Refactored relevant methods to SearchHistory

src/search/search-history.ts

@@ -0,0 +1,38 @@
+import type OmnisearchPlugin from '../main'
+
+export class SearchHistory {
+  /**
+   * Show an empty input field next time the user opens Omnisearch modal
+   */
+  private nextQueryIsEmpty = false
+
+  constructor(private plugin: OmnisearchPlugin) {}
+
+  public async addToHistory(query: string): Promise<void> {
+    if (!query) {
+      this.nextQueryIsEmpty = true
+      return
+    }
+    this.nextQueryIsEmpty = false
+    const database = this.plugin.database
+    let history = await database.searchHistory.toArray()
+    history = history.filter(s => s.query !== query).reverse()
+    history.unshift({ query })
+    history = history.slice(0, 10)
+    await database.searchHistory.clear()
+    await database.searchHistory.bulkAdd(history)
+  }
+
+  /**
+   * @returns The search history, in reverse chronological order
+   */
+  public async getHistory(): Promise<ReadonlyArray<string>> {
+    const data = (await this.plugin.database.searchHistory.toArray())
+      .reverse()
+      .map(o => o.query)
+    if (this.nextQueryIsEmpty) {
+      data.unshift('')
+    }
+    return data
+  }
+}