vim-lsp-mirror/autoload/lsp/ui/vim/output.vim

let s:use_vim_popup = has('patch-8.1.1517') && g:lsp_preview_float && !has('nvim')
let s:use_nvim_float = exists('*nvim_open_win') && g:lsp_preview_float && has('nvim')
let s:use_preview = !s:use_vim_popup && !s:use_nvim_float

let s:winid = v:false
let s:prevwin = v:false
let s:preview_data = v:false

function! s:vim_popup_closed(...) abort
    let s:preview_data = v:false
endfunction

function! lsp#ui#vim#output#closepreview() abort
  if win_getid() == s:winid
    " Don't close if window got focus
    return
  endif
  "closing floats in vim8.1 must use popup_close() (nvim could use nvim_win_close but pclose
  "works)
  if s:use_vim_popup && s:winid
    call popup_close(s:winid)
  else
    pclose
  endif
  let s:winid = v:false
  let s:preview_data = v:false
  augroup lsp_float_preview_close
  augroup end
  autocmd! lsp_float_preview_close CursorMoved,CursorMovedI,VimResized *
  doautocmd User lsp_float_closed
endfunction

function! lsp#ui#vim#output#focuspreview() abort
  " This does not work for vim8.1 popup but will work for nvim and old preview
  if s:winid
    if win_getid() != s:winid
      let s:prevwin = win_getid()
      call win_gotoid(s:winid)
    elseif s:prevwin
      " Temporarily disable hooks
      " TODO: remove this when closing logic is able to distinguish different move directions
      autocmd! lsp_float_preview_close CursorMoved,CursorMovedI,VimResized *
      call win_gotoid(s:prevwin)
      call s:add_float_closing_hooks()
      let s:prevwin = v:false
    endif
  endif
endfunction

function! s:bufwidth() abort
  let width = winwidth(0)
  let numberwidth = max([&numberwidth, strlen(line('$'))+1])
  let numwidth = (&number || &relativenumber)? numberwidth : 0
  let foldwidth = &foldcolumn

  if &signcolumn ==? 'yes'
    let signwidth = 2
  elseif &signcolumn ==? 'auto'
    let signs = execute(printf('sign place buffer=%d', bufnr('')))
    let signs = split(signs, "\n")
    let signwidth = len(signs)>2? 2: 0
  else
    let signwidth = 0
  endif
  return width - numwidth - foldwidth - signwidth
endfunction


function! s:get_float_positioning(height, width) abort
    let l:height = a:height
    let l:width = a:width
    " For a start show it below/above the cursor
    " TODO: add option to configure it 'docked' at the bottom/top/right
    let l:y = winline()
    if l:y + l:height >= winheight(0)
      " Float does not fit
      if l:y > l:height
        " Fits above
        let l:y = winline() - l:height - 1
      elseif l:y - 2 > winheight(0) - l:y
        " Take space above cursor
        let l:y = 1
        let l:height = winline()-2
      else
        " Take space below cursor
        let l:height = winheight(0) -l:y
      endif
    endif
    let l:col = col('.')
    let l:style = 'minimal'
    " Positioning is not window but screen relative
    let l:opts = {
          \ 'relative': 'win',
          \ 'row': l:y,
          \ 'col': l:col,
          \ 'width': l:width,
          \ 'height': l:height,
          \ 'style': l:style,
          \ }
    return l:opts
endfunction

function! lsp#ui#vim#output#floatingpreview(data) abort
  if s:use_nvim_float
    let l:buf = nvim_create_buf(v:false, v:true)
    call setbufvar(l:buf, '&signcolumn', 'no')

    " Try to get as much space around the cursor, but at least 10x10
    let l:width = max([s:bufwidth(), 10])
    let l:height = max([&lines - winline() + 1, winline() - 1, 10])

    if g:lsp_preview_max_height > 0
        let l:height = min([g:lsp_preview_max_height, l:height])
    endif

    let l:opts = s:get_float_positioning(l:height, l:width)

    let s:winid = nvim_open_win(buf, v:true, l:opts)
    call nvim_win_set_option(s:winid, 'winhl', 'Normal:Pmenu,NormalNC:Pmenu')
    call nvim_win_set_option(s:winid, 'foldenable', v:false)
    call nvim_win_set_option(s:winid, 'wrap', v:true)
    call nvim_win_set_option(s:winid, 'statusline', '')
    call nvim_win_set_option(s:winid, 'number', v:false)
    call nvim_win_set_option(s:winid, 'relativenumber', v:false)
    call nvim_win_set_option(s:winid, 'cursorline', v:false)
    " Enable closing the preview with esc, but map only in the scratch buffer
    nmap <buffer><silent> <esc> :pclose<cr>
  elseif s:use_vim_popup
    let l:options = {
                \ 'moved': 'any',
                \ 'border': [1, 1, 1, 1],
                \ 'callback': function('s:vim_popup_closed')
                \ }

