elisp-completion-at-point: Prioritize being quoted over funpos

* lisp/progmodes/elisp-mode.el (elisp-completion-at-point):
Only consider function position when not inside quoted form
(bug#20425).

* test/automated/elisp-mode-tests.el: New file.

2 files changed, 92 insertions, 3 deletions

diff --git a/lisp/progmodes/elisp-mode.el b/lisp/progmodes/elisp-mode.el
index 2bb661a59c8..7c9a2d7c422 100644
--- a/lisp/progmodes/elisp-mode.el
+++ b/lisp/progmodes/elisp-mode.el
@@ -475,11 +475,12 @@ It can be quoted, or be inside a quoted form."
                       (point)))
                 (scan-error pos))))
            ;; t if in function position.
-           (funpos (eq (char-before beg) ?\()))
+           (funpos (eq (char-before beg) ?\())
+           (quoted (elisp--form-quoted-p beg)))
       (when (and end (or (not (nth 8 (syntax-ppss)))
                          (eq (char-before beg) ?`)))
         (let ((table-etc
-               (if (not funpos)
+               (if (or (not funpos) quoted)
                    ;; FIXME: We could look at the first element of the list and
                    ;; use it to provide a more specific completion table in some
                    ;; cases.  E.g. filter out keywords that are not understood by
@@ -491,7 +492,7 @@ It can be quoted, or be inside a quoted form."
                            :company-doc-buffer #'elisp--company-doc-buffer
                            :company-docsig #'elisp--company-doc-string
                            :company-location #'elisp--company-location))
-                    ((elisp--form-quoted-p beg)
+                    (quoted
                      (list nil obarray
                            ;; Don't include all symbols (bug#16646).
                            :predicate (lambda (sym)
diff --git a/test/automated/elisp-mode-tests.el b/test/automated/elisp-mode-tests.el
new file mode 100644
index 00000000000..a4148e9e5ff
--- /dev/null
+++ b/test/automated/elisp-mode-tests.el
@@ -0,0 +1,88 @@
+;;; elisp-mode-tests.el --- Tests for emacs-lisp-mode  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2015 Free Software Foundation, Inc.
+
+;; Author: Dmitry Gutov <dgutov@yandex.ru>
+
+;; 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/>.
+
+;;; Code:
+
+(require 'ert)
+
+(defun elisp--test-completions ()
+  (let ((data (elisp-completion-at-point)))
+    (all-completions (buffer-substring (nth 0 data) (nth 1 data))
+                     (nth 2 data)
+                     (plist-get (nthcdr 3 data) :predicate))))
+
+(ert-deftest elisp-completes-functions ()
+  (with-temp-buffer
+    (emacs-lisp-mode)
+    (insert "(ba")
+    (let ((comps (elisp--test-completions)))
+      (should (member "backup-buffer" comps))
+      (should-not (member "backup-inhibited" comps)))))
+
+(ert-deftest elisp-completes-variables ()
+  (with-temp-buffer
+    (emacs-lisp-mode)
+    (insert "(foo ba")
+    (let ((comps (elisp--test-completions)))
+      (should (member "backup-inhibited" comps))
+      (should-not (member "backup-buffer" comps)))))
+
+(ert-deftest elisp-completes-anything-quoted ()
+  (dolist (text '("`(foo ba" "(foo 'ba"
+                  "`(,foo ba" "`,(foo `ba"
+                  "'(foo (ba"))
+    (with-temp-buffer
+      (emacs-lisp-mode)
+      (insert text)
+      (let ((comps (elisp--test-completions)))
+        (should (member "backup-inhibited" comps))
+        (should (member "backup-buffer" comps))
+        (should (member "backup" comps))))))
+
+(ert-deftest elisp-completes-variables-unquoted ()
+  (dolist (text '("`(foo ,ba" "`(,(foo ba" "`(,ba"))
+    (with-temp-buffer
+      (emacs-lisp-mode)
+      (insert text)
+      (let ((comps (elisp--test-completions)))
+        (should (member "backup-inhibited" comps))
+        (should-not (member "backup-buffer" comps))))))
+
+(ert-deftest elisp-completes-functions-in-special-macros ()
+  (dolist (text '("(declare-function ba" "(cl-callf2 ba"))
+    (with-temp-buffer
+      (emacs-lisp-mode)
+      (insert text)
+      (let ((comps (elisp--test-completions)))
+        (should (member "backup-buffer" comps))
+        (should-not (member "backup-inhibited" comps))))))
+
+(ert-deftest elisp-completes-local-variables ()
+  (with-temp-buffer
+    (emacs-lisp-mode)
+    (insert "(let ((bar 1) baz) (foo ba")
+    (let ((comps (elisp--test-completions)))
+      (should (member "backup-inhibited" comps))
+      (should (member "bar" comps))
+      (should (member "baz" comps)))))
+
+(provide 'elisp-mode-tests)
+;;; elisp-mode-tests.el ends here