* lisp/emacs-lisp/package-vc.el (package-vc--version): Replace
docstring.
It seems like this was just copied over from 'package-vc-commit', for
no good reason.
* lisp/emacs-lisp/package-vc.el (package-vc-selected-packages): Remove
reference to non-existent function and add an explanation that the
value won't override an existing source package installation.
* lisp/emacs-lisp/package-vc.el (package-vc--sourced-packages-list):
Remove function in favour of 'package-vc--read-package-name'.
(package-vc--read-package-name):
Extract out common functionality.
(package-vc--read-package-desc): Add auxiliary function based on
'package-vc--read-package-name'.
(package-vc-update): Add interactive spec using
'package-vc--read-package-desc'.
(package-vc-install): Use 'package-vc--read-package-desc'.
(package-vc-checkout): Use 'package-vc--read-package-desc'.
(package-vc--read-pkg): Remove in favour of 'package-vc--read-package-desc'.
(package-vc-refresh): Use 'package-vc--read-package-desc'.
(package-vc-prepare-patch): Use 'package-vc--read-package-desc'.
* lisp/emacs-lisp/package-vc.el (package-vc-ensure-packages): Add an
autoload cookie.
(package-vc-selected-packages): Set
:initialize to 'custom-initialize-default'.
* lisp/emacs-lisp/package-vc.el (package-vc-ensure-packages): Inter
sting keys while processing 'package-vc-selected-packages'.
As requested by Rudolf Adamkovič.
* doc/emacs/package.texi: Expand documentation and give example.
* etc/NEWS: Mention 'package-vc-selected-packages'.
* lisp/emacs-lisp/package-vc.el (package-vc--select-packages): Remove
function.
(package-vc-ensure-packages): Add function based on
'package-vc--select-packages'.
(package-vc-selected-packages): Call 'package-vc-ensure-packages' from
custom setter.
* lisp/emacs-lisp/package-vc.el (package-vc-release-rev): Use new
signature.
* lisp/vc/vc-git.el (vc-git-last-change): Update signature
* lisp/vc/vc.el (vc-default-last-change): Update signature and use
'annotate-command'.
* lisp/emacs-lisp/package-vc.el (package-vc-archive-spec-alist):
Unmention :release-rev
(package-vc-desc->spec): Fall back on other archives if a
specification is missing.
(package-vc-main-file): Add new function, copying the behaviour of
elpa-admin.el.
(package-vc-generate-description-file): Use 'package-vc-main-file'.
(package-vc-unpack): Handle special value ':last-release'.
(package-vc-release-rev): Add new function using 'last-change'.
(package-vc-install): Pass ':last-release' as REV instead of a
release.
* lisp/vc/vc-git.el (vc-git-last-change): Add Git 'last-change'
implementation.
* lisp/vc/vc.el (vc-default-last-change): Add default 'last-change'
implementation.
This attempts to replicate the behaviour of elpa-admin.el's
"elpaa--get-last-release-commit".
* lisp/emacs-lisp/package-vc.el (package-vc-archive-spec-alist):
Document the feature.
(package-vc-unpack): Check for :vc-backend in both PKG-SPEC and the
archive specification data.
* lisp/emacs-lisp/package-vc.el (package-vc--archives-initialize): Add
new function, extending 'package--archives-initialize'.
(package-vc-install): Use new function.
(package-vc-link-directory): Use new function.
* lisp/emacs-lisp/package-vc.el (package-vc-archive-spec-alist):
Update docstring.
(package-vc-install): Use :release-rev if invoked with a prefix argument.
* lisp/emacs-lisp/package-vc.el (package-vc-guess-backend): New
function.
(package-vc-unpack): Use it.
(package-vc-sourced-packages-list): Use it.
(package-vc-install): Use it.
