$fs-registered-pathnames: () !default;
$fs-path-separator: eyeglass-fs-path-separator();

@mixin fs-register-path($path-id, $absolute-path) {
  $existing-path: map-get($fs-registered-pathnames, $path-id);
  @if $existing-path and $existing-path != $absolute-path {
    @error "Path " + $path-id + " already set to " + $existing-path + ". " +
           "Cannot set to " + $absolute-path + ".";
  }
  $fs-registered-pathnames:
    map-merge($fs-registered-pathnames, ($path-id: $absolute-path)) !global;
}

@function fs-absolute-path($segments...) {
  @return eyeglass-fs-absolute-path($fs-registered-pathnames, $segments...);
}

@function fs-join($segments...) {
  @return eyeglass-fs-join($segments...);
}

@function fs-exists($absolute-path) {
  @return eyeglass-fs-exists($absolute-path);
}

@function fs-list-files($directory, $glob: "*") {
  @return eyeglass-fs-list-files($directory, $glob);
}

@function fs-list-directories($directory, $glob: "*") {
  @return eyeglass-fs-list-directories($directory, $glob);
}

@function fs-parse-filename($filename) {
  @return eyeglass-fs-parse-filename($filename);
}

@function fs-info($filename) {
  @return eyeglass-fs-info($filename);
}

@function fs-read-file($filename) {
  @return eyeglass-fs-read-file($filename);
}