Massive CtrlP improvements

vim/rc/plugins/ctrlp.rc.vim

@@ -8,13 +8,27 @@ let g:ctrlp_map = '<C-t>'
 let g:ctrlp_reuse_window = 'startify'
 " Support tag jumping
 let g:ctrlp_extensions = ['tag', 'buffertag']
-" Support Apex language
+" Don't search right away
+let g:ctrlp_lazy_update = 100
+" Quick exiting with <bs>
+let g:ctrlp_brief_prompt = 1
+" Support golang tags
 let g:ctrlp_buftag_types = {
         \ 'go'    : {
             \ 'bin' : 'gotags',
             \ 'args' : '-sort -silent',
         \}
     \}
+" When using slow built in search, limit max depth
+let g:ctrlp_max_depth = 4
+" When using slow built in search, limit max files
+let g:ctrlp_max_files = 1000
+" Use git ls-files when in a git project
+let g:ctrlp_user_command = {
+        \ 'types': {
+            \ 1: ['.git', 'cd %s && git ls-files'],
+        \}
+    \}
 " Leader Commands
 nnoremap <leader>b :CtrlPBuffer<CR>
 nnoremap <leader>t :CtrlPBufTag<CR>
@@ -25,7 +39,7 @@ nnoremap <leader>m :CtrlPMRUFiles<CR>
 " Special stuff for The Silver Searcher
 if executable('ag')
     " use ag for CtrlP
-    let g:ctrlp_user_command = 'ag %s -l --nocolor --nogroup -g ""'
+    let g:ctrlp_user_command['fallback'] = 'ag %s -l --depth 5 --nocolor --nogroup -g ""'
     " ag is fast enough we don't need cache
     let g:ctrlp_use_caching = 0
 endif