update simple theme to take full advantage of powerline symbols

autoload/airline.vim

@@ -79,7 +79,7 @@ function! airline#update_statusline(active)
   let sl.= a:active
         \ ? '%{airline#update_highlight()} '.s:get_section('a').' %{g:airline_paste_detection && &paste ? g:airline_paste_symbol." " : ""}'
         \ : '        %#Al9#'
-  let sl.=l:mode_sep_color.'%{g:airline_left_sep}'.l:info_color
+  let sl.=l:mode_sep_color.g:airline_left_sep.l:info_color
   let sl.=' '.s:get_section('b').' '
   let sl.=l:info_sep_color.g:airline_left_sep
   let sl.=a:active ? l:status_color.' '.s:get_section('c').' ' : ' '.bufname(winbufnr(winnr()))

autoload/airline/themes/simple.vim

@@ -1,18 +1,44 @@
+let s:powerline = 0
 if exists('g:airline_powerline_fonts') && g:airline_powerline_fonts
-  let g:airline_left_sep = ''
+  let s:powerline = 1
-  let g:airline_right_sep = ''
+
+  let s:left = 0
+  function! airline#themes#simple#left()
+    if s:left == 1
+      let s:left = 0
+      return ''
+    else
+      let s:left = 1
+      return ''
+    endif
+  endfunction
+  let g:airline_left_sep = '%{airline#themes#simple#left()}'
+
+  let s:right = 0
+  function! airline#themes#simple#right()
+    if s:right == 1
+      let s:right = 0
+      return ''
+    else
+      let s:right = 1
+      return ''
+    endif
+  endfunction
+  let g:airline_right_sep = '%{airline#themes#simple#right()}'
 endif
 
 let s:bg = 232
 let s:sepc = 236
 let s:sepg = '#303030'
 
-let s:N1 = [ '#00dfff' , '#080808' , 45  , s:bg ]
+let s:N1 = s:powerline ? [ '#080808' , '#00dfff' , s:bg , 45 ] : [ '#00dfff' , '#080808' , 45 , s:bg ]
 let s:N2 = [ '#ff5f00' , '#080808' , 202 , s:bg ]
 let s:N3 = [ '#767676' , '#080808' , 243 , s:bg ]
 let g:airline#themes#simple#normal = {
       \ 'mode':           [ s:N1[0]   , s:N1[1]   , s:N1[2] , s:N1[3] , 'bold' ] ,
-      \ 'mode_separator': [ s:sepg    , s:N2[1]   , s:sepc  , s:N2[3] , 'bold' ] ,
+      \ 'mode_separator': s:powerline
+                      \ ? [ '#00dfff' , s:N2[1]   , 45      , s:N2[3] , 'bold' ]
+                      \ : [ s:sepg    , s:N2[1]   , s:sepc  , s:N2[3] , 'bold' ] ,
       \ 'info':           [ s:N2[0]   , s:N2[1]   , s:N2[2] , s:N2[3] , ''     ] ,
       \ 'info_separator': [ s:sepg    , s:N3[1]   , s:sepc  , s:N3[3] , 'bold' ] ,
       \ 'statusline':     [ s:N3[0]   , s:N3[1]   , s:N3[2] , s:N3[3] , ''     ] ,
@@ -23,24 +49,28 @@ let g:airline#themes#simple#normal_modified = {
       \ 'statusline':     [ '#df0000' , '#080808' , 160     , s:bg    , ''     ] ,
       \ }
 
-let s:I1 = [ '#5fff00' , '#080808' , 82  , s:bg ]
+let s:I1 = s:powerline ? [ '#080808' , '#5fff00' , s:bg , 82 ] : [ '#5fff00' , '#080808' , 82 , s:bg ]
 let s:I2 = [ '#ff5f00' , '#080808' , 202 , s:bg ]
 let s:I3 = [ '#767676' , '#080808' , 243 , s:bg ]
 let g:airline#themes#simple#insert = {
       \ 'mode':           [ s:I1[0]   , s:I1[1] , s:I1[2] , s:I1[3] , 'bold' ] ,
-      \ 'mode_separator': [ s:sepg  , s:I2[1] , s:sepc  , s:I2[3] , 'bold' ] ,
+      \ 'mode_separator': s:powerline
+                      \ ? [ '#5fff00' , s:I2[1] , 82      , s:I2[3] , 'bold' ]
+                      \ : [ s:sepg    , s:I2[1] , s:sepc  , s:I2[3] , 'bold' ] ,
       \ 'info':           [ s:I2[0]   , s:I2[1] , s:I2[2] , s:I2[3] , ''     ] ,
       \ 'info_separator': [ s:sepg    , s:I3[1] , s:sepc  , s:I3[3] , 'bold' ] ,
       \ 'statusline':     [ s:I3[0]   , s:I3[1] , s:I3[2] , s:I3[3] , ''     ] ,
       \ }
 let g:airline#themes#simple#insert_modified = copy(g:airline#themes#simple#normal_modified)
 
-let s:V1 = [ '#dfdf00' , '#080808' , 184 , s:bg ]
+let s:V1 = s:powerline ? [ '#080808' , '#dfdf00' , s:bg , 184 ] : [ '#dfdf00' , '#080808' , 184 , s:bg ]
 let s:V2 = [ '#ff5f00' , '#080808' , 202 , s:bg ]
 let s:V3 = [ '#767676' , '#080808' , 243 , s:bg ]
 let g:airline#themes#simple#visual = {
       \ 'mode':           [ s:V1[0]   , s:V1[1] , s:V1[2] , s:V1[3] , 'bold' ] ,
-      \ 'mode_separator': [ s:sepg  , s:V2[1] , s:sepc  , s:V2[3] , 'bold' ] ,
+      \ 'mode_separator': s:powerline
+                      \ ? [ 'dfdf00'  , s:V2[1] , 184     , s:V2[3] , 'bold' ]
+                      \ : [ s:sepg    , s:V2[1] , s:sepc  , s:V2[3] , 'bold' ] ,
       \ 'info':           [ s:V2[0]   , s:V2[1] , s:V2[2] , s:V2[3] , ''     ] ,
       \ 'info_separator': [ s:sepg    , s:V3[1] , s:sepc  , s:V3[3] , 'bold' ] ,
       \ 'statusline':     [ s:V3[0]   , s:V3[1] , s:V3[2] , s:V3[3] , ''     ] ,