vim-ezbar-setting.vim

  let g:ezbar = {'separator_L': '', 'separator_R': ''}
  let g:ezbar.active = [
    \ 'winbufnum', 'dir',
    \ 'filename',
    \ {'chg_color': {'gui': ['SlateGray', 'white', 'bold']}},
    \ 'filetype',
    \ 'modified',
    \ 'currentfuncrow',
    \ {'__SEP__': 'StatusLine'},
    \ 'cfi',
    \ 'fileformat',
    \ 'encoding',
    \ 'percent',
    \ 'line_col',
    \ ]
  let g:ezbar.inactive = [
    \ 'winbufnum', 'dir',
    \ 'filename',
    \ {'chg_color': 'StlProperty'},
    \ 'filetype',
    \ 'modified',
    \ {'__SEP__': 'StatusLine'},
    \ 'SEP',
    \ 'encoding',
    \ 'percent',
    \ 'line_col',
    \ ]

  let s:u = {}
  function! s:u._init(n) "{{{
    let self.mode = mode()
    let self.crrbuf = bufname(winbufnr(a:n))
    if self.__is_active && self.mode == 'i'
      let self.__default_color = {'gui': ['DarkKhaki', 'black', 'bold']}
    end
  endfunction
  "}}}
  function! s:u._filter(layout, parts) "{{{
    if self.mode == 'i'
      let a:parts.__SEP__.ac = {'gui': ['DarkKhaki', 'black', 'bold']}
    end
    let a:parts.line_col.ac = {'gui': ['NavajoWhite1', 'black', 'bold']}
    let a:parts.line_col.c = {'gui': ['NavajoWhite1', 'black']}
    "let a:layout[-1].ac = {'gui': ['NavajoWhite1', 'black', 'bold']}
    "let a:layout[-1].c = {'gui': ['NavajoWhite1', 'black']}
    let a:layout[-2].ac = {'gui': ['MistyRose', 'black', 'bold']}
    let a:layout[-2].c = {'gui': ['MistyRose', 'black']}
    return a:layout
  endfunction
  "}}}
  function! s:u.winbufnum(n) "{{{
    return '%n%{repeat(",", winnr())}%<'
  endfunction
  "}}}
  function! s:u.dir(n) "{{{
    let bg = self.mode=='i' ? 'LightSkyBlue1' : 'azure'
    let _ = fnamemodify(self.crrbuf, ':h')
    return {'s': '%.35('._.'%)', 'ac': {'gui': [bg, 'black', 'bold']}, 'ic': {'gui': ['azure', 'black']}}
  endfunction
  "}}}
  function! s:u.filename(n) "{{{
    let bg = self.mode=='i' ? 'RosyBrown1' : 'MistyRose'
    return {'s': fnamemodify(self.crrbuf, ':t'), 'ac': {'gui': [bg, 'black', 'bold']}, 'c': {'gui': ['MistyRose', 'black']}}
  endfunction
  "}}}
  function! s:u.currentfuncrow(n) "{{{
    if &ft != 'vim'
      return ''
    end
    let funcbgn = search('^\s*\<fu\%[nction]\>', 'bcnW', search('^\s*\<endf\%[unction]\>', 'bcnW'))
    if funcbgn > 0
      let row = line('.') - funcbgn
      return row ? {'s': row, 'c': {'gui': ['azure', 'black', 'bold']}} : ''
    endif
    return ''
  endfunction
  "}}}
  function! s:u.cfi(n) "{{{
    if exists('*cfi#format')
      return {'s': cfi#format('%.43s()', ''), 'c': {'gui': ['azure', 'black', 'bold']}}
    end
    return ''
  endfunction
  "}}}

  let g:ezbar.parts = extend(s:u, ezbar#parts#default#new(), 'keep')
  unlet s:u

function 情報とるの良さそうですね。
ちなみに、設定方法はかなり自由度があって、こういうこともできます。

https://github.com/t9md/vim-ezbar/blob/master/misc/config_sample/color_theme_and_layout.vim