feat(i18n): proper multilingual input

Use fcitx5 to switch between different inputs. Installed mozc-ut for
Japanese input with the bepo layout, as well as fcitx5-chinese to load
table-defined layouts for the IPA/X-SAMPA input method.

Currently, mozc_server and fcitx5 need to be launched by the
compositor (only Hyprland for now), auto-launching from module options
needs to be implemented in the future.

hosts/gampo/configuration.nix

@@ -41,6 +41,7 @@
       };
       sound.enable = true;
     };
+    i18n.input.enable = true;
     misc.keymap = "fr-bepo";
     networking = {
       hostname = "gampo";

hosts/marpa/configuration.nix

@@ -86,6 +86,7 @@
         scarlett.enable = true;
       };
     };
+    i18n.input.enable = true;
     misc.keymap = "fr-bepo";
     networking = {
       hostname = "marpa";

system/i18n/default.nix

@@ -1,5 +1,6 @@
 {
   imports = [
+    ./input.nix
     ./locale.nix
   ];
 }

system/i18n/input.nix

@@ -0,0 +1,24 @@
+{
+  lib,
+  config,
+  ...
+}:
+with lib; let
+  cfg = config.mySystem.i18n.input;
+in {
+  options.mySystem.i18n.input.enable = mkEnableOption "Enable i18n input with fcitx5";
+
+  config.i18n.inputMethod = mkIf cfg.enable {
+    enable = true;
+    type = "fcitx5";
+    fcitx5.addons = with pkgs; [
+      fcitx5-gtk
+      fcitx5-mozc-ut # Japanese input support
+      fcitx5-nord
+      fcitx5-table-other # X-SAMPA to IPA support
+      qt6Packages.fcitx5-chinese-addons # allow to load table addons
+      qt6Packages.fcitx5-configtool
+      qt6Packages.fcitx5-with-addons
+    ];
+  };
+}

users/modules/desktop/hyprland.nix

@@ -50,10 +50,13 @@ in {
       systemd.enable = false;
       importantPrefixes = ["$left" "$right" "$up" "$down" "$menu"];
       settings = {
+        env = [
+          "XMODIFIERS,@im=fcitx"
+          "XCURSOR_SIZE,12"
+        ];
         input = {
           kb_layout = "fr,us";
           kb_variant = "bepo_afnor,";
-          # kb_options = "caps:ctrl_modifier";
           numlock_by_default = true;
           follow_mouse = 1;
           touchpad.natural_scroll = false;
@@ -106,6 +109,8 @@ in {
             "pactl load-module module-switch-on-connect"
             "${pkgs.mpc}/bin/mpc stop"
             "${pkgs.polkit_gnome}/libexec/polkit-gnome-authentication-agent-1"
+            "${pkgs.mozc}/lib/mozc/mozc_server"
+            "${pkgs.fcitx5}/bin/fcitx5 -d"
           ]
           ++ lib.lists.optional (! caelestiaEnabled) "${pkgs.networkmanagerapplet}/bin/nm-applet";
       };
@@ -170,8 +175,6 @@ in {
         bind = SUPER_SHIFT, minus, movetoworkspace, 8
         bind = SUPER_SHIFT, slash, movetoworkspace, 9
         bind = SUPER_SHIFT, asterisk, movetoworkspace, 10
-
-        env = XCURSOR_SIZE,12
       '';
     };
   };

users/phundrak/home.nix

@@ -157,16 +157,19 @@
         vcs.jj.signing.enable = true;
       };
       fullDesktop = true;
-      file."${config.home.homeDirectory}/.ssh/allowed_signers" = {
-        enable = true;
-        text = lib.strings.join "\n" (
-          map (file: let
-            content = lib.strings.trim (builtins.readFile file);
-            parts = lib.strings.splitString " " content;
-            email = lib.lists.last parts;
-          in "${email} namespaces=\"git\" ${content}")
-          (lib.filesystem.listFilesRecursive ./keys)
-        );
+      file = {
+        ".XCompose".source = ./XCompose;
+        "${config.home.homeDirectory}/.ssh/allowed_signers" = {
+          enable = true;
+          text = lib.strings.join "\n" (
+            map (file: let
+              content = lib.strings.trim (builtins.readFile file);
+              parts = lib.strings.splitString " " content;
+              email = lib.lists.last parts;
+            in "${email} namespaces=\"git\" ${content}")
+            (lib.filesystem.listFilesRecursive ./keys)
+          );
+        };
       };
     };