Quickly evaluate C and Python code in the current buffer (Shift + Enter).

quickeval.vim

let s:buf_nr = -1

function! EvalView()
    if !bufexists(s:buf_nr)
        leftabove vnew
        file `="[Eval]"`
        let s:buf_nr = bufnr('%')
    elseif bufwinnr(s:buf_nr) == -1
        leftabove vsplit
        exe s:buf_nr . 'buffer'
        delete _
    elseif bufwinnr(s:buf_nr) != bufwinnr('%')
        exe bufwinnr(s:buf_nr) . 'wincmd w'
    endif

    setlocal bufhidden=delete
    setlocal buftype=nofile
    setlocal noswapfile
    setlocal nobuflisted
    setlocal modifiable
    setlocal nocursorline
    setlocal nocursorcolumn
    setlocal iskeyword+=:
    setlocal iskeyword-=-

    au BufHidden <buffer> call let <SID>buf_nr = -1
endfunction


function! PyEval()
    let l:w = winnr()
    silent let l:script = join(getline(0, "$"), "\n")
    silent let l:content = system("cat<<'EOF' | python3\n" . l:script . "\nEOF\n")
    "silent! let content = system('python solve.py < sample.in')
    silent! call EvalView()
    setlocal modifiable
    silent! %d _
    silent! put! =content
    silent! normal gg
    setlocal nomodifiable
    exe l:w . 'wincmd w'
endfunction


function! CEval()
    let l:w = winnr()
    silent let l:script = join(getline(0, "$"), "\n")
    silent let l:content = system("rm -f /tmp/ceval")
    silent let l:content = system("cat<<'EOF' | gcc -std=c99 -Wall -Werror -xc -O3 -o /tmp/ceval - && /tmp/ceval\n" . l:script . "\nEOF\n")
    silent! call EvalView()
    setlocal modifiable
    silent! %d _
    silent! put! =content
    silent! normal gg
    setlocal nomodifiable
    exe l:w . 'wincmd w'
endfunction

au FileType python map <buffer> <S-cr> :call PyEval()<CR>
au FileType c map <buffer> <S-cr> :call CEval()<CR>