master 87f7412418: * lisp/emacs-lisp/package.el (package-get-version): Add fallback

[Stefan Monnier]

branch: master
commit 87f7412418ff2e4b2fe29d921aa6583b0b17bc29
Author: Stefan Monnier <monnier@iro.umontreal.ca>
Commit: Stefan Monnier <monnier@iro.umontreal.ca>

    * lisp/emacs-lisp/package.el (package-get-version): Add fallback
---
 lisp/emacs-lisp/package.el | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lisp/emacs-lisp/package.el b/lisp/emacs-lisp/package.el
index de4cebccca..7b90e361bd 100644
--- a/lisp/emacs-lisp/package.el
+++ b/lisp/emacs-lisp/package.el
@@ -4076,7 +4076,9 @@ The list is displayed in a buffer named `*Packages*'."
   "Return the version number of the package in which this is used.
 Assumes it is used from an Elisp file placed inside the top-level directory
 of an installed ELPA package.
-The return value is a string (or nil in case we can't find it)."
+The return value is a string (or nil in case we can't find it).
+It works in more cases if the call is in the file which contains
+the `Version:' header."
   ;; In a sense, this is a lie, but it does just what we want: precompute
   ;; the version at compile time and hardcodes it into the .elc file!
   (declare (pure t))
@@ -4095,6 +4097,7 @@ The return value is a string (or nil in case we can't 
find it)."
       (let* ((pkgdir (file-name-directory file))
              (pkgname (file-name-nondirectory (directory-file-name pkgdir)))
              (mainfile (expand-file-name (concat pkgname ".el") pkgdir)))
+        (unless (file-readable-p mainfile) (setq mainfile file))
         (when (file-readable-p mainfile)
           (require 'lisp-mnt)
           (with-temp-buffer