feat: Add unique filter to nunjucks.

.changeset/great-elephants-flash.md

@@ -0,0 +1,5 @@
+---
+'@lowdefy/nunjucks': minor
+---
+
+Add 'unique' filter to \_nunjucks.

packages/utils/nunjucks/src/index.js

@@ -17,11 +17,13 @@
 import nunjucks from 'nunjucks';
 import { type } from '@lowdefy/helpers';
 import dateFilter from './dateFilter.js';
+import uniqueFilter from './uniqueFilter.js';
 
 // dateFilter.setDefaultFormat('YYYY-MM-DD');
 export const nunjucksEnv = new nunjucks.Environment();
 
 nunjucksEnv.addFilter('date', dateFilter);
+nunjucksEnv.addFilter('unique', uniqueFilter);
 
 const nunjucksTemplates = {};
 // slow

packages/utils/nunjucks/src/uniqueFilter.js

@@ -0,0 +1,26 @@
+/*
+  Copyright 2020-2024 Lowdefy, Inc
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+import { type } from '@lowdefy/helpers';
+
+const uniqueFilter = (arr) => {
+  if (!type.isArray(arr)) {
+    return arr;
+  }
+  return Array.from(new Set(arr));
+};
+
+export default uniqueFilter;

packages/utils/nunjucks/src/uniqueFilter.test.js

@@ -0,0 +1,68 @@
+/*
+  Copyright 2020-2024 Lowdefy, Inc
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+import nunjucks from 'nunjucks';
+import uniqueFilter from './uniqueFilter.js';
+
+export const nunjucksEnv = new nunjucks.Environment();
+nunjucksEnv.addFilter('unique', uniqueFilter);
+
+describe('uniqueFilter', () => {
+  test('should return unique values from an array of primitives', () => {
+    const input = [1, 2, 2, 3, 4, 4, 4, 5];
+    const output = uniqueFilter(input);
+    expect(output).toEqual([1, 2, 3, 4, 5]);
+  });
+
+  test('should return unique values from an array of strings', () => {
+    const input = ['a', 'b', 'b', 'c', 'a'];
+    const output = uniqueFilter(input);
+    expect(output).toEqual(['a', 'b', 'c']);
+  });
+
+  test('should return the same array when all values are unique', () => {
+    const input = [1, 2, 3, 4, 5];
+    const output = uniqueFilter(input);
+    expect(output).toEqual([1, 2, 3, 4, 5]);
+  });
+
+  test('should return an empty array when input is an empty array', () => {
+    const input = [];
+    const output = uniqueFilter(input);
+    expect(output).toEqual([]);
+  });
+
+  test('should return the input when input is not an array', () => {
+    expect(uniqueFilter(123)).toBe(123);
+    expect(uniqueFilter('abc')).toBe('abc');
+    expect(uniqueFilter({ a: 1 })).toEqual({ a: 1 });
+    expect(uniqueFilter(null)).toBe(null);
+    expect(uniqueFilter(undefined)).toBe(undefined);
+  });
+
+  test('should handle an array with mixed types', () => {
+    const input = [1, '1', 1, 'a', 'a', {}, {}, []];
+    const output = uniqueFilter(input);
+    expect(output).toEqual([1, '1', 'a', input[5], input[6], input[7]]);
+  });
+
+  test('should install unique filter in nunjucks and return unique values', () => {
+    const templateString = '{{ value | unique | dump }}';
+    const input = [1, 2, 2, 3, 4, 4, 4, 5];
+    const output = nunjucksEnv.renderString(templateString, { value: input });
+    expect(output).toBe('[1,2,3,4,5]');
+  });
+});