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package.el version 0.7

From: Tom Tromey
Subject: package.el version 0.7
Date: Fri, 18 Apr 2008 08:42:35 -0600
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux)

Appended is package.el version 0.7.

This version has a few new features:

* It fixes a bug in package activation.  Formerly, if you had a newer
  version of a package that came with Emacs, the new version would not
  activate.  For instance, I have ERC 5.3 installed and I am using
  Emacs 22; package.el 0.6 always chose the built-in ERC.

* There is now a global menu item to open the package menu.

* package-list-packages fetches the new package list by default.  You
  can use the new package-list-packages-no-fetch function to get the
  old behavior.

* The package menu "?" command will display some information about a
  package.  You don't have to have the package installed to do this --
  it downloads the information from the ELPA web site.  (This feature
  is dependent on the particular package including the necessary
  metadata; not all packages do this.)

* The list of packages that are built in to Emacs is now downloaded
  from the web site (there is also a copy in package.el for
  compatibility).  This makes it much simpler to upload a package
  which will be (or already is) shipped with Emacs; it also means that
  users don't have to upgrade package.el in this scenario.

package.el is a simple package manager for Emacs.  It is connected to
ELPA, the Emacs Lisp Package Archive.  Read more here:

If you are not using package.el yet, follow the install instructions
on the web site.  There is an auto-installer; you can be up and
running in seconds.  Or, read the appended .el to see what to do.

If you are using package.el before 0.4, you have to copy this version
over the old version.

If you are using package.el 0.4 or later, you can update from the
package menu.

As always, I welcome questions, comments, and suggestions.  If you
maintain an Emacs Lisp package, see the web page for information on
getting it into ELPA.  Suggestions for packages to upload are also


;;; package.el --- Simple package system for Emacs

;; Copyright (C) 2007, 2008 Tom Tromey <address@hidden>

;; Author: Tom Tromey <address@hidden>
;; Created: 10 Mar 2007
;; Version: 0.7
;; Keywords: tools

;; This file is not (yet) part of GNU Emacs.
;; However, it is distributed under the same license.

;; 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 2, 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
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Change Log:

;;  2 Apr 2007 - now using ChangeLog file
;; 15 Mar 2007 - updated documentation
;; 14 Mar 2007 - Changed how obsolete packages are handled
;; 13 Mar 2007 - Wrote package-install-from-buffer
;; 12 Mar 2007 - Wrote package-menu mode

;;; Commentary:

;; To use this, put package.el somewhere on your load-path.  Then add
;; this to your .emacs:
;;    (load "package")
;;    (package-initialize)
;; This will automatically make available the packages you have
;; installed using package.el.  If your .emacs will refer to these
;; packages, you may want to initialize the package manager near the
;; top.
;; Note that if you want to be able to automatically download and
;; install packages from ELPA (the Emacs Lisp Package Archive), then
;; you will need the 'url' package.  This comes with Emacs 22; Emacs
;; 21 users will have to find it elsewhere.
;; If you installed package.el via the auto-installer:
;; then you do not need to edit your .emacs, as the installer will
;; have done this for you.  The installer will also install the url
;; package if you need it.

;; Other external functions you may want to use:
;; M-x package-list-packages
;;    Enters a mode similar to buffer-menu which lets you manage
;;    packages.  You can choose packages for install (mark with "i",
;;    then "x" to execute) or deletion (not implemented yet), and you
;;    can see what packages are available.  This will automatically
;;    fetch the latest list of packages from ELPA.
;; M-x package-list-packages-no-fetch
;;    Like package-list-packages, but does not automatically fetch the
;;    new list of packages.
;; M-x package-install-from-buffer
;;    Install a package consisting of a single .el file that appears
;;    in the current buffer.  This only works for packages which
;;    define a Version header properly; package.el also supports the
;;    extension headers Package-Version (in case Version is an RCS id
;;    or similar), and Package-Requires (if the package requires other
;;    packages).
;; M-x package-install-file
;;    Install a package from the indicated file.  The package can be
;;    either a tar file or a .el file.  A tar file must contain an
;;    appropriately-named "-pkg.el" file; a .el file must be properly
;;    formatted as with package-install-from-buffer.

;; The idea behind package.el is to be able to download packages and
;; install them.  Packages are versioned and have versioned
;; dependencies.  Furthermore, this supports built-in packages which
;; may or may not be newer than user-specified packages.  This makes
;; it possible to upgrade Emacs and automatically disable packages
;; which have moved from external to core.  (Note though that we don't
;; currently register any of these, so this feature does not actually
;; work.)

;; This code supports a single package repository, ELPA.  All packages
;; must be registered there.

;; A package is described by its name and version.  The distribution
;; format is either  a tar file or a single .el file.

;; A tar file should be named "NAME-VERSION.tar".  The tar file must
;; unpack into a directory named after the package and version:
;; "NAME-VERSION".  It must contain a file named "PACKAGE-pkg.el"
;; which consists of a call to define-package.  It may also contain a
;; "dir" file and the info files it references.

;; A .el file will be named "NAME-VERSION.el" in ELPA, but will be
;; installed as simply "NAME.el" in a directory named "NAME-VERSION".

;; The downloader will download all dependent packages.  It will also
;; byte-compile the package's lisp at install time.

;; At activation time we will set up the load-path and the info path,
;; and we will load the package's autoloads.  If a package's
;; dependencies are not available, we will not activate that package.

