Add suport for nvim's LSP

home/.config/nvim/lua/lsp/autoformat.lua

@@ -0,0 +1,5 @@
+local vim = require("vim")
+local cmd = vim.cmd
+
+-- Always automatically format on write for given filenames
+cmd[[autocmd BufWritePre *.js lua vim.lsp.buf.formatting_sync(nil, 100)]]

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

@@ -0,0 +1,31 @@
+-- Neovim has built in support for the language server protocol (LSP). For
+-- which reason I decided to utilize it directly instead of relying on plugins
+-- such as COC, which reimplement it completely just to support default vim
+-- too, since I don't need pure vim support, utilizing this built in support
+-- makes a lot more sense and will be faster.
+--
+-- By default, setting up LSP doesn't technically require any plugins, however
+-- I still do use the recommended neovim/nvim-lspconfig plugin, along with
+-- williamboman/nvim-lsp-installer, because it makes things a lot easier to get
+-- working. The lspconfig holds the default configurations for the individual
+-- language servers, avoiding the need of tediously configuring them manually,
+-- and the lspinstaller gives us a way to automatically install selected
+-- language servers locally for nvim only, which means we won't need to look at
+-- the install instructions for each language server and install it user or
+-- system wide.
+--
+-- However, since this configuration shouldn't be plugin dependant, as it is
+-- outside of the plugins/ directory and LSP is supported by neovim directly,
+-- this folder is here to provide the non-plugin dependant LSP configuration,
+-- but I do not manually define the configuration for each language server,
+-- since I do actually utilize those plugins, but sturcturing like this still
+-- does give space for completely custom configurations written from scratch
+-- without relying on any external plugins at all. If you do want to do that,
+-- this would be the place to set this up.
+--
+-- NOTE: With my current configuration, this file is only ran by being required
+-- in the lsp plugin config file, if you don't wish to run with plugins, you'll
+-- want to require this file from init.lua directly.
+
+require("lsp.keymaps")
+require("lsp.autoformat")

home/.config/nvim/lua/lsp/keymaps.lua

@@ -0,0 +1,57 @@
+local m = require("utility.mappings")
+
+-- See `:help vim.lsp.*` for documentation on any of the below mapped functions
+
+-- Check if certain plugins are installed, if so, they should be used
+-- to define some mappings
+local telescope_installed, _ = pcall(require, "telescope")
+local lsp_signature_installed, _ = pcall(require, "lsp_signature")
+
+-- Lookups
+m.keymap("n", "gd", "<cmd>lua vim.lsp.buf.definition()<CR>")
+m.keymap('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<cr>')
+m.keymap("n", "gr", "<cmd>lua vim.lsp.buf.references()<CR>")
+m.keymap("n", "gi", "<cmd>lua vim.lsp.buf.implementation()<CR>")
+m.keymap("n", "gt", "<cmd>lua vim.lsp.buf.type_definition()<CR>")
+
+if telescope_installed then
+    m.keymap('n', 'gd', '<cmd>lua require("telescope.builtin").lsp_definitions()<cr>')
+    m.keymap('n', 'gr', '<cmd>lua require("telescope.builtin").lsp_references()<cr>')
+    m.keymap('n', 'gi', '<cmd>lua require("telescope.builtin").lsp_implementations()<cr>')
+    m.keymap('n', 'gt', '<cmd>lua require("telescope.builtin").lsp_type_definitions()<cr>')
+end
+
+-- Formatting
+m.keymap('n', '<leader>gf', '<cmd>lua vim.lsp.buf.formatting()<cr>')
+m.keymap('v', '<leader>gf', '<cmd>lua vim.lsp.buf.range_formatting()<cr>')
+
+-- Hover info
+m.keymap("n", "<C-k>", "<cmd>lua vim.lsp.buf.signature_help()<CR>")
+m.keymap("n", "M", "<cmd>lua vim.lsp.buf.hover()<CR>")
+
+if lsp_signature_installed then
+    m.keymap('n', '<C-M>', '<cmd>lua require("lsp_signature").signature()<cr>')
+end
+
+-- Diagnostics
+m.keymap('n', '[g', '<cmd>lua vim.diagnostic.goto_prev()<cr>')
+m.keymap('n', ']g', '<cmd>lua vim.diagnostic.goto_next()<cr>')
+m.keymap('n', 'ge', '<cmd>lua vim.diagnostic.open_float(nil, { scope = "line", })<cr>')
+
+if telescope_installed then
+    m.keymap('n', '<leader>ge', '<cmd>lua require("telescope.builtin").lsp_document_diagnostics()<cr>')
+end
+
+-- LSP Workspace
+m.keymap('n', '<leader>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<cr>')
+m.keymap('n', '<leader>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<cr>')
+m.keymap('n', '<leader>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<cr>')
+
+--Actions
+if telescope_installed then
+    m.keymap('n', '<leader>ga', '<cmd>lua require("telescope.builtin").lsp_code_actions()<cr>')
+    m.keymap('v', '<leader>ga', '<cmd>lua require("telescope.builtin").lsp_range_code_actions()<cr>')
+end
+
+-- Use custom implementation for renaming all references
+m.keymap('n', 'gn', '<cmd>lua require("lsp/rename").rename()<cr>')

