vimrc tips and tricks from instructure

.vimrc

" classic conundrum
nnoremap <up> <nop>
nnoremap <down> <nop>
nnoremap <left> <nop>
nnoremap <right> <nop>
inoremap <up> <nop>
inoremap <down> <nop>
inoremap <left> <nop>
inoremap <right> <nop>

" ericb
" Use The Silver Searcher https://github.com/ggreer/the_silver_searcher
if executable('ag')
  " Use Ag over Grep
  set grepprg=ag\ --nogroup\ --nocolor
 
  " Use ag in CtrlP for listing files. Lightning fast and respects .gitignore
  let g:ctrlp_user_command = 'ag %s -l --nocolor -g ""'
 
  " ag is fast enough that CtrlP doesn't need to cache
  let g:ctrlp_use_caching = 0
endif

" ddorman
function! TrimWhiteSpace()
  let l:cursor = getpos(".")
  %s/\s\+$//e
  call setpos('.', l:cursor)
endfunction

autocmd BufWritePre * :call TrimWhiteSpace()
autocmd FileWritePre * :call TrimWhiteSpace()

" zachp
set number
set relativenumber
function! NumberToggle()
  if(&relativenumber == 1)
    set number
  else
    set relativenumber
  endif
endfunc
 
nnoremap <F3> :call NumberToggle()<CR>

" brianp
" Run spec under the cursor
nmap <leader>r :wa <CR> :execute "!bundle exec spec " . expand('%') . ':' . line('.')<CR>

" simon
" Remember last location in file
if has("autocmd")
  au BufReadPost * if line("'\"") > 0 && line("'\"") <= line("$")
        \| exe "normal g'\"" | endif
endif

" simon
" Save when losing focus
au FocusLost * :wa