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+;;; company-elisp.el --- company-mode completion backend for Emacs Lisp -*- lexical-binding: t -*-
+
+;; Copyright (C) 2009, 2011-2013, 2017  Free Software Foundation, Inc.
+
+;; Author: Nikolaj Schumacher
+
+;; 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:
+;;
+;; In newer versions of Emacs, company-capf is used instead.
+
+;;; Code:
+
+(require 'company)
+(require 'cl-lib)
+(require 'help-mode)
+(require 'find-func)
+
+(defgroup company-elisp nil
+  "Completion backend for Emacs Lisp."
+  :group 'company)
+
+(defcustom company-elisp-detect-function-context t
+  "If enabled, offer Lisp functions only in appropriate contexts.
+Functions are offered for completion only after ' and \(."
+  :type '(choice (const :tag "Off" nil)
+                 (const :tag "On" t)))
+
+(defcustom company-elisp-show-locals-first t
+  "If enabled, locally bound variables and functions are displayed
+first in the candidates list."
+  :type '(choice (const :tag "Off" nil)
+                 (const :tag "On" t)))
+
+(defun company-elisp--prefix ()
+  (let ((prefix (company-grab-symbol)))
+    (if prefix
+        (when (if (company-in-string-or-comment)
+                  (= (char-before (- (point) (length prefix))) ?`)
+                (company-elisp--should-complete))
+          prefix)
+      'stop)))
+
+(defun company-elisp--predicate (symbol)
+  (or (boundp symbol)
+      (fboundp symbol)
+      (facep symbol)
+      (featurep symbol)))
+
+(defun company-elisp--fns-regexp (&rest names)
+  (concat "\\_<\\(?:cl-\\)?" (regexp-opt names) "\\*?\\_>"))
+
+(defvar company-elisp-parse-limit 30)
+(defvar company-elisp-parse-depth 100)
+
+(defvar company-elisp-defun-names '("defun" "defmacro" "defsubst"))
+
+(defvar company-elisp-var-binding-regexp
+  (apply #'company-elisp--fns-regexp "let" "lambda" "lexical-let"
+         company-elisp-defun-names)
+  "Regular expression matching head of a multiple variable bindings form.")
+
+(defvar company-elisp-var-binding-regexp-1
+  (company-elisp--fns-regexp "dolist" "dotimes")
+  "Regular expression matching head of a form with one variable binding.")
+
+(defvar company-elisp-fun-binding-regexp
+  (company-elisp--fns-regexp "flet" "labels")
+  "Regular expression matching head of a function bindings form.")
+
+(defvar company-elisp-defuns-regexp
+  (concat "([ \t\n]*"
+          (apply #'company-elisp--fns-regexp company-elisp-defun-names)))
+
+(defun company-elisp--should-complete ()
+  (let ((start (point))
+        (depth (car (syntax-ppss))))
+    (not
+     (when (> depth 0)
+       (save-excursion
+         (up-list (- depth))
+         (when (looking-at company-elisp-defuns-regexp)
+           (forward-char)
+           (forward-sexp 1)
+           (unless (= (point) start)
+             (condition-case nil
+                 (let ((args-end (scan-sexps (point) 2)))
+                   (or (null args-end)
+                       (> args-end start)))
+               (scan-error
+                t)))))))))
+
+(defun company-elisp--locals (prefix functions-p)
+  (let ((regexp (concat "[ \t\n]*\\(\\_<" (regexp-quote prefix)
+                        "\\(?:\\sw\\|\\s_\\)*\\_>\\)"))
+        (pos (point))
+        res)
+    (condition-case nil
+        (save-excursion
+          (dotimes (_ company-elisp-parse-depth)
+            (up-list -1)
+            (save-excursion
+              (when (eq (char-after) ?\()
+                (forward-char 1)
+                (when (ignore-errors
+                        (save-excursion (forward-list)
+                                        (<= (point) pos)))
+                  (skip-chars-forward " \t\n")
+                  (cond
+                   ((looking-at (if functions-p
+                                    company-elisp-fun-binding-regexp
+                                  company-elisp-var-binding-regexp))
+                    (down-list 1)
+                    (condition-case nil
+                        (dotimes (_ company-elisp-parse-limit)
+                          (save-excursion