    if g:lsp_preview_max_width > 0
        let l:options['maxwidth'] = g:lsp_preview_max_width
    endif

    if g:lsp_preview_max_height > 0
        let l:options['maxheight'] = g:lsp_preview_max_height
    endif

    let s:winid = popup_atcursor('...', l:options)
  endif
  return s:winid
endfunction

function! s:setcontent(lines, ft) abort
  if s:use_vim_popup
    " vim popup
    call setbufline(winbufnr(s:winid), 1, a:lines)
    let l:lightline_toggle = v:false
    if exists('#lightline') && !has('nvim')
      " Lightline does not work in popups but does not recognize it yet.
      " It is ugly to have an check for an other plugin here, better fix lightline...
      let l:lightline_toggle = v:true
      call lightline#disable()
    endif
    call win_execute(s:winid, 'setlocal filetype=' . a:ft . '.lsp-hover')
    if l:lightline_toggle
      call lightline#enable()
    endif
  else
    " nvim floating or preview
    call setline(1, a:lines)

    setlocal readonly nomodifiable
    silent! let &l:filetype = a:ft . '.lsp-hover'
  endif
endfunction

function! s:adjust_float_placement(bufferlines, maxwidth) abort
    if s:use_nvim_float
      let l:win_config = {}
      let l:height = min([winheight(s:winid), a:bufferlines])
      let l:width = min([winwidth(s:winid), a:maxwidth])
      let l:win_config = s:get_float_positioning(l:height, l:width)
      call nvim_win_set_config(s:winid, l:win_config )
    endif
endfunction

function! s:add_float_closing_hooks() abort
    if g:lsp_preview_autoclose
      augroup lsp_float_preview_close
        autocmd! lsp_float_preview_close CursorMoved,CursorMovedI,VimResized *
        autocmd CursorMoved,CursorMovedI,VimResized * call lsp#ui#vim#output#closepreview()
      augroup END
    endif
endfunction

function! lsp#ui#vim#output#getpreviewwinid() abort
    return s:winid
endfunction

function! s:open_preview(data) abort
    if s:use_vim_popup || s:use_nvim_float
      let l:winid = lsp#ui#vim#output#floatingpreview(a:data)
    else
      execute &previewheight.'new'
      let l:winid = win_getid()
    endif
    return l:winid
endfunction

function! s:set_cursor(current_window_id, options) abort
    if !has_key(a:options, 'cursor')
        return
    endif

    if s:use_nvim_float
      " Neovim floats
      " Go back to the preview window to set the cursor
      call win_gotoid(s:winid)
      let l:old_scrolloff = &scrolloff
      let &scrolloff = 0

      call nvim_win_set_cursor(s:winid, [a:options['cursor']['line'], a:options['cursor']['col']])
      call s:align_preview(a:options)

      " Finally, go back to the original window
      call win_gotoid(a:current_window_id)

      let &scrolloff = l:old_scrolloff
    elseif s:use_vim_popup
      " Vim popups
      function! AlignVimPopup(timer) closure abort
          call s:align_preview(a:options)
      endfunction
      call timer_start(0, function('AlignVimPopup'))
    else
      " Preview
      " Don't use 'scrolloff', it might mess up the cursor's position
      let &l:scrolloff = 0
      call cursor(a:options['cursor']['line'], a:options['cursor']['col'])
      call s:align_preview(a:options)
    endif
endfunction

function! s:align_preview(options) abort
    if !has_key(a:options, 'cursor') ||
     \ !has_key(a:options['cursor'], 'align')
        return
    endif

    let l:align = a:options['cursor']['align']

    if s:use_vim_popup
        " Vim popups
        let l:pos = popup_getpos(s:winid)
        let l:below = winline() < winheight(0) / 2
        if l:below
            let l:height = min([l:pos['core_height'], winheight(0) - winline() - 2])
        else
            let l:height = min([l:pos['core_height'], winline() - 3])
        endif
        let l:width = l:pos['core_width']

        let l:options = {
                    \ 'minwidth': l:width,
                    \ 'maxwidth': l:width,
                    \ 'minheight': l:height,
                    \ 'maxheight': l:height,
                    \ 'pos': l:below ? 'topleft' : 'botleft',
                    \ 'line': l:below ? 'cursor+1' : 'cursor-1'
                    \ }

