当我使用company候选的时候，TAB键同时是yasnippet的yas-expand和yas-next-field，也是company 的company-complete-common。经常在我选择yas-expand时便直接给我弹出候选了。尤其是启动tabnine后的强大的fuzzy search，必须C-g关闭候选再输入TAB进行yas-expand，非常烦。
我在论坛找了找，最接近理想的答案是这个 ，但这个的问题是直接把company-active-map的TAB改成yas-expand了，我还是希望保留company-complete-common的，于是自己写了一个function：
(defun smarter-yas-expand-next-field-complete ()
"Try to `yas-expand' and `yas-next-field' at current cursor position.
If failed try to complete the common part with `company-complete-common'"
(interactive)
(if yas-minor-mode
(let ((old-point (point))
(old-tick (buffer-chars-modified-tick)))
(yas-expand)
(when (and (eq old-point (point))
(eq old-tick (buffer-chars-modified-tick)))
(ignore-errors (yas-next-field))
(when (and (eq old-point (point))
(eq old-tick (buffer-chars-modified-tick)))
(company-complete-common))))
(company-complete-common)))
这样，在出现company候选时，TAB键优先判断是不是snippet的缩写，然后判断可不可以snippet-next-field，最后才通过company-complete-common尝试补全。
绑定：
(with-eval-after-load 'company
(define-key company-active-map [tab] #'yas-expand)
(define-key company-active-map (kbd "TAB") #'yas-expand))
use-package:
(use-package company
...
:bind
(:map company-active-map
([tab] . smarter-yas-expand-next-field-complete)
("TAB" . smarter-yas-expand-next-field-complete))...)
大家可参考：
4 个赞
太麻烦了 还得按个tab
(setq company-backends
'((:separate company-yasnippet company-capf) )
Grouped backends
================
An element of `company-backends' can also be a list of backends. The
completions from backends in such groups are merged, but only from those
backends which return the same `prefix'.
If a backend command takes a candidate as an argument (e.g. `meta'), the
call is dispatched to the backend the candidate came from. In other
cases (except for `duplicates' and `sorted'), the first non-nil value among
all the backends is returned.
The group can also contain keywords. Currently, `:with' and `:separate'
keywords are defined. If the group contains keyword `:with', the backends
listed after this keyword are ignored for the purpose of the `prefix'
command. If the group contains keyword `:separate', the candidates that
come from different backends are sorted separately in the combined list.
cireu
2019 年9 月 20 日 08:13
3
别人是在yasnippet field里启动company，想用tab在company移动候选项时。产生冲突要改键，你这个是什么玩意
哦 理解错了 没怎么用过yasnippet里的$1
如果是想在yas展开的过程中company
我觉得绑定空格键挺好的 如果必须要输入点什么 空格可以代表不输入 也就不会冲突了
spacemacs使用空格说明是有好处的
如果你用company补全yas 还会有这个问题吗？
emmm 我回头看看company-yasnippet怎么样
我现在不用的一个原因是我已经tabnine+lsp一起用了，company显示的东西已经够多了。。。
我曾经用过TAB同时处理三种（yas-expand, auto-complete, indent)，后来不用了，你参考下：
(你用时把auto-complete替换为company-complete-common就好了， auto-completion是company类似的老包。)
;;
;; Integration of "indent" + /auto-complete/ + /yas/
;;
(defun check-expansion ()
(save-excursion
(if (looking-at "\\_>") t
(backward-char 1)
(if (looking-at "\\.") t
(backward-char 1)
(if (looking-at "->") t nil)))))
(defun do-yas-expand ()
(let ((yas/fallback-behavior 'return-nil))
(yas-expand)))
(defun tab-indent-or-complete ()
(interactive)
(if (minibufferp)
(minibuffer-complete)
(if (or (not yas/minor-mode)
(null (do-yas-expand)))
(if (check-expansion)
(auto-complete)
(indent-for-tab-command)))))
(if (display-graphic-p)
(global-set-key (kbd "<tab>") 'tab-indent-or-complete)
;; <tab> is not available in terminal, "TAB" is used instead
(global-set-key (kbd "TAB") 'tab-indent-or-complete))