Add lsp and key mappings

lua/plugins/config/cmp.lua

@@ -0,0 +1,46 @@
+local cmp = require("cmp")
+
+cmp.setup {
+    snippet = {
+        expand = function(args)
+            require("luasnip").lsp_expand(args.body)
+        end
+    },
+    mapping = {
+        ["<C-p>"] = cmp.mapping.select_prev_item(),
+        ["<C-n>"] = cmp.mapping.select_next_item(),
+        ["<C-d>"] = cmp.mapping.scroll_docs(-4),
+        ["<C-f>"] = cmp.mapping.scroll_docs(4),
+        ["<C-Space>"] = cmp.mapping.complete(),
+        ["<C-e>"] = cmp.mapping.close(),
+        ["<CR>"] = cmp.mapping.confirm {
+            behavior = cmp.ConfirmBehavior.Replace,
+            select = true,
+        },
+        ["<Tab>"] = function(fallback)
+            if cmp.visible() then
+                cmp.select_next_item()
+            elseif require("luasnip").expand_or_jumpable() then
+                vim.fn.feedkeys(vim.api.nvim_replace_termcodes("<Plug>luasnip-expand-or-jump", true, true, true), "")
+            else
+                fallback()
+            end
+        end,
+        ["<S-Tab>"] = function(fallback)
+            if cmp.visible() then
+                cmp.select_prev_item()
+            elseif require("luasnip").jumpable(-1) then
+                vim.fn.feedkeys(vim.api.nvim_replace_termcodes("<Plug>luasnip-jump-prev", true, true, true), "")
+            else
+                fallback()
+            end
+        end
+    },
+    sources = {
+        { name = "nvim_lsp" },
+        { name = "luasnip" },
+        { name = "buffer" },
+        { name = "nvim_lua" },
+        { name = "path" }
+    }
+}