        if l:align ==? 'top'
            let l:options['firstline'] = a:options['cursor']['line']
        elseif l:align ==? 'center'
            let l:options['firstline'] = a:options['cursor']['line'] - (l:height - 1) / 2
        elseif l:align ==? 'bottom'
            let l:options['firstline'] = a:options['cursor']['line'] - l:height + 1
        endif

        call popup_setoptions(s:winid, l:options)
        redraw!
    else
        " Preview and Neovim floats
        if l:align ==? 'top'
            normal! zt
        elseif l:align ==? 'center'
            normal! zz
        elseif l:align ==? 'bottom'
            normal! zb
        endif
    endif
endfunction

function! lsp#ui#vim#output#preview(server, data, options) abort
    if s:winid && type(s:preview_data) == type(a:data)
       \ && s:preview_data == a:data
       \ && type(g:lsp_preview_doubletap) == 3
       \ && len(g:lsp_preview_doubletap) >= 1
       \ && type(g:lsp_preview_doubletap[0]) == 2
        echo ''
        return call(g:lsp_preview_doubletap[0], [])
    endif
    " Close any previously opened preview window
    pclose

    let l:current_window_id = win_getid()

    let s:winid = s:open_preview(a:data)

    let s:preview_data = a:data
    let l:lines = []
    let l:syntax_lines = []
    let l:ft = s:append(a:data, l:lines, l:syntax_lines)

    if has_key(a:options, 'filetype')
        let l:ft = a:options['filetype']
    endif

    let l:server_info = lsp#get_server_info(a:server)
    try
        let l:do_conceal = l:server_info['config']['hover_conceal']
    catch
        let l:do_conceal = g:lsp_hover_conceal
    endtry

    call setbufvar(winbufnr(s:winid), 'lsp_syntax_highlights', l:syntax_lines)
    call setbufvar(winbufnr(s:winid), 'lsp_do_conceal', l:do_conceal)
    call s:setcontent(l:lines, l:ft)

    " Get size information while still having the buffer active
    let l:maxwidth = max(map(getline(1, '$'), 'strdisplaywidth(v:val)'))
    if g:lsp_preview_max_width > 0
      let l:bufferlines = 0
      let l:maxwidth = min([g:lsp_preview_max_width, l:maxwidth])

      " Determine, for each line, how many "virtual" lines it spans, and add
      " these together for all lines in the buffer
      for l:line in getline(1, '$')
        let l:num_lines = str2nr(string(ceil(strdisplaywidth(l:line) * 1.0 / g:lsp_preview_max_width)))
        let l:bufferlines += max([l:num_lines, 1])
      endfor
    else
      let l:bufferlines = line('$')
    endif

    if s:use_preview
        " Set statusline
        if has_key(a:options, 'statusline')
            let &l:statusline = a:options['statusline']
        endif

        call s:set_cursor(l:current_window_id, a:options)
    endif

    " Go to the previous window to adjust positioning
    call win_gotoid(l:current_window_id)

    echo ''

    if s:winid && (s:use_vim_popup || s:use_nvim_float)
      if s:use_nvim_float
        " Neovim floats
        call s:adjust_float_placement(l:bufferlines, l:maxwidth)
        call s:set_cursor(l:current_window_id, a:options)
        call s:add_float_closing_hooks()
      elseif s:use_vim_popup
        " Vim popups
        call s:set_cursor(l:current_window_id, a:options)
      endif

      doautocmd User lsp_float_opened
    endif

    if !g:lsp_preview_keep_focus
      " set the focus to the preview window
      call win_gotoid(s:winid)
    endif
    return ''
endfunction

function! s:append(data, lines, syntax_lines) abort
    if type(a:data) == type([])
        for l:entry in a:data
            call s:append(entry, a:lines, a:syntax_lines)
        endfor

        return 'markdown'
    elseif type(a:data) == type('')
        call extend(a:lines, split(a:data, "\n", v:true))

        return 'markdown'
    elseif type(a:data) == type({}) && has_key(a:data, 'language')
        let l:new_lines = split(a:data.value, '\n')

        let l:i = 1
        while l:i <= len(l:new_lines)
            call add(a:syntax_lines, { 'line': len(a:lines) + l:i, 'language': a:data.language })
            let l:i += 1
        endwhile

        call extend(a:lines, l:new_lines)

        return 'markdown'
    elseif type(a:data) == type({}) && has_key(a:data, 'kind')
        call extend(a:lines, split(a:data.value, '\n', v:true))

        return a:data.kind ==? 'plaintext' ? 'text' : a:data.kind
    endif
endfunction