;;; company-capf.el --- company-mode completion-at-point-functions back-end -*- lexical-binding: t -*-
-;; Copyright (C) 2013 Free Software Foundation, Inc.
+;; Copyright (C) 2013-2014 Free Software Foundation, Inc.
;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
;;; Code:
+(require 'company)
+(require 'cl-lib)
+
+(defvar company--capf-cache nil)
+
(defun company--capf-data ()
- (let ((data (run-hook-wrapped 'completion-at-point-functions
- ;; Ignore misbehaving functions.
- #'completion--capf-wrapper 'optimist)))
- (when (consp data) data)))
+ (let ((cache company--capf-cache))
+ (if (and (equal (current-buffer) (car cache))
+ (equal (point) (car (setq cache (cdr cache))))
+ (equal (buffer-chars-modified-tick) (car (setq cache (cdr cache)))))
+ (cadr cache)
+ (let ((data (company--capf-data-real)))
+ (setq company--capf-cache
+ (list (current-buffer) (point) (buffer-chars-modified-tick) data))
+ data))))
+
+(defun company--capf-data-real ()
+ (cl-letf* (((default-value 'completion-at-point-functions)
+ ;; Ignore tags-completion-at-point-function because it subverts
+ ;; company-etags in the default value of company-backends, where
+ ;; the latter comes later.
+ (remove 'tags-completion-at-point-function
+ (default-value 'completion-at-point-functions)))
+ (data (run-hook-wrapped 'completion-at-point-functions
+ ;; Ignore misbehaving functions.
+ #'completion--capf-wrapper 'optimist)))
+ (when (and (consp (cdr data)) (numberp (nth 1 data))) data)))
(defun company-capf (command &optional arg &rest _args)
- "`company-mode' back-end using `completion-at-point-functions'.
-Requires Emacs 24.1 or newer."
+ "`company-mode' back-end using `completion-at-point-functions'."
(interactive (list 'interactive))
- (case command
- (interactive (company-begin-backend 'company-capf))
- (prefix
+ (pcase command
+ (`interactive (company-begin-backend 'company-capf))
+ (`prefix
(let ((res (company--capf-data)))
(when res
(if (> (nth 2 res) (point))
'stop
(buffer-substring-no-properties (nth 1 res) (point))))))
- (candidates
+ (`candidates
(let ((res (company--capf-data)))
(when res
(let* ((table (nth 3 res))
(pred (plist-get (nthcdr 4 res) :predicate))
(meta (completion-metadata
- (buffer-substring (nth 1 res) (nth 2 res))
- table pred))
+ (buffer-substring (nth 1 res) (nth 2 res))
+ table pred))
(sortfun (cdr (assq 'display-sort-function meta)))
- (candidates (all-completions arg table pred)))
- (if sortfun (funcall sortfun candidates) candidates)))))
- (sorted
+ (candidates (completion-all-completions arg table pred (length arg)))
+ (last (last candidates))
+ (base-size (and (numberp (cdr last)) (cdr last))))
+ (when base-size
+ (setcdr last nil))
+ (when sortfun
+ (setq candidates (funcall sortfun candidates)))
+ (if (not (zerop (or base-size 0)))
+ (let ((before (substring arg 0 base-size)))
+ (mapcar (lambda (candidate)
+ (concat before candidate))
+ candidates))
+ candidates)))))
+ (`sorted
(let ((res (company--capf-data)))
(when res
(let ((meta (completion-metadata
(buffer-substring (nth 1 res) (nth 2 res))
(nth 3 res) (plist-get (nthcdr 4 res) :predicate))))
(cdr (assq 'display-sort-function meta))))))
- (duplicates nil) ;Don't bother.
- (no-cache t) ;FIXME: Improve!
- (meta nil) ;FIXME: Return one-line docstring for `arg'.
- (doc-buffer nil) ;FIXME: Return help buffer for `arg'.
- (location nil) ;FIXME: Return (BUF . POS) or (FILE . LINENB) of `arg'.
- (require-match nil) ;Front-ends should also have a say in this.
- (init nil) ;Don't bother: plenty of other ways to initialize the code.
- (post-completion
+ (`match
+ ;; Can't just use 0 when base-size (see above) is non-zero.
+ (let ((start (if (get-text-property 0 'font-lock-face arg)
+ 0
+ (next-single-property-change 0 'font-lock-face arg))))
+ (when start
+ ;; completions-common-part comes first, but we can't just look for this
+ ;; value because it can be in a list.
+ (or
+ (let ((value (get-text-property start 'font-lock-face arg)))
+ (text-property-not-all start (length arg)
+ 'font-lock-face value arg))
+ (length arg)))))
+ (`duplicates t)
+ (`no-cache t) ;Not much can be done here, as long as we handle
+ ;non-prefix matches.
+ (`meta
+ (let ((f (plist-get (nthcdr 4 (company--capf-data)) :company-docsig)))
+ (when f (funcall f arg))))
+ (`doc-buffer
+ (let ((f (plist-get (nthcdr 4 (company--capf-data)) :company-doc-buffer)))
+ (when f (funcall f arg))))
+ (`location
+ (let ((f (plist-get (nthcdr 4 (company--capf-data)) :company-location)))
+ (when f (funcall f arg))))
+ (`annotation
+ (save-excursion
+ ;; FIXME: `company-begin' sets `company-point' after calling
+ ;; `company--begin-new'. We shouldn't rely on `company-point' here,
+ ;; better to cache the capf-data value instead. However: we can't just
+ ;; save the last capf-data value in `prefix', because that command can
+ ;; get called more often than `candidates', and at any point in the
+ ;; buffer (https://github.com/company-mode/company-mode/issues/153).
+ ;; We could try propertizing the returned prefix string, but it's not
+ ;; passed to `annotation', and `company-prefix' is set only after
+ ;; `company--strip-duplicates' is called.
+ (when company-point
+ (goto-char company-point))
+ (let ((f (plist-get (nthcdr 4 (company--capf-data)) :annotation-function)))
+ (when f (funcall f arg)))))
+ (`require-match
+ (plist-get (nthcdr 4 (company--capf-data)) :company-require-match))
+ (`init nil) ;Don't bother: plenty of other ways to initialize the code.
+ (`post-completion
(let* ((res (company--capf-data))
(exit-function (plist-get (nthcdr 4 res) :exit-function)))
(if exit-function