Commandline autocomplete filter

examples.md

@@ -204,3 +204,40 @@ command! FZFMru call fzf#run({
             \'options' : '-m',
             \})
 ```
+
+Fuzzy cmdline completion
+---
+
+```vimL
+cnoremap <silent> <c-l> <c-\>eGetCompletions()<cr>
+
+function! Lister()
+    call extend(g:FZF_Cmd_Completion_Pre_List,split(getcmdline(),' '))
+endfunction
+
+function! GetCompletions()
+    let g:FZF_Cmd_Completion_Pre_List = []
+    let l:cmdline_list = split(getcmdline(), ' ', 1)
+    let l:Prefix = l:cmdline_list[0:-2]
+    execute "silent normal! :" . getcmdline() . "\<c-a>\<c-\>eLister()\<cr>\<c-c>"
+    let l:FZF_Cmd_Completion_List = g:FZF_Cmd_Completion_Pre_List[len(l:Prefix):-1]
+    unlet g:FZF_Cmd_Completion_Pre_List
+    if len(l:Prefix) > 0 && (
+                    \  (l:Prefix[0] == 'e')    ||
+                    \  (l:Prefix[0] == 'tabe') ||
+                    \  (l:Prefix[0] == 'vs')   ||
+                    \  (l:Prefix[0] == 'sp')
+                    \)
+        return join(l:Prefix + fzf#run({
+                    \'options': '-m --select-1 --query='.l:cmdline_list[-1]
+                    \}))
+    else 
+        return join(l:Prefix + fzf#run({
+                    \'source':l:FZF_Cmd_Completion_List, 
+                    \'options': '--select-1 --query='.l:cmdline_list[-1]
+                    \}))
+    endif
+endfunction
+```
+
+hit `<c-l>` while in the ex commandline (i.e. after pressing `:`) to have fzf filter a list of vim's commandline auto-completions. Try `:colo␣<c-l>` (be sure to include the space) or `:b␣<c-l>`. There are special cases for handling file-searches, so that you can go deeper into the directory than just one layer. More special cases could be added. Some limitations: the auto-complete for `:help` and `:tag` are limited to 300 entries, so you may need to narrow it a bit.