;; Conceptually a package has multiple state transitions:
;; * Download.  Fetching the package from ELPA.
;; * Install.  Untar the package, or write the .el file, into
;;   ~/.emacs.d/elpa/ directory.
;; * Byte compile.  Currently this phase is done during install,
;;   but we may change this.
;; * Activate.  Evaluate the autoloads for the package to make it
;;   available to the user.
;; * Load.  Actually load the package and run some code from it.

;;; Thanks:
;;; (sorted by sort-lines):

;; Jim Blandy <address@hidden>
;; Karl Fogel <address@hidden>
;; Kevin Ryde <address@hidden>
;; Lawrence Mitchell
;; Michael Olson <address@hidden>
;; Sebastian Tennant <address@hidden>
;; Stefan Monnier <address@hidden>
;; Vinicius Jose Latorre <address@hidden>

;;; ToDo:

;; - putting info dirs at the start of the info path means
;;   users see a weird ordering of categories.  OTOH we want to
;;   override later entries.  maybe emacs needs to enforce
;;   the standard layout?
;; - put bytecode in a separate directory tree
;; - perhaps give users a way to recompile their bytecode
;;   or do it automatically when emacs changes
;; - give users a way to know whether a package is installed ok
;; - give users a way to view a package's documentation when it
;;   only appears in the .el
;; - use/extend checkdoc so people can tell if their package will work
;; - "installed" instead of a blank in the status column
;; - tramp needs its files to be compiled in a certain order.
;;   how to handle this?  fix tramp?
;; - on emacs 21 we don't kill the -autoloads.el buffer.  what about 22?
;; - maybe we need separate .elc directories for various emacs versions
;;   and also emacs-vs-xemacs.  That way conditional compilation can
;;   work.  But would this break anything?
;; - should store the package's keywords in archive-contents, then
;;   let the users filter the package-menu by keyword.  See
;;   finder-by-keyword.  (We could also let people view the
;;   Commentary, but it isn't clear how useful this is.)
;; - William Xu suggests being able to open a package file without
;;   installing it
;; - Interface with desktop.el so that restarting after an install
;;   works properly
;; - Implement M-x package-upgrade, to upgrade any/all existing packages
;; - Use hierarchical layout.  PKG/etc PKG/lisp PKG/info
;;   ... except maybe lisp?
;; - It may be nice to have a macro that expands to the package's
;;   private data dir, aka ".../etc".  Or, maybe data-directory
;;   needs to be a list (though this would be less nice)
;;   a few packages want this, eg sokoban
;; - package menu needs:
;;     ability to know which packages are built-in & thus not deletable
;;     it can sometimes print odd results, like 0.3 available but 0.4 active
;;        why is that?
;; - Allow multiple versions on the server...?
;;   [ why bother? ]
;; - Don't install a package which will invalidate dependencies overall
;; - Allow something like (or (>= emacs 21.0) (>= xemacs 21.5))
;;   [ currently thinking, why bother.. KISS ]
;; - Allow optional package dependencies
;;   then if we require 'bbdb', bbdb-specific lisp in lisp/bbdb
;;   and just don't compile to add to load path ...?
;; - Have a list of archive URLs?  [ maybe there's no point ]
;; - David Kastrup pointed out on the xemacs list that for GPL it
;;   is friendlier to ship the source tree.  We could "support" that
;;   by just having a "src" subdir in the package.  This isn't ideal
;;   but it probably is not worth trying to support random source
;;   tree layouts, build schemes, etc.
;; - Our treatment of the info path is somewhat bogus
;; - perhaps have an "unstable" tree in ELPA as well as a stable one

;;; Code:

(defconst package-archive-base "";
  "Base URL for the package archive.
Ordinarily you should not need to edit this.
The default points to ELPA, the Emacs Lisp Package Archive.
Note that some code in package.el assumes that this is an http: URL.")

(defconst package-archive-version 1
  "Version number of the package archive understood by this file.
Lower version numbers than this will probably be understood as well.")

;; Note that this only works if you have the password, which you
;; probably don't :-).  Also if you are using Emacs 21 then you will
;; need to hack ange-ftp-name-format to make this work.
(defvar package-archive-upload-base "/"
  "Base location for uploading to package archive.")

(defconst package-el-maintainer "Tom Tromey <address@hidden>"
  "The package.el maintainer.")

(defconst package-el-version "0.7"
  "Version of package.el.")

;; We don't prime the cache since it tends to get out of date.
(defvar package-archive-contents
  "A representation of the contents of the ELPA archive.
This is an alist mapping package names (symbols) to package
descriptor vectors.  These are like the vectors for `package-alist'
but have an extra entry which is 'tar for tar packages and
'single for single-file packages.")

(defvar package-user-dir
  (expand-file-name (convert-standard-filename "~/.emacs.d/elpa"))
  "Name of the directory where the user's packages are stored.")

(defvar package-directory-list
  (list (file-name-as-directory package-user-dir)
  "List of directories to search for packages.")

(defun package-version-split (string)
  "Split a package string into a version list."
  (mapcar 'string-to-int (split-string string "[.]")))

(defconst package--builtins-base
  ;; We use package-version split here to make sure to pick up the
  ;; minor version.
  `((emacs . [,(package-version-split emacs-version) nil
              "GNU Emacs"])
    (package . [,(package-version-split package-el-version)
                nil "Simple package system for GNU Emacs"]))
  "Packages which are always built-in.")

