feat(opencode): add opencode configuration

users/modules/dev/ai/default.nix

@@ -2,7 +2,6 @@
   config,
   lib,
   pkgs,
-  inputs,
   ...
 }:
 with lib; let
@@ -12,6 +11,7 @@ in {
   imports = [
     ./claude.nix
     ./ollama.nix
+    ./opencode.nix
   ];
 
   options.home.dev.ai = {
@@ -29,8 +29,9 @@ in {
           mcpServers = mkDefault cfg.mcpServers;
         };
         ollama.enable = mkDefault cfg.enable;
+        opencode.enable = mkDefault cfg.enable;
       };
-      packages = [pkgs.lmstudio pkgs.opencode];
+      packages = [pkgs.lmstudio];
     };
     programs.mcp = mkIf (cfg.mcpServers != {}) {
       enable = true;

users/modules/dev/ai/opencode.nix

@@ -0,0 +1,105 @@
+{
+  config,
+  lib,
+  inputs,
+  pkgs,
+  ...
+}:
+with lib; let
+  inherit (pkgs.stdenv.hostPlatform) system;
+  cfg = config.home.dev.ai.opencode;
+  defaultPackageCli = inputs.opencode.packages.${system}.opencode;
+  defaultPackageDesktop = inputs.opencode.packages.${system}.desktop;
+  corsString = cors:
+    {
+      null = "";
+      string = v: trim v;
+      path = v: trim (readFile v);
+    }
+    .${
+      if cors == null
+      then "null"
+      else typeOf cors
+    };
+  corsList = domains: lists.remove "" (lists.forEach (strings.splitString "," domains) trim);
+  corsDomains = domains:
+    lists.flatten (
+      lists.forEach (lists.remove "" (lists.forEach (strings.splitString "," domains) trim)) (domain: [
+        "--cors"
+        domain
+      ])
+    );
+in {
+  options.home.dev.ai.opencode = {
+    enable = mkEnableOption "Enables OpenCode";
+    package = mkOption {
+      type = types.package;
+      default = defaultPackageCli;
+      description = "The CLI package for OpenCode";
+    };
+    settings = mkOption {
+      type = types.json;
+      default = {};
+    };
+    tui = mkOption {
+      type = types.json;
+      default = {};
+    };
+    desktop = {
+      enable = mkEnableOption "Enables the desktop app";
+      package = mkOption {
+        type = types.package;
+        default = defaultPackageDesktop;
+        description = "The desktop package for OpenCode";
+      };
+    };
+    web = {
+      enable = mkEnableOption "Enables OpenCode web";
+      extraArgs = mkOption {
+        type = types.listOf types.str;
+        default = [];
+        example = [
+          "--hostname"
+          "0.0.0.0"
+        ];
+      };
+      cors = mkOption {
+        type = types.nullOr (types.either types.str types.path);
+        default = null;
+        example = "opencode.example.com,code.example.com";
+        description = ''
+          Either a string containing the domain allowed to connect to OpenCode’s web instance, or a file containing the target value. The latter is useful when using secret management if you don’t want to publicize the hostname of your OpenCode instance.
+
+          If you want to use multiple domains, you can separate them with a comma.
+        '';
+      };
+      mdns = {
+        enable = mkEnableOption "Enables mDNS with OpenCode";
+        hostname = mkOption {
+          type = types.nullOr types.str;
+          default = null;
+          example = "opencode.local";
+        };
+      };
+    };
+  };
+  config.programs.opencode = mkIf cfg.enable {
+    inherit (cfg) enable tui;
+    enableMcpIntegration = true;
+    extraPackages = with pkgs; [uv];
+    settings = let
+      cors = corsString cfg.web.cors;
+    in
+      {
+        server = mkIf cfg.web.mdns.enable {
+          mdns = true;
+          mdnsDomain = mkIf (cfg.web.mdns.hostname != null) cfg.web.mdns.hostname;
+          cors = corsList cfg.web.cors;
+        };
+      }
+      // cfg.settings;
+    web = {
+      inherit (cfg.web) enable extraArgs;
+    };
+  };
+}

users/phundrak/ai.nix

@@ -0,0 +1,52 @@
+{config, ...}: {
+  home.dev.ai = {
+    enable = true;
+    opencode = {
+      tui = {
+        mouse = true;
+        theme = "nord";
+        attention = {
+          enabled = true;
+          notifications = true;
+        };
+        keybinds = {
+          leader = "ctrl+x";
+          "command_list" = "<leader><leader>";
+        };
+      };
+      settings = {
+        autoupdate = false;
+        provider = {
+          ollama = {
+            npm = "@ai-sdk/openai-compatible";
+            name = "Ollama (marpa)";
+            options.baseURL = "http://marpa:11434/v1";
+          };
+          models = {
+            "qwen3.5:9b".name = "Qwen 3.5 Medium";
+            "gemma4:e4b".name = "Gemma E4B";
+            "qwen2.5-coder:1.5b-base".name = "Qwen 2.5 Coder Light";
+          };
+        };
+        permission = {
+          "*" = "ask";
+          read = {
+            "*" = "allow";
+            "*.env" = "deny";
+            "*.env.*" = "deny";
+            "*.env.example" = "allow";
+          };
+        };
+        formatter.nixfmt = {
+          command = ["nix" "fmt" "$FILE"];
+          extensions = [".nix"];
+        };
+      };
+      web = {
+        enable = true;
+        cors = config.sops.secrets."opencode/cors".path;
+        mdns.enable = true;
+      };
+    };
+  };
+}

users/phundrak/home.nix

@@ -5,6 +5,7 @@
   ...
 }: {
   imports = [
+    ./ai.nix
     ./light-home.nix
     ./packages.nix
     ./email.nix
@@ -56,6 +57,7 @@
       emailPassword = {};
       "mopidy/bandcamp" = {};
       "mopidy/spotify" = {};
+      "opencode/cors" = {};
     };
 
     home = {
@@ -86,7 +88,6 @@
         };
       };
       dev = {
-        ai.claude.enable = true;
         editors.emacs.package = emacsPackage;
         vcs.jj.signing.enable = true;
       };