feat: support binary file diff (fixes #17)

Author: yeonjuan

Diff for: src/__fixtures__/changed-binary-file

@@ -0,0 +1,3 @@
+diff --git a/file1 b/file1
+index 21be030..9443748 100644
+Binary files a/file1 and b/file1 differ

Diff for: src/__fixtures__/deleted-binary-file

@@ -0,0 +1,4 @@
+diff --git a/file1 b/file1
+deleted file mode 100644
+index 21be030..0000000
+Binary files a/file1 and /dev/null differ

Diff for: src/__fixtures__/new-binary-file

@@ -0,0 +1,4 @@
+diff --git a/file1 b/file1
+new file mode 100644
+index 0000000..21be030
+Binary files /dev/null and b/file1 differ

Diff for: src/__tests__/__snapshots__/changed-binary-file.test.ts.snap

@@ -0,0 +1,20 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`changed binary file parse \`changed-binary-file\` 1`] = `
+{
+  "files": [
+    {
+      "chunks": [
+        {
+          "pathAfter": "file1",
+          "pathBefore": "file1",
+          "type": "BinaryFilesChunk",
+        },
+      ],
+      "path": "file1",
+      "type": "ChangedFile",
+    },
+  ],
+  "type": "GitDiff",
+}
+`;

Diff for: src/__tests__/__snapshots__/deleted-binary-file.test.ts.snap

@@ -0,0 +1,20 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`deleted binary file parse \`deleted-binary-file\` 1`] = `
+{
+  "files": [
+    {
+      "chunks": [
+        {
+          "pathAfter": "/dev/null",
+          "pathBefore": "file1",
+          "type": "BinaryFilesChunk",
+        },
+      ],
+      "path": "file1",
+      "type": "DeletedFile",
+    },
+  ],
+  "type": "GitDiff",
+}
+`;

Diff for: src/__tests__/__snapshots__/new-binary-file.test.ts.snap

@@ -0,0 +1,20 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`new-binary-file parse \`new-binary-file\` 1`] = `
+{
+  "files": [
+    {
+      "chunks": [
+        {
+          "pathAfter": "file1",
+          "pathBefore": "/dev/null",
+          "type": "BinaryFilesChunk",
+        },
+      ],
+      "path": "file1",
+      "type": "AddedFile",
+    },
+  ],
+  "type": "GitDiff",
+}
+`;

Diff for: src/__tests__/changed-binary-file.test.ts

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

Diff for: src/__tests__/deleted-binary-file.test.ts

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

Diff for: src/__tests__/new-binary-file.test.ts

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

Diff for: src/parse-git-diff.ts

@@ -74,12 +74,28 @@ function parseFileChange(ctx: Context): AnyFileChange | undefined {
       chunks,
       path: changeMarkers.deleted,
     };
+  } else if (
+    isDeleted &&
+    chunks.length &&
+    chunks[0].type === 'BinaryFilesChunk'
+  ) {
+    return {
+      type: FileType.Deleted,
+      chunks,
+      path: chunks[0].pathBefore,
+    };
   } else if (isNew && changeMarkers) {
     return {
       type: FileType.Added,
       chunks,
       path: changeMarkers.added,
     };
+  } else if (isNew && chunks.length && chunks[0].type === 'BinaryFilesChunk') {
+    return {
+      type: FileType.Added,
+      chunks,
+      path: chunks[0].pathAfter,
+    };
   } else if (isRename) {
     return {
       type: FileType.Renamed,
@@ -93,7 +109,18 @@ function parseFileChange(ctx: Context): AnyFileChange | undefined {
       chunks,
       path: changeMarkers.added,
     };
+  } else if (
+    chunks.length &&
+    chunks[0].type === 'BinaryFilesChunk' &&
+    chunks[0].pathAfter === chunks[0].pathBefore
+  ) {
+    return {
+      type: FileType.Changed,
+      chunks,
+      path: chunks[0].pathAfter,
+    };
   }
+
   return;
 }
 
@@ -148,6 +175,16 @@ function parseChunk(context: Context): AnyChunk | undefined {
       type: 'CombinedChunk',
       changes,
     };
+  } else if (
+    chunkHeader.type === 'BinaryFilesDiffer' &&
+    chunkHeader.fileA &&
+    chunkHeader.fileB
+  ) {
+    return {
+      type: 'BinaryFilesChunk',
+      pathBefore: chunkHeader.fileA,
+      pathAfter: chunkHeader.fileB,
+    };
   }
 }
 
@@ -184,6 +221,19 @@ function parseChunkHeader(ctx: Context) {
       );
 
     if (!combinedChunkExec) {
+      const binaryChunkExec = /^Binary\sfiles\s(.*)\sand\s(.*)\sdiffer$/.exec(
+        line
+      );
+      if (binaryChunkExec) {
+        const [all, fileA, fileB] = binaryChunkExec;
+        ctx.nextLine();
+        return {
+          type: 'BinaryFilesDiffer',
+          fileA: fileA.replace('a/', ''),
+          fileB: fileB.replace('b/', ''),
+        } as const;
+      }
+
       return null;
     }
 
@@ -206,6 +256,7 @@ function parseChunkHeader(ctx: Context) {
       toFileRange: getRange(addStart, addLines),
     } as const;
   }
+
   const [all, delStart, delLines, addStart, addLines, context] =
     normalChunkExec;
   ctx.nextLine();

Diff for: src/types.ts

@@ -51,7 +51,12 @@ export interface CombinedChunk extends Base<'CombinedChunk'> {
   context: string | undefined;
 }
 
-export type AnyChunk = Chunk | CombinedChunk;
+export interface BinaryFilesChunk extends Base<'BinaryFilesChunk'> {
+  pathBefore: string;
+  pathAfter: string;
+}
+
+export type AnyChunk = Chunk | CombinedChunk | BinaryFilesChunk;
 
 export interface ChangedFile extends Base<typeof FileType.Changed> {
   path: string;