docs: function(hljs) {
    return {
      lexemes: /[!#@\w]+/,
      keywords: {
        keyword: //ex command
          // express version except: ! & * < = > !! # @ @@
          'N|0 P|0 X|0 a|0 ab abc abo al am an|0 ar arga argd arge argdo argg argl argu as au aug aun b|0 bN ba bad bd be bel bf bl bm bn bo bp br brea breaka breakd breakl bro bufdo buffers bun bw c|0 cN cNf ca cabc caddb cad caddf cal cat cb cc ccl cd ce cex cf cfir cgetb cgete cg changes chd che checkt cl cla clo cm cmapc cme cn cnew cnf cno cnorea cnoreme co col colo com comc comp con conf cope '+
          'cp cpf cq cr cs cst cu cuna cunme cw d|0 delm deb debugg delc delf dif diffg diffo diffp diffpu diffs diffthis dig di dl dell dj dli do doautoa dp dr ds dsp e|0 ea ec echoe echoh echom echon el elsei em en endfo endf endt endw ene ex exe exi exu f|0 files filet fin fina fini fir fix fo foldc foldd folddoc foldo for fu g|0 go gr grepa gu gv ha h|0 helpf helpg helpt hi hid his i|0 ia iabc if ij il im imapc '+
          'ime ino inorea inoreme int is isp iu iuna iunme j|0 ju k|0 keepa kee keepj lN lNf l|0 lad laddb laddf la lan lat lb lc lch lcl lcs le lefta let lex lf lfir lgetb lgete lg lgr lgrepa lh ll lla lli lmak lm lmapc lne lnew lnf ln loadk lo loc lockv lol lope lp lpf lr ls lt lu lua luad luaf lv lvimgrepa lw m|0 ma mak map mapc marks mat me menut mes mk mks mksp mkv mkvie mod mz mzf nbc nb nbs n|0 new nm nmapc nme nn nnoreme noa no noh norea noreme norm nu nun nunme ol o|0 om omapc ome on ono onoreme opt ou ounme ow p|0 '+
          'profd prof pro promptr pc ped pe perld po popu pp pre prev ps pt ptN ptf ptj ptl ptn ptp ptr pts pu pw py3 python3 py3d py3f py pyd pyf q|0 quita qa r|0 rec red redi redr redraws reg res ret retu rew ri rightb rub rubyd rubyf rund ru rv s|0 sN san sa sal sav sb sbN sba sbf sbl sbm sbn sbp sbr scrip scripte scs se setf setg setl sf sfir sh sim sig sil sl sla sm smap smapc sme sn sni sno snor snoreme sor '+
          'so spelld spe spelli spellr spellu spellw sp spr sre st sta startg startr star stopi stj sts sun sunm sunme sus sv sw sy synti sync t|0 tN tabN tabc tabdo tabe tabf tabfir tabl tabm tabnew '+
          'tabn tabo tabp tabr tabs tab ta tags tc tcld tclf te tf th tj tl tm tn to tp tr try ts tu u|0 undoj undol una unh unl unlo unm unme uns up v|0 ve verb vert vim vimgrepa vi viu vie vm vmapc vme vne vn vnoreme vs vu vunme windo w|0 wN wa wh wi winc winp wn wp wq wqa ws wu wv x|0 xa xmapc xm xme xn xnoreme xu xunme y|0 z|0 ~ '+
          // full version
          'Next Print append abbreviate abclear aboveleft all amenu anoremenu args argadd argdelete argedit argglobal arglocal argument ascii autocmd augroup aunmenu buffer bNext ball badd bdelete behave belowright bfirst blast bmodified bnext botright bprevious brewind break breakadd breakdel breaklist browse bunload '+
          'bwipeout change cNext cNfile cabbrev cabclear caddbuffer caddexpr caddfile call catch cbuffer cclose center cexpr cfile cfirst cgetbuffer cgetexpr cgetfile chdir checkpath checktime clist clast close cmap cmapclear cmenu cnext cnewer cnfile cnoremap cnoreabbrev cnoremenu copy colder colorscheme command comclear compiler continue confirm copen cprevious cpfile cquit crewind cscope cstag cunmap '+
          'cunabbrev cunmenu cwindow delete delmarks debug debuggreedy delcommand delfunction diffupdate diffget diffoff diffpatch diffput diffsplit digraphs display deletel djump dlist doautocmd doautoall deletep drop dsearch dsplit edit earlier echo echoerr echohl echomsg else elseif emenu endif endfor '+
          'endfunction endtry endwhile enew execute exit exusage file filetype find finally finish first fixdel fold foldclose folddoopen folddoclosed foldopen function global goto grep grepadd gui gvim hardcopy help helpfind helpgrep helptags highlight hide history insert iabbrev iabclear ijump ilist imap '+
          'imapclear imenu inoremap inoreabbrev inoremenu intro isearch isplit iunmap iunabbrev iunmenu join jumps keepalt keepmarks keepjumps lNext lNfile list laddexpr laddbuffer laddfile last language later lbuffer lcd lchdir lclose lcscope left leftabove lexpr lfile lfirst lgetbuffer lgetexpr lgetfile lgrep lgrepadd lhelpgrep llast llist lmake lmap lmapclear lnext lnewer lnfile lnoremap loadkeymap loadview '+
          'lockmarks lockvar lolder lopen lprevious lpfile lrewind ltag lunmap luado luafile lvimgrep lvimgrepadd lwindow move mark make mapclear match menu menutranslate messages mkexrc mksession mkspell mkvimrc mkview mode mzscheme mzfile nbclose nbkey nbsart next nmap nmapclear nmenu nnoremap '+
