Handle Windows line endings (#62)

src/core/diff/strategies/__tests__/search-replace.test.ts

@@ -181,6 +181,23 @@ function test() {
             expect(result).toBe("\tfunction test() {\n\t\t// First comment\n\t\t// Second comment\n\t\treturn true;\n\t}")
         })
 
+        it('should handle Windows-style CRLF line endings', () => {
+            const originalContent = "function test() {\r\n    return true;\r\n}\r\n"
+            const diffContent = `test.ts
+<<<<<<< SEARCH
+function test() {
+    return true;
+}
+=======
+function test() {
+    return false;
+}
+>>>>>>> REPLACE`
+
+            const result = strategy.applyDiff(originalContent, diffContent)
+            expect(result).toBe("function test() {\r\n    return false;\r\n}\r\n")
+        })
+
         it('should return false if search content does not match', () => {
             const originalContent = `function hello() {
     console.log("hello")

src/core/diff/strategies/search-replace.ts

@@ -70,10 +70,13 @@ Your search/replace content here
 
         const [_, searchContent, replaceContent] = match;
         
-        // Split content into lines
-        const searchLines = searchContent.trim().split('\n');
-        const replaceLines = replaceContent.trim().split('\n');
-        const originalLines = originalContent.split('\n');
+        // Detect line ending from original content
+        const lineEnding = originalContent.includes('\r\n') ? '\r\n' : '\n';
+        
+        // Split content into lines, handling both \n and \r\n
+        const searchLines = searchContent.trim().split(/\r?\n/);
+        const replaceLines = replaceContent.trim().split(/\r?\n/);
+        const originalLines = originalContent.split(/\r?\n/);
         
         // Find the search content in the original
         let matchIndex = -1;
@@ -166,6 +169,6 @@ Your search/replace content here
         const beforeMatch = originalLines.slice(0, matchIndex);
         const afterMatch = originalLines.slice(matchIndex + searchLines.length);
         
-        return [...beforeMatch, ...indentedReplace, ...afterMatch].join('\n');
+        return [...beforeMatch, ...indentedReplace, ...afterMatch].join(lineEnding);
     }
-}
+}