added nvim-cmp for completions

lua/plugins/completions.lua

@@ -0,0 +1,68 @@
+return {
+    "hrsh7th/nvim-cmp",
+    lazy = false,
+    dependencies = {
+        -- base
+        "hrsh7th/cmp-nvim-lsp",
+        "hrsh7th/cmp-buffer",
+        "hrsh7th/cmp-path",
+        "hrsh7th/cmp-cmdline",
+        -- snippets
+        "L3MON4D3/LuaSnip",
+        "saadparwaiz1/cmp_luasnip",
+    },
+    config = function()
+        local cmp = require("cmp");
+
+        cmp.setup({
+            snippet = {
+                expand = function(args)
+                    require("luasnip").lsp_expand(args.body)
+                end,
+            },
+            window = {
+                completion = cmp.config.window.bordered(),
+                -- documentation = cmp.config.window.bordered(),
+            },
+            mapping = cmp.mapping.preset.insert({
+                ["<C-b>"] = cmp.mapping.scroll_docs(-4),
+                ["<C-f>"] = cmp.mapping.scroll_docs(4),
+                ["<C-Space>"] = cmp.mapping.complete(),
+                ["<C-e>"] = cmp.mapping.abort(),
+                ["<CR>"] = cmp.mapping.confirm({ select = true }),
+            }),
+            sources = cmp.config.sources({
+                { name = "nvim_lsp" },
+                { name = "luasnip" },
+            }, {
+                { name = "buffer" },
+            })
+        })
+
+        vim.api.nvim_create_autocmd("BufRead", {
+            group = vim.api.nvim_create_augroup("CmpSourceCargo", { clear = true }),
+            pattern = "Cargo.toml",
+            callback = function()
+                cmp.setup.buffer({ sources = { { name = "crates" } } })
+            end,
+        })
+
+        -- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won"t work anymore).
+        cmp.setup.cmdline({ "/", "?" }, {
+            mapping = cmp.mapping.preset.cmdline(),
+            sources = {
+                { name = "buffer" }
+            }
+        })
+
+        -- Use cmdline & path source for ":" (if you enabled `native_menu`, this won"t work anymore).
+        cmp.setup.cmdline(":", {
+            mapping = cmp.mapping.preset.cmdline(),
+            sources = cmp.config.sources({
+                { name = "path" }
+            }, {
+                { name = "cmdline" }
+            })
+        })
+    end,
+}

lua/plugins/lsp.lua

@@ -30,14 +30,24 @@ vim.api.nvim_create_autocmd('LspAttach', {
 return {
     {
         "neovim/nvim-lspconfig",
+        dependencies = {
+            "hrsh7th/cmp-nvim-lsp",
+        },
         config = function()
             local lspconfig = require("lspconfig")
 
-            lspconfig.pyright.setup({})
+            local capabilities = require("cmp_nvim_lsp").default_capabilities();
 
-            lspconfig.rust_analyzer.setup({})
+            lspconfig.pyright.setup({
+                capabilities = capabilities,
+            })
+
+            lspconfig.rust_analyzer.setup({
+                capabilities = capabilities,
+            })
 
             lspconfig.lua_ls.setup({
+                capabilities = capabilities,
                 settings = {
                     Lua = {
                         runtime = {

lua/plugins/snippets.lua

@@ -0,0 +1,4 @@
+return {
+    "L3MON4D3/LuaSnip",
+    version = "v2.*",
+}