(defvar package--builtins
  (delq nil
         (if (>= emacs-major-version 22)
             ;; FIXME: emacs 22 includes tramp, rcirc, maybe
             ;; other things...
             '((erc . [(5 2) nil "An Emacs Internet Relay Chat client"])
               ;; The external URL is version 1.15, so make sure the
               ;; built-in one looks newer.
               (url . [(1 16) nil "URL handling libary"])))
         (if (>= emacs-major-version 23)
             '(;; Strangely, nxml-version is missing in Emacs 23.
               ;; We pick the merge date as the version.
               (nxml . [(20071123) nil "Major mode for editing XML documents."])
               (bubbles . [(0 5) nil "Puzzle game for Emacs."])))))
  "Alist of all built-in packages.
Maps the package name to a vector [VERSION REQS DOCSTRING].")

(defvar package-alist package--builtins
  "Alist of all packages available for activation.
Maps the package name to a vector [VERSION REQS DOCSTRING].")

(defvar package-activated-list
  (mapcar #'car package-alist)
  "List of the names of all activated packages.")

(defvar package-obsolete-alist nil
  "Representation of obsolete packages.
Like `package-alist', but maps package name to a second alist.
The inner alist is keyed by version.")

(defun package-version-join (l)
  "Turn a list of version numbers into a version string."
  (mapconcat 'int-to-string l "."))

(defun package--version-first-nonzero (l)
  (while (and l (= (car l) 0))
    (setq l (cdr l)))
  (if l (car l) 0))

(defun package-version-compare (v1 v2 fun)
  "Compare two version lists according to FUN.
FUN can be <, <=, =, >, >=, or /=."
  (while (and v1 v2 (= (car v1) (car v2)))
    (setq v1 (cdr v1)
          v2 (cdr v2)))
  (if v1
      (if v2
          ;; Both not null; we know the cars are not =.
          (funcall fun (car v1) (car v2))
        ;; V1 not null, V2 null.
        (funcall fun (package--version-first-nonzero v1) 0))
    (if v2
        ;; V1 null, V2 not null.
        (funcall fun 0 (package--version-first-nonzero v2))
      ;; Both null.
      (funcall fun 0 0))))

(defun package--test-version-compare ()
  "Test suite for `package-version-compare'."
  (unless (and (package-version-compare '(0) '(0) '=)
               (not (package-version-compare '(1) '(0) '=))
               (package-version-compare '(1 0 1) '(1) '>=)
               (package-version-compare '(1 0 1) '(1) '>)
               (not (package-version-compare '(0 9 1) '(1 0 2) '>=)))
    (error "Failed"))

(defun package-strip-version (dirname)
  "Strip the version from a combined package name and version.
E.g., if given \"quux-23.0\", will return \"quux\""
  (if (string-match "^\\(.*\\)-[0-9]+\\([.][0-9]+\\)*$" dirname)
      (match-string 1 dirname)))

(defun package-load-descriptor (dir package)
  "Load the description file for a package.
Return nil if the package could not be found."
  (let ((pkg-dir (concat (file-name-as-directory dir) package "/")))
    (if (file-directory-p pkg-dir)
        (load (concat pkg-dir (package-strip-version package) "-pkg") nil t))))

(defun package-load-all-descriptors ()
  "Load descriptors of all packages.
Uses `package-directory-list' to find packages."
  (mapc (lambda (dir)
          (if (file-directory-p dir)
              (mapc (lambda (name)
                      (package-load-descriptor dir name))
                    (directory-files dir nil "^[^.]"))))

(defsubst package-desc-vers (desc)
  "Extract version from a package description vector."
  (aref desc 0))

(defsubst package-desc-reqs (desc)
  "Extract requirements from a package description vector."
  (aref desc 1))

(defsubst package-desc-doc (desc)
  "Extract doc string from a package description vector."
  (aref desc 2))

(defsubst package-desc-kind (desc)
  "Extract the kind of download from an archive package description vector."
  (aref desc 3))

(defun package-do-activate (package pkg-vec)
  (let* ((pkg-name (symbol-name package))
         (pkg-ver-str (package-version-join (package-desc-vers pkg-vec)))
         (dir-list package-directory-list)
    (while dir-list
      (let ((subdir (concat (car dir-list) pkg-name "-" pkg-ver-str "/")))
        (if (file-directory-p subdir)
              (setq pkg-dir subdir)
              (setq dir-list nil))
          (setq dir-list (cdr dir-list)))))
    (unless pkg-dir
      (error "Internal error: could not find directory for %s-%s"
             pkg-name pkg-ver-str))
    (if (file-exists-p (concat pkg-dir "dir"))
          ;; FIXME: not the friendliest, but simple.
          (require 'info)
          (setq Info-directory-list (cons pkg-dir Info-directory-list))))
    (setq load-path (cons pkg-dir load-path))
    ;; Load the autoloads and activate the package.
    (load (concat pkg-dir (symbol-name package) "-autoloads")
          nil t)
    (setq package-activated-list (cons package package-activated-list))
    ;; Don't return nil.

