WIP examples + change `.prepare()` to `await .ready`

1 files changed, 13 insertions, 15 deletions

diff --git a/db/db.ts b/db/db.ts
index d5a2b76..5605f40 100644
--- a/db/db.ts
+++ b/db/db.ts
@@ -3,7 +3,6 @@ import * as path from 'https://deno.land/std@0.102.0/path/mod.ts';
 
 import { TokenTags } from "../language/tags.ts";
 import "../util/string.ts";
-import YomikunError from "../util/error.ts";
 
 export interface DBDictInfo {
 	id: number;
@@ -49,14 +48,15 @@ interface DBFindResult {
  */
 export default class DB {
 	private connection: Database;
-	public ready: boolean = false;
+	public ready: Promise<void>;
+  private here = path.dirname(path.fromFileUrl(import.meta.url));
 	private paths = {
 		db: {
-			dict: path.resolve('db', 'dict.db'),
-			user: path.resolve('db', 'user.db'),
+			dict: path.resolve(this.here, 'dict.db'),
+			user: path.resolve(this.here, 'user.db'),
 		},
 		query: {
-			find: path.resolve('db', 'find.sql'),
+			find: path.resolve(this.here, 'find.sql'),
 		},
 	} as const;
 	private statement: {
@@ -68,25 +68,23 @@ export default class DB {
 		this.connection = new Database(":memory:", { create: false });
 		this.statement = {
 			attach: this.connection.prepare("attach database ? as ?"),
-			queryTerm: this.connection.prepare(""), // initialized in prepare()
+			queryTerm: this.connection.prepare(""),
 		};
 		this.attach(this.paths.db.dict, 'dict');
 		this.attach(this.paths.db.user, 'user');
+		this.ready = new Promise<void>(async resolve => {
+			const statement = await Deno.readTextFile(this.paths.query.find);
+			this.statement.queryTerm = this.connection.prepare(statement);
+			resolve();
+		});
 	}
 	
 	private attach(dbPath: string, alias?: string) {
 		this.statement.attach.run(dbPath, alias);
 	}
 
-	async prepare() {
-		const statement = await Deno.readTextFile(this.paths.query.find);
-		this.statement.queryTerm = this.connection.prepare(statement);
-		this.ready = true;
-	}
-
-	findTerm(term: string): FindResult[] {
-		if (!this.ready) throw new YomikunError("DB not ready yet, call `async DB::prepare()` first");
-
+	async findTerm(term: string): Promise<FindResult[]> {
+		await this.ready;
 		var results = this.statement.queryTerm.all({ term }) as unknown as DBFindResult[];
 		var terms: FindResult[] = results?.map(term => {
 			if (term.rules == null) term.rules = "";