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+;;; company-capf.el --- company-mode completion-at-point-functions backend -*- lexical-binding: t -*-
+
+;; Copyright (C) 2013-2018  Free Software Foundation, Inc.
+
+;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
+
+;; 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 <http://www.gnu.org/licenses/>.
+
+
+;;; Commentary:
+;;
+;; The CAPF back-end provides a bridge to the standard
+;; completion-at-point-functions facility, and thus can support any major mode
+;; that defines a proper completion function, including emacs-lisp-mode,
+;; css-mode and nxml-mode.
+
+;;; 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
+     ;; Ask the for the `:company-match' function.  If that doesn't help,
+     ;; fallback to sniffing for face changes to get a suitable value.
+     (let ((f (plist-get (nthcdr 4 (company--capf-data)) :company-match)))
+       (if f (funcall f arg)
+         (let* ((match-start nil) (pos -1)
+                (prop-value nil)  (faces nil)
+                (has-face-p nil)  chunks
+                (limit (length arg)))
+           (while (< pos limit)
+             (setq pos
+                   (if (< pos 0) 0 (next-property-change pos arg limit)))
+             (setq prop-value (or
+                               (get-text-property pos 'face arg)
+                               (get-text-property pos 'font-lock-face arg))
+                   faces (if (listp prop-value) prop-value (list prop-value))
+                   has-face-p (memq 'completions-common-part faces))
+             (cond ((and (not match-start) has-face-p)
+                    (setq match-start pos))
+                   ((and match-start (not has-face-p))
+                    (push (cons match-start pos) chunks)
+                    (setq match-start nil))))
+           (nreverse chunks)))))
+    (`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
+     (company--capf-post-completion arg))
+    ))
+
+(defun company--capf-post-completion (arg)
+  (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
+                 ;; FIXME: Should probably use an additional heuristic:
+                 ;; completion-at-point doesn't know when the user picked a
+                 ;; particular candidate explicitly (it only checks whether
+                 ;; futher completions exist). Whereas company user can press
+                 ;; RET (or use implicit completion with company-tng).
+                 (if (eq (try-completion arg table pred) t)
+                     'finished 'sole)))))
+
+(provide 'company-capf)
+
+;;; company-capf.el ends here