lsp/presets/clangd: init

modules/plugins/lsp/presets/clangd.nix

@@ -0,0 +1,107 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  inherit (lib.meta) getExe';
+  inherit (lib.modules) mkIf;
+  inherit (lib.options) mkEnableOption;
+  inherit (lib.generators) mkLuaInline;
+
+  cfg = config.vim.lsp.presets.clangd;
+in {
+  options.vim.lsp.presets.clangd = {
+    enable = mkEnableOption "the Clangd Language Server";
+  };
+
+  config = mkIf cfg.enable {
+    vim.lsp.servers.clangd = {
+      enable = true;
+      cmd = [(getExe' pkgs.clang-tools "clangd")];
+      root_markers = [
+        ".git"
+        ".clangd"
+        ".clang-tidy"
+        ".clang-format"
+        "compile_commands.json"
+        "compile_flags.txt"
+        "configure.ac"
+      ];
+      capabilities = {
+        textDocument = {
+          completion = {
+            editsNearCursor = true;
+          };
+        };
+        offsetEncoding = ["utf-8" "utf-16"];
+      };
+      on_attach = mkLuaInline ''
+        function(client, bufnr)
+          local function switch_source_header(bufnr)
+            local method_name = "textDocument/switchSourceHeader"
+            local client = vim.lsp.get_clients({ bufnr = bufnr, name = "clangd", })[1]
+            if not client then
+              return vim.notify(('method %s is not supported by any servers active on the current buffer'):format(method_name))
+            end
+            local params = vim.lsp.util.make_text_document_params(bufnr)
+            client.request(method_name, params, function(err, result)
+              if err then
+                error(tostring(err))
+              end
+              if not result then
+                vim.notify('corresponding file cannot be determined')
+                return
+              end
+              vim.cmd.edit(vim.uri_to_fname(result))
+            end, bufnr)
+          end
+
+          local function symbol_info()
+            local bufnr = vim.api.nvim_get_current_buf()
+            local clangd_client = vim.lsp.get_clients({ bufnr = bufnr, name = "clangd" })[1]
+            if not clangd_client or not clangd_client:supports_method 'textDocument/symbolInfo' then
+              return vim.notify('Clangd client not found', vim.log.levels.ERROR)
+            end
+            local win = vim.api.nvim_get_current_win()
+            local params = vim.lsp.util.make_position_params(win, clangd_client.offset_encoding)
+            clangd_client:request('textDocument/symbolInfo', params, function(err, res)
+              if err or #res == 0 then
+                -- Clangd always returns an error, there is not reason to parse it
+                return
+              end
+              local container = string.format('container: %s', res[1].containerName) ---@type string
+              local name = string.format('name: %s', res[1].name) ---@type string
+              vim.lsp.util.open_floating_preview({ name, container }, "", {
+                height = 2,
+                width = math.max(string.len(name), string.len(container)),
+                focusable = false,
+                focus = false,
+                border = 'single',
+                title = 'Symbol Info',
+              })
+            end, bufnr)
+          end
+
+          vim.api.nvim_buf_create_user_command(
+            bufnr,
+            "ClangdSwitchSourceHeader",
+            function(arg)
+              switch_source_header(0)
+            end,
+            {desc = "Switch between source/header"}
+          )
+
+          vim.api.nvim_buf_create_user_command(
+            bufnr,
+            "ClangdShowSymbolInfo",
+            function(arg)
+              symbol_info()
+            end,
+            {desc = "Show symbol info"}
+          )
+        end
+      '';
+    };
+  };
+}

modules/plugins/lsp/presets/default.nix

@@ -6,6 +6,7 @@
     ./basedpyright.nix
     ./bash-language-server.nix
     ./ccls.nix
+    ./clangd.nix
     ./clojure-lsp.nix
     ./cue.nix
     ./dart.nix