(defun package--built-in (package version)
  "Return true if the package is built-in to Emacs."
  (let ((elt (assq package package--builtins)))
    (and elt
         (package-version-compare (package-desc-vers (cdr elt)) version '=))))

;; FIXME: return a reason instead?
(defun package-activate (package version)
  "Try to activate a package.
Return nil if the package could not be activated.
Recursively activates all dependencies of the named package."
  ;; Assume the user knows what he is doing -- go ahead and activate a
  ;; newer version of a package if an older one has already been
  ;; activated.  This is not ideal; we'd at least need to check to see
  ;; if the package has actually been loaded, and not merely
  ;; activated.  However, don't try to activate 'emacs', as that makes
  ;; no sense.
  (unless (eq package 'emacs)
    (let* ((pkg-desc (assq package package-alist))
           (this-version (package-desc-vers (cdr pkg-desc)))
           (req-list (package-desc-reqs (cdr pkg-desc)))
           (keep-going (package-version-compare this-version version '>)))
      (while (and req-list keep-going)
        (or (package-activate (car (car req-list))
                              (car (cdr (car req-list))))
            (setq keep-going nil))
        (setq req-list (cdr req-list)))
      (if keep-going
          (package-do-activate package (cdr pkg-desc))))))

(defun package-mark-obsolete (package pkg-vec)
  "Put package on the obsolete list, if not already there."
  (let ((elt (assq package package-obsolete-alist)))
    (if elt
        ;; If this obsolete version does not exist in the list, update
        ;; it the list.
        (unless (assoc (package-desc-vers pkg-vec) (cdr elt))
          (setcdr elt (cons (cons (package-desc-vers pkg-vec) pkg-vec)
                            (cdr elt))))
      ;; Make a new association.
      (setq package-obsolete-alist
            (cons (cons package (list (cons (package-desc-vers pkg-vec)

;; (define-package "emacs" "21.4.1" "GNU Emacs core package.")
;; (define-package "erc" "5.1" "ERC - irc client" '((emacs "21.0")))
(defun define-package (name-str version-string
                                &optional docstring requirements)
  "Define a new package.
NAME is the name of the package, a string.
VERSION-STRING is the version of the package, a dotted sequence
of integers.
DOCSTRING is the optional description.
REQUIREMENTS is a list of requirements on other packages.
Each requirement is of the form (OTHER-PACKAGE \"VERSION\")."
  (let* ((name (intern name-str))
         (pkg-desc (assq name package-alist))
         (new-version (package-version-split version-string))
          (cons name
                (vector new-version
                         (lambda (elt)
                           (list (car elt)
                                 (package-version-split (car (cdr elt)))))
    ;; Only redefine a package if the redefinition is newer.
    (if (or (not pkg-desc)
            (package-version-compare new-version
                                     (package-desc-vers (cdr pkg-desc))
          (when pkg-desc
            ;; Remove old package and declare it obsolete.
            (setq package-alist (delq pkg-desc package-alist))
            (package-mark-obsolete (car pkg-desc) (cdr pkg-desc)))
          ;; Add package to the alist.
          (setq package-alist (cons new-pkg-desc package-alist)))
      ;; You can have two packages with the same version, for instance
      ;; one in the system package directory and one in your private
      ;; directory.  We just let the first one win.
      (unless (package-version-compare new-version
                                       (package-desc-vers (cdr pkg-desc))
        ;; The package is born obsolete.
        (package-mark-obsolete (car new-pkg-desc) (cdr new-pkg-desc))))))

;; From Emacs 22.
(defun package-autoload-ensure-default-file (file)
  "Make sure that the autoload file FILE exists and if not create it."
  (unless (file-exists-p file)
     (concat ";;; " (file-name-nondirectory file)
             " --- automatically extracted autoloads\n"
             ";;; Code:\n\n"
             "\n;; Local Variables:\n"
             ";; version-control: never\n"
             ";; no-byte-compile: t\n"
             ";; no-update-autoloads: t\n"
             ";; End:\n"
             ";;; " (file-name-nondirectory file)
             " ends here\n")
     nil file))

(defun package-generate-autoloads (name pkg-dir)
  (let* ((auto-name (concat name "-autoloads.el"))
         (ignore-name (concat name "-pkg.el"))
         (generated-autoload-file (concat pkg-dir auto-name))
         (version-control 'never))
    ;; In Emacs 22 'update-autoloads-from-directories' does not seem
    ;; to be autoloaded...
    (require 'autoload)
    (unless (fboundp 'autoload-ensure-default-file)
      (package-autoload-ensure-default-file generated-autoload-file))
    (update-autoloads-from-directories pkg-dir)))

(defun package-untar-buffer ()
  "Untar the current buffer.
This uses `tar-untar-buffer' if it is available.
Otherwise it uses an external `tar' program.
`default-directory' should be set by the caller."
  (require 'tar-mode)
  (if (fboundp 'tar-untar-buffer)
        ;; tar-mode messes with narrowing, so we just let it have the
        ;; whole buffer to play with.
        (delete-region (point-min) (point))
    ;; FIXME: check the result.
    (call-process-region (point) (point-max) "tar" nil '(nil nil) nil
                         "xf" "-")))

(defun package-unpack (name version)
  (let ((pkg-dir (concat (file-name-as-directory package-user-dir)
                         (symbol-name name) "-" version "/")))
    ;; Be careful!!
    (make-directory package-user-dir t)
    (if (file-directory-p pkg-dir)
        (mapc (lambda (file) nil) ; 'delete-file -- FIXME: when we're
                                  ; more confident
              (directory-files pkg-dir t "^[^.]")))
    (let* ((default-directory (file-name-as-directory package-user-dir)))
      (package-generate-autoloads (symbol-name name) pkg-dir)
      (let ((load-path (cons pkg-dir load-path)))
        (byte-recompile-directory pkg-dir 0 t)))))

