add obsession extension

autoload/airline/extensions/obsession.vim

@@ -0,0 +1,20 @@
+" vim: et ts=2 sts=2 sw=2
+
+if !exists('*ObsessionStatus')
+  finish
+endif
+
+let s:spc = g:airline_symbols.space
+
+if !exists('g:airline#extensions#obsession#indicator_text')
+  let g:airline#extensions#obsession#indicator_text = '$'
+endif
+
+function! airline#extensions#obsession#init(ext)
+  call airline#parts#define_function('obsession', 'airline#extensions#obsession#get_status')
+endfunction
+
+function! airline#extensions#obsession#get_status()
+  return ObsessionStatus((g:airline#extensions#obsession#indicator_text . s:spc), '')
+endfunction
+