmdArgs[:lastSourceArg], tempfile.Name(), currentDirectory); err != nil {
				return err
			}
			if err := runNode(tempfile.Name(), cmdArgs[lastSourceArg:], ""); err != nil {
				return err
			}
			return nil
		}))

	case "test":
		testFlags := flag.NewFlagSet("test command", flag.ExitOnError)
		verbose := testFlags.Bool("v", false, "verbose")
		short := testFlags.Bool("short", false, "short")
		testFlags.Parse(cmdArgs)

		os.Exit(handleError(func() error {
			pkgs := make([]*build.Package, testFlags.NArg())
			for i, pkgPath := range testFlags.Args() {
				pkgPath = filepath.ToSlash(pkgPath)
				var err error
				pkgs[i], err = gbuild.Import(pkgPath, 0, "js")
				if err != nil {
					return err
				}
			}
			if len(pkgs) == 0 {
				srcDir, err := filepath.EvalSymlinks(filepath.Join(build.Default.GOPATH, "src"))
				if err != nil {
					return err
				}
				var pkg *build.Package
				if strings.HasPrefix(currentDirectory, srcDir) {
					pkgPath, err := filepath.Rel(srcDir, currentDirectory)
					if err != nil {
						return err
					}
					if pkg, err = gbuild.Import(pkgPath, 0, "js"); err != nil {
						return err
					}
				}
				if pkg == nil {
					if pkg, err = build.ImportDir(currentDirectory, 0); err != nil {
						return err
					}
					pkg.ImportPath = "_" + currentDirectory
				}
				pkgs = []*build.Package{pkg}
			}

			var exitErr error
			for _, buildPkg := range pkgs {
				if len(buildPkg.TestGoFiles) == 0 && len(buildPkg.XTestGoFiles) == 0 {
					fmt.Printf("?   \t%s\t[no test files]\n", buildPkg.ImportPath)
					continue
				}

				buildPkg.PkgObj = ""
				buildPkg.GoFiles = append(buildPkg.GoFiles, buildPkg.TestGoFiles...)
				pkg := &gbuild.PackageData{Package: buildPkg}
				s := gbuild.NewSession(options)
				if err := s.BuildPackage(pkg); err != nil {
					return err
				}

				mainPkg := &gbuild.PackageData{
					Package: &build.Package{
						Name:       "main",
						ImportPath: "main",
					},
					Archive: &compiler.Archive{
						ImportPath: compiler.PkgPath("main"),
					},
				}
				s.Packages["main"] = mainPkg
				s.ImportContext.Packages["main"] = types.NewPackage("main", "main")
				testingOutput, err := s.ImportPackage("testing")
				if err != nil {
					panic(err)
				}
				mainPkg.Archive.AddDependenciesOf(testingOutput)

				var mainFunc compiler.Decl
				var names []string
				var tests []string
				collectTests := func(pkg *gbuild.PackageData) {
					for _, name := range pkg.Archive.Tests {
						names = append(names, name)
						tests = append(tests, fmt.Sprintf(`$packages["%s"].%s`, pkg.ImportPath, name))
						mainFunc.DceDeps = append(mainFunc.DceDeps, compiler.DepId(pkg.ImportPath+":"+name))
					}
					mainPkg.Archive.AddDependenciesOf(pkg.Archive)
				}

				collectTests(pkg)
				if len(pkg.XTestGoFiles) != 0 {
					testPkg := &gbuild.PackageData{Package: &build.Package{
						ImportPath: pkg.ImportPath + "_test",
						Dir:        pkg.Dir,
						GoFiles:    pkg.XTestGoFiles,
					}}
					if err := s.BuildPackage(testPkg); err != nil {
						return err
					}
					collectTests(testPkg)
				}

				mainFunc.DceDeps = append(mainFunc.DceDeps, compiler.DepId("flag:Parse"))
				mainFunc.BodyCode = []byte(fmt.Sprintf(`
					$pkg.main = function() {
						var testing = $packages["testing"];
						testing.Main2("%s", "%s", new ($sliceType($String))(["%s"]), new ($sliceType($funcType([testing.T.Ptr], [], false)))([%s]));
					};
				`, pkg.ImportPath, pkg.Dir, strings.Join(names, `", "`), strings.Join(tests, ", ")))

