128 lines
2.3 KiB
Go
128 lines
2.3 KiB
Go
// +build disabled
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package main
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import (
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"fmt"
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"io/ioutil"
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"log"
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"net/http"
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"os/exec"
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"path/filepath"
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"github.com/fsnotify/fsnotify"
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)
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func main() {
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const wasm = "/doodle.wasm"
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// Watch the dev directory for changes.
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go watchChanges()
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http.Handle("/", http.FileServer(http.Dir(".")))
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http.HandleFunc(wasm, func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "application/wasm")
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http.ServeFile(w, r, "."+wasm)
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})
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fmt.Println("Listening at http://localhost:8080/")
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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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// onChange handler to rebuild the wasm file automatically.
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func onChange() {
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out, err := exec.Command("make").Output()
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if err != nil {
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log.Printf("error: %s", err)
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}
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log.Printf("%s", out)
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log.Printf("Doodle WASM file rebuilt")
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}
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// Watch the Doodle source tree for changes to Go files and rebuild
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// the wasm binary automatically.
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func watchChanges() {
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watcher, err := fsnotify.NewWatcher()
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if err != nil {
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log.Printf("error: %s", err)
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return
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}
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defer watcher.Close()
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done := make(chan bool)
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go func() {
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log.Println("Starting watch files loop")
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for {
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select {
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case event, ok := <-watcher.Events:
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if !ok {
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return
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}
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log.Printf("event: %s", event)
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if event.Op&fsnotify.Write == fsnotify.Write {
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log.Printf("modified file: %s", event.Name)
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onChange()
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}
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case err, ok := <-watcher.Errors:
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if !ok {
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return
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}
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log.Printf("error: %s", err)
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}
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}
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}()
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log.Println("Adding source directory to watcher")
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dirs := crawlDirectory("../")
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// Watch all these folders.
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for _, dir := range dirs {
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err = watcher.Add(dir)
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if err != nil {
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log.Printf("error: %s", err)
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}
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}
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<-done
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}
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// Crawl the filesystem and return paths with Go files.
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func crawlDirectory(root string) []string {
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var (
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ext = ".go"
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result []string
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has bool
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)
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files, err := ioutil.ReadDir(root)
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if err != nil {
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log.Fatalln(err)
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}
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for _, file := range files {
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if file.Name() == ".git" {
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continue
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}
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// Recursively scan subdirectories.
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if file.IsDir() {
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result = append(result,
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crawlDirectory(filepath.Join(root, file.Name()))...,
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)
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continue
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}
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// This root has a file we want?
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if filepath.Ext(file.Name()) == ext {
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has = true
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}
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}
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if has {
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result = append(result, root)
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}
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return result
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}
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