forked from ddollar/rerun
/
rerun.go
222 lines (173 loc) · 3.82 KB
/
rerun.go
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// Copyright 2013 The rerun AUTHORS. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"bytes"
"errors"
"flag"
"fmt"
"os"
"os/exec"
"path"
"path/filepath"
"time"
"go/build"
)
var (
do_tests = flag.Bool("test", false, "Run tests (before running program)")
do_build = flag.Bool("build", false, "Build program")
ignore = flag.Bool("no-git", true, "ignore .git directory")
)
func buildpathDir(buildpath string) (string, error) {
pkg, err := build.Import(buildpath, "", 0)
if err != nil {
return "", err
}
if pkg.Goroot {
return "", err
}
return pkg.Dir, nil
}
type scanCallback func(path string)
func scanChanges(path string, cb scanCallback) {
last := time.Now()
for {
filepath.Walk(path, func(p string, info os.FileInfo, err error) error {
if *ignore && info.IsDir() && p == filepath.Join(path, ".git") {
return filepath.SkipDir
}
if info.ModTime().After(last) {
cb(path)
last = time.Now()
}
return nil
})
time.Sleep(500 * time.Millisecond)
}
}
func log(format string, args ...interface{}) {
fmt.Printf("[rerun] %s", fmt.Sprintf(format+"\n", args...))
}
func gobuild(buildpath string) (bool, error) {
cmd := exec.Command("go", "build", "-v", buildpath)
buf := bytes.NewBuffer([]byte{})
cmd.Stdout = buf
cmd.Stderr = buf
if err := cmd.Run(); err != nil {
log("build failed")
fmt.Println(buf.String())
return false, err
}
log("build succeeded")
return true, nil
}
func goinstall(buildpath string) (bool, error) {
cmd := exec.Command("go", "get", buildpath)
buf := bytes.NewBuffer([]byte{})
cmd.Stdout = buf
cmd.Stderr = buf
if err := cmd.Run(); err != nil {
log("install failed")
fmt.Println(buf.String())
return false, err
}
log("install succeeded")
return true, nil
}
func gotest(buildpath string) (bool, error) {
cmd := exec.Command("go", "test", "-v", buildpath)
buf := bytes.NewBuffer([]byte{})
cmd.Stdout = buf
cmd.Stderr = buf
if err := cmd.Run(); err != nil {
log("tests failed")
fmt.Println(buf.String())
return false, err
}
log("tests passed")
return true, nil
}
func run(ch chan bool, bin string, args []string) {
go func() {
var proc *os.Process
for relaunch := range ch {
if proc != nil {
if err := proc.Signal(os.Interrupt); err != nil {
proc.Kill()
}
proc.Wait()
}
if !relaunch {
continue
}
cmd := exec.Command(bin, args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Start(); err != nil {
log("error: %s", err)
}
proc = cmd.Process
}
}()
return
}
func refresh(buildpath string, ch chan bool) {
if *do_tests {
if ok, _ := gotest(buildpath); !ok {
ch <- false
return
}
}
if *do_build {
if ok, _ := gobuild(buildpath); !ok {
ch <- false
return
}
}
if ok, _ := goinstall(buildpath); !ok {
ch <- false
return
}
ch <- true
return
}
func rerun(buildpath string, args []string) (err error) {
pkg, err := build.Import(buildpath, "", 0)
if err != nil {
return
}
if pkg.Name != "main" {
err = errors.New(fmt.Sprintf("expected package %q, got %q", "main", pkg.Name))
return
}
_, name := path.Split(buildpath)
bin := filepath.Join(pkg.BinDir, name)
ch := make(chan bool)
go run(ch, bin, args)
refresh(buildpath, ch)
dir, err := buildpathDir(buildpath)
if err != nil {
return
}
scanChanges(dir, func(path string) {
log("change detected")
refresh(buildpath, ch)
})
return
}
func main() {
flag.Parse()
if len(flag.Args()) < 1 {
fmt.Println("Usage: rerun [--no-git] [--test] [--no-run] [--build] [--race] <import path> [arg]*")
os.Exit(1)
}
if *ignore {
log("ignoring .git dir")
}
buildpath := flag.Args()[0]
args := flag.Args()[1:]
if err := rerun(buildpath, args); err != nil {
log("error: %s", err)
}
}