          'nnoremenu noautocmd noremap nohlsearch noreabbrev noremenu normal number nunmap nunmenu oldfiles open omap omapclear omenu only onoremap onoremenu options ounmap ounmenu ownsyntax print profdel profile promptfind promptrepl pclose pedit perl perldo pop popup ppop preserve previous psearch ptag ptNext '+
          'ptfirst ptjump ptlast ptnext ptprevious ptrewind ptselect put pwd py3do py3file python pydo pyfile quit quitall qall read recover redo redir redraw redrawstatus registers resize retab return rewind right rightbelow ruby rubydo rubyfile rundo runtime rviminfo substitute sNext sandbox sargument sall saveas sbuffer sbNext sball sbfirst sblast sbmodified sbnext sbprevious sbrewind scriptnames scriptencoding '+
          'scscope set setfiletype setglobal setlocal sfind sfirst shell simalt sign silent sleep slast smagic smapclear smenu snext sniff snomagic snoremap snoremenu sort source spelldump spellgood spellinfo spellrepall spellundo spellwrong split sprevious srewind stop stag startgreplace startreplace '+
          'startinsert stopinsert stjump stselect sunhide sunmap sunmenu suspend sview swapname syntax syntime syncbind tNext tabNext tabclose tabedit tabfind tabfirst tablast tabmove tabnext tabonly tabprevious tabrewind tag tcl tcldo tclfile tearoff tfirst throw tjump tlast tmenu tnext topleft tprevious '+'trewind tselect tunmenu undo undojoin undolist unabbreviate unhide unlet unlockvar unmap unmenu unsilent update vglobal version verbose vertical vimgrep vimgrepadd visual viusage view vmap vmapclear vmenu vnew '+
          'vnoremap vnoremenu vsplit vunmap vunmenu write wNext wall while winsize wincmd winpos wnext wprevious wqall wsverb wundo wviminfo xit xall xmapclear xmap xmenu xnoremap xnoremenu xunmap xunmenu yank',
        built_in: //built in func
          'abs acos add and append argc argidx argv asin atan atan2 browse browsedir bufexists buflisted bufloaded bufname bufnr bufwinnr byte2line byteidx call ceil changenr char2nr cindent clearmatches col complete complete_add complete_check confirm copy cos cosh count cscope_connection cursor '+
          'deepcopy delete did_filetype diff_filler diff_hlID empty escape eval eventhandler executable exists exp expand extend feedkeys filereadable filewritable filter finddir findfile float2nr floor fmod fnameescape fnamemodify foldclosed foldclosedend foldlevel foldtext foldtextresult foreground function '+
          'garbagecollect get getbufline getbufvar getchar getcharmod getcmdline getcmdpos getcmdtype getcwd getfontname getfperm getfsize getftime getftype getline getloclist getmatches getpid getpos getqflist getreg getregtype gettabvar gettabwinvar getwinposx getwinposy getwinvar glob globpath has has_key '+
          'haslocaldir hasmapto histadd histdel histget histnr hlexists hlID hostname iconv indent index input inputdialog inputlist inputrestore inputsave inputsecret insert invert isdirectory islocked items join keys len libcall libcallnr line line2byte lispindent localtime log log10 luaeval map maparg mapcheck '+
          'match matchadd matcharg matchdelete matchend matchlist matchstr max min mkdir mode mzeval nextnonblank nr2char or pathshorten pow prevnonblank printf pumvisible py3eval pyeval range readfile reltime reltimestr remote_expr remote_foreground remote_peek remote_read remote_send remove rename repeat '+
          'resolve reverse round screenattr screenchar screencol screenrow search searchdecl searchpair searchpairpos searchpos server2client serverlist setbufvar setcmdpos setline setloclist setmatches setpos setqflist setreg settabvar settabwinvar setwinvar sha256 shellescape shiftwidth simplify sin '+
          'sinh sort soundfold spellbadword spellsuggest split sqrt str2float str2nr strchars strdisplaywidth strftime stridx string strlen strpart strridx strtrans strwidth submatch substitute synconcealed synID synIDattr '+
          'synIDtrans synstack system tabpagebuflist tabpagenr tabpagewinnr tagfiles taglist tan tanh tempname tolower toupper tr trunc type undofile undotree values virtcol visualmode wildmenumode winbufnr wincol winheight winline winnr winrestcmd winrestview winsaveview winwidth writefile xor'
      },
      illegal: /[{:]/,
      contains: [
        hljs.NUMBER_MODE,
        hljs.APOS_STRING_MODE,
        {
          className: 'string',
          // quote with escape, comment as quote
          begin: /"((\\")|[^"\n])*("|\n)/
        },
        {
          className: 'variable',
          begin: /[bwtglsav]:[\w\d_]*/
        },
        {
          className: 'function',
          beginKeywords: 'function function!', end: '$',
          relevance: 0,
          contains: [
            hljs.TITLE_MODE,
            {
              className: 'params',
              begin: '\\(', end: '\\)'
            }
          ]
        }
      ]
    };
  }