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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 = {
      git.client.enable = true;
      gnupg.enable = true;
      password-store.enable = true;
      profiles.dev.enable = true;
      profiles.email.enable = true;
    };

    hm = {
      stylix.targets.emacs.enable = false;

      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
              ${getExe git.package} clone --depth=1 --branch=master \
                "https://github.com/doomemacs/doomemacs" "$EMACSDIR"
            fi

            if [[ ! -d "$DOOMDIR/snippets" ]]; then
              mkdir -p "$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
              extraBins = with pkgs;
                [
                  (aspellWithDicts (p: with p; [en ru])) # :checkers (spell +aspell)
                  asmfmt # :editor format
                  cargo # :lang rust
                  clang-tools # :lang (cc +lsp) :editor format
                  cmake-format # :lang cc :editor format
                  cmigemo # :lang japanese
                  config.hm.programs.emacs.package # !doom
                  config.nix.package # !doom
                  delve # :lang go :tools debugger
                  dockerfile-language-server-nodejs # :tools (docker +lsp)
                  dockfmt # :tools docker :editor format
                  editorconfig-core-c # :tools editorconfig
                  fd # doom!
                  gcc # :lang cc
                  ghc # :lang haskell
                  gnuplot # :lang (org +gnuplot)
                  gnutar # :tools tree-sitter
                  gnutls # doom! :app irc
                  go # :lang go
                  godef # :lang go
                  gomodifytags # :lang go
                  gopls # :lang (go +lsp)
                  gore # :lang go
                  gotests # :lang go
                  gotools # :lang go
                  graphviz # :lang (org +roam2) :lang plantuml
                  gzip # :tools tree-sitter
                  haskellPackages.cabal-fmt # :lang haskell :editor format
                  haskellPackages.cabal-install # :lang haskell
                  haskellPackages.haskell-language-server # :lang (haskell +lsp)
                  haskellPackages.hoogle # :lang haskell
                  haskellPackages.ormolu # :lang haskell :editor format
                  html-tidy # :lang web :editor format
                  jdk # :lang java :lang plantuml :checkers grammar
                  languagetool # :checkers grammar
                  libxml2 # :lang data :editor format
                  markdownlint-cli # :lang markdown
                  nil # :lang (nix +lsp)
                  nls # :lang (nickel +lsp)
                  nodePackages.bash-language-server # :lang (sh +lsp)
                  nodePackages.eslint # :lang (json +lsp)
                  nodePackages.js-beautify # :lang web
                  nodePackages.prettier # :editor format
                  nodePackages.stylelint # :lang web
                  nodePackages.vscode-css-languageserver-bin # lang (web +lsp)
                  nodePackages.vscode-html-languageserver-bin # lang (web +lsp)
                  nodePackages.vscode-json-languageserver-bin # lang (json +lsp)
                  nodejs # :tools debugger
                  pandoc # :lang org markdown latex
                  pinentry-emacs # doom!
                  pipenv # :lang python
                  poetry # :lang python
                  pre-commit # :tools magit
                  python3 # :lang python
                  python3Packages.black # :lang python :editor format
                  python3Packages.isort # :lang python :editor format
                  python3Packages.nose # :lang python
                  python3Packages.pyflakes # :lang python :editor format
                  python3Packages.pytest # :lang python
                  python3Packages.python-lsp-server # :lang python :editor format
                  ripgrep # doom!
                  rust-analyzer # :lang (rust +lsp)
                  rustc # :lang rust
                  rustfmt # :lang rust
                  shellcheck # :lang sh
                  shfmt # :lang sh :editor format
                  sqlite # :lang (org +roam2) :tools lookup
                  terraform-ls # :tools (terraform +lsp)
                  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)
                  zig # :lang zig :editor format
                  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
                );

              parinferRustLibrary =
                if (hasSuffix "linux" this.system)
                then "${pkgs.parinfer-rust}/lib/libparinfer_rust.so"
                else "${pkgs.parinfer-rust}/lib/libparinfer_rust.dylib";
            in ''
              ;; 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
              }"))

              ;; HACK Explicitly load specific Emacs packages from Nixpkgs.
              ;; For some reason providing them as "extraPackages" doesn't
              ;; work.
              (add-to-list 'load-path "${pkgs.mu.mu4e}/share/emacs/site-lisp/mu4e")
              (add-to-list 'load-path "${pkgs.emacsPackages.vterm}/share/emacs/site-lisp/elpa/vterm-${pkgs.emacsPackages.vterm.version}")

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

              ;; :input japanese
              (setq migemo-dictionary "${pkgs.cmigemo}/share/migemo/utf-8/migemo-dict"
                    skk-large-jisyo "${pkgs.skk-dicts}/share/SKK-JISYO.L")

              ;; :editor parinfer
              (setq parinfer-rust-auto-download nil
                    parinfer-rust-library "${parinferRustLibrary}")

              ;; :lang nix
              ;; HACK Trick `nix-mode' to use alejandra instead of nixfmt.
              (setq nix-nixfmt-bin "${pkgs.writeShellScript "nixfmt" ''
                ${getExe pkgs.alejandra} "$@"
              ''}")

              ;; :lang (org +roam2) :email mu4e
              (setq emacsql-sqlite-executable "${getExe pkgs.emacsql-sqlite}")

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

              ;; :app irc
              (setq circe-default-nick "${my.username}"
                    circe-default-realname "${my.email}"
                    circe-default-user circe-default-nick)
            '')
            (with config.stylix.fonts; ''
              (setq doom-font "${monospace.name}-${toString sizes.terminal}"
                    doom-serif-font "${serif.name}-${toString sizes.terminal}"
                    doom-variable-pitch-font "${sansSerif.name}-${toString sizes.terminal}")
            '')
            (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.emacs29;
        };

        bash.initExtra = mkAfter ''
          export PATH="$PATH:$XDG_CONFIG_HOME/emacs/bin"

          # https://github.com/akermu/emacs-libvterm
          if [[ "$INSIDE_EMACS" = vterm ]] && [[ -n "$EMACS_VTERM_PATH" ]] && [[ -f "$EMACS_VTERM_PATH/etc/emacs-vterm-bash.sh" ]]; then
              source "$EMACS_VTERM_PATH/etc/emacs-vterm-bash.sh"
          fi

          # Not sourced from inside Emacs for some reason. Maybe it's not
          # considered an interactive shell?
          [[ -f ~/.profile ]] && . ~/.profile
        '';
      };
    };
  };
}