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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
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