"])
endif

exe s:orgwin . "wincmd w"

" caches of style data
" initialize to include line numbers if using them
if s:settings.number_lines
  let s:stylelist = { s:LINENR_ID : ".LineNr { " . s:CSS1( s:LINENR_ID ) . "}" }
else
  let s:stylelist = {}
endif
let s:diffstylelist = {
      \   s:DIFF_A_ID : ".DiffAdd { " . s:CSS1( s:DIFF_A_ID ) . "}",
      \   s:DIFF_C_ID : ".DiffChange { " . s:CSS1( s:DIFF_C_ID ) . "}",
      \   s:DIFF_D_ID : ".DiffDelete { " . s:CSS1( s:DIFF_D_ID ) . "}",
      \   s:DIFF_T_ID : ".DiffText { " . s:CSS1( s:DIFF_T_ID ) . "}"
      \ }

" set up progress bar in the status line
if !s:settings.no_progress
  " ProgressBar Indicator
  let s:progressbar={}

  " Progressbar specific functions

  func! s:SetProgbarColor()
    if hlID("TOhtmlProgress") != 0
      hi! link TOhtmlProgress_auto TOhtmlProgress
    elseif hlID("TOhtmlProgress_auto")==0 ||
       \ !exists("s:last_colors_name") || !exists("g:colors_name") ||
       \ g:colors_name != s:last_colors_name
      let s:last_colors_name = exists("g:colors_name") ? g:colors_name : "none"

      let l:diffatr = synIDattr(hlID("DiffDelete"), "reverse", s:whatterm) ? "fg#" : "bg#"
      let l:stlatr = synIDattr(hlID("StatusLine"), "reverse", s:whatterm) ? "fg#" : "bg#"

      let l:progbar_color = synIDattr(hlID("DiffDelete"), l:diffatr, s:whatterm)
      let l:stl_color = synIDattr(hlID("StatusLine"), l:stlatr, s:whatterm)

      if "" == l:progbar_color
	let l:progbar_color = synIDattr(hlID("DiffDelete"), "reverse", s:whatterm) ? s:fgc : s:bgc
      endif
      if "" == l:stl_color
	let l:stl_color = synIDattr(hlID("StatusLine"), "reverse", s:whatterm) ? s:fgc : s:bgc
      endif

      if l:progbar_color == l:stl_color
	if s:whatterm == 'cterm'
	  if l:progbar_color >= (&t_Co/2)
	    let l:progbar_color-=1
	  else
	    let l:progbar_color+=1
	  endif
	else
	  let l:rgb = map(matchlist(l:progbar_color, '#\zs\x\x\ze\(\x\x\)\(\x\x\)')[:2], 'str2nr(v:val, 16)')
	  let l:avg = (l:rgb[0] + l:rgb[1] + l:rgb[2])/3
	  if l:avg >= 128
	    let l:avg_new = l:avg
	    while l:avg - l:avg_new < 0x15
	      let l:rgb = map(l:rgb, 'v:val * 3 / 4')
	      let l:avg_new = (l:rgb[0] + l:rgb[1] + l:rgb[2])/3
	    endwhile
	  else
	    let l:avg_new = l:avg
	    while l:avg_new - l:avg < 0x15
	      let l:rgb = map(l:rgb, 'min([max([v:val, 4]) * 5 / 4, 255])')
	      let l:avg_new = (l:rgb[0] + l:rgb[1] + l:rgb[2])/3
	    endwhile
	  endif
	  let l:progbar_color = printf("#%02x%02x%02x", l:rgb[0], l:rgb[1], l:rgb[2])
	endif
	echomsg "diff detected progbar color set to" l:progbar_color
      endif
      exe "hi TOhtmlProgress_auto" s:whatterm."bg=".l:progbar_color
    endif
  endfun

  func! s:ProgressBar(title, max_value, winnr)
    let pgb=copy(s:progressbar)
    let pgb.title = a:title.' '
    let pgb.max_value = a:max_value
    let pgb.winnr = a:winnr
    let pgb.cur_value = 0

