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