Add support for tags and priorities + make default query and mapper

src/loader/index.ts

@@ -5,6 +5,7 @@ import { parse } from "../generated/grammar/task";
 import { Task as DefaultTask } from "../model";
 import { ParseResult } from "../types/grammar";
 import { Task, TaskPriority } from "../types/task";
+import { jsMapper } from "../util";
 
 /**
  * Returns all tasks from specified directory and filters them with optional query.
@@ -20,21 +21,12 @@ export async function loadTasks(directories: string[], query?: string): Promise<
     HIGHEST: TaskPriority.HIGHEST
   };
 
-  const filter = query && createFilter(query, ctx);
+  const filter = query && jsMapper<Task, boolean>(query, ctx);
   const tasks = await Promise.all(directories.map(readTasksFromDirectory));
   
   return tasks.flat().filter(t => filter ? filter(t) : true);
 }
 
-/**
- * Creates a filter function for tasks using a query string and context object.
- * All context' properties will be passed as variables to the query string.
- */
-function createFilter(query: string, context: Record<string, unknown>): (task: Task) => boolean {
-  const filter = new Function('$', ...Object.keys(context), `return ${query};`);
-  return (task: Task) => filter(task, ...Object.values(context));
-}
-
 /**
  * Read all files in specific directory and returns all tasks from those files.
  */