completion setup

lua/config/init.lua

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+require("config.lazy")

lua/config/lazy.lua

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+require("lazy").setup({
+    "navarasu/onedark.nvim",
+
+    -- Auto-completion engine
+	{
+		"hrsh7th/nvim-cmp",
+		dependencies = {
+			"hrsh7th/cmp-nvim-lsp", -- lsp auto-completion
+			"hrsh7th/cmp-buffer", -- buffer auto-completion
+			"hrsh7th/cmp-path", -- path auto-completion
+			"hrsh7th/cmp-cmdline", -- cmdline auto-completion
+		},
+		config = function()
+			require("config.nvim-cmp")
+		end,
+	},
+	-- Code snippet engine
+	{
+		"L3MON4D3/LuaSnip",
+		version = "v2.*",
+	},
+})

lua/config/nvim-cmp.lua

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+local has_words_before = function()
+    unpack = unpack or table.unpack
+    local line, col = unpack(vim.api.nvim_win_get_cursor(0))
+    return col ~= 0 and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match("%s") == nil
+end
+
+local luasnip = require("luasnip")
+local cmp = require("cmp")
+
+cmp.setup({
+    snippet = {
+        -- REQUIRED - you must specify a snippet engine
+        expand = function(args)
+            require('luasnip').lsp_expand(args.body) -- For `luasnip` users.
+        end,
+    },
+    mapping = cmp.mapping.preset.insert({
+        -- Use <C-b/f> to scroll the docs
+        ['K'] = cmp.mapping.scroll_docs( -4),
+        ['J'] = cmp.mapping.scroll_docs(4),
+        -- Use <C-k/j> to switch in items
+        ['k'] = cmp.mapping.select_prev_item(),
+        ['j'] = cmp.mapping.select_next_item(),
+        -- Use <CR>(Enter) to confirm selection
+        -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
+        ['<CR>'] = cmp.mapping.confirm({ select = true }),
+
+        -- A super tab
+        -- sourc: https://github.com/hrsh7th/nvim-cmp/wiki/Example-mappings#luasnip
+        ["<Tab>"] = cmp.mapping(function(fallback)
+            -- Hint: if the completion menu is visible select next one
+            if cmp.visible() then
+                cmp.select_next_item()
+            elseif has_words_before() then
+                cmp.complete()
+            else
+                fallback()
+            end
+        end, { "i", "s" }), -- i - insert mode; s - select mode
+        ["<S-Tab>"] = cmp.mapping(function(fallback)
+            if cmp.visible() then
+                cmp.select_prev_item()
+            elseif luasnip.jumpable( -1) then
+                luasnip.jump( -1)
+            else
+                fallback()
+            end
+        end, { "i", "s" }),
+    }),
+
+  -- Let's configure the item's appearance
+  -- source: https://github.com/hrsh7th/nvim-cmp/wiki/Menu-Appearance
+  formatting = {
+      -- Set order from left to right
+      -- kind: single letter indicating the type of completion
+      -- abbr: abbreviation of "word"; when not empty it is used in the menu instead of "word"
+      -- menu: extra text for the popup menu, displayed after "word" or "abbr"
+      fields = { 'abbr', 'menu' },
+
+      -- customize the appearance of the completion menu
+      format = function(entry, vim_item)
+          vim_item.menu = ({
+              nvim_lsp = '[Lsp]',
+              luasnip = '[Luasnip]',
+              buffer = '[File]',
+              path = '[Path]',
+          })[entry.source.name]
+          return vim_item
+      end,
+  },
+
+  -- Set source precedence
+  sources = cmp.config.sources({
+      { name = 'nvim_lsp' },    -- For nvim-lsp
+      { name = 'luasnip' },     -- For luasnip user
+      { name = 'buffer' },      -- For buffer word completion
+      { name = 'path' },        -- For path completion
+  })
+})

lua/config/theme.lua

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+local onedark = require("onedark")
+
+onedark.setup{
+    style = "darker"
+}
+onedark.load()