+                            (when (looking-at "[ \t\n]*(")
+                              (down-list 1))
+                            (when (looking-at regexp)
+                              (cl-pushnew (match-string-no-properties 1) res)))
+                          (forward-sexp))
+                      (scan-error nil)))
+                   ((unless functions-p
+                      (looking-at company-elisp-var-binding-regexp-1))
+                    (down-list 1)
+                    (when (looking-at regexp)
+                      (cl-pushnew (match-string-no-properties 1) res)))))))))
+      (scan-error nil))
+    res))
+
+(defun company-elisp-candidates (prefix)
+  (let* ((predicate (company-elisp--candidates-predicate prefix))
+         (locals (company-elisp--locals prefix (eq predicate 'fboundp)))
+         (globals (company-elisp--globals prefix predicate))
+         (locals (cl-loop for local in locals
+                          when (not (member local globals))
+                          collect local)))
+    (if company-elisp-show-locals-first
+        (append (sort locals 'string<)
+                (sort globals 'string<))
+      (append locals globals))))
+
+(defun company-elisp--globals (prefix predicate)
+  (all-completions prefix obarray predicate))
+
+(defun company-elisp--candidates-predicate (prefix)
+  (let* ((completion-ignore-case nil)
+         (beg (- (point) (length prefix)))
+         (before (char-before beg)))
+    (if (and company-elisp-detect-function-context
+             (not (memq before '(?' ?`))))
+        (if (and (eq before ?\()
+                 (not
+                  (save-excursion
+                    (ignore-errors
+                      (goto-char (1- beg))
+                      (or (company-elisp--before-binding-varlist-p)
+                          (progn
+                            (up-list -1)
+                            (company-elisp--before-binding-varlist-p)))))))
+            'fboundp
+          'boundp)
+      'company-elisp--predicate)))
+
+(defun company-elisp--before-binding-varlist-p ()
+  (save-excursion
+    (and (prog1 (search-backward "(")
+           (forward-char 1))
+         (looking-at company-elisp-var-binding-regexp))))
+
+(defun company-elisp--doc (symbol)
+  (let* ((symbol (intern symbol))
+         (doc (if (fboundp symbol)
+                  (documentation symbol t)
+                (documentation-property symbol 'variable-documentation t))))
+    (and (stringp doc)
+         (string-match ".*$" doc)
+         (match-string 0 doc))))
+
+;;;###autoload
+(defun company-elisp (command &optional arg &rest ignored)
+  "`company-mode' completion backend for Emacs Lisp."
+  (interactive (list 'interactive))
+  (cl-case command
+    (interactive (company-begin-backend 'company-elisp))
+    (prefix (and (derived-mode-p 'emacs-lisp-mode 'inferior-emacs-lisp-mode)
+                 (company-elisp--prefix)))
+    (candidates (company-elisp-candidates arg))
+    (sorted company-elisp-show-locals-first)
+    (meta (company-elisp--doc arg))
+    (doc-buffer (let ((symbol (intern arg)))
+                  (save-window-excursion
+                    (ignore-errors
+                      (cond
+                       ((fboundp symbol) (describe-function symbol))
+                       ((boundp symbol) (describe-variable symbol))
+                       ((featurep symbol) (describe-package symbol))
+                       ((facep symbol) (describe-face symbol))
+                       (t (signal 'user-error nil)))
+                      (help-buffer)))))
+    (location (let ((sym (intern arg)))
+                (cond
+                 ((fboundp sym) (find-definition-noselect sym nil))
+                 ((boundp sym) (find-definition-noselect sym 'defvar))
+                 ((featurep sym) (cons (find-file-noselect (find-library-name
+                                                            (symbol-name sym)))
+                                       0))
+                 ((facep sym) (find-definition-noselect sym 'defface)))))))
+
+(provide 'company-elisp)
+;;; company-elisp.el ends here