detect lazyredraw and handle accordingly

README.md

@@ -8,10 +8,9 @@ there's already [powerline][b], why yet another statusline?
 
 *  it's standard vimscript, no python needed
 *  it's small.  i want the entire plugin to be less than 200 lines as a rule
-*  gets you 90% of the way there: in addition to all the standard goodies, supports [fugitive](https://github.com/tpope/vim-fugitive) and [syntastic](https://github.com/scrooloose/syntastic)
-*  integration with [vim-bufferline](https://github.com/bling/vim-bufferline)
-*  looks good with regular fonts, with support to use powerline font glyths
-*  it's fast to load.  since it's so small, it only takes 0.5ms to load.  by comparison, powerline needs 60ms on the same machine.
+*  it gets you 90% of the way there; in addition to all the standard goodies, it integrates with [vim-bufferline][f], [fugitive][d], and [syntastic][e]
+*  it looks good with regular fonts, and provides configuration points so you can use unicode or powerline symbols
+*  it's fast to load, taking only 0.5ms.  by comparison, powerline needs 60ms on the same machine.
 
 # why's it called airline?
 
@@ -26,11 +25,10 @@ i wrote this on an airplane, and since it's light as air it turned out to be a g
 1.  the powerline font symbols are not showing up
   *  the older deprecated [vim-powerline][a] uses different codes compared to the newer [powerline][b].
   *  you can grab prepatched fonts at [powerline-fonts][c], or you can manually set the relevant `g:` variables
-2.  leaving insert mode does not update the statusline
+2.  there is a pause when leaving insert mode
   *  you need to set `ttimeoutlen` to a low number; 50 is recommended
 3.  the colors don't change
-  *  you need `set lazyredraw` and `set t_Co=256` in your vimrc
-  *  if you know why these settings affect colors, i'd love to know the reason!
+  *  ensure that `set t_Co=256` is set in your vimrc
 
 # screenshots
 
@@ -53,3 +51,6 @@ contributions and pull requests are welcome.
 [a]: https://github.com/Lokaltog/vim-powerline
 [b]: https://github.com/Lokaltog/powerline
 [c]: https://github.com/Lokaltog/powerline-fonts
+[d]: https://github.com/tpope/vim-fugitive
+[e]: https://github.com/scrooloose/syntastic
+[f]: https://github.com/bling/vim-bufferline

plugin/airline.vim

@@ -132,4 +132,9 @@ augroup airline
   autocmd WinLeave * call <sid>update_statusline(0)
   autocmd VimEnter,WinEnter,BufWinEnter * call <sid>update_statusline(1)
   autocmd ColorScheme * hi clear StatusLine | hi clear StatusLineNC
+
+  " if you know why lazyredraw affects statusline rendering i'd love to know!
+  if !&lazyredraw
+    autocmd InsertLeave * :redrawstatus
+  endif
 augroup END