feat: add lsp config and neovim/nvim-lspconfig

after/lsp/lua_ls.lua

@@ -0,0 +1,62 @@
+local filter_line_locations = function(locations)
+    local present, res = {}, {}
+    for _, l in ipairs(locations) do
+        local t = present[l.filename] or {}
+        if not t[l.lnum] then
+            table.insert(res, l)
+            t[l.lnum] = true
+        end
+        present[l.filename] = t
+    end
+    return res
+end
+
+local show_location = function(location)
+    local buf_id = location.bufnr or vim.fn.bufadd(location.filename)
+    vim.bo[buf_id].buflisted = true
+    vim.api.nvim_win_set_buf(0, buf_id)
+    vim.api.nvim_win_set_cursor(0, { location.lnum, location.col - 1 })
+    vim.cmd("normal! zv")
+end
+
+local on_list = function(args)
+    local items = filter_line_locations(args.items)
+    if #items > 1 then
+        vim.fn.setqflist({}, " ", { title = "LSP locations", items = items })
+        return vim.cmd("botright copen")
+    end
+    show_location(items[1])
+end
+
+local luals_unique_definition = function()
+    return vim.lsp.buf.definition({ on_list = on_list })
+end
+
+return {
+    on_attach = function(client, buf_id)
+        -- Reduce unnecessarily long list of completion triggers for better
+        -- 'mini.completion' experience
+        client.server_capabilities.completionProvider.triggerCharacters =
+            { ".", ":", "#", "(" }
+
+        -- Override global "Go to source" mapping with dedicated buffer-local
+        local opts = { buffer = buf_id, desc = "Lua source definition" }
+        vim.keymap.set("n", "<Leader>ls", luals_unique_definition, opts)
+    end,
+    settings = {
+        Lua = {
+            runtime = { version = "LuaJIT", path = vim.split(package.path, ";") },
+            diagnostics = {
+                -- Don't analyze whole workspace, as it consumes too much CPU and RAM
+                workspaceDelay = -1,
+            },
+            workspace = {
+                -- Don't analyze code from submodules
+                ignoreSubmodules = true,
+                -- Add Neovim's methods for easier code writing
+                library = { vim.env.VIMRUNTIME },
+            },
+            telemetry = { enable = false },
+        },
+    },
+}