    let pgb.items = { 'title'   : { 'color' : 'Statusline' },
	  \'bar'     : { 'color' : 'Statusline' , 'fillcolor' : 'TOhtmlProgress_auto' , 'bg' : 'Statusline' } ,
	  \'counter' : { 'color' : 'Statusline' } }
    let pgb.last_value = 0
    let pgb.needs_redraw = 0
    " Note that you must use len(split) instead of len() if you want to use 
    " unicode in title.
    "
    " Subtract 3 for spacing around the title.
    " Subtract 4 for the percentage display.
    " Subtract 2 for spacing before this.
    " Subtract 2 more for the '|' on either side of the progress bar
    let pgb.subtractedlen=len(split(pgb.title, '\zs'))+3+4+2+2
    let pgb.max_len = 0
    set laststatus=2
    return pgb
  endfun

  " Function: progressbar.calculate_ticks() {{{1
  func! s:progressbar.calculate_ticks(pb_len)
    if a:pb_len<=0
      let pb_len = 100
    else
      let pb_len = a:pb_len
    endif
    let self.progress_ticks = map(range(pb_len+1), "v:val * self.max_value / pb_len")
  endfun

  "Function: progressbar.paint()
  func! s:progressbar.paint()
    " Recalculate widths.
    let max_len = winwidth(self.winnr)
    let pb_len = 0
    " always true on first call because of initial value of self.max_len
    if max_len != self.max_len
      let self.max_len = max_len

      " Progressbar length
      let pb_len = max_len - self.subtractedlen

      call self.calculate_ticks(pb_len)

      let self.needs_redraw = 1
      let cur_value = 0
      let self.pb_len = pb_len
    else
      " start searching at the last found index to make the search for the
      " appropriate tick value normally take 0 or 1 comparisons
      let cur_value = self.last_value
      let pb_len = self.pb_len
    endif

    let cur_val_max = pb_len > 0 ? pb_len : 100

    " find the current progress bar position based on precalculated thresholds
    while cur_value < cur_val_max && self.cur_value > self.progress_ticks[cur_value]
      let cur_value += 1
    endwhile

    " update progress bar
    if self.last_value != cur_value || self.needs_redraw || self.cur_value == self.max_value
      let self.needs_redraw = 1
      let self.last_value = cur_value

      let t_color  = self.items.title.color
      let b_fcolor = self.items.bar.fillcolor
      let b_color  = self.items.bar.color
      let c_color  = self.items.counter.color

      let stl =  "%#".t_color."#%-( ".self.title." %)".
	    \"%#".b_color."#".
	    \(pb_len>0 ?
	    \	('|%#'.b_fcolor."#%-(".repeat(" ",cur_value)."%)".
	    \	 '%#'.b_color."#".repeat(" ",pb_len-cur_value)."|"):
	    \	('')).
	    \"%=%#".c_color."#%( ".printf("%3.d ",100*self.cur_value/self.max_value)."%% %)"
      call setwinvar(self.winnr, '&stl', stl)
    endif
  endfun

  func! s:progressbar.incr( ... )
    let self.cur_value += (a:0 ? a:1 : 1)
    " if we were making a general-purpose progress bar, we'd need to limit to a
    " lower limit as well, but since we always increment with a positive value
    " in this script, we only need limit the upper value
    let self.cur_value = (self.cur_value > self.max_value ? self.max_value : self.cur_value)
    call self.paint()
  endfun
  " }}}
  if s:settings.dynamic_folds
    " to process folds we make two passes through each line
    let s:pgb = s:ProgressBar("Processing folds:", line('$')*2, s:orgwin)
  endif

  call s:SetProgbarColor()
endif

" First do some preprocessing for dynamic folding. Do this for the entire file
" so we don't accidentally start within a closed fold or something.
let s:allfolds = []

if s:settings.dynamic_folds
  let s:lnum = 1
  let s:end = line('$')
  " save the fold text and set it to the default so we can find fold levels
  let s:foldtext_save = &foldtext
  setlocal foldtext&

  " we will set the foldcolumn in the html to the greater of the maximum fold
  " level and the current foldcolumn setting
  let s:foldcolumn = &foldcolumn

