bug#37546: 26.3; Implement multi-file package README long description generation as described by elisp manual

[oitofelix@gnu.org (Bruno Félix Rezende Ribeiro)]

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Hello Emacs developers,

The inlined patch implements the (already expected) generation of
multi-file package long description from a potential README file
residing inside the package’s content directory.  Currently Emacs only
implements the long description generation from commentary sections and
for single-file packages.

This behavior is documented in ‘(elisp) Multi-file Packages’ and the
function ‘package-upload-buffer-internal’ from ‘package-x.el’ had a
‘FIXME: Get it from the README file.’ right on the spot of this
implementation.


Let me know if any change is necessary.  Thanks!



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diff --git a/lisp/emacs-lisp/package-x.el b/lisp/emacs-lisp/package-x.el
index 2815be3..d929cf5 100644
--- a/lisp/emacs-lisp/package-x.el
+++ b/lisp/emacs-lisp/package-x.el
@@ -205,7 +205,10 @@ if it exists."
 	       (commentary
                 (pcase file-type
                   ('single (lm-commentary))
-                  ('tar nil))) ;; FIXME: Get it from the README file.
+                  ('tar (when (file-exists-p "README")
+                          (with-temp-buffer
+                            (insert-file-contents "README")
+                            (buffer-string))))))
                (extras (package-desc-extras pkg-desc))
 	       (pkg-version (package-version-join split-version))
 	       (pkg-buffer (current-buffer)))

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