shorten inactive windows to only the filename. resolves #35. also, treat inactive as a mode so it can be themed independently.

autoload/airline.vim

@@ -1,6 +1,6 @@
 " vim: ts=2 sts=2 sw=2 fdm=indent
 let s:is_win32term = (has('win32') || has('win64')) && !has('gui_running')
-let s:load_the_theme = g:airline#themes#{g:airline_theme}#normal
+let s:inactive_colors = g:airline#themes#{g:airline_theme}#inactive "also lazy loads the theme
 
 let s:airline_highlight_map = {
       \ 'mode'           : 'Al2',
@@ -9,10 +9,21 @@ let s:airline_highlight_map = {
       \ 'info_separator' : 'Al5',
       \ 'statusline'     : 'Al6',
       \ 'file'           : 'Al7',
-      \ 'inactive'       : 'Al9',
       \ }
 let s:airline_highlight_groups = keys(s:airline_highlight_map)
 
+function! airline#exec_highlight(group, colors)
+  exec printf('hi %s %s %s %s %s %s %s',
+        \ a:group,
+        \ a:colors[0] != '' ? 'guifg='.a:colors[0] : '',
+        \ a:colors[1] != '' ? 'guibg='.a:colors[1] : '',
+        \ a:colors[2] != '' ? 'ctermfg='.a:colors[2] : '',
+        \ a:colors[3] != '' ? 'ctermbg='.a:colors[3] : '',
+        \ a:colors[4] != '' ? 'gui='.a:colors[4] : '',
+        \ a:colors[4] != '' ? 'term='.a:colors[4] : '')
+endfunction
+call airline#exec_highlight('airline_inactive', s:inactive_colors.mode)
+
 function! airline#highlight(modes)
   " always draw the base mode, and then override any/all of the colors with _override
   let mapped = map(a:modes, 'v:val == a:modes[0] ? v:val : a:modes[0]."_".v:val')
@@ -23,14 +34,7 @@ function! airline#highlight(modes)
         if s:is_win32term
           let colors = map(colors, 'v:val != "" && v:val > 128 ? v:val - 128 : v:val')
         endif
-        exec printf('hi %s %s %s %s %s %s %s',
+        call airline#exec_highlight(s:airline_highlight_map[key], colors)
-              \ s:airline_highlight_map[key],
-              \ colors[0] != '' ? 'guifg='.colors[0] : '',
-              \ colors[1] != '' ? 'guibg='.colors[1] : '',
-              \ colors[2] != '' ? 'ctermfg='.colors[2] : '',
-              \ colors[3] != '' ? 'ctermbg='.colors[3] : '',
-              \ colors[4] != '' ? 'gui='.colors[4] : '',
-              \ colors[4] != '' ? 'term='.colors[4] : '')
       endif
     endfor
   endfor
@@ -85,27 +89,29 @@ function! airline#update_statusline(active)
   call airline#update_externals()
   call s:apply_window_overrides()
 
-  let l:mode_color      = a:active ? "%#Al2#" : "%#Al9#"
+  let l:mode_color      = a:active ? "%#Al2#" : "%#airline_inactive#"
-  let l:mode_sep_color  = a:active ? "%#Al3#" : "%#Al9#"
+  let l:mode_sep_color  = a:active ? "%#Al3#" : "%#airline_inactive#"
-  let l:info_color      = a:active ? "%#Al4#" : "%#Al9#"
+  let l:info_color      = a:active ? "%#Al4#" : "%#airline_inactive#"
-  let l:info_sep_color  = a:active ? "%#Al5#" : "%#Al9#"
+  let l:info_sep_color  = a:active ? "%#Al5#" : "%#airline_inactive#"
-  let l:status_color    = a:active ? "%#Al6#" : "%#Al9#"
+  let l:status_color    = a:active ? "%#Al6#" : "%#airline_inactive#"
-  let l:file_flag_color = a:active ? "%#Al7#" : "%#Al9#"
+  let l:file_flag_color = a:active ? "%#Al7#" : "%#airline_inactive#"
 
