hugolib, commands: Improve live-reload on directory structure changes

This issue is more visible now that we support nested sections.

This commit makes operations like pasting new content folders or deleting content folders during server watch just work.

Fixes #3570

commands/hugo.go

@@ -829,6 +829,11 @@ func (c *commandeer) newWatcher(port int) error {
 							if err := watcher.Add(path); err != nil {
 								return err
 							}
+						} else if !c.isStatic(path) {
+							// Hugo's rebuilding logic is entirely file based. When you drop a new folder into
+							// /content on OSX, the above logic will handle future watching of those files,
+							// but the initial CREATE is lost.
+							dynamicEvents = append(dynamicEvents, fsnotify.Event{Name: path, Op: fsnotify.Create})
 						}
 						return nil
 					}
@@ -841,9 +846,7 @@ func (c *commandeer) newWatcher(port int) error {
 						}
 					}
 
-					isstatic := strings.HasPrefix(ev.Name, c.PathSpec().GetStaticDirPath()) || (len(c.PathSpec().GetThemesDirPath()) > 0 && strings.HasPrefix(ev.Name, c.PathSpec().GetThemesDirPath()))
-
-					if isstatic {
+					if c.isStatic(ev.Name) {
 						staticEvents = append(staticEvents, ev)
 					} else {
 						dynamicEvents = append(dynamicEvents, ev)
@@ -999,6 +1002,10 @@ func (c *commandeer) newWatcher(port int) error {
 	return nil
 }
 
+func (c *commandeer) isStatic(path string) bool {
+	return strings.HasPrefix(path, c.PathSpec().GetStaticDirPath()) || (len(c.PathSpec().GetThemesDirPath()) > 0 && strings.HasPrefix(path, c.PathSpec().GetThemesDirPath()))
+}
+
 // isThemeVsHugoVersionMismatch returns whether the current Hugo version is
 // less than the theme's min_version.
 func (c *commandeer) isThemeVsHugoVersionMismatch() (mismatch bool, requiredMinVersion string) {

hugolib/page.go

@@ -322,6 +322,18 @@ func (ps Pages) FindPagePosByFilePath(inPath string) int {
 	return -1
 }
 
+func (ps Pages) FindPagePosByFilePathPrefix(prefix string) int {
+	if prefix == "" {
+		return -1
+	}
+	for i, x := range ps {
+		if strings.HasPrefix(x.Source.Path(), prefix) {
+			return i
+		}
+	}
+	return -1
+}
+
 // FindPagePos Given a page, it will find the position in Pages
 // will return -1 if not found
 func (ps Pages) FindPagePos(page *Page) int {

hugolib/page_collections.go

@@ -137,6 +137,18 @@ func (c *PageCollections) addPage(page *Page) {
 	c.rawAllPages = append(c.rawAllPages, page)
 }
 
+// When we get a REMOVE event we're not always getting all the individual files,
+// so we need to remove all below a given path.
+func (c *PageCollections) removePageByPathPrefix(path string) {
+	for {
+		i := c.rawAllPages.FindPagePosByFilePathPrefix(path)
+		if i == -1 {
+			break
+		}
+		c.rawAllPages = append(c.rawAllPages[:i], c.rawAllPages[i+1:]...)
+	}
+}
+
 func (c *PageCollections) removePageByPath(path string) {
 	if i := c.rawAllPages.FindPagePosByFilePath(path); i >= 0 {
 		c.rawAllPages = append(c.rawAllPages[:i], c.rawAllPages[i+1:]...)

hugolib/site.go

@@ -667,11 +667,11 @@ func (s *Site) reProcess(events []fsnotify.Event) (whatChanged, error) {
 		seen[ev] = true
 
 		if s.isContentDirEvent(ev) {
-			logger.Println("Source changed", ev.Name)
+			logger.Println("Source changed", ev)
 			sourceChanged = append(sourceChanged, ev)
 		}
 		if s.isLayoutDirEvent(ev) {
-			logger.Println("Template changed", ev.Name)
+			logger.Println("Template changed", ev)
 			tmplChanged = append(tmplChanged, ev)
 
 			if strings.Contains(ev.Name, "shortcodes") {
@@ -682,11 +682,11 @@ func (s *Site) reProcess(events []fsnotify.Event) (whatChanged, error) {
 			}
 		}
 		if s.isDataDirEvent(ev) {
-			logger.Println("Data changed", ev.Name)
+			logger.Println("Data changed", ev)
 			dataChanged = append(dataChanged, ev)
 		}
 		if s.isI18nEvent(ev) {
-			logger.Println("i18n changed", ev.Name)
+			logger.Println("i18n changed", ev)
 			i18nChanged = append(dataChanged, ev)
 		}
 	}
@@ -761,7 +761,7 @@ func (s *Site) reProcess(events []fsnotify.Event) (whatChanged, error) {
 		if ev.Op&fsnotify.Remove == fsnotify.Remove {
 			//remove the file & a create will follow
 			path, _ := helpers.GetRelativePath(ev.Name, s.getContentDir(ev.Name))
-			s.removePageByPath(path)
+			s.removePageByPathPrefix(path)
 			continue
 		}