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// Copyright 2015 Google Inc. All rights reserved
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// make-c is simple program to measure time to parse Makefiles in android.
package main
import (
"bufio"
"bytes"
"fmt"
"os/exec"
"time"
)
func main() {
parseDone := make(chan bool)
cmd := exec.Command("make", "-n")
r, err := cmd.StdoutPipe()
if err != nil {
panic(err)
}
t := time.Now()
go func() {
s := bufio.NewScanner(r)
for s.Scan() {
if bytes.HasPrefix(s.Bytes(), []byte("echo ")) {
parseDone <- true
return
}
fmt.Println(s.Text())
}
if err := s.Err(); err != nil {
panic(err)
}
panic("unexpected end of make?")
}()
err = cmd.Start()
if err != nil {
panic(err)
}
select {
case <-parseDone:
fmt.Printf("make -c: %v\n", time.Since(t))
}
cmd.Process.Kill()
cmd.Wait()
}
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