   let sl = l:mode_color
-  let sl.= a:active
+  if a:active
-        \ ? '%{airline#update_highlight()} '.s:get_section('a').' %{&paste ? g:airline_paste_symbol." " : ""}'
+    let sl.='%{airline#update_highlight()} '.s:get_section('a').' %{&paste ? g:airline_paste_symbol." " : ""}'
-        \ : ' '.s:get_section('a').' %#Al9#'
     let sl.=l:mode_sep_color
     let sl.=a:active ? g:airline_left_sep : g:airline_left_alt_sep
     let sl.=l:info_color
     let sl.=' '.s:get_section('b').' '
     let sl.=l:info_sep_color
-  let sl.=a:active ? g:airline_left_sep : g:airline_left_alt_sep
+    let sl.=g:airline_left_sep
-  let sl.=a:active ? l:status_color.' '.s:get_section('c').' ' : ' '.bufname(winbufnr(winnr()))
+    let sl.=l:status_color.' '.s:get_section('c').' '
-  let sl.=g:airline_section_gutter != ''
+    let sl.=s:get_section('gutter') != ''
-        \ ? g:airline_section_gutter
+          \ ? s:get_section('gutter')
           \ : '%#warningmsg#'.g:airline_externals_syntastic.l:status_color."%<%=".l:file_flag_color."%{&ro ? g:airline_readonly_symbol : ''}".l:status_color
+  else
+    let sl.=' %f%<%='
+  endif
   let sl.=' '.s:get_section('x').' '
   let sl.=l:info_sep_color
   let sl.=a:active ? g:airline_right_sep : g:airline_right_alt_sep

autoload/airline/themes/badwolf.vim

@@ -1,3 +1,5 @@
+let g:airline#themes#badwolf#inactive = { 'mode': [ '#45413b' , '#242321' , 238 , 235 , '' ] }
+
 let s:N1 = [ '#141413' , '#aeee00' , 232 , 154 ]
 let s:N2 = [ '#f4cf86' , '#45413b' , 222 , 238 ]
 let s:N3 = [ '#8cffba' , '#242321' , 121 , 235 ]
@@ -8,14 +10,12 @@ let g:airline#themes#badwolf#normal = {
       \ 'info_separator': [ s:N2[1]    , s:N3[1]   , s:N2[3] , s:N3[3] , 'bold' ] ,
       \ 'statusline':     [ s:N3[0]    , s:N3[1]   , s:N3[2] , s:N3[3] , ''     ] ,
       \ 'file':           [ '#ff2c4b'  , '#242321' , 196     , 235     , ''     ] ,
-      \ 'inactive':       [ '#45413b'  , '#242321' , 238     , 235     , ''     ] ,
       \ }
 let g:airline#themes#badwolf#normal_modified = {
       \ 'mode_separator' : [ '#aeee00' , '#666462' , 154     , 241     , 'bold' ] ,
       \ 'info'           : [ '#f4cf86' , '#666462' , 222     , 241     , ''     ] ,
       \ 'info_separator' : [ '#666462' , '#45413b' , 241     , 238     , 'bold' ] ,
       \ 'statusline'     : [ '#ffa724' , '#45413b' , 214     , 238     , ''     ] ,
-      \ 'inactive'       : [ '#88633f' , '#45413b' , 95      , 238     , ''     ] ,
       \ }
 
 let s:I1 = [ '#141413' , '#0a9dff' , 232 , 39  ]

autoload/airline/themes/dark.vim

@@ -1,3 +1,5 @@
+let g:airline#themes#dark#inactive = { 'mode': [ '#4e4e4e' , '#1c1c1c' , 239 , 234 , '' ] }
+
 let s:N1 = [ '#00005f' , '#dfff00' , 17  , 190 ]
 let s:N2 = [ '#ffffff' , '#444444' , 255 , 238 ]
 let s:N3 = [ '#9cffd3' , '#202020' , 85  , 234 ]
@@ -8,7 +10,6 @@ let g:airline#themes#dark#normal = {
       \ 'info_separator': [ s:N2[1]   , s:N3[1]   , s:N2[3] , s:N3[3] , 'bold' ] ,
       \ 'statusline':     [ s:N3[0]   , s:N3[1]   , s:N3[2] , s:N3[3] , ''     ] ,
       \ 'file':           [ '#ff0000' , '#1c1c1c' , 160     , 233     , ''     ] ,
-      \ 'inactive':       [ '#4e4e4e' , '#1c1c1c' , 239     , 234     , ''     ] ,
       \ }
 let g:airline#themes#dark#normal_modified = {
       \ 'info_separator': [ '#444444' , '#5f005f' , 238     , 53      , ''     ] ,