(defun package-unpack-single (file-name version desc requires)
  "Install the contents of the current buffer as a package."
  (let* ((dir (file-name-as-directory package-user-dir)))
    ;; Special case "package".
    (if (string= file-name "package")
        (write-region (point-min) (point-max) (concat dir file-name ".el")
                      nil nil nil nil)
      (let ((pkg-dir (file-name-as-directory
                      (concat dir file-name "-" version))))
        (make-directory pkg-dir t)
        (write-region (point-min) (point-max)
                      (concat pkg-dir file-name ".el")
                      nil nil nil 'excl)
        (let ((print-level nil)
              (print-length nil))
             (list 'define-package
                   (list 'quote
                         ;; Turn version lists into string form.
                          (lambda (elt)
                            (list (car elt)
                                  (package-version-join (car (cdr elt)))))
           (concat pkg-dir file-name "-pkg.el")
           nil nil nil 'excl))
        (package-generate-autoloads file-name pkg-dir)
        (let ((load-path (cons pkg-dir load-path)))
          (byte-recompile-directory pkg-dir 0 t))))))

(defun package-handle-response ()
  "Handle the response from the server.
Parse the HTTP response and throw if an error occurred.
The url package seems to require extra processing for this.
This should be called in a `save-excursion', in the download buffer.
It will move point to somewhere in the headers."
  ;; We assume HTTP here.
  (let ((response (url-http-parse-response)))
    (when (or (< response 200) (>= response 300))
      (display-buffer (current-buffer))
      (error "Error during download request:%s"
             (buffer-substring-no-properties (point) (progn

(defun package-download-single (name version desc requires)
  "Download and install a single-file package."
  (let ((buffer (url-retrieve-synchronously
                 (concat package-archive-base
                         (symbol-name name) "-" version ".el"))))
      (set-buffer buffer)
      (re-search-forward "^$" nil 'move)
      (delete-region (point-min) (point))
      (package-unpack-single (symbol-name name) version desc requires)
      (kill-buffer buffer))))

(defun package-download-tar (name version)
  "Download and install a tar package."
  (let ((tar-buffer (url-retrieve-synchronously
                     (concat package-archive-base
                             (symbol-name name) "-" version ".tar"))))
      (set-buffer tar-buffer)
      (re-search-forward "^$" nil 'move)
      (package-unpack name version)
      (kill-buffer tar-buffer))))

(defun package-installed-p (package version)
  (let ((pkg-desc (assq package package-alist)))
    (and pkg-desc
         (package-version-compare version
                                  (package-desc-vers (cdr pkg-desc))

(defun package-compute-transaction (result requirements)
  (while requirements
    (let* ((elt (car requirements))
           (next-pkg (car elt))
           (next-version (car (cdr elt))))
      (unless (package-installed-p next-pkg next-version)
        (let ((pkg-desc (assq next-pkg package-archive-contents)))
          (unless pkg-desc
            (error "Package '%s' not available for installation"
                   (symbol-name next-pkg)))
          (unless (package-version-compare (package-desc-vers (cdr pkg-desc))
             "Need package '%s' with version %s, but only %s is available"
             (symbol-name next-pkg) (package-version-join next-version)
             (package-version-join (package-desc-vers (cdr pkg-desc)))))
          ;; Only add to the transaction if we don't already have it.
          (unless (memq next-pkg result)
            (setq result (cons next-pkg result)))
          (setq result
                (package-compute-transaction result
                                              (cdr pkg-desc)))))))
    (setq requirements (cdr requirements)))

(defun package-read-from-string (str)
  "Read a Lisp expression from STR.
Signal an error if the entire string was not used."
  (let* ((read-data (read-from-string str))
             (condition-case nil
                       ;; The call to `ignore' suppresses a compiler warning.
                       (progn (ignore (read-from-string
                                       (substring str (cdr read-data))))
                   (end-of-file nil))))
    (if more-left
        (error "Can't read whole string")
      (car read-data))))

(defun package--read-archive-file (file)
  "Re-read archive file FILE, if it exists.
Will return the data from the file, or nil if the file does not exist.
Will throw an error if the archive version is too new."
  (let ((filename (concat (file-name-as-directory package-user-dir)
    (if (file-exists-p filename)
          (insert-file-contents-literally filename)
          (let ((contents (package-read-from-string
                           (buffer-substring-no-properties (point-min)
            (if (> (car contents) package-archive-version)
                (error "Package archive version %d is greater than %d - upgrade 
                       (car contents) package-archive-version))
            (cdr contents))))))

(defun package-read-archive-contents ()
  "Re-read `archive-contents' and `builtin-packages', if they exist.
Will set `package-archive-contents' and `package--builtins' if successful.
Will throw an error if the archive version is too new."
  (let ((archive-contents (package--read-archive-file "archive-contents"))
        (builtins (package--read-archive-file "builtin-packages")))
    (if archive-contents
        ;; Version 1 of 'archive-contents' is identical to our
        ;; internal representation.
        (setq package-archive-contents archive-contents))
    (if builtins
        ;; Version 1 of 'builtin-packages' is a list where the car is
        ;; a split emacs version and the cdr is an alist suitable for
        ;; package--builtins.
        (let ((our-version (package-version-split emacs-version))
              (result package--builtins-base))
          (setq package--builtins
                (dolist (elt builtins result)
                  (if (package-version-compare our-version (car elt) '>=)
                      (setq result (append (cdr elt) result)))))))))

(defun package-download-transaction (transaction)
  "Download and install all the packages in the given transaction."
  (mapc (lambda (elt)
          (let* ((desc (cdr (assq elt package-archive-contents)))
                 (v-string (package-version-join (package-desc-vers desc)))
                 (kind (package-desc-kind desc)))
             ((eq kind 'tar)
              (package-download-tar elt v-string))
             ((eq kind 'single)
              (package-download-single elt v-string
                                       (package-desc-doc desc)
                                       (package-desc-reqs desc)))
              (error "Unknown package kind: " (symbol-name kind))))))

