Add suport for nvim's LSP

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

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+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

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+-- 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

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+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

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