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watch.go
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/
watch.go
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package main
import (
"log"
"net/http"
"os"
"path/filepath"
"github.com/fsnotify/fsnotify"
)
// watch a folder for changes and rebuild the documentation
// when a change is detected.
func watch(docsFolder, dstFolder string) {
log.Println("> 👀 Watching for changes in", docsFolder)
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
defer watcher.Close()
// Start listening for events.
go func() {
for {
select {
case event, ok := <-watcher.Events:
if !ok {
return
}
build(docsFolder, dstFolder)
log.Println(">", event.Name, "changed, documentation rebuilt.")
case err, ok := <-watcher.Errors:
if !ok {
return
}
log.Println("error:", err)
}
}
}()
// add the folder and its subfolders to the watcher by
// walking the folder.
err = filepath.Walk(docsFolder, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
err = watcher.Add(path)
if err != nil {
return err
}
return nil
})
if err != nil {
log.Fatal(err)
}
// Block main goroutine forever.
<-make(chan struct{})
}
// Serve the public folder
func serve(dstFolder string) error {
fs := http.FileServer(http.Dir(dstFolder))
http.Handle("/", fs)
log.Println("> Serving documentation on http://localhost:3000/")
err := http.ListenAndServe(":3000", nil)
if err != nil {
return err
}
return nil
}