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54 lines
1.5 KiB
Go
54 lines
1.5 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package testtext
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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)
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// CodeSize builds the given code sample and returns the binary size or en error
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// if an error occurred. The code sample typically will look like this:
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// package main
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// import "golang.org/x/text/somepackage"
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// func main() {
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// somepackage.Func() // reference Func to cause it to be linked in.
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// }
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// See dict_test.go in the display package for an example.
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func CodeSize(s string) (int, error) {
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// Write the file.
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tmpdir, err := ioutil.TempDir(os.TempDir(), "testtext")
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if err != nil {
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return 0, fmt.Errorf("testtext: failed to create tmpdir: %v", err)
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}
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defer os.RemoveAll(tmpdir)
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filename := filepath.Join(tmpdir, "main.go")
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if err := ioutil.WriteFile(filename, []byte(s), 0644); err != nil {
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return 0, fmt.Errorf("testtext: failed to write main.go: %v", err)
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}
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// Build the binary.
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w := &bytes.Buffer{}
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cmd := exec.Command(filepath.Join(runtime.GOROOT(), "bin", "go"), "build", "-o", "main")
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cmd.Dir = tmpdir
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cmd.Stderr = w
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cmd.Stdout = w
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if err := cmd.Run(); err != nil {
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return 0, fmt.Errorf("testtext: failed to execute command: %v\nmain.go:\n%vErrors:%s", err, s, w)
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}
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// Determine the size.
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fi, err := os.Stat(filepath.Join(tmpdir, "main"))
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if err != nil {
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return 0, fmt.Errorf("testtext: failed to get file info: %v", err)
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}
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return int(fi.Size()), nil
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}
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