languages/yaml: Init (#676)

docs/release-notes/rl-0.8.md

@@ -192,3 +192,7 @@
 - Add formatters for go: [gofmt](https://go.dev/blog/gofmt),
   [golines](https://github.com/segmentio/golines) and
   [gofumpt](https://github.com/mvdan/gofumpt)
+
+[MaxMur](https://github.com/TheMaxMur)
+
+- Add YAML support under `vim.languages.yaml`.

modules/plugins/languages/default.nix

@@ -39,6 +39,7 @@ in {
     ./nu.nix
     ./odin.nix
     ./wgsl.nix
+    ./yaml.nix
     ./ruby.nix
   ];
 

modules/plugins/languages/yaml.nix

@@ -0,0 +1,72 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}: let
+  inherit (builtins) attrNames;
+  inherit (lib.options) mkEnableOption mkOption;
+  inherit (lib.modules) mkIf mkMerge;
+  inherit (lib.lists) isList;
+  inherit (lib.types) enum either listOf package str;
+  inherit (lib.nvim.types) mkGrammarOption;
+  inherit (lib.nvim.lua) expToLua;
+
+  cfg = config.vim.languages.yaml;
+
+  defaultServer = "yaml-language-server";
+  servers = {
+    yaml-language-server = {
+      package = pkgs.nodePackages.yaml-language-server;
+      lspConfig = ''
+        lspconfig.yamlls.setup {
+          capabilities = capabilities;
+          on_attach = default_on_attach;
+          cmd = ${
+          if isList cfg.lsp.package
+          then expToLua cfg.lsp.package
+          else ''{"${cfg.lsp.package}/bin/yaml-language-server", "--stdio"}''
+        },
+        }
+      '';
+    };
+  };
+in {
+  options.vim.languages.yaml = {
+    enable = mkEnableOption "YAML language support";
+
+    treesitter = {
+      enable = mkEnableOption "YAML treesitter";
+
+      package = mkGrammarOption pkgs "yaml";
+    };
+
+    lsp = {
+      enable = mkEnableOption "YAML LSP support";
+
+      server = mkOption {
+        type = enum (attrNames servers);
+        default = defaultServer;
+        description = "YAML LSP server to use";
+      };
+
+      package = mkOption {
+        type = either package (listOf str);
+        default = servers.${cfg.lsp.server}.package;
+        description = "YAML LSP server package";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    (mkIf cfg.treesitter.enable {
+      vim.treesitter.enable = true;
+      vim.treesitter.grammars = [cfg.treesitter.package];
+    })
+
+    (mkIf cfg.lsp.enable {
+      vim.lsp.lspconfig.enable = true;
+      vim.lsp.lspconfig.sources.yaml-lsp = servers.${cfg.lsp.server}.lspConfig;
+    })
+  ]);
+}