Function buildFileContents

packages/cli/src/routes/diff.ts:207–234

(
	run: ChapterRunRow,
	repoRoot: string,
	patch: string,
)

			} else {
				const firstLine = text.slice(0, text.indexOf("\n") === -1 ? undefined : text.indexOf("\n"));
				const halves = splitEqualGitHeader(firstLine);
				if (halves) {
					[oldPath, newPath] = halves;
				} else {
					const header = text.match(DIFF_GIT_RE);
					oldPath = header?.[1] ?? null;
					newPath = header?.[2] ?? null;
				}
			}
		}

		results.push({ oldPath, newPath, isBinary, oldIsSymlink, newIsSymlink, modeUnknown });
	}

	return results;
}

/** Adapter: decode an already-unwrapped quoted capture, tolerating absence. */
function decodeQuotedGitPathCapture(capture: string | undefined): string | null {
	if (capture === undefined) return null;
	return decodeQuotedGitPath(capture);
}

async function getGitFileContent(
	cwd: string,
	ref: string,
	filePath: string,
): Promise<string | null> {
	try {
		const { stdout } = await execFileAsync("git", ["show", `${ref}:${filePath}`], {
			cwd,