From 1b5d63fd042e9ee76a2f7435c03452b6b6172544 Mon Sep 17 00:00:00 2001
From: Krisztian Daroczi <daroczi.krisztian@gmail.com>
Date: Sun, 10 May 2026 13:06:59 +0200
Subject: [PATCH] Prevents prefix stripper from eating empty new lines

---
 src/modelFactory/markdownPrefixStripper.ts    |  4 +--
 .../cliPrettyfierSystemTests.test.ts          |  9 ++++++-
 .../blockQuoteNewLineNoTable-expected.md      | 25 +++++++++++++++++++
 .../blockQuoteNewLineNoTable-input.md         | 25 +++++++++++++++++++
 4 files changed, 60 insertions(+), 3 deletions(-)
 create mode 100644 test/systemTests/resources/blockQuoteNewLineNoTable-expected.md
 create mode 100644 test/systemTests/resources/blockQuoteNewLineNoTable-input.md

diff --git a/src/modelFactory/markdownPrefixStripper.ts b/src/modelFactory/markdownPrefixStripper.ts
index 7a2e660..9234cb7 100644
--- a/src/modelFactory/markdownPrefixStripper.ts
+++ b/src/modelFactory/markdownPrefixStripper.ts
@@ -31,14 +31,14 @@ export class MarkdownPrefixStripper {
         let remaining = line;
 
         // Layer 1: Blockquote markers (always strip - unambiguous Markdown syntax)
-        const bqMatch = remaining.match(/^(\s*(?:>\s*)+)/);
+        const bqMatch = remaining.match(/^([^\S\r\n]*(?:>[^\S\r\n]*)+)/);
         if (bqMatch) {
             prefix += bqMatch[1];
             remaining = remaining.substring(bqMatch[1].length);
         }
 
         // Layer 2: List markers (only strip when followed by whitespace + |, i.e., bordered tables)
-        const listMatch = remaining.match(/^(\s*(?:\d+[.)]|[-*+]))(?=\s+\|)/);
+        const listMatch = remaining.match(/^([^\S\r\n]*(?:\d+[.)]|[-*+]))(?=[^\S\r\n]+\|)/);
         if (listMatch) {
             prefix += listMatch[1];
         }
diff --git a/test/systemTests/cliPrettyfierSystemTests.test.ts b/test/systemTests/cliPrettyfierSystemTests.test.ts
index 16f0942..f6b2ac6 100644
--- a/test/systemTests/cliPrettyfierSystemTests.test.ts
+++ b/test/systemTests/cliPrettyfierSystemTests.test.ts
@@ -28,7 +28,14 @@ fs.readdir(path.resolve(__dirname, "resources/"), function(err, files) {
         for (let fileNameRoot of distinctTests) {
             test(`[${fileNameRoot}]`, () => {
                 const input = readFileContents(`${fileNameRoot}-input.md`);
-                assert.throws(() => CliPrettify.check(input));
+                const expected = readFileContents(`${fileNameRoot}-expected.md`);
+                const cliOptions = SystemTestsConfig.getCliOptionsFor(fileNameRoot);
+
+                if (input === expected) {
+                    assert.doesNotThrow(() => CliPrettify.check(input, cliOptions));
+                } else {
+                    assert.throws(() => CliPrettify.check(input, cliOptions));
+                }
             });
         }
     });
diff --git a/test/systemTests/resources/blockQuoteNewLineNoTable-expected.md b/test/systemTests/resources/blockQuoteNewLineNoTable-expected.md
new file mode 100644
index 0000000..eb92c7d
--- /dev/null
+++ b/test/systemTests/resources/blockQuoteNewLineNoTable-expected.md
@@ -0,0 +1,25 @@
+> First line of my note.
+>
+> Second line.
+
+> [!NOTE]
+> First line of my note.
+>
+> ```text
+> some_code
+> ```
+
+# Awesome file
+
+> [!NOTE]
+> First line of my note.
+>
+> ```text
+> some_code
+> ```
+
+Here is a paragraph.
+
+> A marvelous quotation.
+
+Second paragraph.
\ No newline at end of file
diff --git a/test/systemTests/resources/blockQuoteNewLineNoTable-input.md b/test/systemTests/resources/blockQuoteNewLineNoTable-input.md
new file mode 100644
index 0000000..eb92c7d
--- /dev/null
+++ b/test/systemTests/resources/blockQuoteNewLineNoTable-input.md
@@ -0,0 +1,25 @@
+> First line of my note.
+>
+> Second line.
+
+> [!NOTE]
+> First line of my note.
+>
+> ```text
+> some_code
+> ```
+
+# Awesome file
+
+> [!NOTE]
+> First line of my note.
+>
+> ```text
+> some_code
+> ```
+
+Here is a paragraph.
+
+> A marvelous quotation.
+
+Second paragraph.
\ No newline at end of file