(defun package-install (name)
  "Install the package named NAME.
Interactively, prompts for the package name.
The package is found on the archive site, see `package-archive-base'."
   (list (progn
           ;; Make sure we're using the most recent download of the
           ;; archive.  Maybe we should be updating the archive first?
           (intern (completing-read "Install package: "
                                    (mapcar (lambda (elt)
                                              (cons (symbol-name (car elt))
                                    nil t)))))
  (let ((pkg-desc (assq name package-archive-contents)))
    (unless pkg-desc
      (error "Package '%s' not available for installation"
             (symbol-name name)))
    (let ((transaction
           (package-compute-transaction (list name)
                                        (package-desc-reqs (cdr pkg-desc)))))
      (package-download-transaction transaction)))
  ;; Try to activate it.

(defun package-strip-rcs-id (v-str)
  "Strip RCS version ID from the version string.
If the result looks like a dotted numeric version, return it.
Otherwise return nil."
  (if v-str
      (if (string-match "^[ \t]*[$]Revision:[ \t]\([0-9.]+\)[ \t]*[$]$" v-str)
          (match-string 1 v-str)
        (if (string-match "^[0-9.]*$" v-str)

(defun package-buffer-info ()
  "Return a vector of information about the package in the current buffer.
FILENAME is the file name, a string.  It does not have the \".el\" extension.
REQUIRES is a requires list, or nil.
DESCRIPTION is the package description (a string).
VERSION is the version, a string.
COMMENTARY is the commentary section, a string, or nil if none.
Throws an exception if the buffer does not contain a conforming package.
If there is a package, narrows the buffer to the file's boundaries.
May narrow buffer or move point even on failure."
  (goto-char (point-min))
  (if (re-search-forward "^;;; \\([^ ]*\\)\\.el --- \\(.*\\)$" nil t)
      (let ((file-name (match-string 1))
            (desc (match-string 2))
            (start (progn (beginning-of-line) (point))))
        (if (search-forward (concat ";;; " file-name ".el ends here"))
              ;; Try to include a trailing newline.
              (narrow-to-region start (point))
              (require 'lisp-mnt)
              ;; Use some headers we've invented to drive the process.
              (let* ((requires-str (lm-header "package-requires"))
                     (requires (if requires-str
                                   (package-read-from-string requires-str)))
                     ;; Prefer Package-Version, because if it is
                     ;; defined the package author probably wants us
                     ;; to use it.  Otherwise try Version.
                      (or (package-strip-rcs-id (lm-header "package-version"))
                          (package-strip-rcs-id (lm-header "version"))))
                     (commentary (lm-commentary)))
                (unless pkg-version
                   "Package does not define a usable \"Version\" or 
\"Package-Version\" header"))
                ;; Turn string version numbers into list form.
                (setq requires
                       (lambda (elt)
                         (list (car elt)
                               (package-version-split (car (cdr elt)))))
                (set-text-properties 0 (length file-name) nil file-name)
                (set-text-properties 0 (length pkg-version) nil pkg-version)
                (set-text-properties 0 (length desc) nil desc)
                (vector file-name requires desc pkg-version commentary)))
          (error "Package missing a terminating comment")))
    (error "No starting comment for package")))

(defun package-tar-file-info (file)
  "Find package information for a tar file.
FILE is the name of the tar file to examine.
The return result is a vector like `package-buffer-info'."
  (unless (string-match "^\\(.+\\)-\\([0-9.]+\\)\\.tar$" file)
    (error "`%s' doesn't have a package-ish name" file))
  (let* ((pkg-name (file-name-nondirectory (match-string-no-properties 1 file)))
         (pkg-version (match-string-no-properties 2 file))
         ;; Extract the package descriptor.
         (pkg-def-contents (shell-command-to-string
                            ;; Requires GNU tar.
                            (concat "tar -xOf " file " "
                                    pkg-name "-" pkg-version "/"
                                    pkg-name "-pkg.el")))
         (pkg-def-parsed (package-read-from-string pkg-def-contents)))
    (unless (eq (car pkg-def-parsed) 'define-package)
      (error "%s-pkg.el doesn't contain `define-package' sexp" pkg-name))
    (let ((name-str (nth 1 pkg-def-parsed))
          (version-string (nth 2 pkg-def-parsed))
          (docstring (nth 3 pkg-def-parsed))
          (requires (nth 4 pkg-def-parsed))

          (readme (shell-command-to-string
                   ;; Requires GNU tar.
                   (concat "tar -xOf " file " "
                           pkg-name "-" pkg-version "/README"))))
      (unless (equal pkg-version version-string)
        (error "Inconsistent versions!"))
      (unless (equal pkg-name name-str)
        (error "Inconsistent names!"))
      ;; Kind of a hack.
      (if (string-match ": Not found in archive" readme)
          (setq readme nil))
      ;; Turn string version numbers into list form.
      (if (eq (car requires) 'quote)
          (setq requires (car (cdr requires))))
      (setq requires
             (lambda (elt)
               (list (car elt)
                     (package-version-split (car (cdr elt)))))
      (vector pkg-name requires docstring version-string readme))))

(defun package-install-buffer-internal (pkg-info type)
      (let* ((file-name (aref pkg-info 0))
             (requires (aref pkg-info 1))
             (desc (if (string= (aref pkg-info 2) "")
                       "No description available."
                     (aref pkg-info 2)))
             (pkg-version (aref pkg-info 3)))
        ;; Download and install the dependencies.
        (let ((transaction (package-compute-transaction nil requires)))
          (package-download-transaction transaction))
        ;; Install the package itself.
         ((eq type 'single)
          (package-unpack-single file-name pkg-version desc requires))
         ((eq type 'tar)
          (package-unpack (intern file-name) pkg-version))
          (error "Unknown type: %s" (symbol-name type))))
        ;; Try to activate it.

