Update and simplify statusline in vimrc

.vimrc

@@ -136,7 +136,7 @@ Plug 'vim-airline/vim-airline-themes'
 Plug 'junegunn/fzf', { 'do': { -> fzf#install() } }
 Plug 'junegunn/fzf.vim'
 Plug 'airblade/vim-rooter'
-Plug 'bling/vim-bufferline'
+"Plug 'bling/vim-bufferline'
 Plug 'majutsushi/tagbar'
 Plug 'SirVer/ultisnips'
 Plug 'honza/vim-snippets'
@@ -471,6 +471,7 @@ let g:fzf_preview_window = ''
 
 " * Airline
 set noshowmode
+let g:airline_section_c = '%{StatuslineGit()}'
 let g:airline#extensions#branch#enabled = 1
 let g:airline#extensions#syntastic#enabled = 1
 let g:airline#extensions#tagbar#enabled = 1
@@ -704,6 +705,12 @@ function AutoTrimWhitespace()
   endif
 endfunction
 
+
+function! StatuslineGit()
+  let l:root = finddir('.git/..', expand('%:p:h').';')
+  return expand('%:p:s!'. l:root . '!/!')
+endfunction
+
 function InstallEverything()
   GoUpdateBinaries
   BlackUpgrade