  " get all info needed to describe currently closed folds
  while s:lnum <= s:end
    if foldclosed(s:lnum) == s:lnum
      " default fold text has '+-' and then a number of dashes equal to fold
      " level, so subtract 2 from index of first non-dash after the dashes
      " in order to get the fold level of the current fold
      let s:level = match(foldtextresult(s:lnum), '+-*\zs[^-]') - 2
      " store fold info for later use
      let s:newfold = {'firstline': s:lnum, 'lastline': foldclosedend(s:lnum), 'level': s:level,'type': "closed-fold"}
      call add(s:allfolds, s:newfold)
      " open the fold so we can find any contained folds
      execute s:lnum."foldopen"
    else
      if !s:settings.no_progress
	call s:pgb.incr()
	if s:pgb.needs_redraw
	  redrawstatus
	  let s:pgb.needs_redraw = 0
	endif
      endif
      let s:lnum = s:lnum + 1
    endif
  endwhile

  " close all folds to get info for originally open folds
  silent! %foldclose!
  let s:lnum = 1

  " the originally open folds will be all folds we encounter that aren't
  " already in the list of closed folds
  while s:lnum <= s:end
    if foldclosed(s:lnum) == s:lnum
      " default fold text has '+-' and then a number of dashes equal to fold
      " level, so subtract 2 from index of first non-dash after the dashes
      " in order to get the fold level of the current fold
      let s:level = match(foldtextresult(s:lnum), '+-*\zs[^-]') - 2
      let s:newfold = {'firstline': s:lnum, 'lastline': foldclosedend(s:lnum), 'level': s:level,'type': "closed-fold"}
      " only add the fold if we don't already have it
      if empty(s:allfolds) || index(s:allfolds, s:newfold) == -1
	let s:newfold.type = "open-fold"
	call add(s:allfolds, s:newfold)
      endif
      " open the fold so we can find any contained folds
      execute s:lnum."foldopen"
    else
      if !s:settings.no_progress
	call s:pgb.incr()
	if s:pgb.needs_redraw
	  redrawstatus
	  let s:pgb.needs_redraw = 0
	endif
      endif
      let s:lnum = s:lnum + 1
    endif
  endwhile

  " sort the folds so that we only ever need to look at the first item in the
  " list of folds
  call sort(s:allfolds, "s:FoldCompare")

  let &l:foldtext = s:foldtext_save
  unlet s:foldtext_save

  " close all folds again so we can get the fold text as we go
  silent! %foldclose!

  " Go through and remove folds we don't need to (or cannot) process in the
  " current conversion range
  "
  " If a fold is removed which contains other folds, which are included, we need
  " to adjust the level of the included folds as used by the conversion logic
  " (avoiding special cases is good)
  "
  " Note any time we remove a fold, either all of the included folds are in it,
  " or none of them, because we only remove a fold if neither its start nor its
  " end are within the conversion range.
  let leveladjust = 0
  for afold in s:allfolds
    let removed = 0
    if exists("g:html_start_line") && exists("g:html_end_line")
      if afold.firstline < g:html_start_line
	if afold.lastline <= g:html_end_line && afold.lastline >= g:html_start_line
	  " if a fold starts before the range to convert but stops within the
	  " range, we need to include it. Make it start on the first converted
	  " line.
	  let afold.firstline = g:html_start_line
	else
	  " if the fold lies outside the range or the start and stop enclose
	  " the entire range, don't bother parsing it
	  call remove(s:allfolds, index(s:allfolds, afold))
	  let removed = 1
	  if afold.lastline > g:html_end_line
	    let leveladjust += 1
	  endif
	endif
      elseif afold.firstline > g:html_end_line
	" If the entire fold lies outside the range we need to remove it.
	call remove(s:allfolds, index(s:allfolds, afold))
	let removed = 1
      endif
    elseif exists("g:html_start_line")
      if afold.firstline < g:html_start_line
	" if there is no last line, but there is a first line, the end of the
	" fold will always lie within the region of interest, so keep it
	let afold.firstline = g:html_start_line
      endif
    elseif exists("g:html_end_line")
      " if there is no first line we default to the first line in the buffer so
      " the fold start will always be included if the fold itself is included.
      " If however the entire fold lies outside the range we need to remove it.
      if afold.firstline > g:html_end_line
	call remove(s:allfolds, index(s:allfolds, afold))
	let removed = 1
      endif
    endif
    if !removed
      let afold.level -= leveladjust
      if afold.level+1 > s:foldcolumn
	let s:foldcolumn = afold.level+1
      endif
    endif
  endfor

