76 lines
1.5 KiB
Go
76 lines
1.5 KiB
Go
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package main
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import (
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"log"
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"path/filepath"
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"strings"
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"time"
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"github.com/fsnotify/fsnotify"
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)
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type Watcher struct {
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w *fsnotify.Watcher
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g *Generator
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done chan struct{}
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}
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func NewWatcher(dir string, g *Generator) (*Watcher, error) {
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w, err := fsnotify.NewWatcher()
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if err != nil {
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return nil, err
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}
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if err := w.Add(dir); err != nil {
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w.Close()
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return nil, err
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}
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return &Watcher{w: w, g: g, done: make(chan struct{})}, nil
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}
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// Watch blocks, watching for changes and triggering rebuilds.
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// Rapid events (e.g. scp writing an image then its sidecar) are debounced
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// with a 500 ms window so only one rebuild fires per logical upload.
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func (w *Watcher) Watch() {
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var timer *time.Timer
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rebuild := func() {
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if err := w.g.Build(); err != nil {
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log.Printf("rebuild: %v", err)
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}
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}
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for {
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select {
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case event, ok := <-w.w.Events:
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if !ok {
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return
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}
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if !isRelevant(event.Name) {
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continue
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}
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if event.Has(fsnotify.Create) || event.Has(fsnotify.Write) || event.Has(fsnotify.Remove) {
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if timer != nil {
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timer.Stop()
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}
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timer = time.AfterFunc(500*time.Millisecond, rebuild)
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}
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case err, ok := <-w.w.Errors:
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if !ok {
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return
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}
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log.Printf("watcher: %v", err)
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case <-w.done:
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return
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}
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}
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}
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func (w *Watcher) Close() {
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close(w.done)
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w.w.Close()
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}
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func isRelevant(name string) bool {
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ext := strings.ToLower(filepath.Ext(name))
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return ext == ".jpg" || ext == ".jpeg" || ext == ".png" || ext == ".toml"
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}
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