Fumitoshi Ukai | f9b6ec7 | 2015-06-16 14:51:03 +0900 | [diff] [blame] | 1 | // Copyright 2015 Google Inc. All rights reserved |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | // make-c is simple program to measure time to parse Makefiles in android. |
| 16 | package main |
| 17 | |
| 18 | import ( |
| 19 | "bufio" |
| 20 | "bytes" |
| 21 | "fmt" |
| 22 | "os/exec" |
| 23 | "time" |
| 24 | ) |
| 25 | |
| 26 | func main() { |
| 27 | parseDone := make(chan bool) |
| 28 | cmd := exec.Command("make", "-n") |
| 29 | r, err := cmd.StdoutPipe() |
| 30 | if err != nil { |
| 31 | panic(err) |
| 32 | } |
| 33 | t := time.Now() |
| 34 | go func() { |
| 35 | s := bufio.NewScanner(r) |
| 36 | for s.Scan() { |
| 37 | if bytes.HasPrefix(s.Bytes(), []byte("echo ")) { |
| 38 | parseDone <- true |
| 39 | return |
| 40 | } |
| 41 | fmt.Println(s.Text()) |
| 42 | } |
| 43 | if err := s.Err(); err != nil { |
| 44 | panic(err) |
| 45 | } |
| 46 | panic("unexpected end of make?") |
| 47 | }() |
| 48 | err = cmd.Start() |
| 49 | if err != nil { |
| 50 | panic(err) |
| 51 | } |
| 52 | select { |
| 53 | case <-parseDone: |
| 54 | fmt.Printf("make -c: %v\n", time.Since(t)) |
| 55 | } |
| 56 | cmd.Process.Kill() |
| 57 | cmd.Wait() |
| 58 | } |