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{
  config,
  inputs,
  lib,
  localUsername ? lib.my.username,
  pkgs,
  this,
  ...
}:
with lib; let
  cfg = config.nixfiles.modules.emacs;
in {
  options.nixfiles.modules.emacs.enable = mkEnableOption "GNU Emacs";

  config = mkIf cfg.enable {
    secrets.authinfo = {
      file = "${inputs.self}/secrets/authinfo";
      owner = localUsername;
    };

    nixfiles.modules = {
      fonts.enable = true;
      git.client.enable = true;
      gnupg.enable = true;
    };

    hm = {
      xdg.configFile = mapAttrs (_: value:
        value
        // {
          onChange = with config.hm.programs; ''
            export EMACSDIR="''${XDG_CONFIG_HOME:-$HOME/.config}/emacs"
            export DOOMDIR="''${XDG_CONFIG_HOME:-$HOME/.config}/doom"

            if [[ ! -d "$EMACSDIR/.git" ]]; then
              ${git.package}/bin/git clone --depth=1 --branch=master \
                "https://github.com/doomemacs/doomemacs" "$EMACSDIR"
            fi

            if [[ ! -d "$DOOMDIR" ]]; then
              mkdir -p "$DOOMDIR/snippets"
            fi

            if [[ -x "$EMACSDIR/bin/doom" ]]; then
              if [[ ! -d "$EMACSDIR/.local" ]]; then
                PATH="''${PATH:-/bin:/usr/bin:/usr/local/bin}:${emacs.package}/bin:${git.package}/bin" \
                  "$EMACSDIR/bin/doom" install --force --verbose
              fi

              PATH="''${PATH:-/bin:/usr/bin:/usr/local/bin}:${emacs.package}/bin:${git.package}/bin" \
                "$EMACSDIR/bin/doom" sync -e -p --force --verbose
            fi
          '';
        }) {
        "doom/init.el".source = ./doom/init.el;
        "doom/packages.el".source = ./doom/packages.el;
        "doom/config.el" = {
          text = concatLines [
            (
              let
                # NOTE gopls will require the "go" executable which must be provided
                # by the project's flake/shell.
                extraBins = with pkgs;
                  [
                    (aspellWithDicts (p: with p; [en ru])) # :checkers (spell +aspell)
                    (python3.withPackages (p:
                      with p; [
                        black # :lang python :editor format
                        isort # :lang python
                        pyflakes # :lang python
                        python-lsp-server # :lang (python +lsp)
                      ]))
                    asmfmt # :editor format
                    bash-language-server # :lang (sh +lsp)
                    clang-tools # :lang (cc +lsp) :editor format
                    cmake # :term vterm
                    cmake-format # :lang cc :editor format
                    cmigemo # :lang japanese
                    css-language-server # :lang (web +lsp)
                    dhall-language-server # :lang (dhall +lsp)
                    dockerfile-language-server # :tools (docker +lsp)
                    editorconfig # :tools editorconfig
                    fd # doom!
                    gcc # :tools magit :term vterm
                    gnumake # :term vterm
                    gnuplot # :lang (org +gnuplot)
                    gnutls # doom!
                    go-language-server # :lang (go +lsp)
                    gomodifytags # :lang go
                    gore # :lang go
                    gotests # :lang go
                    gotools # :lang go
                    graphviz # :lang (org +roam2) :lang plantuml
                    html-language-server # :lang (web +lsp)
                    html-tidy # :lang web
                    jre # :lang plantuml
                    json-language-server # :lang (json +lsp)
                    libtool # :term vterm
                    nix-language-server # :lang (nix +lsp)
                    nodePackages.eslint # :lang (json +lsp)
                    nodePackages.js-beautify # :lang web
                    nodePackages.prettier # :editor format
                    nodePackages.stylelint # :lang web
                    nodejs # :tools debugger
                    pandoc # :lang org markdown latex
                    perl # term vterm
                    pinentry-emacs # doom!
                    pre-commit # :tools magit
                    ripgrep # doom!
                    rust-analyzer # :lang (rust +lsp)
                    rustfmt # :lang rust
                    shellcheck # :lang sh
                    shfmt # :lang sh :editor format
                    sqlite # :lang (org +roam2) :tools lookup
                    texlab # lang (tex +lsp)
                    texlive.combined.scheme-full # :lang org tex
                    unzip # :tools debugger
                    wordnet # :tools (lookup +dictionary +offline)
                    yaml-language-server # :lang (yaml +lsp)
                    zls # :lang (zig +lsp)
                    zstd # :emacs undo
                  ]
                  ++ (
                    # GDB doesn't support[1] Apple Silicon.
                    #
                    # [1]: https://inbox.sourceware.org/gdb/6b48224b-9e2e-518d-793b-df4fc5514884@arm.com/
                    if (this.system != "aarch64-darwin")
                    then [gdb] # :tools debugger
                    else [lldb] # :tools debugger
                  )
                  ++ optionals (!pkgs.stdenv.isDarwin)
                  [
                    # NOTE Haskell is pretty much broken every couple of days on
                    # MacOS and I usually don't write anything in Haskell while
                    # I'm on my work laptop, so... ShellCheck seems to be working,
                    # though.
                    haskellPackages.ormolu # :lang haskell :editor format
                    haskellPackages.haskell-language-server # :lang (haskell +lsp)
                    haskellPackages.cabal-fmt # :lang haskell :editor format
                    haskellPackages.cabal-install # :lang haskell
                    haskellPackages.hoogle # :lang haskell
                  ];
              in ''
                ;; This will integrate packages which are required by various
                ;; modules without polluting the user's profile.
                (setq exec-path (append exec-path '(${
                  concatMapStringsSep " " (x: ''"${x}/bin"'') extraBins
                })))
                (setenv "PATH" (concat (getenv "PATH") ":${
                  concatMapStringsSep ":" (x: "${x}/bin") extraBins
                }"))

