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path: root/modules/common/emacs/default.nix
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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;
      password-store.enable = true;
      profiles.dev.enable = true;
      profiles.email.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
              ${getExe git.package} clone --depth=1 --branch=master \
                "https://github.com/doomemacs/doomemacs" "$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 Packages required for vterm here are mostly only used for
                # initially compiling the libvterm library.
                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 # :lang cc :term vterm
                    cmake-format # :lang cc :editor format
                    cmigemo # :lang japanese
                    dockerfile-language-server-nodejs # :tools (docker +lsp)
                    dockfmt # :tools docker :editor format
                    editorconfig-core-c # :tools editorconfig
                    fd # doom!
                    gcc # :lang cc :term vterm
                    ghc # :lang haskell
                    gnumake # :term vterm
                    gnuplot # :lang (org +gnuplot)
                    gnutls # doom!
                    go # :lang go
                    gocode # :lang go org
                    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
                    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
                    jre # :lang plantuml
                    libtool # :term vterm
                    libxml2 # :lang data :editor format
                    nil # :lang (nix +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
                    nodejs # :tools debugger
                    pandoc # :lang org markdown latex
                    perl # :term vterm
                    pinentry-emacs # doom!
                    pipenv # :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
                    racket # :lang racket scheme :editor format
                    ripgrep # doom!
                    rust-analyzer # :lang (rust +lsp)
                    rustc # :lang rust
                    rustfmt # :lang rust
                    sbcl # :lang common-lisp
                    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)
                    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
                  );
              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
                }"))

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

                (setq emacsql-sqlite-executable "${getExe pkgs.emacsql-sqlite}")

                ;; The font must be set to n+2, 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 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)

                ;; :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
                ;; HACK Trick `nix-mode' to use alejandra instead of nixfmt.
                (setq nix-nixfmt-bin "${pkgs.writeShellScript "nixfmt" ''
                  ${getExe pkgs.alejandra} "$@"
                ''}")
              ''
            )
            (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 ''
              ;; HACK Load missing site-lisp for `mu4e'.
              (add-to-list 'load-path "${pkgs.mu.mu4e}/share/emacs/site-lisp/mu4e")

              (setq mu4e-root-maildir "${maildirBasePath}")

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

      programs = {
        emacs = {
          enable = true;
          package =
            (pkgs.emacs29.override (finalAttrs: {
              stdenv = pkgs.useMoldLinker finalAttrs.stdenv;
            }))
            .overrideAttrs (_: final: {
              configureFlags =
                (final.configureFlags or [])
                ++ [
                  "--without-mailutils"
                  "--without-pop"
                ];
            });
        };

        bash.initExtra = mkAfter ''
          # 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"

              message() {
                  vterm_cmd message "%s" "$*"
              }

              find-file() {
                  vterm_cmd find-file "$(realpath "''${@:-.}")"
              }
          fi
        '';
      };
    };
  };
}