Merge pull request #33 from definfo/master

doc: add installation guide for NixOS

README.md

@@ -54,6 +54,44 @@ https://user-images.githubusercontent.com/14821247/213079440-f0ab2ddd-5e44-4e41-
 
 手动从源码编译与上面类似，其他 linux 发行版也差不多
 
+### NixOS
+
+可以参考 NUR 打包 [nur.repos.definfo.rime-ls](https://github.com/nix-community/nur-combined/blob/master/repos/definfo/pkgs/rime-ls/default.nix)
+
+使用 home-manager 管理配置时，应将 `shared_data_dir` 路径替换为 `${pkgs.nur.repos.definfo.rime-ls}/share/rime-data`
+
+以 Helix 为例:
+
+```nix
+  programs.helix = {
+    languages = {
+      language-server.rime-ls = {
+        command = "${pkgs.nur.repos.definfo.rime-ls}/bin/rime_ls";
+        config.shared_data_dir = "${pkgs.nur.repos.definfo.rime-ls}/share/rime-data";
+        config.user_data_dir = "${config.home.homeDirectory}/.local/share/rime-ls";
+        config.log_dir = "${config.home.homeDirectory}/.local/share/rime-ls";
+        config.max_candidates = 9;
+        config.trigger_characters = [ ];
+        config.schema_trigger_character = "&";
+        config.max_tokens = 4;
+        config.always_incomplete = true;
+        config.long_filter_text = true;
+      };
+      language = [
+        {
+          name = "markdown";
+          scope = "source.markdown";
+          file-types = [
+            "md"
+            "markdown"
+          ];
+          language-servers = [ "rime-ls" ];
+        }
+      ];
+    };
+  };
+```
+
 ### Windows
 
 1. 配置 Rust 环境, 安装额外依赖 `clang` 和 `librime`