" Register LSP servers

"" Register clangd C and C++ lanuage server.
if executable('clangd')
    augroup lsp_clangd
        autocmd!
        autocmd User lsp_setup call lsp#register_server({
                    \ 'name': 'clangd',
                    \ 'cmd': {server_info->['clangd']},
                    \ 'whitelist': ['c', 'cpp', 'cxx', 'objc', 'objcpp'],
                    \ })
        autocmd FileType c setlocal omnifunc=lsp#complete
        autocmd FileType cpp setlocal omnifunc=lsp#complete
        autocmd FileType objc setlocal omnifunc=lsp#complete
        autocmd FileType objcpp setlocal omnifunc=lsp#complete
    augroup end
endif

function! s:on_lsp_buffer_enabled() abort
    setlocal omnifunc=lsp#complete
    setlocal signcolumn=yes
    if exists('+tagfunc') | setlocal tagfunc=lsp#tagfunc | endif
    nmap <buffer> gd <plug>(lsp-definition)
    nmap <buffer> gs <plug>(lsp-document-symbol-search)
    nmap <buffer> gS <plug>(lsp-workspace-symbol-search)
    nmap <buffer> gr <plug>(lsp-references)
    nmap <buffer> gi <plug>(lsp-implementation)
    nmap <buffer> gt <plug>(lsp-type-definition)
    nmap <buffer> <leader>rn <plug>(lsp-rename)
    nmap <buffer> [g <plug>(lsp-previous-diagnostic)
    nmap <buffer> ]g <plug>(lsp-next-diagnostic)
    nmap <buffer> K <plug>(lsp-hover)
    nnoremap <buffer> <expr><c-f> lsp#scroll(+4)
    nnoremap <buffer> <expr><c-d> lsp#scroll(-4)

    let g:lsp_format_sync_timeout = 1000
    autocmd! BufWritePre *.rs,*.go call execute('LspDocumentFormatSync')

    " refer to doc to add more commands
endfunction

augroup lsp_install
    au!
    " call s:on_lsp_buffer_enabled only for languages that has the server registered.
    autocmd User lsp_buffer_enabled call s:on_lsp_buffer_enabled()
augroup END