diff --git a/common/home-manager/emacs/default.nix b/common/home-manager/emacs/default.nix
index 50a96c1..bbfcc50 100644
--- a/common/home-manager/emacs/default.nix
+++ b/common/home-manager/emacs/default.nix
@@ -6,7 +6,7 @@ let cfg = config.within.emacs;
 in {
   options.within.emacs.enable =
     mkEnableOption "emacs without spacemacs support";
-  imports = [ ./emacs-init.nix ];
+  imports = [ ./emacs-init.nix ./emacs-init-defaults.nix ];
 
   config = mkIf cfg.enable {
     home.file."bin/e" = {
@@ -387,7 +387,6 @@ in {
           org-roam-ui.enable = true;
           org-roam-protocol.enable = true;
 
-          weechat.enable = true;
           systemd.enable = true;
 
           gemini-mode.enable = true;
diff --git a/common/home-manager/emacs/emacs-init-defaults.nix b/common/home-manager/emacs/emacs-init-defaults.nix
new file mode 100644
index 0000000..a2fc172
--- /dev/null
+++ b/common/home-manager/emacs/emacs-init-defaults.nix
@@ -0,0 +1,144 @@
+# A collection of "uncontroversial" configurations for selected packages.
+
+{ pkgs, lib, config, ... }:
+
+{
+  programs.emacs.init.usePackage = {
+    cmake-mode.mode = [
+      ''"\\.cmake\\'"'' # \
+      ''"CMakeLists.txt\\'"''
+    ];
+
+    csharp-mode.mode = [ ''"\\.cs\\'"'' ];
+
+    cue-mode = {
+      package = epkgs:
+        epkgs.trivialBuild {
+          pname = "cue-mode.el";
+          src = pkgs.fetchurl {
+            url =
+              "https://raw.githubusercontent.com/russell/cue-mode/9c803ee8fa4a6e99c7dc9ae373c6178569583b7a/cue-mode.el";
+            sha256 = "0swhpknkg1vwbchblzrwynixf5grg95jy1bkc8w92yfpb1jch7m7";
+          };
+          preferLocalBuild = true;
+          allowSubstitutes = true;
+        };
+      command = [ "cue-mode" ];
+      mode = [ ''"\\.cue\\'"'' ];
+      hook = [ "(cue-mode . subword-mode)" ];
+    };
+
+    dap-lldb = {
+      config = ''
+        (setq dap-lldb-debug-program "${pkgs.lldb}/bin/lldb-vscode")
+      '';
+    };
+
+    deadgrep = {
+      config = ''
+        (setq deadgrep-executable "${pkgs.ripgrep}/bin/rg")
+      '';
+    };
+
+    dhall-mode.mode = [ ''"\\.dhall\\'"'' ];
+
+    dockerfile-mode.mode = [ ''"Dockerfile\\'"'' ];
+
+    elm-mode.mode = [ ''"\\.elm\\'"'' ];
+
+    emacsql-sqlite3 = {
+      enable =
+        lib.mkDefault config.programs.emacs.init.usePackage.org-roam.enable;
+      defer = lib.mkDefault true;
+      config = ''
+        (setq emacsql-sqlite3-executable "${pkgs.sqlite}/bin/sqlite3")
+      '';
+    };
+
+    ggtags = {
+      config = ''
+        (setq ggtags-executable-directory "${pkgs.global}/bin")
+      '';
+    };
+
+    idris-mode = {
+      mode = [ ''"\\.idr\\'"'' ];
+      config = ''
+        (setq idris-interpreter-path "${pkgs.idris}/bin/idris")
+      '';
+    };
+
+    kotlin-mode = {
+      mode = [ ''"\\.kts?\\'"'' ];
+      hook = [ "(kotlin-mode . subword-mode)" ];
+    };
+
+    latex.mode = [ ''("\\.tex\\'" . latex-mode)'' ];
+
+    lsp-eslint = {
+      config = ''
+        (setq lsp-eslint-server-command '("node" "${pkgs.vscode-extensions.dbaeumer.vscode-eslint}/share/vscode/extensions/dbaeumer.vscode-eslint/server/out/eslintServer.js" "--stdio"))
+      '';
+    };
+
+    markdown-mode = {
+      mode = [ ''"\\.mdwn\\'"'' ''"\\.markdown\\'"'' ''"\\.md\\'"'' ];
+    };
+
+    nix-mode.mode = [ ''"\\.nix\\'"'' ];
+
+    notmuch = {
+      package = epkgs: lib.getOutput "emacs" pkgs.notmuch;
+      config = ''
+        (setq notmuch-command "${pkgs.notmuch}/bin/notmuch")
+      '';
+    };
+
+    octave.mode = [ ''("\\.m\\'" . octave-mode)'' ];
+
+    ob-plantuml = {
+      config = ''
+        (setq org-plantuml-jar-path "${pkgs.plantuml}/lib/plantuml.jar")
+      '';
+    };
+
+    org-roam = {
+      defines = [ "org-roam-graph-executable" ];
+      config = ''
+        (setq org-roam-graph-executable "${pkgs.graphviz}/bin/dot")
+      '';
+    };
+
+    pandoc-mode = {
+      config = ''
+        (setq pandoc-binary "${pkgs.pandoc}/bin/pandoc")
+      '';
+    };
+
+    php-mode.mode = [ ''"\\.php\\'"'' ];
+
+    plantuml-mode = {
+      mode = [ ''"\\.puml\\'"'' ];
+      config = ''
+        (setq plantuml-default-exec-mode 'executable
+              plantuml-executable-path "${pkgs.plantuml}/bin/plantuml")
+      '';
+    };
+
+    protobuf-mode.mode = [ ''"\\.proto\\'"'' ];
+
+    purescript-mode.mode = [ ''"\\.purs\\'"'' ];
+
+    ripgrep = {
+      config = ''
+        (setq ripgrep-executable "${pkgs.ripgrep}/bin/rg")
+      '';
+    };
+
+    rust-mode.mode = [ ''"\\.rs\\'"'' ];
+
+    terraform-mode.mode = [ ''"\\.tf\\'"'' ];
+
+    yaml-mode.mode = [ ''"\\.\\(e?ya?\\|ra\\)ml\\'"'' ];
+  };
+}
diff --git a/common/home-manager/emacs/emacs-init.nix b/common/home-manager/emacs/emacs-init.nix
index 2677e86..cbd97a0 100644
--- a/common/home-manager/emacs/emacs-init.nix
+++ b/common/home-manager/emacs/emacs-init.nix
@@ -57,6 +57,14 @@ let
         '';
       };
 
