[nvim] feat: configure LSPs through lsp-installer

!!!BREAK: do not use lsp-config (used under the hood by
nvim-lsp-installer)

.config/nvim/lua/lsp/c.lua

@@ -1,20 +0,0 @@
--- Author        : swytch
--- Created       : Tuesday May 18, 2021 12:08:51 CET
--- License       : GPLv3
--- Description   : clangd config file for lsp
-
--- The nvim-cmp almost supports LSP's capabilities so You should advertise it to LSP servers..
-local capabilities = vim.lsp.protocol.make_client_capabilities()
-capabilities = require('cmp_nvim_lsp').update_capabilities(capabilities)
-
-
-require("lspconfig").clangd.setup {
-        cmd = { "clangd",
-                "--background-index",
-                "--suggest-missing-includes",
-                "--clang-tidy",
-                "--header-insertion=iwyu"
-        },
-        -- The following example advertise capabilities to `clangd`.
-        capabilities = capabilities,
-}

.config/nvim/lua/lsp/init.lua

@@ -66,15 +66,12 @@ M.icons = {
         Variable        = "   ",
 }
 
+
 function M.setup()
         local kinds = vim.lsp.protocol.CompletionItemKind
         for i, kind in ipairs(kinds) do
                 kinds[i] = M.icons[kind] or kind
         end
-
-        local ft = vim.bo.filetype
-        if ft == "cpp" then ft = "c" end
-        require("lsp." .. ft)                           -- ./<ft>.lua
 end
 
 return M

.config/nvim/lua/lsp/lua.lua

@@ -1,40 +0,0 @@
--- Author        : swytch
--- Created       : Tuesday May 18, 2021 12:08:51 CET
--- License       : GPLv3
--- Description   : sumneko (lua) config file for lsp
-
-
--- set the path to the sumneko installation; if you previously installed via the now deprecated :LspInstall, use
-local sumneko_root_path = vim.fn.stdpath("data") ..
-        "/lsp_servers/sumneko_lua/extension/server"
-local sumneko_binary = sumneko_root_path .. "/bin/" .. "/lua-language-server"
-
-local runtime_path = vim.split(package.path, ';')
-table.insert(runtime_path, "lua/?.lua")
-table.insert(runtime_path, "lua/?/init.lua")
-
-require'lspconfig'.sumneko_lua.setup {
-        cmd = {sumneko_binary, "-E", sumneko_root_path .. "/main.lua"};
-        settings = {
-                Lua = {
-                        runtime = {
-                        -- Tell the language server which version of Lua you're using (most likely LuaJIT in the case of Neovim)
-                                version = 'LuaJIT',
-                                -- Setup your lua path
-                                path = runtime_path,
-                        },
-                        diagnostics = {
-                                -- Get the language server to recognize the `vim` global
-                                globals = {"vim", "use", "globals", "utils"},
-                        },
-                        workspace = {
-                                -- Make the server aware of Neovim runtime files
-                                library = vim.api.nvim_get_runtime_file("", true),
-                        },
-                        -- Do not send telemetry data containing a randomized but unique identifier
-                        telemetry = {
-                                enable = false,
-                        },
-                },
-        },
-}

.config/nvim/lua/lsp/python.lua

@@ -1,8 +0,0 @@
--- Author        : swytch
--- Created       : Tuesday May 18, 2021 15:03:43 CET
--- License       : GPLv3
--- Description   : jedi (python) config file for lsp
-
-require("lspconfig").jedi_language_server.setup{
-    cmd = { vim.fn.stdpath("data") .. "/lsp_servers/jedi_language_server/venv/bin/jedi-language-server" }
-}

.config/nvim/lua/lsp/tex.lua

@@ -1,13 +0,0 @@
--- Author        : swytch
--- Created       : Saturday May 23, 2021 10:34:53 CET
--- License       : GPLv3
--- Description   : LaTeX config file for lsp
-
-require("lspconfig").texlab.setup {
-        cmd = { vim.fn.stdpath("data") .. "/lsp_servers/latex/texlab" },
-        settings = {
-                build = {
-                        executable = "pdflatex"
-                }
-        }
-}

.config/nvim/lua/plugin/lsp_installer.lua

@@ -9,20 +9,18 @@ lsp_installer.settings {
     ui = {
         icons = {
             server_installed = "✓",
-            server_pending = "➜",
+            server_pending = "o",
-            server_uninstalled = "✗"
+            server_uninstalled = "x"
         }
     }
 }
 
 local servers = {
-	"bashls",
+        "clangd",
-        "jedi_language_server",
-	"texlab",
 	"sumneko_lua",
 }
 
