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bug#24627: 24.5; (thing-at-point 'list) may return a non-empty string wi

From: Andreas Röhler
Subject: bug#24627: 24.5; (thing-at-point 'list) may return a non-empty string without a list
Date: Tue, 11 Oct 2016 20:40:12 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:45.0) Gecko/20100101 Icedove/45.4.0

On 11.10.2016 18:29, Tino Calancha wrote:
Andreas Röhler <address@hidden> writes:


(defun foo ())

at first open paren

M-: (thing-at-point 'list t) RET

returns the whole thing, right.

But at second open paren returns the whole function too - where it
should return the empty arg-list
Following patch do the right thing in my example and your example.
Feel free to check it with some other examples that you may have:

 From dc2703a43a7b5dae60f7e88805971472253d4600 Mon Sep 17 00:00:00 2001
From: Tino Calancha <address@hidden>
Date: Wed, 12 Oct 2016 01:16:52 +0900
Subject: [PATCH] (thing-at-point 'list) return nil if no list at point

* lisp/thingatpt.el (thing-at-point-bounds-of-list-at-point):
Check first if we are at the beginning of a top-level sexp (Bug#24627).
Escape '[' and ']' in doc string.
  lisp/thingatpt.el | 22 +++++++++-------------
  1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/lisp/thingatpt.el b/lisp/thingatpt.el
index 6d1014b..acacff2 100644
--- a/lisp/thingatpt.el
+++ b/lisp/thingatpt.el
@@ -219,22 +219,18 @@ 'beginning-of-sexp
(defun thing-at-point-bounds-of-list-at-point ()
    "Return the bounds of the list at point.
-[Internal function used by `bounds-of-thing-at-point'.]"
+\[Internal function used by `bounds-of-thing-at-point'.\]"
      (let ((opoint (point))
-         (beg (ignore-errors
-                (up-list -1)
-                (point))))
+          (beg (if (looking-at-p "(")
+                   (point)
+                 (ignore-errors
+                   (up-list -1)
+                   (point)))))
-       (if beg
-           (progn (forward-sexp)
-                  (cons beg (point)))
-         ;; Are we are at the beginning of a top-level sexp?
-         (forward-sexp)
-         (let ((end (point)))
-           (backward-sexp)
-           (if (>= opoint (point))
-               (cons opoint end))))))))
+        (when beg
+          (forward-sexp)
+          (cons beg (point)))))))
;; Defuns

Hmm, what if cursor is inside a string or comment?

BTW "list" might be more universal if understood syntactically
What about writing

(eq 4 (car (syntax-after (point))))

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