                (appendq! auth-sources '("${config.secrets.authinfo.path}"))

                ;; Font must be set to N+2 because otherwise it looks too small.
                (setq doom-font (font-spec
                                  :family "${config.fontScheme.monospaceFont.family}"
                                  :size ${toString (config.fontScheme.monospaceFont.size + 2)})
                      doom-unicode-font doom-font)

                ;; :app irc
                (setq circe-default-nick "${my.username}"
                      circe-default-realname "${my.email}"
                      circe-default-user circe-default-nick)

                ;; :lang plantuml
                (setq org-plantuml-jar-path "${pkgs.plantuml}/lib/plantuml.jar")

                ;; :input japanese
                (setq migemo-dictionary "${pkgs.cmigemo}/share/migemo/utf-8/migemo-dict")

                ;; :input japanese
                ;; (setq skk-large-jisyo "${pkgs.skk-dicts}/share/skk/SKK-JISYO.L")

                ;; :lang nix
                (setq nix-nixfmt-bin "${pkgs.writeShellScript "nixfmt" ''
                  ${pkgs.alejandra}/bin/alejandra --quiet "$@"
                ''}")
              ''
            )
            (with config.hm.accounts.email; let
              mu4eAccounts = let
                muAccounts = filter (a: a.mu.enable) (attrValues accounts);
              in
                concatMapStringsSep "\n"
                (a:
                  with a; let
                    personalAddresses = concatMapStringsSep " " (v: ''"${v}"'') aliases;
                  in ''
                    (set-email-account! "${name}"
                      '((user-full-name           . "${realName}")
                        (user-mail-address        . "${address}")
                        (mu4e-inbox-folder        . "/${name}/${folders.inbox}")
                        (mu4e-sent-folder         . "/${name}/${folders.sent}")
                        (mu4e-drafts-folder       . "/${name}/${folders.drafts}")
                        (mu4e-trash-folder        . "/${name}/${folders.trash}")
                        (mu4e-refile-folder       . "/${name}/Archive")
                        (+mu4e-personal-addresses . (${personalAddresses})))
                      t)
                  '')
                muAccounts;
            in ''
              (setq mu4e-root-maildir "${maildirBasePath}")

              ${mu4eAccounts}
            '')
            (builtins.readFile ./doom/config.el)
          ];
        };
      };

      programs.emacs = {
        enable = true;
        package = pkgs.emacs28; # Pin to avoid surprises.
      };
    };
  };
}

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