  " if we've removed folds containing the conversion range from processing,
  " getting foldtext as we go won't know to open the removed folds, so the
  " foldtext would be wrong; open them now.
  "
  " Note that only when a start and an end line is specified will a fold
  " containing the current range ever be removed.
  while leveladjust > 0
    exe g:html_start_line."foldopen"
    let leveladjust -= 1
  endwhile
endif

" Now loop over all lines in the original text to convert to html.
" Use html_start_line and html_end_line if they are set.
if exists("g:html_start_line")
  let s:lnum = html_start_line
  if s:lnum < 1 || s:lnum > line("$")
    let s:lnum = 1
  endif
else
  let s:lnum = 1
endif
if exists("g:html_end_line")
  let s:end = html_end_line
  if s:end < s:lnum || s:end > line("$")
    let s:end = line("$")
  endif
else
  let s:end = line("$")
endif

" stack to keep track of all the folds containing the current line
let s:foldstack = []

if !s:settings.no_progress
  let s:pgb = s:ProgressBar("Processing lines:", s:end - s:lnum + 1, s:orgwin)
endif

if s:settings.number_lines
  let s:margin = strlen(s:end) + 1
else
  let s:margin = 0
endif

if has('folding') && !s:settings.ignore_folding
  let s:foldfillchar = &fillchars[matchend(&fillchars, 'fold:')]
  if s:foldfillchar == ''
    let s:foldfillchar = '-'
  endif
endif
let s:difffillchar = &fillchars[matchend(&fillchars, 'diff:')]
if s:difffillchar == ''
  let s:difffillchar = '-'
endif

let s:foldId = 0

if !s:settings.expand_tabs
  " If keeping tabs, add them to printable characters so we keep them when
  " formatting text (strtrans() doesn't replace printable chars)
  let s:old_isprint = &isprint
  setlocal isprint+=9
endif

while s:lnum <= s:end

  " If there are filler lines for diff mode, show these above the line.
  let s:filler = diff_filler(s:lnum)
  if s:filler > 0
    let s:n = s:filler
    while s:n > 0
      let s:new = repeat(s:difffillchar, 3)

      if s:n > 2 && s:n < s:filler && !s:settings.whole_filler
	let s:new = s:new . " " . s:filler . " inserted lines "
	let s:n = 2
      endif

      if !s:settings.no_pre
	" HTML line wrapping is off--go ahead and fill to the margin
	" TODO: what about when CSS wrapping is turned on?
	let s:new = s:new . repeat(s:difffillchar, &columns - strlen(s:new) - s:margin)
      else
	let s:new = s:new . repeat(s:difffillchar, 3)
      endif

      let s:new = s:HtmlFormat_d(s:new, s:DIFF_D_ID, 0)
      if s:settings.number_lines
	" Indent if line numbering is on. Indent gets style of line number
	" column.
	let s:new = s:HtmlFormat_n(repeat(' ', s:margin), s:LINENR_ID, 0, 0) . s:new
      endif
      if s:settings.dynamic_folds && !s:settings.no_foldcolumn && s:foldcolumn > 0
	" Indent for foldcolumn if there is one. Assume it's empty, there should
	" not be a fold for deleted lines in diff mode.
	let s:new = s:FoldColumn_fill() . s:new
      endif
      call add(s:lines, s:new.s:HtmlEndline)

      let s:n = s:n - 1
    endwhile
    unlet s:n
  endif
  unlet s:filler

  " Start the line with the line number.
  if s:settings.number_lines
    let s:numcol = repeat(' ', s:margin - 1 - strlen(s:lnum)) . s:lnum . ' '
  endif

  let s:new = ""

  if has('folding') && !s:settings.ignore_folding && foldclosed(s:lnum) > -1 && !s:settings.dynamic_folds
    "
    " This is the beginning of a folded block (with no dynamic folding)
    let s:new = foldtextresult(s:lnum)
    if !s:settings.no_pre
      " HTML line wrapping is off--go ahead and fill to the margin
      let s:new = s:new . repeat(s:foldfillchar, &columns - strlen(s:new))
    endif

