;;; company-capf.el --- company-mode completion-at-point-functions backend -*- lexical-binding: t -*- ;; Copyright (C) 2013-2016 Free Software Foundation, Inc. ;; Author: Stefan Monnier ;; This file is part of GNU Emacs. ;; GNU Emacs is free software: you can redistribute it and/or modify ;; it under the terms of the GNU General Public License as published by ;; the Free Software Foundation, either version 3 of the License, or ;; (at your option) any later version. ;; GNU Emacs is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; You should have received a copy of the GNU General Public License ;; along with GNU Emacs. If not, see . ;;; Commentary: ;; ;;; Code: (require 'company) (require 'cl-lib) (defvar company--capf-cache nil) (defun company--capf-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))) (completion-at-point-functions (company--capf-workaround)) (data (run-hook-wrapped 'completion-at-point-functions ;; Ignore misbehaving functions. #'completion--capf-wrapper 'optimist))) (when (and (consp (cdr data)) (integer-or-marker-p (nth 1 data))) data))) (declare-function python-shell-get-process "python") (defun company--capf-workaround () ;; For http://debbugs.gnu.org/cgi/bugreport.cgi?bug=18067 (if (or (not (listp completion-at-point-functions)) (not (memq 'python-completion-complete-at-point completion-at-point-functions)) (python-shell-get-process)) completion-at-point-functions (remq 'python-completion-complete-at-point completion-at-point-functions))) (defun company-capf (command &optional arg &rest _args) "`company-mode' backend using `completion-at-point-functions'." (interactive (list 'interactive)) (pcase command (`interactive (company-begin-backend 'company-capf)) (`prefix (let ((res (company--capf-data))) (when res (let ((length (plist-get (nthcdr 4 res) :company-prefix-length)) (prefix (buffer-substring-no-properties (nth 1 res) (point)))) (cond ((> (nth 2 res) (point)) 'stop) (length (cons prefix length)) (t prefix)))))) (`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)) (sortfun (cdr (assq 'display-sort-function meta))) (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)))))) (`match ;; Can't just use 0 when base-size (see above) is non-zero. (let ((start (if (get-text-property 0 'face arg) 0 (next-single-property-change 0 '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 'face arg))) (text-property-not-all start (length arg) '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)) (table (nth 3 res)) (pred (plist-get (nthcdr 4 res) :predicate))) (if exit-function ;; Follow the example of `completion--done'. (funcall exit-function arg (if (eq (try-completion arg table pred) t) 'finished 'sole))))) )) (provide 'company-capf) ;;; company-capf.el ends here