vimrc essentials

setlocal spell spelllang=en_us
map <F6> <Esc>:setlocal spell spelllang=en_us<CR>
map <F8> <Esc>:setlocal nospell<CR>

" toggle colored right border after 80 chars
set colorcolumn=81
let s:color_column_old = 0

function! s:ToggleColorColumn()
if s:color_column_old == 0
let s:color_column_old = &colorcolumn
windo let &colorcolumn = 0
else
windo let &colorcolumn=s:color_column_old
let s:color_column_old = 0
endif
endfunction

nnoremap <Leader>8 :call <SID>ToggleColorColumn()<cr>

Convert images to pdf

convert -define pdf:use-trimbox=true *.png output.pdf