added nvim-cmp plugin

lua/core/plugins/luasnip.lua

@@ -0,0 +1,13 @@
+return {
+    "L3MON4D3/LuaSnip",
+
+    dependencies = {
+	"rafamadriz/friendly-snippets"
+    },
+
+    config = function()
+	local luasnip = require("luasnip.loaders.from_vscode")
+
+	luasnip.lazy_load()
+    end
+}

lua/core/plugins/nvim_cmp.lua

@@ -0,0 +1,75 @@
+return {
+    "hrsh7th/nvim-cmp",
+
+    dependencies = {
+	{
+	    "L3MON4D3/LuaSnip",
+	    "saadparwaiz1/cmp_luasnip",
+	    "hrsh7th/cmp-nvim-lsp",
+	    "hrsh7th/cmp-buffer",
+	    "hrsh7th/cmp-path",
+	    "hrsh7th/cmp-cmdline",
+	    "onsails/lspkind.nvim"
+	}
+    },
+
+    config = function()
+	local cmp = require("cmp")
+	local luasnip = require("luasnip")
+	local lspking = require("lspkind")
+
+	cmp.setup({
+	    snippet = {
+		expand = function(args)
+		    luasnip.lsp_expand(args.body)
+		end
+	    },
+
+	    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" },
+		    { name = "path" }
+		}
+	    ),
+
+	    formatting = {
+		format = lspking.cmp_format({
+		    mode = "symbol_text",
+		    maxwidth = 50,
+		    ellipsis_char = "..."
+		})
+	    }
+	})
+
+	cmp.setup.cmdline("/", {
+	    mapping = cmp.mapping.preset.cmdline(),
+	    sources = {
+		{ name = "buffer" }
+	    }
+	})
+
+	cmp.setup.cmdline(":", {
+	    mapping = cmp.mapping.preset.cmdline(),
+	    sources = cmp.config.sources(
+		{
+		    { name = "path" }
+		},
+		{
+		    { name = "cmdline" }
+		}
+	    )
+	})
+    end
+}