Allow fzf#complete to take hash argument with sink

This allows us to use the return value of fzf#wrap function with
fzf#complete.

This commit also removes obsolete g:fzf#vim#default_layout and
fzf#vim#layout.

README.md

@@ -245,7 +245,7 @@ following exceptions:
     - Or a function to extract completion prefix
 - Both `source` and `options` can be given as funcrefs that take the
   completion prefix as the argument and return the final value
-- `sink` or `sink*` are not allowed
+- `sink` or `sink*` are ignored
 
 #### Reducer example
 

autoload/fzf/vim.vim

@@ -82,11 +82,6 @@ function! fzf#vim#wrap(opts)
   return fzf#wrap(a:opts)
 endfunction
 
-" Deprecated
-function! fzf#vim#layout(...)
-  return (a:0 && a:1) ? {} : copy(get(g:, 'fzf_layout', g:fzf#vim#default_layout))
-endfunction
-
 function! s:wrap(name, opts, bang)
   " fzf#wrap does not append --expect if sink or sink* is found
   let opts = copy(a:opts)
@@ -1164,16 +1159,20 @@ endfunction
 
 function! fzf#vim#complete(...)
   if a:0 == 0
-    let s:opts = g:fzf#vim#default_layout
+    let s:opts = fzf#wrap()
   elseif type(a:1) == s:TYPE.dict
-    if has_key(a:1, 'sink') || has_key(a:1, 'sink*')
-      echoerr 'sink not allowed'
-      return ''
-    endif
     let s:opts = copy(a:1)
+  elseif type(a:1) == s:TYPE.string
+    let s:opts = extend({'source': a:1}, get(a:000, 1, fzf#wrap()))
   else
-    let s:opts = extend({'source': a:1}, g:fzf#vim#default_layout)
+    echoerr 'Invalid argument: '.string(a:000)
+    return ''
   endif
+  for s in ['sink', 'sink*']
+    if has_key(s:opts, s)
+      call remove(s:opts, s)
+    endif
+  endfor
 
   let eol = col('$')
   let ve = &ve
@@ -1199,6 +1198,10 @@ function! fzf#vim#complete(...)
     let s:opts.options =
       \ join(filter([get(s:opts, 'options', ''), remove(s:opts, 'extra_options')], '!empty(v:val)'))
   endif
+  if has_key(s:opts, 'options')
+    " FIXME: fzf currently doesn't have --no-expect option
+    let s:opts.options = substitute(s:opts.options, '--expect=[^ ]*', '', 'g')
+  endif
 
   call feedkeys("\<Plug>(-fzf-complete-trigger)")
   return ''

autoload/fzf/vim/complete.vim

@@ -48,7 +48,7 @@ endif
 function! fzf#vim#complete#word(...)
   return fzf#vim#complete(s:extend({
     \ 'source': 'cat /usr/share/dict/words'},
-    \ get(a:000, 0, g:fzf#vim#default_layout)))
+    \ get(a:000, 0, fzf#wrap())))
 endfunction
 
 " ----------------------------------------------------------------------------
@@ -128,7 +128,7 @@ function! fzf#vim#complete#path(command, ...)
   return fzf#vim#complete(s:extend({
   \ 'prefix':  s:function('s:fname_prefix'),
   \ 'source':  s:function('s:file_source'),
-  \ 'options': s:function('s:file_options')}, get(a:000, 0, g:fzf#vim#default_layout)))
+  \ 'options': s:function('s:file_options')}, get(a:000, 0, fzf#wrap())))
 endfunction
 
 " ----------------------------------------------------------------------------
@@ -147,13 +147,13 @@ function! fzf#vim#complete#line(...)
   \ 'prefix':  '^.*$',
   \ 'source':  lines,
   \ 'options': '--tiebreak=index --ansi --nth '.nth.'.. --tabstop=1',
-  \ 'reducer': s:function('s:reduce_line')}, get(a:000, 0, g:fzf#vim#default_layout)))
+  \ 'reducer': s:function('s:reduce_line')}, get(a:000, 0, fzf#wrap())))
 endfunction
 
 function! fzf#vim#complete#buffer_line(...)
   return fzf#vim#complete(s:extend({
   \ 'prefix': '^.*$',
-  \ 'source': fzf#vim#_uniq(getline(1, '$'))}, get(a:000, 0, g:fzf#vim#default_layout)))
+  \ 'source': fzf#vim#_uniq(getline(1, '$'))}, get(a:000, 0, fzf#wrap())))
 endfunction
 
 let &cpo = s:cpo_save

doc/fzf-vim.txt

@@ -274,7 +274,7 @@ following exceptions:
    - Or a function to extract completion prefix
  - Both `source` and `options` can be given as funcrefs that take the completion
    prefix as the argument and return the final value
- - `sink` or `sink*` are not allowed
+ - `sink` or `sink*` are ignored
 
 
 Reducer example~

plugin/fzf.vim

@@ -24,8 +24,6 @@
 let s:cpo_save = &cpo
 set cpo&vim
 
-let g:fzf#vim#default_layout = {'down': '~40%'}
-
 function! s:defs(commands)
   let prefix = get(g:, 'fzf_command_prefix', '')
   if prefix =~# '^[^A-Z]'