Add initialIndex to processors to specify initial extension

Author: lambdalisue

denops/fall/processor/match.ts

@@ -14,6 +14,7 @@ const CHUNK_SIZE = 1000;
 const CHUNK_INTERVAL = 100;
 
 export type MatchProcessorOptions = {
+  initialIndex?: number;
   interval?: number;
   threshold?: number;
   chunkSize?: number;
@@ -37,7 +38,9 @@ export class MatchProcessor<T extends Detail> implements Disposable {
     matchers: readonly [Matcher<T>, ...Matcher<T>[]],
     options: MatchProcessorOptions = {},
   ) {
-    this.matchers = new ItemBelt(matchers);
+    this.matchers = new ItemBelt(matchers, {
+      index: options.initialIndex,
+    });
     this.#interval = options.interval ?? INTERVAL;
     this.#threshold = options.threshold ?? THRESHOLD;
     this.#chunkSize = options.chunkSize ?? CHUNK_SIZE;

denops/fall/processor/preview.ts

@@ -8,15 +8,24 @@ import type {
 import { ItemBelt } from "../lib/item_belt.ts";
 import { dispatch } from "../event.ts";
 
+export type PreviewProcessorOptions = {
+  initialIndex?: number;
+};
+
 export class PreviewProcessor<T extends Detail> implements Disposable {
   readonly #controller: AbortController = new AbortController();
   readonly previewers: ItemBelt<Previewer<T>>;
   #processing?: Promise<void>;
   #reserved?: () => void;
   #item: PreviewItem | undefined = undefined;
 
-  constructor(previewers: readonly Previewer<T>[]) {
-    this.previewers = new ItemBelt(previewers);
+  constructor(
+    previewers: readonly Previewer<T>[],
+    options: PreviewProcessorOptions = {},
+  ) {
+    this.previewers = new ItemBelt(previewers, {
+      index: options.initialIndex,
+    });
   }
 
   get #previewer(): Previewer<T> | undefined {

denops/fall/processor/render.ts

@@ -14,6 +14,7 @@ const HEIGHT = 10;
 const SCROLL_OFFSET = 2;
 
 export type RenderProcessorOptions = {
+  initialIndex?: number;
   height?: number;
   scrollOffset?: number;
 };
@@ -34,7 +35,9 @@ export class RenderProcessor<T extends Detail> implements Disposable {
     renderers: readonly Renderer<T>[],
     options: RenderProcessorOptions = {},
   ) {
-    this.renderers = new ItemBelt(renderers);
+    this.renderers = new ItemBelt(renderers, {
+      index: options.initialIndex,
+    });
     this.#height = options.height ?? HEIGHT;
     this.#scrollOffset = options.scrollOffset ?? SCROLL_OFFSET;
   }

denops/fall/processor/sort.ts

@@ -5,15 +5,23 @@ import type { Sorter } from "jsr:@vim-fall/core@^0.3.0/sorter";
 import { ItemBelt } from "../lib/item_belt.ts";
 import { dispatch } from "../event.ts";
 
+export type SortProcessorOptions = {
+  initialIndex?: number;
+};
+
 export class SortProcessor<T extends Detail> implements Disposable {
   readonly #controller: AbortController = new AbortController();
   readonly sorters: ItemBelt<Sorter<T>>;
   #processing?: Promise<void>;
   #reserved?: () => void;
   #items: IdItem<T>[] = [];
-
-  constructor(sorters: readonly Sorter<T>[]) {
-    this.sorters = new ItemBelt(sorters);
+  constructor(
+    sorters: readonly Sorter<T>[],
+    options: SortProcessorOptions = {},
+  ) {
+    this.sorters = new ItemBelt(sorters, {
+      index: options.initialIndex,
+    });
   }
 
   get #sorter(): Sorter<T> | undefined {