feat: Add 'has id' query

Author: claremacrae

src/Query/Filter/IdField.ts

@@ -11,6 +11,14 @@ export class IdField extends Field {
         this.filterInstructions.add('has id', (task: Task) => task.id.length > 0);
     }
 
+    public canCreateFilterForLine(line: string): boolean {
+        if (this.filterInstructions.canCreateFilterForLine(line)) {
+            return true;
+        }
+
+        return super.canCreateFilterForLine(line);
+    }
+
     public createFilterOrErrorMessage(line: string): FilterOrErrorMessage {
         const filterResult = this.filterInstructions.createFilterOrErrorMessage(line);
         if (filterResult.filter !== undefined) {

src/Query/FilterParser.ts

@@ -29,6 +29,7 @@ import { RootField } from './Filter/RootField';
 import { BacklinkField } from './Filter/BacklinkField';
 import { CancelledDateField } from './Filter/CancelledDateField';
 import { BlockingField } from './Filter/BlockingField';
+import { IdField } from './Filter/IdField';
 
 // When parsing a query the fields are tested one by one according to this order.
 // Since BooleanField is a meta-field, which needs to aggregate a few fields together, it is intended to
@@ -61,6 +62,7 @@ export const fieldCreators: EndsWith<BooleanField> = [
     () => new UrgencyField(),
     () => new RecurrenceField(),
     () => new FunctionField(),
+    () => new IdField(),
     () => new BlockingField(),
     () => new BooleanField(), // --- Please make sure to keep BooleanField last (see comment above) ---
 ];

tests/Query/Filter/IdField.test.ts

@@ -11,7 +11,9 @@ describe('id', () => {
 
     it('by id presence', () => {
         // Arrange
-        const filter = new IdField().createFilterOrErrorMessage('has id');
+        const line = 'has id';
+        const filter = new IdField().createFilterOrErrorMessage(line);
+        expect(idField.canCreateFilterForLine(line)).toEqual(true);
 
         // Act, Assert
         testFilter(filter, new TaskBuilder().id(''), false);

tests/Query/Query.test.ts

@@ -87,6 +87,7 @@ describe('Query parsing', () => {
         'has done date',
         'has due date',
         'has happens date',
+        'has id',
         'has scheduled date',
         'has start date',
         'has tag',