home/.config/nvim/lua/lsp/rename.lua

@@ -0,0 +1,3 @@
+-- Nvim's LSP lacks rename-all functionality which plugins like Coc provide
+-- this is a manual implementation of this feature
+-- TODO: Actually implement this

home/.config/nvim/lua/plugins/plugin_list.lua

@@ -62,11 +62,11 @@ local plugin_list = {
         config = get_plugin_file("firenvim.lua"),
         run = function() vim.fn['firenvim#install'](0) end
     },
-    -- {
-    --     "neovim/nvim-lspconfig",
-    --     "williamboman/nvim-lsp-installer",
-    --     config = get_plugin_file("lspconfig.lua")
-    -- },
+    {
+        "williamboman/nvim-lsp-installer",
+        config = get_plugin_file("lsp.lua"),
+        requires = { "neovim/nvim-lspconfig" },
+    },
     --{
     --    "nvim-telescope/telescope.nvim",
     --    --config = get_plugin_file("telescope.lua")
@@ -77,12 +77,12 @@ local plugin_list = {
     --        { "nvim-lua/plenary.nvim" },
     --    }
     --},
-    {
-        "neoclide/coc.nvim",
-        branch = "release",
-        config = get_plugin_file("coc.vim"),
-        requires = { "antoinemadec/coc-fzf", opt = true },
-    },
+    -- {
+    --     "neoclide/coc.nvim",
+    --     branch = "release",
+    --     config = get_plugin_file("coc.vim"),
+    --     requires = { "antoinemadec/coc-fzf", opt = true },
+    -- },
 }
 
 return plugin_list

home/.config/nvim/lua/plugins/settings/lsp.lua

@@ -0,0 +1,73 @@
+local vim = require("vim")
+local fn = vim.fn
+
+-- Load in our default plugin independant LSP settings.
+-- These are loaded from here, because we don't need them if we aren't using
+-- these plugins, which actually load in the LSP configurations and install the
+-- individual language servers. However it is possible to configure nvim
+-- without these plugins and so this config is separated from the plugin
+-- config. for more info, check the comments in lsp/init.lua
+require("lsp")
+
+
+-- Load in the needed settigns for nvim-lsp-installer plugin.
+-- This ensures automatic installation for the individual language servers.
+local lsp_installer = require("nvim-lsp-installer")
+
+-- Define some settings for the UI and installation path for the language
+-- servers.
+lsp_installer.settings({
+    ui = {
+        icons = {
+            server_installed = "✓",
+            server_pending = "➜",
+            server_uninstalled = "✗"
+        },
+        keymaps = {
+            toggle_server_expand = "<CR>",
+            install_server = "i",
+            update_server = "u",
+            uninstall_server = "X",
+        },
+    },
+    install_root_dir = fn.stdpath("data") ..  "/lsp_servers",
+})
+
+-- Define a table of requested language servers which should be automatically
+-- installed.
+--
+-- NOTE: pylsp requires external installaion with
+-- :PylspInstall pyls-flake8 pyls-mypy pyls-isort
+local requested_servers = {
+    "clangd", "cmake", "omnisharp",
+    "cssls", "dockerls", "gopls", "html",
+    "hls", "jsonls", "jdtls", "tsserver",
+    "sumneko_lua", "pyright", "pylsp",
+    "sqlls", "vimls", "yamlls"
+}
+
+-- Go through the requested servers and ensure installation
+-- Once the servers are ready, run setup() on them. This setup is basically
+-- running the lspconfig.server.setup() which means lspconfig is needed to do
+-- this.
+local lsp_installer_servers = require('nvim-lsp-installer.servers')
+for _, requested_server in pairs(requested_servers) do
+    local server_available, server = lsp_installer_servers.get_server(requested_server)
+    if server_available then
+        -- Setup the server once it will become ready
+        server:on_ready(function()
+            local opts = {}
+            server:setup(opts)
+        end)
+        -- If the server isn't yet installed, schedule the installation
+        if not server:is_installed() then
+            server:install()
+        end
+    else
+        vim.notify(
+            "Can't install: Language server " .. server .. " was not found - SKIPPED",
+            vim.log.levels.WARN,
+            { title = "Notification" }
+        )
+    end
+end