Add proper support for snippets, and tab width

lua/core.lua

@@ -3,15 +3,12 @@ local o = vim.o
 local global = vim.g
 
 -- look and feel
-vim.opt.shortmess:append({I = true}) -- remove intro message
 o.termguicolors = true
 o.ruler = true
 o.relativenumber = true
 o.number = true
 o.showmode = false
 o.scrolloff = 10
-o.softtabstop = 2
-o.shiftwidth = 2
 
 -- controlling
 vim.opt.completeopt = {'menu', 'menuone', 'noselect'}
@@ -19,7 +16,7 @@ o.ignorecase = true
 o.smartcase = true
 o.smartindent = true
 o.autoindent = true
-o.mouse = "a"
+o.mouse = "i"
 
 -- leader settings
 global.mapleader = ' '

lua/plugins.lua

@@ -45,7 +45,11 @@ return require('packer').startup(function(use)
 	}
 
 	-- completer
-	use { 'L3MON4D3/LuaSnip', event = 'UIEnter' }
+	use {
+		'L3MON4D3/LuaSnip',
+		event = 'UIEnter',
+		requires = { 'rafamadriz/friendly-snippets' }
+	}
 	use {
 		'hrsh7th/nvim-cmp',
 		event = 'InsertEnter',
@@ -69,7 +73,7 @@ return require('packer').startup(function(use)
 	}
 
 	-- formating and editing
-	use { "williamboman/mason.nvim", event = 'BufEnter'}
+	use { "williamboman/mason.nvim", event = 'BufEnter' }
 	use {
 		'windwp/nvim-autopairs',
 		after = 'nvim-cmp',
@@ -146,7 +150,8 @@ return require('packer').startup(function(use)
 			require 'treesitter-context'.setup {
 				enable = true, -- Enable this plugin (Can be enabled/disabled later via commands)
 				max_lines = 0, -- How many lines the window should span. Values <= 0 mean no limit.
-				patterns = { -- Match patterns for TS nodes. These get wrapped to match at word boundaries.
+				patterns = {
+					-- Match patterns for TS nodes. These get wrapped to match at word boundaries.
 					-- For all filetypes
 					-- Note that setting an entry here replaces all other patterns for this entry.
 					-- By setting the 'default' entry below, you can control which nodes you want to

lua/plugins/cmp.lua

@@ -1,15 +1,16 @@
-local cmp = require 'cmp'
-local luasnip = require("luasnip")
+require("luasnip.loaders.from_vscode").lazy_load()
 
 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
+	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({
+	-- ... Your other configuration ...
 	snippet = {
 		-- REQUIRED - you must specify a snippet engine
 		expand = function(args)
@@ -17,28 +18,22 @@ cmp.setup({
 			require('luasnip').lsp_expand(args.body) -- For `luasnip` users.
 			-- require('snippy').expand_snippet(args.body) -- For `snippy` users.
 			-- vim.fn["UltiSnips#Anon"](args.body) -- For `ultisnips` users.
-        end
+		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}),
+	mapping = {
 				["<Tab>"] = cmp.mapping(function(fallback)
 			if cmp.visible() then
 				cmp.select_next_item()
+				-- You could replace the expand_or_jumpable() calls with expand_or_locally_jumpable()
+				-- they way you will only jump inside the snippet region
 			elseif luasnip.expand_or_jumpable() then
 				luasnip.expand_or_jump()
+			elseif has_words_before() then
+				cmp.complete()
 			else
 				fallback()
 			end
-        end, {"i", "s"}),
-
+		end, { "i", "s" }),
 				["<S-Tab>"] = cmp.mapping(function(fallback)
 			if cmp.visible() then
 				cmp.select_prev_item()
@@ -47,27 +42,53 @@ cmp.setup({
 			else
 				fallback()
 			end
-        end, {"i", "s"})
-    }),
-    sources = cmp.config.sources({{name = 'nvim_lsp'}}, {{name = 'treesitter'}},
-                                 {{name = 'luasnip'}},
-                                 {{name = 'buffer'}, {name = 'path'}})
+		end, { "i", "s" }),
+				['<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 }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items
+		-- ... Your other mappings ...
+	},
+	sources = cmp.config.sources({
+		{ name = "nvim_lsp" },
+		{ name = "treesitter" },
+		{ name = "buffer" },
+		{ name = "luasnip" }, -- For luasnip users.
+		{ name = "path" },
+		{ name = "git" },
+		{ name = "ctags" },
+	})
+	-- ... Your other configuration ...
 })
 
--- Use buffer source for `/` (if you enabled `native_menu`, this won't work anymore).
-cmp.setup.cmdline('/', {
+cmp.setup.cmdline({ '/', '?' }, {
 	mapping = cmp.mapping.preset.cmdline(),
-    sources = {{name = 'nvim_lsp_document_symbol'}, {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'}})
+	sources = {
+		{ name = 'buffer' }
+	}
 })
 
 -- Set configuration for specific filetype.
 cmp.setup.filetype('gitcommit', {
-    sources = cmp.config.sources({{name = 'git'}},
-                                 {{name = 'buffer'}})
+	sources = cmp.config.sources({
+		{ name = 'cmp_git' }, -- You can specify the `cmp_git` source if you were installed it.
+	}, {
+		{ name = 'buffer' },
+	})
+})
+
+-- `:` cmdline setup.
+cmp.setup.cmdline(':', {
+	mapping = cmp.mapping.preset.cmdline(),
+	sources = cmp.config.sources({
+		{ name = 'path' }
+	}, {
+		{
+			name = 'cmdline',
+			option = {
+				ignore_cmds = { 'Man', '!' }
+			}
+		}
+	})
 })