1// Copyright 2019 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5//go:build !js
6// +build !js
7
8// TODO(@musiol, @odeke-em): re-unify this entire file back into
9// example.go when js/wasm gets an os.Pipe implementation
10// and no longer needs this separation.
11
12package testing
13
14import (
15	"fmt"
16	"io"
17	"os"
18	"strings"
19	"time"
20)
21
22func runExample(eg InternalExample) (ok bool) {
23	if *chatty {
24		fmt.Printf("=== RUN   %s\n", eg.Name)
25	}
26
27	// Capture stdout.
28	stdout := os.Stdout
29	r, w, err := os.Pipe()
30	if err != nil {
31		fmt.Fprintln(os.Stderr, err)
32		os.Exit(1)
33	}
34	os.Stdout = w
35	outC := make(chan string)
36	go func() {
37		var buf strings.Builder
38		_, err := io.Copy(&buf, r)
39		r.Close()
40		if err != nil {
41			fmt.Fprintf(os.Stderr, "testing: copying pipe: %v\n", err)
42			os.Exit(1)
43		}
44		outC <- buf.String()
45	}()
46
47	finished := false
48	start := time.Now()
49
50	// Clean up in a deferred call so we can recover if the example panics.
51	defer func() {
52		timeSpent := time.Since(start)
53
54		// Close pipe, restore stdout, get output.
55		w.Close()
56		os.Stdout = stdout
57		out := <-outC
58
59		err := recover()
60		ok = eg.processRunResult(out, timeSpent, finished, err)
61	}()
62
63	// Run example.
64	eg.F()
65	finished = true
66	return
67}
68