" Rename tabs to show tab number.
" based on:
" http://stackoverflow.com/questions/5927952/whats-implementation-of-vims-default-tabline-function

function! MyTabLine() "{{{
  let l:customtabline = ''
  let l:currenttabnum = tabpagenr()
  let l:lasttabnumber = tabpagenr('$')
  let l:tabnumber = 1
  while l:tabnumber <= l:lasttabnumber
    let l:buflist = tabpagebuflist(l:tabnumber)
    let l:winnr = tabpagewinnr(l:tabnumber)

    if l:lasttabnumber > 1
      let l:customtabline .= '%' . l:tabnumber . 'T'
      let l:customtabline .= (l:tabnumber == l:currenttabnum ? '%1*' : '%2*')

      let l:customtabline .= (l:tabnumber == l:currenttabnum ? '%#TabLineNumSel#' : '%#TabLineNum#')
      let l:customtabline .= ' ' . l:tabnumber . ' '
      let l:customtabline .= (l:tabnumber == l:currenttabnum ? '%#TabLineItemSel#' : '%#TabLineItem#')
    endif

    let l:bufnr = l:buflist[l:winnr - 1]
    let l:file = bufname(l:bufnr)
    let l:buftype = getbufvar(l:bufnr, '&buftype')

    if l:buftype ==# 'help'
      let l:file = 'help:' . fnamemodify(l:file, ':t:r')

    elseif l:buftype ==# 'quickfix'
      let l:file = 'quickfix'

    elseif l:buftype ==# 'nofile'
      if l:file =~# '\/.'
        let l:file = substitute(l:file, '.*\/\ze.', '', '')
      endif

    else
      let l:file = fnamemodify(l:file, ':p:t')

    endif

    if l:file ==# ''
      let l:file = "''"
    endif

    let l:customtabline .= l:file . '  '

    let l:tabnumber = l:tabnumber + 1

  endwhile

  let l:customtabline .= '%T%#TabLineFill#%='

  if exists('*gutentags#statusline')
    let l:customtabline .= '%#TabLineItemSel# %{gutentags#statusline("[ ", " ☢ ]  ")}'
  endif
  let l:customtabline .= '%#TabLineItem# %{getcwd()}%   '
  if exists('*fugitive#statusline')
    let l:customtabline .= '%#TabLineItem# %{fugitive#statusline()}%   '
  endif
  if exists('*ObsessionStatus')
    let l:customtabline .= "%#TabLineItemSel# %{ObsessionStatus(fnamemodify(v:this_session,':t'),'---')} %*"
  endif

  return l:customtabline

endfunction
"}}}

set tabline=%!MyTabLine()

hi def link TabLineItem TabLine
hi def link TabLineItemSel TabLineSel
hi def link TabLineNum TabLine
hi def link TabLineNumSel TabLineSel