Function fetchContent

packages/cli/src/routes/diff.ts:198–205

(
	repoRoot: string,
	ref: string | "DISK",
	filePath: string,
)

		// Modified binaries emit only `diff --git` + `Binary files ... differ`
		// (no ---/+++, no rename lines); parse the header itself so images can
		// still reach the image diff viewer.
		if (oldPath === null && newPath === null) {
			const quoted = text.match(DIFF_GIT_QUOTED_RE);
			if (quoted) {
				oldPath = decodeQuotedGitPathCapture(quoted[1]);
				newPath = decodeQuotedGitPathCapture(quoted[2]);
			} else {
				const firstLine = text.slice(0, text.indexOf("\n") === -1 ? undefined : text.indexOf("\n"));
				const halves = splitEqualGitHeader(firstLine);
				if (halves) {