(defun package-install-from-buffer ()
  "Install a package from the current buffer.
The package is assumed to be a single .el file which
follows the elisp comment guidelines; see
info node `(elisp)Library Headers'."
  (package-install-buffer-internal (package-buffer-info) 'single))

(defun package-install-file (file)
  "Install a package from a file.
The file can either be a tar file or an Emacs Lisp file."
  (interactive "fPackage file name: ")
    (insert-file-contents-literally file)
     ((string-match "\\.el$" file) (package-install-from-buffer))
     ((string-match "\\.tar$" file)
      (package-install-buffer-internal (package-tar-file-info file) 'tar))
     (t (error "Unrecognized extension `%s'" (file-name-extension file))))))

(defun package-delete (name version)
  (require 'dired)                      ; for dired-delete-file
  (dired-delete-file (concat (file-name-as-directory package-user-dir)
                             name "-" version)
                     ;; FIXME: query user?

(defun package--encode (string)
  "Encode a string by replacing some characters with XML entities."
  ;; We need a special case for translating "&" to "&amp;".
  (let ((index))
    (while (setq index (string-match "[&]" string index))
      (setq string (replace-match "&amp;" t nil string))
      (setq index (1+ index))))
  (while (string-match "[<]" string)
    (setq string (replace-match "&lt;" t nil string)))
  (while (string-match "[>]" string)
    (setq string (replace-match "&gt;" t nil string)))
  (while (string-match "[']" string)
    (setq string (replace-match "&apos;" t nil string)))
  (while (string-match "[\"]" string)
    (setq string (replace-match "&quot;" t nil string)))

(defun package--make-rss-entry (title text)
  (let ((date-string (format-time-string "%a, %d %B %Y %T %z")))
    (concat "<item>\n"
            "<title>" (package--encode title) "</title>\n"
            ;; FIXME: should have a link in the web page.
            "<link>" package-archive-base "news.html</link>\n"
            "<description>" (package--encode text) "</description>\n"
            "<pubDate>" date-string "</pubDate>\n"

(defun package--make-html-entry (title text)
  (concat "<li> " (format-time-string "%B %e") " - "
          title " - " (package--encode text)
          " </li>\n"))

(defun package--update-file (file location text)
    (let ((old-buffer (find-buffer-visiting file)))
      (with-current-buffer (let ((find-file-visit-truename t))
                             (or old-buffer (find-file-noselect file)))
        (goto-char (point-min))
        (search-forward location)
        (insert text)
        (let ((file-precious-flag t))
        (unless old-buffer
          (kill-buffer (current-buffer)))))))

(defun package-maint-add-news-item (title description)
  "Add a news item to the ELPA web pages.
TITLE is the title of the news item.
DESCRIPTION is the text of the news item.
You need administrative access to ELPA to use this."
  (interactive "sTitle: \nsText: ")
  (package--update-file (concat package-archive-upload-base "elpa.rss")
                        (package--make-rss-entry title description))
  (package--update-file (concat package-archive-upload-base "news.html")
                        "New entries go here"
                        (package--make-html-entry title description)))

(defun package--update-news (package version description)
  "Update the ELPA web pages when a package is uploaded."
  (package-maint-add-news-item (concat package " version " version)

(defun package-upload-buffer-internal (pkg-info extension)
  "Upload a package whose contents are in the current buffer.
PKG-INFO is the package info, see `package-buffer-info'.
EXTENSION is the file extension, a string.  It can be either
\"el\" or \"tar\"."
      (let* ((file-type (cond
                         ((equal extension "el") 'single)
                         ((equal extension "tar") 'tar)
                         (t (error "Unknown extension `%s'" extension))))
             (file-name (aref pkg-info 0))
             (pkg-name (intern file-name))
             (requires (aref pkg-info 1))
             (desc (if (string= (aref pkg-info 2) "")
                       (read-string "Description of package: ")
                     (aref pkg-info 2)))
             (pkg-version (aref pkg-info 3))
             (commentary (aref pkg-info 4))
             (split-version (package-version-split pkg-version))
             (pkg-buffer (current-buffer))

             ;; Download latest archive-contents.
             (buffer (url-retrieve-synchronously
                      (concat package-archive-base "archive-contents"))))

        ;; Parse archive-contents.
        (set-buffer buffer)
        (re-search-forward "^$" nil 'move)
        (delete-region (point-min) (point))
        (let ((contents (package-read-from-string
                         (buffer-substring-no-properties (point-min)
              (new-desc (vector split-version requires desc file-type)))
          (if (> (car contents) package-archive-version)
              (error "Unrecognized archive version %d" (car contents)))
          (let ((elt (assq pkg-name (cdr contents))))
            (if elt
                (if (package-version-compare split-version
                                             (package-desc-vers (cdr elt))
                    (error "New package has smaller version: %s" pkg-version)
                  (setcdr elt new-desc))
              (setq contents (cons (car contents)
                                   (cons (cons pkg-name new-desc)
                                         (cdr contents))))))

