add missing eof line support (#11)

* add missing eof line support

* run prettier

* change to message line, update readme

Author: zmully

README.md

@@ -468,6 +468,122 @@ index 0e05564..aa39060 100644
 
 <!-- end:deleted-line-output -->
 
+<!-- start:message-line-input -->
+
+```diff
+diff --git a/rename.md b/rename.md
+index 0e05564..aa39060 100644
+--- a/rename.md
++++ b/rename.md
+@@ -1,2 +1 @@
+ newfile
+-newline
++newline
+\ No newline at end of file
+diff --git a/rename2.md b/rename2.md
+index 0e05564..aa39060 100644
+--- a/rename2.md
++++ b/rename2.md
+@@ -1,2 +1 @@
+ newfile2
+-newline2
++newline2
+\ No newline at end of file
+
+```
+
+<!-- end:message-line-input -->
+
+<!-- start:message-line-output -->
+
+```json
+{
+  "type": "GitDiff",
+  "files": [
+    {
+      "type": "ChangedFile",
+      "chunks": [
+        {
+          "type": "Chunk",
+          "toFileRange": {
+            "start": 1,
+            "lines": 1
+          },
+          "fromFileRange": {
+            "start": 1,
+            "lines": 2
+          },
+          "changes": [
+            {
+              "type": "UnchangedLine",
+              "lineBefore": 1,
+              "lineAfter": 1,
+              "content": "newfile"
+            },
+            {
+              "type": "DeletedLine",
+              "lineBefore": 2,
+              "content": "newline"
+            },
+            {
+              "type": "AddedLine",
+              "lineAfter": 2,
+              "content": "newline"
+            },
+            {
+              "type": "MessageLine",
+              "content": "No newline at end of file"
+            }
+          ]
+        }
+      ],
+      "path": "rename.md"
+    },
+    {
+      "type": "ChangedFile",
+      "chunks": [
+        {
+          "type": "Chunk",
+          "toFileRange": {
+            "start": 1,
+            "lines": 1
+          },
+          "fromFileRange": {
+            "start": 1,
+            "lines": 2
+          },
+          "changes": [
+            {
+              "type": "UnchangedLine",
+              "lineBefore": 1,
+              "lineAfter": 1,
+              "content": "newfile2"
+            },
+            {
+              "type": "DeletedLine",
+              "lineBefore": 2,
+              "content": "newline2"
+            },
+            {
+              "type": "AddedLine",
+              "lineAfter": 2,
+              "content": "newline2"
+            },
+            {
+              "type": "MessageLine",
+              "content": "No newline at end of file"
+            }
+          ]
+        }
+      ],
+      "path": "rename2.md"
+    }
+  ]
+}
+```
+
+<!-- end:message-line-output -->
+
 </details>
 
 ## AST Format

scripts/build-readme.js

@@ -13,6 +13,7 @@ const FIXTURES = [
   'conflict-file',
   'new-line',
   'deleted-line',
+  'message-line',
 ];
 
 let readmeReplacer = replacer().content(README_INPUT);

src/__fixtures__/message-line

@@ -0,0 +1,18 @@
+diff --git a/rename.md b/rename.md
+index 0e05564..aa39060 100644
+--- a/rename.md
++++ b/rename.md
+@@ -1,2 +1 @@
+ newfile
+-newline
++newline
+\ No newline at end of file
+diff --git a/rename2.md b/rename2.md
+index 0e05564..aa39060 100644
+--- a/rename2.md
++++ b/rename2.md
+@@ -1,2 +1 @@
+ newfile2
+-newline2
++newline2
+\ No newline at end of file

src/__tests__/__snapshots__/message-line.test.ts.snap

@@ -0,0 +1,87 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`message-line parse \`message-line\` 1`] = `
+{
+  "files": [
+    {
+      "chunks": [
+        {
+          "changes": [
+            {
+              "content": "newfile",
+              "lineAfter": 1,
+              "lineBefore": 1,
+              "type": "UnchangedLine",
+            },
+            {
+              "content": "newline",
+              "lineBefore": 2,
+              "type": "DeletedLine",
+            },
+            {
+              "content": "newline",
+              "lineAfter": 2,
+              "type": "AddedLine",
+            },
+            {
+              "content": "No newline at end of file",
+              "type": "MessageLine",
+            },
+          ],
+          "fromFileRange": {
+            "lines": 2,
+            "start": 1,
+          },
+          "toFileRange": {
+            "lines": 1,
+            "start": 1,
+          },
+          "type": "Chunk",
+        },
+      ],
+      "path": "rename.md",
+      "type": "ChangedFile",
+    },
+    {
+      "chunks": [
+        {
+          "changes": [
+            {
+              "content": "newfile2",
+              "lineAfter": 1,
+              "lineBefore": 1,
+              "type": "UnchangedLine",
+            },
+            {
+              "content": "newline2",
+              "lineBefore": 2,
+              "type": "DeletedLine",
+            },
+            {
+              "content": "newline2",
+              "lineAfter": 2,
+              "type": "AddedLine",
+            },
+            {
+              "content": "No newline at end of file",
+              "type": "MessageLine",
+            },
+          ],
+          "fromFileRange": {
+            "lines": 2,
+            "start": 1,
+          },
+          "toFileRange": {
+            "lines": 1,
+            "start": 1,
+          },
+          "type": "Chunk",
+        },
+      ],
+      "path": "rename2.md",
+      "type": "ChangedFile",
+    },
+  ],
+  "type": "GitDiff",
+}
+`;

src/__tests__/message-line.test.ts

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

src/constants.ts

@@ -2,6 +2,7 @@ export const LineType = {
   Added: 'AddedLine',
   Deleted: 'DeletedLine',
   Unchanged: 'UnchangedLine',
+  Message: 'MessageLine',
 } as const;
 
 export const FileType = {

src/parse-git-diff.ts

@@ -244,6 +244,7 @@ const CHAR_TYPE_MAP: Record<string, LineType> = {
   '+': LineType.Added,
   '-': LineType.Deleted,
   ' ': LineType.Unchanged,
+  '\\': LineType.Message,
 };
 
 function parseChanges(
@@ -291,6 +292,13 @@ function parseChanges(
         };
         break;
       }
+      case LineType.Message: {
+        change = {
+          type,
+          content: content.trim(),
+        };
+        break;
+      }
     }
     changes.push(change);
   }

src/types.ts

@@ -21,7 +21,15 @@ export interface UnchangedLine extends BaseChange<typeof LineType.Unchanged> {
   lineAfter: number;
 }
 
-export type AnyLineChange = AddedLine | DeletedLine | UnchangedLine;
+export interface MessageLine extends BaseChange<typeof LineType.Message> {
+  content: string;
+}
+
+export type AnyLineChange =
+  | AddedLine
+  | DeletedLine
+  | UnchangedLine
+  | MessageLine;
 
 export interface ChunkRange {
   start: number;