(fix) no empty line at the end of markdown embed

Prettier's markdown parser tries to strip the last hardline of the embedded docs, but fails to do so in our case because it does not recurse into concat parts -> we need to strip it ourselves.
Fixes sveltejs#202

CHANGELOG.md

@@ -1,5 +1,9 @@
 # prettier-plugin-svelte changelog
 
+## 2.1.3 (Unreleased)
+
+* Don't print empty line at the end of the code if embedded inside markdown ([#202](https://github.com/sveltejs/prettier-plugin-svelte/issues/202))
+
 ## 2.1.2
 
 * Keep whitespace around `<script>`/`<style>` tags ([#197](https://github.com/sveltejs/prettier-plugin-svelte/issues/197))

src/print/index.ts

@@ -4,7 +4,7 @@ import { extractAttributes } from '../lib/extractAttributes';
 import { getText } from '../lib/getText';
 import { hasSnippedContent, unsnipContent } from '../lib/snipTagContent';
 import { parseSortOrder, SortOrderPart } from '../options';
-import { isEmptyDoc, isLine, trim } from './doc-helpers';
+import { isEmptyDoc, isLine, trim, trimRight } from './doc-helpers';
 import { flatten, isASTNode, isPreTagContent } from './helpers';
 import {
     checkWhitespaceAtEndOfSvelteBlock,
@@ -673,6 +673,15 @@ function printTopLevelParts(
     ignoreNext = false;
     svelteOptionsDoc = undefined;
 
+    // If this is invoked as an embed of markdown, remove the last hardline.
+    // The markdown parser tries this, too, but fails because it does not
+    // recurse into concats. Doing this will prevent an empty line
+    // at the end of the embedded code block.
+    if (options.parentParser === 'markdown') {
+        const lastDoc = docs[docs.length - 1];
+        trimRight([lastDoc], isLine);
+    }
+
     return groupConcat([join(hardline, docs)]);
 }
 

test/printer/samples/markdown.md

@@ -17,5 +17,4 @@ by offloading the formatting of the fenced code block to prettier-plugin-svelte.
         color: green;
     }
 </style>
-
 ```