    " put numcol in a separate group for sake of unselectable text
    let s:new = (s:settings.number_lines ? s:HtmlFormat_n(s:numcol, s:FOLDED_ID, 0, s:lnum): "") . s:HtmlFormat_t(s:new, s:FOLDED_ID, 0)

    " Skip to the end of the fold
    let s:new_lnum = foldclosedend(s:lnum)

    if !s:settings.no_progress
      call s:pgb.incr(s:new_lnum - s:lnum)
    endif

    let s:lnum = s:new_lnum

  else
    "
    " A line that is not folded, or doing dynamic folding.
    "
    let s:line = getline(s:lnum)
    let s:len = strlen(s:line)

    if s:settings.dynamic_folds
      " First insert a closing for any open folds that end on this line
      while !empty(s:foldstack) && get(s:foldstack,0).lastline == s:lnum-1
	let s:new = s:new.""
	call remove(s:foldstack, 0)
      endwhile

      " Now insert an opening for any new folds that start on this line
      let s:firstfold = 1
      while !empty(s:allfolds) && get(s:allfolds,0).firstline == s:lnum
	let s:foldId = s:foldId + 1
	let s:new .= ""


	" Unless disabled, add a fold column for the opening line of a fold.
	"
	" Note that dynamic folds require using css so we just use css to take
	" care of the leading spaces rather than using   in the case of
	" html_no_pre to make it easier
	if !s:settings.no_foldcolumn
	  " add fold column that can open the new fold
	  if s:allfolds[0].level > 1 && s:firstfold
	    let s:new = s:new . s:FoldColumn_build('|', s:allfolds[0].level - 1, 0, "",
		  \ 'toggle-open FoldColumn','javascript:toggleFold("fold'.s:foldstack[0].id.s:settings.id_suffix.'");')
	  endif
	  " add the filler spaces separately from the '+' char so that it can be
	  " shown/hidden separately during a hover unfold
	  let s:new = s:new . s:FoldColumn_build("+", 1, 0, "",
		\ 'toggle-open FoldColumn', 'javascript:toggleFold("fold'.s:foldId.s:settings.id_suffix.'");')
	  " If this is not the last fold we're opening on this line, we need
	  " to keep the filler spaces hidden if the fold is opened by mouse
	  " hover. If it is the last fold to open in the line, we shouldn't hide
	  " them, so don't apply the toggle-filler class.
	  let s:new = s:new . s:FoldColumn_build(" ", 1, s:foldcolumn - s:allfolds[0].level - 1, "",
		\ 'toggle-open FoldColumn'. (get(s:allfolds, 1, {'firstline': 0}).firstline == s:lnum ?" toggle-filler" :""),
		\ 'javascript:toggleFold("fold'.s:foldId.s:settings.id_suffix.'");')

	  " add fold column that can close the new fold
	  " only add extra blank space if we aren't opening another fold on the
	  " same line
	  if get(s:allfolds, 1, {'firstline': 0}).firstline != s:lnum
	    let s:extra_space = s:foldcolumn - s:allfolds[0].level
	  else
	    let s:extra_space = 0
	  endif
	  if s:firstfold
	    " the first fold in a line has '|' characters from folds opened in
	    " previous lines, before the '-' for this fold
	    let s:new .= s:FoldColumn_build('|', s:allfolds[0].level - 1, s:extra_space, '-',
		  \ 'toggle-closed FoldColumn', 'javascript:toggleFold("fold'.s:foldId.s:settings.id_suffix.'");')
	  else
	    " any subsequent folds in the line only add a single '-'
	    let s:new = s:new . s:FoldColumn_build("-", 1, s:extra_space, "",
		  \ 'toggle-closed FoldColumn', 'javascript:toggleFold("fold'.s:foldId.s:settings.id_suffix.'");')
	  endif
	  let s:firstfold = 0
	endif

