Transform trailing whitespace to recommended way (#418)

Co-authored-by: Shinigami92 <[email protected]>

Author: jwerre

src/printer.ts

@@ -1479,6 +1479,8 @@ export class PugPrinter {
     let val: string = token.val;
     let needsTrailingWhitespace: boolean = false;
 
+    const endsWithWhitespace: boolean = val[val.length - 1] === ' ';
+
     if (this.pipelessText) {
       switch (this.previousToken?.type) {
         case 'newline':
@@ -1499,7 +1501,7 @@ export class PugPrinter {
         );
       }
     } else {
-      if (this.nextToken && val[val.length - 1] === ' ') {
+      if (this.nextToken && endsWithWhitespace) {
         switch (this.nextToken.type) {
           case 'interpolated-code':
           case 'start-pug-interpolation':
@@ -1568,6 +1570,10 @@ export class PugPrinter {
       result += ' ';
     }
 
+    if (endsWithWhitespace && this.nextToken?.type === 'indent') {
+      result += '\n' + this.indentString.repeat(this.indentLevel + 1) + '|';
+    }
+
     return result;
   }
 

tests/issues/issue-417/formatted.pug

@@ -0,0 +1,13 @@
+p Aliquam pulvinar enim eu enim finibus euismod.
+  |
+  a(href="https://example.com") Link
+  |
+  | Suspendisse suscipit nunc non mauris sodales elementum.
+
+div
+  p Aliquam pulvinar enim eu enim finibus euismod.
+  p Aliquam pulvinar enim eu enim finibus euismod.
+    |
+    a(href="https://example.com") Link
+    |
+    | Suspendisse suscipit nunc non mauris sodales elementum.

tests/issues/issue-417/issue-417.test.ts

@@ -0,0 +1,9 @@
+import { compareFiles } from 'tests/common';
+import { describe, expect, it } from 'vitest';
+
+describe('Issues', () => {
+  it('should add two empty piped lines before and after link tag', () => {
+    const { expected, actual } = compareFiles(__dirname);
+    expect(actual).toBe(expected);
+  });
+});

tests/issues/issue-417/unformatted.pug

@@ -0,0 +1,9 @@
+p Aliquam pulvinar enim eu enim finibus euismod. 
+  a(href="https://example.com") Link
+  |  Suspendisse suscipit nunc non mauris sodales elementum.
+
+div
+  p Aliquam pulvinar enim eu enim finibus euismod. 
+  p Aliquam pulvinar enim eu enim finibus euismod. 
+    a(href="https://example.com") Link
+    |  Suspendisse suscipit nunc non mauris sodales elementum.