fix: handle consecutive-empty-files

Author: yeonjuan

src/__fixtures__/consecutive-empty-files

@@ -0,0 +1,14 @@
+diff --git a/content b/content
+new file mode 100644
+index 0000000..6b584e8
+--- /dev/null
++++ b/content
+@@ -0,0 +1 @@
++content
+\ No newline at end of file
+diff --git a/empty b/empty
+new file mode 100644
+index 0000000..e69de29
+diff --git a/empty2 b/empty2
+new file mode 100644
+index 0000000..e69de29

src/__tests__/__snapshots__/31.test.ts.snap

@@ -3,6 +3,11 @@
 exports[`issue 31 parse \`31\` 1`] = `
 {
   "files": [
+    {
+      "chunks": [],
+      "path": "var/folders/kt/zd3bfncd0c3gjx25hbcq483c0000gn/T/epicshop/diff/advanced-react-apis/04.01.solution/7h2jowvfi2q/index.test.tsx",
+      "type": "AddedFile",
+    },
     {
       "chunks": [
         {
@@ -406,7 +411,7 @@ exports[`issue 31 parse \`31\` 1`] = `
         },
       ],
       "path": "var/folders/kt/zd3bfncd0c3gjx25hbcq483c0000gn/T/epicshop/diff/advanced-react-apis/04.01.solution/7h2jowvfi2q/index.tsx",
-      "type": "AddedFile",
+      "type": "ChangedFile",
     },
   ],
   "type": "GitDiff",

src/__tests__/__snapshots__/consecutive-empty-files.test.ts.snap

@@ -0,0 +1,48 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`consecutive-empty-files parse \`consecutive-empty-files\` 1`] = `
+{
+  "files": [
+    {
+      "chunks": [
+        {
+          "changes": [
+            {
+              "content": "content",
+              "lineAfter": 1,
+              "type": "AddedLine",
+            },
+            {
+              "content": "No newline at end of file",
+              "type": "MessageLine",
+            },
+          ],
+          "context": undefined,
+          "fromFileRange": {
+            "lines": 0,
+            "start": 0,
+          },
+          "toFileRange": {
+            "lines": 1,
+            "start": 1,
+          },
+          "type": "Chunk",
+        },
+      ],
+      "path": "content",
+      "type": "AddedFile",
+    },
+    {
+      "chunks": [],
+      "path": "empty",
+      "type": "AddedFile",
+    },
+    {
+      "chunks": [],
+      "path": "empty2",
+      "type": "AddedFile",
+    },
+  ],
+  "type": "GitDiff",
+}
+`;

src/__tests__/consecutive-empty-files.test.ts

@@ -0,0 +1,10 @@
+import { getFixture } from './test-utils';
+import parseGitDiff from '../parse-git-diff';
+
+describe('consecutive-empty-files', () => {
+  const fixture = getFixture('consecutive-empty-files');
+
+  it('parse `consecutive-empty-files`', () => {
+    expect(parseGitDiff(fixture)).toMatchSnapshot();
+  });
+});

src/parse-git-diff.ts

@@ -210,7 +210,7 @@ function parseChunk(context: Context): AnyChunk | undefined {
 
 function parseExtendedHeader(ctx: Context) {
   if (isComparisonInputLine(ctx.getCurLine())) {
-    ctx.nextLine();
+    return null;
   }
   const line = ctx.getCurLine();
   const type = ExtendedHeaderValues.find((v) => line.startsWith(v));
@@ -279,7 +279,6 @@ function parseChunkHeader(ctx: Context) {
       toFileRange: getRange(addStart, addLines),
     } as const;
   }
-
   const [all, delStart, delLines, addStart, addLines, context] =
     normalChunkExec;
   ctx.nextLine();