Inside a vim file
<C-c>to evaluate the current line.{Visual}<C-c>to evaluate a region.
Custom mapping
" custom mapping
let g:eval_viml_n = "<C-c>"
let g:eval_viml_v = "<C-c>"
" manual mapping
let g:eval_viml_map_keys = 0
nmap <silent> <C-c> <Plug>eval_viml
vmap <silent> <C-c> <Plug>eval_viml_region