Add clangd support

README.md

@@ -25,14 +25,17 @@ Here is a list of all external depencies you'll need:
 
 - universal ctags, ctags won't work (note that arch's universal ctags package is named ctags...), for tagbar
 - tree-sitter, for syntax coloration
-- rust-analyzer, as LSP server
+- rust-analyzer and clangd as LSP servers
 
 On arch, you can just use the following command :
 ```
-pacman -Syu ctags tree-sitter rust-analyzer
+pacman -Syu ctags tree-sitter rust-analyzer clangd
 ```
 
 Once the dependencies are installed, type `:checkhealth` to verify that everything is properly detected. You should, at most, see a warning about node and another about the clipboard.
+For clangd to work properly, create a compile_flags.txt file at the root of the project and fill it
+with the flags used for compilation (one per line). Cpu-specific flags may cause the analysis to
+fail and should be ignored (e.g. mcpu, mthumb, ...)
 
 ### Syntax coloration
 

lua/plugins.lua

@@ -9,6 +9,29 @@ local feedkey = function(key, mode)
   vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes(key, true, true, true), mode, true)
 end
 
+-- LSP keybindings
+local lsp_on_attach = function(_, bufnr)
+	local nmap = function(keys, func, desc)
+		if desc then
+			desc = 'LSP: ' .. desc
+		end
+
+		vim.keymap.set('n', keys, func, { buffer = bufnr, desc = desc })
+	end
+
+	-- Define standard LSP shortcuts
+	nmap('<leader>rn', vim.lsp.buf.rename, '[R]e[n]ame')
+	nmap('<leader>ca', vim.lsp.buf.code_action, '[C]ode [A]ction')
+	nmap('gd', vim.lsp.buf.definition, '[G]oto [d]efinition')
+	nmap('gD', vim.lsp.buf.declaration, '[G]oto [D]eclaration')
+	-- See `:help K` for why this keymap
+	nmap('K', vim.lsp.buf.hover, 'Hover Documentation')
+
+	-- Create a command `:Format` local to the LSP buffer
+	vim.api.nvim_buf_create_user_command(bufnr, 'Format',
+		vim.lsp.buf.format or vim.lsp.buf.formatting, { desc = 'Format current buffer with LSP' })
+end
+
 -- plugins definition
 local function manage_plugins()
 
@@ -159,30 +182,22 @@ local function manage_plugins()
         },
 
         -- LSP configuration
-        ["https://github.com/neovim/nvim-lspconfig.git"] = {},
-        ["https://github.com/simrat39/rust-tools.nvim.git"] = {
+        ["https://github.com/neovim/nvim-lspconfig.git"] = {
 			packadd_after = {
-                ["https://github.com/neovim/nvim-lspconfig.git"] = true,
                 ["https://github.com/hrsh7th/nvim-cmp.git"] = true,
 			},
 			packadd_hook = function()
-                local rt = require("rust-tools")
 				local capabilities =  require("cmp_nvim_lsp").default_capabilities()
+				local lsp_config = require("lspconfig")
+				local servers = { "clangd", "rust_analyzer" }
 
-                rt.setup({
-                    server = {
+				for _, lsp in ipairs(servers) do
+					lsp_config[lsp].setup {
 						capabilities = capabilities,
-                        on_attach = function(_, bufnr)
-                            -- Hover actions
-                            vim.keymap.set("n", "<C-space>",
-                            rt.hover_actions.hover_actions, { buffer = bufnr })
-                            ---- Code action groups
-                            vim.keymap.set("n", "<Leader>a",
-                            rt.code_action_group.code_action_group, { buffer = bufnr })
-                        end,
-                    },
-                })
+						on_attach = lsp_on_attach,
+					}
 				end
+			end,
 		},
 
         -- LSP alternative
@@ -273,3 +288,4 @@ else
     manage_plugins()
 end
 
+