feat: add side-by-side diff layout and whitespace toggle (#208)

2026-04-07 10:22:20 +08:00
parent 03380cfad0
commit fd9dfb0cc8
13 changed files with 925 additions and 163 deletions
@@ -0,0 +1,81 @@
+import { describe, expect, it } from "vitest";
+import { buildSplitDiffRows } from "./diff-layout";
+import type { ParsedDiffFile } from "@/hooks/use-checkout-diff-query";
+
+function makeFile(lines: ParsedDiffFile["hunks"][number]["lines"]): ParsedDiffFile {
+  return {
+    path: "example.ts",
+    isNew: false,
+    isDeleted: false,
+    additions: lines.filter((line) => line.type === "add").length,
+    deletions: lines.filter((line) => line.type === "remove").length,
+    status: "ok",
+    hunks: [
+      {
+        oldStart: 10,
+        oldCount: 4,
+        newStart: 10,
+        newCount: 5,
+        lines,
+      },
+    ],
+  };
+}
+
+describe("buildSplitDiffRows", () => {
+  it("pairs replacement runs by index", () => {
+    const rows = buildSplitDiffRows(
+      makeFile([
+        { type: "header", content: "@@ -10,2 +10,2 @@" },
+        { type: "remove", content: "before one" },
+        { type: "remove", content: "before two" },
+        { type: "add", content: "after one" },
+        { type: "add", content: "after two" },
+      ]),
+    );
+
+    expect(rows).toHaveLength(3);
+    expect(rows[1]).toMatchObject({
+      kind: "pair",
+      left: { type: "remove", content: "before one", lineNumber: 10 },
+      right: { type: "add", content: "after one", lineNumber: 10 },
+    });
+    expect(rows[2]).toMatchObject({
+      kind: "pair",
+      left: { type: "remove", content: "before two", lineNumber: 11 },
+      right: { type: "add", content: "after two", lineNumber: 11 },
+    });
+  });
+
+  it("keeps unmatched additions on the right side only", () => {
+    const rows = buildSplitDiffRows(
+      makeFile([
+        { type: "header", content: "@@ -10,1 +10,2 @@" },
+        { type: "remove", content: "before" },
+        { type: "add", content: "after one" },
+        { type: "add", content: "after two" },
+      ]),
+    );
+
+    expect(rows[2]).toMatchObject({
+      kind: "pair",
+      left: null,
+      right: { type: "add", content: "after two", lineNumber: 11 },
+    });
+  });
+
+  it("duplicates context rows on both sides", () => {
+    const rows = buildSplitDiffRows(
+      makeFile([
+        { type: "header", content: "@@ -10,1 +10,1 @@" },
+        { type: "context", content: "same line" },
+      ]),
+    );
+
+    expect(rows[1]).toMatchObject({
+      kind: "pair",
+      left: { type: "context", content: "same line", lineNumber: 10 },
+      right: { type: "context", content: "same line", lineNumber: 10 },
+    });
+  });
+});