From 4e487434da3882417ff54c8579520987b9256c1a Mon Sep 17 00:00:00 2001
From: poz <poz@poz.pet>
Date: Wed, 18 Feb 2026 11:48:39 +0100
Subject: [PATCH] languages/cmake: init

---
 configuration.nix                     |  1 +
 docs/manual/release-notes/rl-0.9.md   |  6 ++
 modules/plugins/languages/cmake.nix   | 96 +++++++++++++++++++++++++++
 modules/plugins/languages/default.nix |  1 +
 4 files changed, 104 insertions(+)
 create mode 100644 modules/plugins/languages/cmake.nix

diff --git a/configuration.nix b/configuration.nix
index 13d3cf5d..fd006949 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -55,6 +55,7 @@ isMaximal: {
       # Languages that are enabled in the maximal configuration.
       bash.enable = isMaximal;
       clang.enable = isMaximal;
+      cmake.enable = isMaximal;
       css.enable = isMaximal;
       html.enable = isMaximal;
       json.enable = isMaximal;
diff --git a/docs/manual/release-notes/rl-0.9.md b/docs/manual/release-notes/rl-0.9.md
index 47ce7cd6..83296c2b 100644
--- a/docs/manual/release-notes/rl-0.9.md
+++ b/docs/manual/release-notes/rl-0.9.md
@@ -241,4 +241,10 @@ https://github.com/gorbit99/codewindow.nvim
 
 - Ignore terminals by default in spell-checking
 
+[poz](https://poz.pet):
+
+[neocmakelsp]: https://github.com/neocmakelsp/neocmakelsp
+
+- Add CMake support with [neocmakelsp].
+
 <!-- vim: set textwidth=80: -->
diff --git a/modules/plugins/languages/cmake.nix b/modules/plugins/languages/cmake.nix
new file mode 100644
index 00000000..6c6fa287
--- /dev/null
+++ b/modules/plugins/languages/cmake.nix
@@ -0,0 +1,96 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  inherit (builtins) attrNames;
+  inherit (lib.options) mkEnableOption mkOption;
+  inherit (lib.modules) mkIf mkMerge;
+  inherit (lib.meta) getExe;
+  inherit (lib.types) enum listOf package;
+  inherit (lib.nvim.attrsets) mapListToAttrs;
+  inherit (lib.nvim.types) mkGrammarOption;
+
+  cfg = config.vim.languages.cmake;
+
+  defaultServers = ["neocmakelsp"];
+  servers = {
+    neocmakelsp = {
+      enable = true;
+      cmd = [(getExe pkgs.neocmakelsp) "--stdio"];
+      filetypes = ["cmake"];
+      root_markers = [".gersemirc" ".git" "build" "cmake"];
+      capabilities = {
+        textDocument.completion.completionItem.snippetSupport = true;
+      };
+    };
+  };
+
+  defaultFormat = "gersemi";
+  formats = {
+    gersemi = {
+      package = pkgs.gersemi;
+    };
+  };
+in {
+  options.vim.languages.cmake = {
+    enable = mkEnableOption "CMake language support";
+
+    treesitter = {
+      enable = mkEnableOption "CMake treesitter" // {default = config.vim.languages.enableTreesitter;};
+      package = mkGrammarOption pkgs "cmake";
+    };
+
+    lsp = {
+      enable = mkEnableOption "CMake LSP support" // {default = config.vim.lsp.enable;};
+      servers = mkOption {
+        type = listOf (enum (attrNames servers));
+        default = defaultServers;
+        description = "CMake LSP servers to use";
+      };
+    };
+
+    format = {
+      enable = mkEnableOption "CMake formatting" // {default = config.vim.languages.enableFormat;};
+
+      type = mkOption {
+        description = "CMake formatter to use";
+        type = enum (attrNames formats);
+        default = defaultFormat;
+      };
+
+      package = mkOption {
+        description = "CMake formatter package";
+        type = package;
+        default = formats.${cfg.format.type}.package;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    (mkIf cfg.treesitter.enable {
+      vim.treesitter.enable = true;
+      vim.treesitter.grammars = [cfg.treesitter.package];
+    })
+
+    (mkIf cfg.lsp.enable {
+      vim.lsp.servers =
+        mapListToAttrs (n: {
+          name = n;
+          value = servers.${n};
+        })
+        cfg.lsp.servers;
+    })
+
+    (mkIf cfg.format.enable {
+      vim.formatter.conform-nvim = {
+        enable = true;
+        setupOpts.formatters_by_ft.cmake = [cfg.format.type];
+        setupOpts.formatters.${cfg.format.type} = {
+          command = getExe cfg.format.package;
+        };
+      };
+    })
+  ]);
+}
diff --git a/modules/plugins/languages/default.nix b/modules/plugins/languages/default.nix
index 0986e1e1..fe608513 100644
--- a/modules/plugins/languages/default.nix
+++ b/modules/plugins/languages/default.nix
@@ -10,6 +10,7 @@ in {
     ./dart.nix
     ./clang.nix
     ./clojure.nix
+    ./cmake.nix
     ./css.nix
     ./elixir.nix
     ./fsharp.nix