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// Copyright 2019 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.
//go:build !js && !wasip1
// TODO(@musiol, @odeke-em): re-unify this entire file back into
// example.go when js/wasm gets an os.Pipe implementation
// and no longer needs this separation.
package testing
import (
"fmt"
"io"
"os"
"strings"
"time"
)
func runExample(eg InternalExample) (ok bool) {
if chatty.on {
fmt.Printf("%s=== RUN %s\n", chatty.prefix(), eg.Name)
}
// Capture stdout.
stdout := os.Stdout
r, w, err := os.Pipe()
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
os.Stdout = w
outC := make(chan string)
go func() {
var buf strings.Builder
_, err := io.Copy(&buf, r)
r.Close()
if err != nil {
fmt.Fprintf(os.Stderr, "testing: copying pipe: %v\n", err)
os.Exit(1)
}
outC <- buf.String()
}()
finished := false
start := time.Now()
// Clean up in a deferred call so we can recover if the example panics.
defer func() {
timeSpent := time.Since(start)
// Close pipe, restore stdout, get output.
w.Close()
os.Stdout = stdout
out := <-outC
err := recover()
ok = eg.processRunResult(out, timeSpent, finished, err)
}()
// Run example.
eg.F()
finished = true
return
}