removed cursor in favor of context and channels

traversers.go

@@ -0,0 +1,62 @@
+package nuapi
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"slices"
+)
+
+type ChapterEntryTraverser func(ctx context.Context, api *Api, novelID NovelID, pageCount int, out chan<- NovelChapterEntry)
+
+// TraverseAscending returns a ChapterEntryTraverser which traverses entries from oldest to newest chapter
+func TraverseAscending() ChapterEntryTraverser {
+	return func(ctx context.Context, api *Api, novelID NovelID, pageCount int, out chan<- NovelChapterEntry) {
+		defer close(out)
+
+		for pageIndex := pageCount; pageIndex > 0; pageIndex-- {
+			if ctx.Err() != nil {
+				break
+			}
+
+			entries, err := api.getChapterEntriesByPageIndex(novelID, pageIndex)
+			if err != nil {
+				if Verbose {
+					fmt.Fprintln(os.Stderr, err)
+				}
+				return
+			}
+
+			slices.Reverse(entries)
+
+			for _, entry := range entries {
+				out <- entry
+			}
+		}
+	}
+}
+
+// TraverseDescending returns a ChapterEntryTraverser which traverses entries from newest to oldest chapter
+func TraverseDescending() ChapterEntryTraverser {
+	return func(ctx context.Context, api *Api, novelID NovelID, pageCount int, out chan<- NovelChapterEntry) {
+		defer close(out)
+
+		for pageIndex := 1; pageIndex <= pageCount; pageIndex++ {
+			if ctx.Err() != nil {
+				break
+			}
+
+			entries, err := api.getChapterEntriesByPageIndex(novelID, pageIndex)
+			if err != nil {
+				if Verbose {
+					fmt.Fprintln(os.Stderr, err)
+				}
+				return
+			}
+
+			for _, entry := range entries {
+				out <- entry
+			}
+		}
+	}
+}