1 files changed, 85 insertions, 0 deletions
diff --git a/src/cmd/go/run.go b/src/cmd/go/run.go
new file mode 100644
index 000000000..94cd59296
--- /dev/null
+++ b/src/cmd/go/run.go
@@ -0,0 +1,85 @@
+// Copyright 2011 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 (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+var cmdRun = &Command{
+	UsageLine: "run [build flags] gofiles... [arguments...]",
+	Short:     "compile and run Go program",
+	Long: `
+Run compiles and runs the main package comprising the named Go source files.
+
+For more about build flags, see 'go help build'.
+
+See also: go build.
+	`,
+}
+
+func init() {
+	cmdRun.Run = runRun // break init loop
+
+	addBuildFlags(cmdRun)
+}
+
+func printStderr(args ...interface{}) (int, error) {
+	return fmt.Fprint(os.Stderr, args...)
+}
+
+func runRun(cmd *Command, args []string) {
+	var b builder
+	b.init()
+	b.print = printStderr
+	i := 0
+	for i < len(args) && strings.HasSuffix(args[i], ".go") {
+		i++
+	}
+	files, cmdArgs := args[:i], args[i:]
+	if len(files) == 0 {
+		fatalf("go run: no go files listed")
+	}
+	p := goFilesPackage(files)
+	if p.Error != nil {
+		fatalf("%s", p.Error)
+	}
+	if p.Name != "main" {
+		fatalf("go run: cannot run non-main package")
+	}
+	p.target = "" // must build - not up to date
+	a1 := b.action(modeBuild, modeBuild, p)
+	a := &action{f: (*builder).runProgram, args: cmdArgs, deps: []*action{a1}}
+	b.do(a)
+}
+
+// runProgram is the action for running a binary that has already
+// been compiled.  We ignore exit status.
+func (b *builder) runProgram(a *action) error {
+	if buildN || buildX {
+		b.showcmd("", "%s %s", a.deps[0].target, strings.Join(a.args, " "))
+		if buildN {
+			return nil
+		}
+	}
+
+	runStdin(a.deps[0].target, a.args)
+	return nil
+}
+
+// runStdin is like run, but connects Stdin.
+func runStdin(cmdargs ...interface{}) {
+	cmdline := stringList(cmdargs...)
+	cmd := exec.Command(cmdline[0], cmdline[1:]...)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		errorf("%v", err)
+	}
+}