	" Add fold text, moving the span ending to the next line so collapsing
	" of folds works correctly.
	" Put numcol in a separate group for sake of unselectable text.
	let s:new = s:new . (s:settings.number_lines ? s:HtmlFormat_n(s:numcol, s:FOLDED_ID, 0, 0) : "") . substitute(s:HtmlFormat_t(foldtextresult(s:lnum), s:FOLDED_ID, 0), '', s:HtmlEndline.'\n\0', '')
	let s:new = s:new . ""

	" open the fold now that we have the fold text to allow retrieval of
	" fold text for subsequent folds
	execute s:lnum."foldopen"
	call insert(s:foldstack, remove(s:allfolds,0))
	let s:foldstack[0].id = s:foldId
      endwhile

      " Unless disabled, add a fold column for other lines.
      "
      " Note that dynamic folds require using css so we just use css to take
      " care of the leading spaces rather than using   in the case of
      " html_no_pre to make it easier
      if !s:settings.no_foldcolumn
	if empty(s:foldstack)
	  " add the empty foldcolumn for unfolded lines if there is a fold
	  " column at all
	  if s:foldcolumn > 0
	    let s:new = s:new . s:FoldColumn_fill()
	  endif
	else
	  " add the fold column for folds not on the opening line
	  if get(s:foldstack, 0).firstline < s:lnum
	    let s:new = s:new . s:FoldColumn_build('|', s:foldstack[0].level, s:foldcolumn - s:foldstack[0].level, "",
		  \ 'FoldColumn', 'javascript:toggleFold("fold'.s:foldstack[0].id.s:settings.id_suffix.'");')
	  endif
	endif
      endif
    endif

    " Now continue with the unfolded line text
    if s:settings.number_lines
      let s:new = s:new . s:HtmlFormat_n(s:numcol, s:LINENR_ID, 0, s:lnum)
    elseif s:settings.line_ids
      let s:new = s:new . s:HtmlFormat_n("", s:LINENR_ID, 0, s:lnum)
    endif

    " Get the diff attribute, if any.
    let s:diffattr = diff_hlID(s:lnum, 1)

    " initialize conceal info to act like not concealed, just in case
    let s:concealinfo = [0, '']

    " Loop over each character in the line
    let s:col = 1

    " most of the time we won't use the diff_id, initialize to zero
    let s:diff_id = 0

    while s:col <= s:len || (s:col == 1 && s:diffattr)
      let s:startcol = s:col " The start column for processing text
      if !s:settings.ignore_conceal && has('conceal')
	let s:concealinfo = synconcealed(s:lnum, s:col)
      endif
      if !s:settings.ignore_conceal && s:concealinfo[0]
	let s:col = s:col + 1
	" Speed loop (it's small - that's the trick)
	" Go along till we find a change in the match sequence number (ending
	" the specific concealed region) or until there are no more concealed
	" characters.
	while s:col <= s:len && s:concealinfo == synconcealed(s:lnum, s:col) | let s:col = s:col + 1 | endwhile
      elseif s:diffattr
	let s:diff_id = diff_hlID(s:lnum, s:col)
	let s:id = synID(s:lnum, s:col, 1)
	let s:col = s:col + 1
	" Speed loop (it's small - that's the trick)
	" Go along till we find a change in hlID
	while s:col <= s:len && s:id == synID(s:lnum, s:col, 1)
	      \   && s:diff_id == diff_hlID(s:lnum, s:col) |
	      \     let s:col = s:col + 1 |
	      \ endwhile
	if s:len < &columns && !s:settings.no_pre
	  " Add spaces at the end of the raw text line to extend the changed
	  " line to the full width.
	  let s:line = s:line . repeat(' ', &columns - virtcol([s:lnum, s:len]) - s:margin)
	  let s:len = &columns
	endif
      else
	let s:id = synID(s:lnum, s:col, 1)
	let s:col = s:col + 1
	" Speed loop (it's small - that's the trick)
	" Go along till we find a change in synID
	while s:col <= s:len && s:id == synID(s:lnum, s:col, 1) | let s:col = s:col + 1 | endwhile
      endif