+      defines = mkOption {
+        type = types.listOf types.str;
+        default = [ ];
+        description = ''
+          The entries to use for <option>:defines</option>.
+        '';
+      };
+
       demand = mkOption {
         type = types.bool;
         default = false;
@@ -210,6 +218,7 @@ let
 
         mkAfter = vs: optional (vs != [ ]) ":after (${toString vs})";
         mkCommand = vs: optional (vs != [ ]) ":commands (${toString vs})";
+        mkDefines = vs: optional (vs != [ ]) ":defines (${toString vs})";
         mkDiminish = vs: optional (vs != [ ]) ":diminish (${toString vs})";
         mkMode = map (v: ":mode ${v}");
         mkBind = mkBindHelper "bind" "";
@@ -232,8 +241,9 @@ let
         ++ mkBindStar config.bindStar ++ mkBindKeyMap config.bindKeyMap
         ++ mkBindLocal config.bindLocal ++ mkChords config.chords
         ++ mkCommand config.command ++ mkDefer config.defer
-        ++ mkDemand config.demand ++ mkDiminish config.diminish
-        ++ mkHook config.hook ++ mkMode config.mode
+        ++ mkDefines config.defines ++ mkDemand config.demand
+        ++ mkDiminish config.diminish ++ mkHook config.hook
+        ++ mkMode config.mode
         ++ optionals (config.init != "") [ ":init" config.init ]
         ++ optionals (config.config != "") [ ":config" config.config ]
         ++ optionals (config.general != "") [ ":general" config.general ]