				mainPkg.Archive.Declarations = []compiler.Decl{mainFunc}
				mainPkg.Archive.AddDependency("main")

				tempfile, err := ioutil.TempFile("", "test.")
				if err != nil {
					return err
				}
				defer func() {
					tempfile.Close()
					os.Remove(tempfile.Name())
				}()

				if err := s.WriteCommandPackage(mainPkg, tempfile.Name()); err != nil {
					return err
				}

				var args []string
				if *verbose {
					args = append(args, "-test.v")
				}
				if *short {
					args = append(args, "-test.short")
				}
				if err := runNode(tempfile.Name(), args, ""); err != nil {
					if _, ok := err.(*exec.ExitError); !ok {
						return err
					}
					exitErr = err
				}
			}
			return exitErr
		}))

	case "tool":
		tool := cmdArgs[0]
		toolFlags := flag.NewFlagSet("tool command", flag.ExitOnError)
		toolFlags.Bool("e", false, "")
		toolFlags.Bool("l", false, "")
		toolFlags.Bool("m", false, "")
		toolFlags.String("o", "", "")
		toolFlags.String("D", "", "")
		toolFlags.String("I", "", "")
		toolFlags.Parse(flags.Args()[2:])

		os.Exit(handleError(func() error {
			if len(tool) == 2 {
				switch tool[1] {
				case 'g':
					basename := filepath.Base(toolFlags.Arg(0))
					s := gbuild.NewSession(options)
					if err := s.BuildFiles([]string{toolFlags.Arg(0)}, basename[:len(basename)-3]+".js", currentDirectory); err != nil {
						return err
					}
					return nil
				}
			}
			return fmt.Errorf("Tool not supported: " + tool)
		}))

	case "help", "":
		os.Stderr.WriteString(`GopherJS is a tool for compiling Go source code to JavaScript.

Usage:

    gopherjs command [arguments]

The commands are:

    build       compile packages and dependencies
    install     compile and install packages and dependencies
    run         compile and run Go program (requires Node.js)
    test        test packages (requires Node.js)

Use "go help [command]" for more information about a command.

`)

	default:
		fmt.Fprintf(os.Stderr, "gopherjs: unknown subcommand \"%s\"\nRun 'gopherjs help' for usage.\n", cmd)

	}
}

func handleError(f func() error) int {
	switch err := f().(type) {
	case nil:
		return 0
	case compiler.ErrorList:
		makeRel := func(name string) string {
			if relname, err := filepath.Rel(currentDirectory, name); err == nil {
				if relname[0] != '.' {
					return "." + string(filepath.Separator) + relname
				}
				return relname
			}
			return name
		}
		for _, entry := range err {
			switch e := entry.(type) {
			case *scanner.Error:
				fmt.Fprintf(os.Stderr, "\x1B[31m%s:%d:%d: %s\x1B[39m\n", makeRel(e.Pos.Filename), e.Pos.Line, e.Pos.Column, e.Msg)
			case types.Error:
				pos := e.Fset.Position(e.Pos)
				fmt.Fprintf(os.Stderr, "\x1B[31m%s:%d:%d: %s\x1B[39m\n", makeRel(pos.Filename), pos.Line, pos.Column, e.Msg)
			default:
				fmt.Fprintf(os.Stderr, "\x1B[31m%s\x1B[39m\n", entry)
			}
		}
		return 1
	case *exec.ExitError:
		return err.Sys().(syscall.WaitStatus).ExitStatus()
	default:
		fmt.Fprintf(os.Stderr, "\x1B[31m%s\x1B[39m\n", err)
		return 1
	}
}

func runNode(script string, args []string, dir string) error {
	node := exec.Command("node", append([]string{script}, args...)...)
	node.Dir = dir
	node.Stdin = os.Stdin
	node.Stdout = os.Stdout
	node.Stderr = os.Stderr
	if err := node.Run(); err != nil {
		return fmt.Errorf("could not run Node.js: %s", err.Error())
	}
	return nil
}