autoload/airline/themes/light.vim

@@ -1,3 +1,5 @@
+let g:airline#themes#light#inactive = { 'mode': [ '#9e9e9e' , '#ffffff' , 247 , 255 , '' ] }
+
 let s:N1 = [ '#ffffff' , '#005fff' , 255 , 27  ]
 let s:N2 = [ '#000087' , '#00dfff' , 18  , 45  ]
 let s:N3 = [ '#005fff' , '#afffff' , 27  , 159 ]
@@ -8,7 +10,6 @@ let g:airline#themes#light#normal = {
       \ 'info_separator': [ s:N2[1]   , s:N3[1]   , s:N2[3] , s:N3[3] , 'bold' ] ,
       \ 'statusline':     [ s:N3[0]   , s:N3[1]   , s:N3[2] , s:N3[3] , ''     ] ,
       \ 'file':           [ '#df0000' , '#ffffff' , 160     , 255     , ''     ] ,
-      \ 'inactive':       [ '#9e9e9e' , '#ffffff' , 247     , 255     , ''     ] ,
       \ }
 let g:airline#themes#light#normal_modified = {
       \ 'info_separator': [ '#00dfff' , '#ffdfdf' , 45      , 224     , ''     ] ,

autoload/airline/themes/simple.vim

@@ -36,6 +36,8 @@ let s:termbg = 232
 let s:termsep = 236
 let s:guisep = '#303030'
 
+let g:airline#themes#simple#inactive = {'mode': [ '#4e4e4e' , s:guibg , 239 , s:termbg , '' ] }
+
 let s:N1 = s:swap ? [ s:guibg , '#00dfff' , s:termbg , 45 ] : [ '#00dfff' , s:guibg , 45 , s:termbg ]
 let s:N2 = [ '#ff5f00' , s:guibg, 202 , s:termbg ]
 let s:N3 = [ '#767676' , s:guibg, 243 , s:termbg ]
@@ -48,7 +50,6 @@ let g:airline#themes#simple#normal = {
       \ 'info_separator': [ s:guisep  , s:N3[1] , s:termsep , s:N3[3]  , 'bold' ] ,
       \ 'statusline':     [ s:N3[0]   , s:N3[1] , s:N3[2]   , s:N3[3]  , ''     ] ,
       \ 'file':           [ '#ff0000' , s:guibg , 160       , s:termbg , ''     ] ,
-      \ 'inactive':       [ '#4e4e4e' , s:guibg , 239       , s:termbg , ''     ] ,
       \ }
 let g:airline#themes#simple#normal_modified = {
       \ 'statusline':     [ '#df0000' , s:guibg, 160     , s:termbg    , ''     ] ,

autoload/airline/themes/solarized.vim

@@ -1,3 +1,5 @@
+let g:airline#themes#solarized#inactive = { 'mode': [ '#4e4e4e' , '#1c1c1c' , 239 , 234 , '' ] }
+
 let s:N1 = [ '#fdf6e3' , '#657b83' , 230 , 241 ]
 let s:N2 = [ '#fdf6e3' , '#93a1a1' , 230 , 245 ]
 let s:N3 = [ '#657b83' , '#fdf6e3' , 241 , 230 ]
@@ -8,7 +10,6 @@ let g:airline#themes#solarized#normal = {
       \ 'info_separator': [ s:N2[1]   , s:N3[1]   , s:N2[3] , s:N3[3] , 'bold' ] ,
       \ 'statusline':     [ s:N3[0]   , s:N3[1]   , s:N3[2] , s:N3[3] , ''     ] ,
       \ 'file':           [ '#ff0000' , '#1c1c1c' , 160     , 233     , ''     ] ,
-      \ 'inactive':       [ '#4e4e4e' , '#1c1c1c' , 239     , 234     , ''     ] ,
       \ }
 let g:airline#themes#solarized#normal_modified = {
       \ 'info_separator': [ '#444444' , '#5f005f' , 238     , 53      , ''     ] ,