      if s:settings.ignore_conceal || !s:concealinfo[0]
	" Expand tabs if needed
	let s:expandedtab = strpart(s:line, s:startcol - 1, s:col - s:startcol)
	if s:settings.expand_tabs
	  let s:offset = 0
	  let s:idx = stridx(s:expandedtab, "\t")
	  let s:tablist = split(&vts,',')
	  if empty(s:tablist)
	    let s:tablist = [ &ts ]
	  endif
	  let s:tabidx = 0
	  let s:tabwidth = 0
	  while s:idx >= 0
	    if s:startcol + s:idx == 1
	      let s:i = s:tablist[0]
	    else
	      " Get the character, which could be multiple bytes, which falls
	      " immediately before the found tab. Extract it by matching a
	      " character just prior to the column where the tab matches.
	      " We'll use this to get the byte index of the character
	      " immediately preceding the tab, so we can then look up the
	      " virtual column that character appears in, to determine how
	      " much of the current tabstop has been used up.
	      if s:idx == 0
		" if the found tab is the first character in the text being
		" processed, we need to get the character prior to the text,
		" given by startcol.
		let s:prevc = matchstr(s:line, '.\%' . (s:startcol + s:offset) . 'c')
	      else
		" Otherwise, the byte index of the tab into s:expandedtab is
		" given by s:idx.
		let s:prevc = matchstr(s:expandedtab, '.\%' . (s:idx + 1) . 'c')
	      endif
	      let s:vcol = virtcol([s:lnum, s:startcol + s:idx + s:offset - len(s:prevc)])

	      " find the tabstop interval to use for the tab we just found. Keep
	      " adding tabstops (which could be variable) until we would exceed
	      " the virtual screen position of the start of the found tab.
	      while s:vcol >= s:tabwidth + s:tablist[s:tabidx]
		let s:tabwidth += s:tablist[s:tabidx]
		if s:tabidx < len(s:tablist)-1
		  let s:tabidx = s:tabidx+1
		endif
	      endwhile
	      let s:i = s:tablist[s:tabidx] - (s:vcol - s:tabwidth)
	    endif
	    " update offset to keep the index within the line corresponding to
	    " actual tab characters instead of replaced spaces; s:idx reflects
	    " replaced spaces in s:expandedtab, s:offset cancels out all but
	    " the tab character itself.
	    let s:offset -= s:i - 1
	    let s:expandedtab = substitute(s:expandedtab, '\t', repeat(' ', s:i), '')
	    let s:idx = stridx(s:expandedtab, "\t")
	  endwhile
	end

	" get the highlight group name to use
	let s:id = synIDtrans(s:id)
      else
	" use Conceal highlighting for concealed text
	let s:id = s:CONCEAL_ID
	let s:expandedtab = s:concealinfo[1]
      endif

      " Output the text with the same synID, with class set to the highlight ID
      " name, unless it has been concealed completely.
      if strlen(s:expandedtab) > 0
	let s:new = s:new . s:HtmlFormat(s:expandedtab,  s:id, s:diff_id, "", 0)
      endif
    endwhile
  endif

  call extend(s:lines, split(s:new.s:HtmlEndline, '\n', 1))
  if !s:settings.no_progress && s:pgb.needs_redraw
    redrawstatus
    let s:pgb.needs_redraw = 0
  endif
  let s:lnum = s:lnum + 1

  if !s:settings.no_progress
    call s:pgb.incr()
  endif
endwhile

if s:settings.dynamic_folds
  " finish off any open folds
  while !empty(s:foldstack)
    let s:lines[-1].=""
    call remove(s:foldstack, 0)
  endwhile

  " add fold column to the style list if not already there
  let s:id = s:FOLD_C_ID
  if !has_key(s:stylelist, s:id)
    let s:stylelist[s:id] = '.FoldColumn { ' . s:CSS1(s:id) . '}'
  endif
endif

if s:settings.no_pre
  if !s:settings.use_css
    " Close off the font tag that encapsulates the whole 
    call extend(s:lines, ["", "", ""])
  else
    call extend(s:lines, ["