From d0c58a5c9dbce61da21e48d76392da432083de18 Mon Sep 17 00:00:00 2001
From: Harald Hoyer <harald@hoyer.xyz>
Date: Thu, 21 May 2026 22:02:53 +0200
Subject: [PATCH] feat(opencode): configure formatters and provide them on PATH

Add formatter entries for nix, prettier (md/yaml/json/web), shell,
python, toml and lua, and install the matching tools via the opencode
home module so they are available wherever opencode runs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 config/opencode/config.json                | 26 ++++++++++++++++++++++
 modules/home/cli-apps/opencode/default.nix | 11 +++++++++
 2 files changed, 37 insertions(+)

diff --git a/config/opencode/config.json b/config/opencode/config.json
index c854526..dad56b3 100644
--- a/config/opencode/config.json
+++ b/config/opencode/config.json
@@ -1,6 +1,32 @@
 {
   "$schema": "https://opencode.ai/config.json",
   "lsp": true,
+  "formatter": {
+    "nixfmt": {
+      "command": ["nixfmt", "$FILE"],
+      "extensions": [".nix"]
+    },
+    "prettier": {
+      "command": ["prettier", "--write", "$FILE"],
+      "extensions": [".md", ".yaml", ".yml", ".json", ".css", ".html", ".js", ".ts", ".jsx", ".tsx"]
+    },
+    "shfmt": {
+      "command": ["shfmt", "-w", "$FILE"],
+      "extensions": [".sh", ".bash"]
+    },
+    "ruff": {
+      "command": ["ruff", "format", "$FILE"],
+      "extensions": [".py"]
+    },
+    "taplo": {
+      "command": ["taplo", "format", "$FILE"],
+      "extensions": [".toml"]
+    },
+    "stylua": {
+      "command": ["stylua", "$FILE"],
+      "extensions": [".lua"]
+    }
+  },
   "disabled_providers": ["opencode"],
   "provider": {
     "halo": {
diff --git a/modules/home/cli-apps/opencode/default.nix b/modules/home/cli-apps/opencode/default.nix
index f1ca10b..f2b54c7 100644
--- a/modules/home/cli-apps/opencode/default.nix
+++ b/modules/home/cli-apps/opencode/default.nix
@@ -1,6 +1,7 @@
 {
   lib,
   config,
+  pkgs,
   inputs,
   ...
 }:
@@ -29,6 +30,16 @@ in
   };
 
   config = mkIf cfg.enable {
+    # Formatters referenced by config/opencode/config.json; keep them on PATH for opencode.
+    home.packages = [
+      pkgs.nixfmt-rfc-style
+      pkgs.nodePackages.prettier
+      pkgs.shfmt
+      pkgs.ruff
+      pkgs.taplo
+      pkgs.stylua
+    ];
+
     xdg.configFile."opencode" = {
       source = ../../../../config/opencode;
       recursive = true;