Function relativePath

src/pathCommands.ts:203–239

* Compute the relative path of two uris. * * This differs from the vscode version is that this doesn't normalize slash for Windows; therefore, * we can use posix path to compute relative instead of host machine specific path. * * Modified from https://github.com/microsoft/vscode/blob/f74e473238

(
    from: Uri,
    to: Uri,
    ignorePathCasing = false
)

 * Modified from https://github.com/microsoft/vscode/blob/f74e473238aca7b79c08be761d99a0232838ca4c/src/vs/base/common/resources.ts#L228-L249
 */
function relativePath(
    from: Uri,
    to: Uri,
    ignorePathCasing = false
): string | undefined {
    if (
        from.scheme !== to.scheme ||
        !isEqualAuthority(from.authority, to.authority)
    ) {
        return undefined;
    }
    if (from.scheme === UriScheme.File) {
        return path.posix.relative(uriToFsPath(from), uriToFsPath(to));
    }
    let fromPath = from.path || "/";
    const toPath = to.path || "/";
    if (ignorePathCasing) {
        // make casing of fromPath match toPath
        let i = 0;
        for (
            const len = Math.min(fromPath.length, toPath.length);
            i < len;
            i++
        ) {
            if (fromPath.charCodeAt(i) !== toPath.charCodeAt(i)) {
                if (
                    fromPath.charAt(i).toLowerCase() !==
                    toPath.charAt(i).toLowerCase()
                ) {
                    break;
                }
            }
        }
        fromPath = toPath.substr(0, i) + fromPath.substr(i);
    }
    return path.posix.relative(fromPath, toPath);
}