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/**
* Root finder — nearest ancestor containing a marker file, bounded at cwd.
*/
export async function findRoot(
startDir: string,
cwd: string,
markers: readonly string[],
exists: (path: string) => Promise<boolean>,
): Promise<string> {
const normalizedStart = normalizePath(startDir);
const normalizedCwd = normalizePath(cwd);
let current = normalizedStart;
while (true) {
for (const marker of markers) {
const markerPath = current === "/" ? `/${marker}` : `${current}/${marker}`;
if (await exists(markerPath)) {
return current;
}
}
if (current === normalizedCwd || current === "/") {
return normalizedCwd;
}
const parent = getParent(current);
if (parent === current) return normalizedCwd;
current = parent;
}
}
function normalizePath(p: string): string {
let normalized = p.replace(/\\/g, "/");
if (normalized.length > 1 && normalized.endsWith("/")) {
normalized = normalized.slice(0, -1);
}
return normalized || "/";
}
function getParent(p: string): string {
if (p === "/") return "/";
const lastSlash = p.lastIndexOf("/");
if (lastSlash <= 0) return "/";
return p.slice(0, lastSlash) || "/";
}
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