-for _, name in pairs(servers) do
+for _, name in ipairs(servers) do
 	local ok, server = lsp_installer.get_server(name)
 	-- Check that the server is supported in nvim-lsp-installer
 	if ok then
@@ -33,15 +31,95 @@ for _, name in pairs(servers) do
 	end
 end
 
+local lsp_root_path = vim.fn.stdpath("data") .. "/lsp_servers/"
+local runtime_path = vim.split(package.path, ';')
+
+
+local clangd_binary = lsp_root_path .. "clangd/clangd/bin/clangd"
+
+table.insert(runtime_path, "lua/?.lua")
+table.insert(runtime_path, "lua/?/init.lua")
+
+local enhance_server_opts = {
+        ["clangd"] = function(opts)
+                opts.settings = {
+                        cmd = { clangd_binary,
+                                "--background-index",
+                                "--suggest-missing-includes",
+                                "--clang-tidy",
+                                "--header-insertion=iwyu"
+                        },
+                }
+        end,
+        ["sumneko_lua"] = function(opts)
+                opts.settings = {
+                        Lua = {
+                                runtime = {
+                                -- Tell the language server which version of Lua you're using (most likely LuaJIT in the case of Neovim)
+                                        version = 'LuaJIT',
+                                        -- Setup your lua path
+                                        path = runtime_path,
+                                },
+                                diagnostics = {
+                                        -- Get the language server to recognize the `vim` global
+                                        globals = {
+                                                "vim",
+                                                "globals",
+                                                "utils"
+                                        },
+                                },
+                                workspace = {
+                                        -- Make the server aware of Neovim runtime files
+                                        library =
+                                                vim.api.nvim_get_runtime_file("", true),
+                                },
+                                -- Do not send telemetry data containing a randomized but unique identifier
+                                telemetry = {
+                                        enable = false,
+                                },
+                        },
+                }
+        end,
+}
+
+local on_attach = function(_, bufnr)
+        local opts = { buffer = bufnr }
+        vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, opts)
+        vim.keymap.set('n', 'gd', vim.lsp.buf.definition, opts)
+        vim.keymap.set('n', 'K', vim.lsp.buf.hover, opts)
+        vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, opts)
+        vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, opts)
+        vim.keymap.set('n', '<leader>wa',
+                vim.lsp.buf.add_workspace_folder, opts)
+        vim.keymap.set('n', '<leader>wr',
+                vim.lsp.buf.remove_workspace_folder, opts)
+        vim.keymap.set('n', '<leader>wl', function()
+                vim.inspect(vim.lsp.buf.list_workspace_folders())
+        end, opts)
+        vim.keymap.set('n', '<leader>D', vim.lsp.buf.type_definition, opts)
+        vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, opts)
+        vim.keymap.set('n', 'gr', vim.lsp.buf.references, opts)
+        vim.keymap.set('n', '<leader>ca', vim.lsp.buf.code_action, opts)
+        vim.keymap.set('n', '<leader>so',
+                require('telescope.builtin').lsp_document_symbols, opts)
+        vim.api.nvim_create_user_command("Format", vim.lsp.buf.formatting, {})
+end
+
+-- nvim-cmp supports additional completion capabilities
+local capabilities = vim.lsp.protocol.make_client_capabilities()
+capabilities = require("cmp_nvim_lsp").update_capabilities(capabilities)
+
 lsp_installer.on_server_ready(function(server)
-    local opts = {}
+  -- Specify the default options which we'll use to setup all servers
+        local opts = {
+                on_attach = on_attach,
+                capabilities = capabilities,
+        }
 
-    -- (optional) Customize the options passed to the server
+        if enhance_server_opts[server.name] then
-    -- if server.name == "tsserver" then
+                -- Enhance the default opts with the server-specific ones
-    --     opts.root_dir = function() ... end
+                enhance_server_opts[server.name](opts)
-    -- end
+        end
 
-    -- This setup() function is exactly the same as lspconfig's setup function (:help lspconfig-quickstart)
+        server:setup(opts)
-    server:setup(opts)
-    vim.cmd [[ do User LspAttachBuffers ]]
 end)

.config/nvim/lua/plugin/packer.lua

@@ -54,17 +54,11 @@ return require("packer").startup(function()
         -- LSP
         use {
                 "williamboman/nvim-lsp-installer",
-                cmd = {
+                requires = {
-                        "LspInstall",
+                        "neovim/nvim-lspconfig",
-                        "LspInstallInfo"
+                        config = function() require("lsp").setup() end
                 },
-                config = function() require("plugin.lsp_installer").setup() end
+                config = function() require("plugin.lsp_installer") end
-        }
-
-        use {
-                "neovim/nvim-lspconfig",
-                ft = { "c", "cpp", "lua", "python", "tex"},
-                config = function() require("lsp").setup() end
         }
 
         -- auto completion