{
  description = "Mobilizon fork for potsda.mn";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    nix-filter.url = "github:numtide/nix-filter";
  };

  outputs = { self, nixpkgs, nix-filter }:
    let
      system = "x86_64-linux";
      pkgs = import nixpkgs { inherit system; };
      filter = nix-filter.lib;
    in
    {

      packages.x86_64-linux = {
        mobilizon = pkgs.callPackage ./. {
          src = filter {
            root = ./.;
            exclude = [
              (filter.matchExt "nix")
              "js"
            ];
          };
          src-config = ./config;
          mobilizon-js = self.packages.x86_64-linux.mobilizon-frontend;
        };

        mobilizon-frontend = pkgs.callPackage ./js { inherit filter; };

        default = self.packages.x86_64-linux.mobilizon;

        # Update local Mobilizon definition
        update =
          pkgs.writeShellScriptBin "update" ''
            set -eou pipefail

            ${pkgs.mix2nix}/bin/mix2nix ./mix.lock > mix.nix
          '';
      };

      devShells.x86_64-linux.default =
        pkgs.mkShell {
          buildInputs = with pkgs; [
            elixir
            mix2nix
            cmake
            imagemagick
            (yarn.override {
              nodejs = nodejs-18_x;
            })
            yarn2nix
            nodejs-18_x
          ];
        };

      checks.x86_64-linux = {
        inherit (self.packages.x86_64-linux) mobilizon update;
      };

      lib = {
        # Patch the logos in a built Mobilizon package, so we don't have to do it in the source tree.
        mobilizonPatchLogos = pkg: icons:
          let
            inherit (icons) logo favicon;
            faviconDir = "./lib/mobilizon-${pkg.version}/priv/static";
            iconDir = "${faviconDir}/img/icons";
          in
          pkgs.stdenvNoCC.mkDerivation {
            inherit (pkg) name pname version;
            src = pkg;
            nativeBuildInputs = [ pkgs.imagemagick ];
            patchPhase = ''
              cp '${logo}' js/src/assets/logo.svg

              magick convert \
                -resize x16 \
                -gravity center \
                -crop 16x16+0+0 \
                -flatten \
                -colors 256 \
                '${favicon}' \
                ${iconDir}/favicon-16x16.png

              magick convert \
                -resize x32 \
                -gravity center \
                -crop 32x32+0+0 \
                -flatten \
                -colors 256 \
                '${favicon}' \
                ${iconDir}/favicon-32x32.png


              magick convert \
                -resize x16 \
                -gravity center \
                -crop 16x16+0+0 \
                -flatten \
                -colors 256 \
                '${favicon}' \
                favicon-16x16.ico

              magick convert \
                -resize x32 \
                -gravity center \
                -crop 32x32+0+0 \
                -flatten \
                -colors 256 \
                '${favicon}' \
                favicon-32x32.ico

              magick convert \
                -resize x48 \
                -gravity center \
                -crop 48x48+0+0 \
                -flatten \
                -colors 256 \
                '${favicon}' \
                favicon-48x48.ico

              magick convert favicon-16x16.ico favicon-32x32.ico favicon-48x48.ico ${faviconDir}/favicon.ico
              rm favicon-16x16.ico favicon-32x32.ico favicon-48x48.ico

              cp '${favicon}' ${iconDir}/favicon.svg
              cp '${favicon}' ${iconDir}/safari-pinned-tab.svg

              magick convert \
                '${favicon}' \
                -gravity center \
                -extent 630x350 \
                ${faviconDir}/img/mobilizon_default_card.png

              magick convert \
                -background '#e08c96' \
                '${logo}' \
                -resize 366x108 \
                ${faviconDir}/img/mobilizon_logo.png

            '' + nixpkgs.lib.concatMapStrings
              ({ resize, filename }: ''
                magick convert \
                  -resize x${resize} \
                  '${favicon}' \
                  ${iconDir}/${filename}

              '')
              [
                { resize = "180"; filename = "apple-touch-icon.png"; }
                { resize = "180"; filename = "apple-touch-icon-180x180.png"; }
                { resize = "152"; filename = "apple-touch-icon-152x152.png"; }
                { resize = "120"; filename = "apple-touch-icon-120x120.png"; }
                { resize = "76"; filename = "apple-touch-icon-76x76.png"; }
                { resize = "60"; filename = "apple-touch-icon-60x60.png"; }
                { resize = "192"; filename = "android-chrome-192x192.png"; }
                { resize = "512"; filename = "android-chrome-512x512.png"; }
                { resize = "192"; filename = "android-chrome-maskable-192x192.png"; }
                { resize = "512"; filename = "android-chrome-maskable-512x512.png"; }
                { resize = "128"; filename = "badge-128x128.png"; }
                { resize = "144"; filename = "icon-144x144.png"; }
                { resize = "168"; filename = "icon-168x168.png"; }
                { resize = "256"; filename = "icon-256x256.png"; }
                { resize = "48"; filename = "icon-48x48.png"; }
                { resize = "72"; filename = "icon-72x72.png"; }
                { resize = "96"; filename = "icon-96x96.png"; }
                { resize = "144"; filename = "msapplication-icon-144x144.png"; }
                { resize = "150"; filename = "mstile-150x150.png"; }
                { resize = "192"; filename = "android-chrome-192x192.png"; }
                { resize = "512"; filename = "android-chrome-512x512.png"; }
                { resize = "192"; filename = "android-chrome-maskable-192x192.png"; }
                { resize = "512"; filename = "android-chrome-maskable-512x512.png"; }
              ];


            installPhase = "cp -R ./ $out";
          };

      };


    };
}