niri-flake/fetch-refs.nix at main · sodiboo/niri-flake · GitHub

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with builtins;
let
  fetch =
    repo:
    foldl' (x: f: f x) "https://api.github.com/repos/${repo}/git/refs/tags" [
      fetchurl
      readFile
      fromJSON

      (map (
        y:
        if y.object.type == "tag" then
          # on basically all releases, the ref points to a tag
          # this is neat, because it wraps the commit hash in a `tag` name.
          foldl' (x: f: f x) y.object.url [
            fetchurl
            readFile
            fromJSON
          ]
        else
          let
            startsWith = prefix: string: substring 0 (stringLength prefix) string == prefix;
            removePrefix =
              prefix: string:
              assert startsWith prefix string;
              substring (stringLength prefix) (stringLength string) string;
          in
          # but on some releases, the ref directly points to the commit
          # then we have to manually extract the ""tag"" name (not a real tag; but to humans there is no difference)
          y // { tag = removePrefix "refs/tags/" y.ref; }
      ))

      (filter (x: x.object.type == "commit"))

      (map (x: ''"${x.object.sha}" = "${x.tag}";''))

      (concatStringsSep "\n  ")
    ];
in
''
  # This file is generated automatically by fetch-refs.nix
  # Do not edit it manually, your changes will be lost.
  #
  # Both niri and xwayland-satellite are listed.
  # This is because commit hashes are globally unique.
  {
    # niri
    ${fetch "YaLTeR/niri"}
    # xwayland-satellite
    ${fetch "Supreeeme/xwayland-satellite"}
  }
''