func watchTask(root string, logName string, handler func(e *watcher.FileEvent)) {
bufferSize := 2048
watchr, err := watcher.NewWatcher(bufferSize)
if err != nil {
util.Panic("project", "%v\n", err)
}
watchr.WatchRecursive(root)
watchr.ErrorHandler = func(err error) {
util.Error("project", "%v\n", err)
}
// this function will block forever, Ctrl+C to quit app
var lastHappenedTime int64
firstTime := true
for {
if firstTime {
util.Info(logName, "watching %s ...\n", root)
firstTime = false
}
event := <-watchr.Event
//util.Debug("DBG", "watchr.Event %+v\n", event)
isOlder := event.UnixNano < lastHappenedTime
lastHappenedTime = event.UnixNano
if isOlder {
continue
}
handler(event)
}
}
// Expands glob patterns.
func (task *Task) expandGlobs() {
files, regexps, err := Glob(task.WatchGlobs)
if err != nil {
util.Error(task.Name, "%v", err)
return
}
task.WatchRegexps = regexps
task.WatchFiles = files
}
// RunWithEvent runs this task when triggered from a watch.
// *e* FileEvent contains information about the file/directory which changed
// in watch mode.
func (task *Task) RunWithEvent(logName string, e *watcher.FileEvent) error {
if task.RunOnce && task.Complete {
//util.Debug(task.Name, "Already ran\n")
return nil
}
start := time.Now()
if len(task.WatchGlobs) > 0 && len(task.WatchFiles) == 0 {
task.expandGlobs()
if len(task.WatchFiles) == 0 {
util.Error("task", "\""+task.Name+"\" '%v' did not match any files\n", task.WatchGlobs)
}
}
// Run this task only if the file matches watch Regexps
rebuilt := ""
if e != nil {
rebuilt = "rebuilt "
if !task.isWatchedFile(e) {
return nil
}
if verbose {
util.Debug(logName, "%s\n", e.String())
}
}
var err error
log := true
if task.Handler != nil {
context := Context{Task: task, Args: contextArgm}
err = task.Handler.Handle(&context)
if err != nil {
return fmt.Errorf("%q: %s", logName, err.Error())
}
} else if len(task.Dependencies) > 0 {
// no need to log if just dependency
log = false
} else {
util.Info(task.Name, "Ignored. Task does not have a handler or dependencies.\n")
return nil
}
elapsed := time.Now().Sub(start)
if log {
util.Info(logName, "%s%vms\n", rebuilt, elapsed.Nanoseconds()/1e6)
}
task.Complete = true
return nil
}
func (project *Project) mustTask(name string) (*Project, *Task) {
namespace, taskName := project.namespaceTaskName(name)
proj := project.Namespace[namespace]
if proj == nil {
util.Panic("project", "Could not find project having namespace \"%s\"\n", namespace)
}
task := proj.Tasks[taskName]
if task == nil {
util.Error("ERR", `"%s" task is not defined`+"\n", name)
os.Exit(1)
}
return proj, task
}
func killSpawned(command string) {
process := Processes[command]
if process == nil {
return
}
err := process.Kill()
delete(Processes, command)
if err != nil {
util.Error("Start", "Could not kill existing process %+v\n%s\n", process, err.Error())
return
}
if verbose {
util.Debug("#", "Processes[%q] killed\n", command)
}
}
// Watch watches the Files of a task and reruns the task on a watch event. Any
// direct dependency is also watched. Returns true if watching.
func (project *Project) Watch(names []string, isParent bool) bool {
funcs := []func(){}
taskClosure := func(project *Project, task *Task, taskname string, logName string) func() {
globs, _ := project.gatherWatchInfo(task)
paths := calculateWatchPaths(globs)
return func() {
if len(paths) == 0 {
return
}
for _, pth := range paths {
go func(path string) {
watchTask(path, logName, func(e *watcher.FileEvent) {
err := project.run(taskname, taskname, e)
if err != nil {
util.Error("ERR", "%s\n", err.Error())
}
})
}(pth)
}
}
}
for _, taskname := range names {
proj, task := project.mustTask(taskname)
if len(task.WatchFiles) > 0 {
funcs = append(funcs, taskClosure(proj, task, taskname, taskname))
}
}
if len(funcs) > 0 {
done := all(funcs)
<-done
return true
}
return false
}
func checkError(err error, format string, args ...interface{}) {
if err != nil {
util.Error("ERR", format, args...)
os.Exit(1)
}
}
func godo(tasksFunc func(*Project), argv []string) {
if argv == nil {
argm = minimist.Parse()
} else {
argm = minimist.ParseArgv(argv)
}
help = argm.ZeroBool("help", "h", "?")
verbose = argm.ZeroBool("verbose", "v")
version = argm.ZeroBool("version", "V")
watching = argm.ZeroBool("watch", "w")
deprecatedWarnings = argm.ZeroBool("D")
contextArgm = minimist.ParseArgv(argm.Unparsed())
project := NewProject(tasksFunc)
if help {
Usage(project.usage())
os.Exit(0)
}
if version {
fmt.Printf("godo %s\n", Version)
os.Exit(0)
}
// Run each task including their dependencies.
args := []string{}
for _, v := range argm.Leftover() {
args = append(args, fmt.Sprintf("%v", v))
}
if len(args) == 0 {
if project.Tasks["default"] != nil {
args = append(args, "default")
} else {
Usage(project.usage())
os.Exit(0)
}
}
// quick fix to make cascading watch work on default task
if len(args) == 1 && args[0] == "default" {
args = project.Tasks["default"].Dependencies
}
for _, name := range args {
err := project.Run(name)
if err != nil {
util.Error("ERR", "%s\n", err.Error())
os.Exit(1)
}
}
if watching {
if project.Watch(args, true) {
waitgroup.Add(1)
waitExit = true
} else {
fmt.Println("Nothing to watch. Use W{} or Watch{} to specify glob patterns")
os.Exit(0)
}
}
if waitExit {
waitgroup.Wait()
}
}
