spruce up vimrc with comments and some features

config/vim/.vim/vimrc

@@ -1,48 +1,60 @@
-"
-" minimal vimrc with no (extra) plugins
-"
+"--------------
+" a minimal vimrc
+"--------------
 
 "load system defaults
+"--------------------
 if filereadable(expand('$VIMRUNTIME/defaults.vim'))
-	unlet! g:skip_defaults_vim
-	source $VIMRUNTIME/defaults.vim
+  unlet! g:skip_defaults_vim
+  source $VIMRUNTIME/defaults.vim
 endif
 
 "regular settings
 "----------------
 " ui
-set number
-set ruler
-set wildmenu
-set showcmd
-set showmatch
+set number    " line numbers
+set ruler     " line # in the statusline
+set wildmenu  " vim command completion menu
+set showcmd   " show the current normal mode command
+set showmatch " show matching symbols like (), {}
+set hidden    " allow unsaved buffers in background
 
 " encoding/format
-set encoding=utf-8
-set fileformats=unix,dos,mac
+set encoding=utf-8            " utf-8 (basically) standard
+set fileformats=unix,dos,mac  " controls newline styles
 
 " searching
-set hlsearch
-set incsearch
-set ignorecase
-set smartcase
+set hlsearch    " highlight all matches for a search
+set incsearch   " incremental search by character
+set ignorecase  " ignore alphabetical case of search
+set smartcase   " ignore unless there is a capital letter
 
-" indent
-set shiftwidth=4
-set tabstop=4
-set softtabstop=4
-set autoindent
+" tab/space indent and whitespace
+set tabstop=2     " tabstop is the num to use for a tab character
+set softtabstop=2 " softtabstop makes up the difference between tab and space
+set shiftwidth=2  " shiftwidth applies to indenting with < and >
+set expandtab     " use space characters to indent instead of tab characters
+set autoindent    " try to autoindent based on context
+set backspace=indent,eol,start  " lets you backspace over anything
 
 " key timeout values
-set esckeys
-set ttimeoutlen=20
-set timeoutlen=1000
+set esckeys         " allow <ESC> to be registered instantly
+set timeoutlen=1000 " keymap timeout value (1 second in ms)
+set ttimeoutlen=20  " time out for keycodes (20ms)
 
 " allow syntax and filetype plugins
 syntax enable
 filetype plugin indent on
 runtime macros/matchit.vim
 
+" keybinds
+"----------
+let mapleader = " "
+nnoremap <leader>l :set list!<CR>
+nnoremap <leader>t2 :set ts=2 sts=2 sw=2 expandtab<CR>
+nnoremap <leader>t4 :set ts=4 sts=4 sw=4 expandtab<CR>
+nnoremap <leader>t4t :set ts=4 sts=4 sw=4 noexpandtab<CR>
+
 " autocmds
 "---------
 augroup general
@@ -58,7 +70,7 @@ augroup languages
     autocmd!
     autocmd BufNewFile,BufRead *.bash set syntax=sh
     autocmd FileType python xnoremap <leader>r <esc>:'<,'>:w !python3<CR>
-    autocmd FileType go set noexpandtab
+    autocmd FileType go setlocal noexpandtab ts=4 sts=4 sw=4
     autocmd FileType html :syntax sync fromstart
     autocmd FileType html,javascript,css,json,yaml,sh
                 \ setlocal ts=2 sts=2 sw=2 expandtab