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completion/company: refactor backend resolution

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Makes it easier to change company-backends retrospectively (with a hook
or setq-hook!). Also simplifies how backend defaults are stored (no more
of this :derived and :exact business).

Also updates unit tests.
This commit is contained in:
Henrik Lissner 2019-06-29 01:34:10 +02:00
parent 2f268e80bb
commit 281ea56643
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GPG key ID: 5F6C0EA160557395
2 changed files with 40 additions and 41 deletions
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65
modules/completion/company/autoload.el
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@ -2,9 +2,9 @@
;;;###autoload
(defvar +company-backend-alist
'((text-mode :derived (company-dabbrev company-yasnippet company-ispell))
(prog-mode :derived (:separate company-capf company-yasnippet))
(conf-mode :derived company-capf company-dabbrev-code company-yasnippet))
'((text-mode company-dabbrev company-yasnippet company-ispell)
(prog-mode company-capf company-yasnippet)
(conf-mode company-capf company-dabbrev-code company-yasnippet))
"An alist matching modes to company backends. The backends for any mode is
built from this.")
@ -28,40 +28,37 @@ Examples:
(set-company-backend! '(c-mode c++-mode)
'(:separate company-irony-c-headers company-irony))
(set-company-backend! 'sh-mode nil) ; unsets backends for sh-mode
To have BACKENDS apply to any mode that is a parent of MODES, set MODES to
:derived, e.g.
(set-company-backend! :derived 'text-mode 'company-dabbrev 'company-yasnippet)"
(set-company-backend! 'sh-mode nil) ; unsets backends for sh-mode"
(declare (indent defun))
(let ((type :exact))
(when (eq modes :derived)
(setq type :derived
modes (pop backends)))
(dolist (mode (doom-enlist modes))
(if (null (car backends))
(setq +company-backend-alist
(delq (assq mode +company-backend-alist)
+company-backend-alist))
(setf (alist-get mode +company-backend-alist)
(cons type backends))))))
(dolist (mode (doom-enlist modes))
(if (null (car backends))
(setq +company-backend-alist
(delq (assq mode +company-backend-alist)
+company-backend-alist))
(setf (alist-get mode +company-backend-alist)
backends))))
;;
;;; Library
(defun +company--backends ()
(append (cl-loop for (mode . rest) in +company-backend-alist
for type = (car rest)
for backends = (cdr rest)
if (or (and (eq type :derived) (derived-mode-p mode)) ; parent modes
(and (eq type :exact)
(or (eq major-mode mode) ; major modes
(and (boundp mode)
(symbol-value mode))))) ; minor modes
append backends)
(default-value 'company-backends)))
(let (backends)
(let ((mode major-mode)
(modes (list major-mode)))
(while (setq mode (get mode 'derived-mode-parent))
(push mode modes))
(dolist (mode modes)
(dolist (backend (append (cdr (assq mode +company-backend-alist))
(default-value 'company-backends)))
(push backend backends)))
(delete-dups
(append (cl-loop for (mode . backends) in +company-backend-alist
if (or (eq major-mode mode) ; major modes
(and (boundp mode)
(symbol-value mode))) ; minor modes
append backends)
(nreverse backends))))))
;;
@ -70,9 +67,11 @@ To have BACKENDS apply to any mode that is a parent of MODES, set MODES to
;;;###autoload
(defun +company|init-backends ()
"Set `company-backends' for the current buffer."
(unless (eq major-mode 'fundamental-mode)
(set (make-local-variable 'company-backends) (+company--backends)))
(add-hook 'after-change-major-mode-hook #'+company|init-backends nil 'local))
(if (not company-mode)
(remove-hook 'change-major-mode-after-body-hook #'+company|init-backends 'local)
(unless (eq major-mode 'fundamental-mode)
(setq-local company-backends (+company--backends)))
(add-hook 'change-major-mode-after-body-hook #'+company|init-backends nil 'local)))
(put '+company|init-backends 'permanent-local-hook t)