          ;; Now CONTENTS is the updated archive contents.  Upload
          ;; this and the package itself.  For now we assume ELPA is
          ;; writable via file primitives.
          (let ((print-level nil)
                (print-length nil))
            (write-region (concat (pp-to-string contents) "\n")
                          (concat package-archive-upload-base

          ;; If there is a commentary section, write it.
          (when commentary
            (write-region commentary nil
                          (concat package-archive-upload-base
                                  (symbol-name pkg-name) "-readme.txt")))

          (set-buffer pkg-buffer)
          (kill-buffer buffer)
          (write-region (point-min) (point-max)
                        (concat package-archive-upload-base
                                file-name "-" pkg-version
                                "." extension)
                        nil nil nil 'excl)

          ;; Write a news entry.
          (package--update-news (concat file-name "." extension)
                                pkg-version desc)

          ;; special-case "package": write a second copy so that the
          ;; installer can easily find the latest version.
          (if (string= file-name "package")
              (write-region (point-min) (point-max)
                            (concat package-archive-upload-base
                                    file-name "." extension)
                            nil nil nil 'ask)))))))

(defun package-upload-buffer ()
  "Upload a single .el file to ELPA from the current buffer."
      ;; Find the package in this buffer.
      (let ((pkg-info (package-buffer-info)))
        (package-upload-buffer-internal pkg-info "el")))))

(defun package-upload-file (file)
  (interactive "fPackage file name: ")
    (insert-file-contents-literally file)
    (let ((info (cond
                 ((string-match "\\.tar$" file) (package-tar-file-info file))
                 ((string-match "\\.el$" file) (package-buffer-info))
                 (t (error "Unrecognized extension `%s'"
                           (file-name-extension file))))))
      (package-upload-buffer-internal info (file-name-extension file)))))

(defun package-gnus-summary-upload ()
  "Upload a package contained in the current *Article* buffer.
This should be invoked from the gnus *Summary* buffer."
    (set-buffer gnus-article-buffer)

(defun package--download-one-archive (file)
  "Download a single archive file and cache it locally."
  (let ((buffer (url-retrieve-synchronously
                 (concat package-archive-base file))))
      (set-buffer buffer)
      (re-search-forward "^$" nil 'move)
      (delete-region (point-min) (point))
      (setq buffer-file-name (concat (file-name-as-directory package-user-dir)
      (let ((version-control 'never))
      (kill-buffer buffer))))

(defun package-refresh-contents ()
  "Download the ELPA archive description if needed.
Invoking this will ensure that Emacs knows about the latest versions
of all packages.  This will let Emacs make them available for
  (package--download-one-archive "archive-contents")
  (package--download-one-archive "builtin-packages")

(defun package-initialize ()
  "Load all packages and activate as many as possible."
  (setq package-obsolete-alist nil)
  ;; Try to activate all our packages.
  (mapc (lambda (elt)
          (package-activate (car elt) (package-desc-vers (cdr elt))))


;;;; Package menu mode.

(defvar package-menu-mode-map nil
  "Local keymap for `package-menu-mode' buffers.")

(unless package-menu-mode-map
  (setq package-menu-mode-map (make-keymap))
  (suppress-keymap package-menu-mode-map)
  (define-key package-menu-mode-map "q" 'quit-window)
  (define-key package-menu-mode-map "n" 'next-line)
  (define-key package-menu-mode-map "p" 'previous-line)
  (define-key package-menu-mode-map "u" 'package-menu-mark-unmark)
  (define-key package-menu-mode-map "\177" 'package-menu-backup-unmark)
  (define-key package-menu-mode-map "d" 'package-menu-mark-delete)
  (define-key package-menu-mode-map "i" 'package-menu-mark-install)
  (define-key package-menu-mode-map "g" 'package-menu-revert)
  (define-key package-menu-mode-map "r" 'package-menu-refresh)
  (define-key package-menu-mode-map "~"
  (define-key package-menu-mode-map "x" 'package-menu-execute)
  (define-key package-menu-mode-map "h" 'package-menu-quick-help)
  (define-key package-menu-mode-map "?" 'package-menu-view-commentary)

(defvar package-menu-sort-button-map
  (let ((map (make-sparse-keymap)))
    (define-key map [header-line mouse-1] 'package-menu-sort-by-column)
    (define-key map [follow-link] 'mouse-face)
  "Local keymap for package menu sort buttons.")

(put 'package-menu-mode 'mode-class 'special)

(defun package-menu-mode ()
  "Major mode for browsing a list of packages.
Letters do not insert themselves; instead, they are commands.
  (use-local-map package-menu-mode-map)
  (setq major-mode 'package-menu-mode)
  (setq mode-name "Package Menu")
  (setq truncate-lines t)
  (setq buffer-read-only t)
  ;; Support Emacs 21.
  (if (fboundp 'run-mode-hooks)
      (run-mode-hooks 'package-menu-mode-hook)
    (run-hooks 'package-menu-mode-hook)))

(defun package-menu-refresh ()
  "Download the ELPA archive.
This fetches the file describing the current contents of
the Emacs Lisp Package Archive, and then refreshes the
package menu.  This lets you see what new packages are
available for download."

(defun package-menu-revert ()
  "Update the list of packages."

(defun package-menu-mark-internal (what)
  (unless (eobp)
    (let ((buffer-read-only nil))
      (delete-char 1)
      (insert what)

;; fixme numeric argument
(defun package-menu-mark-delete (num)
  "Mark a package for deletion and move to the next line."
  (interactive "p")
  (package-menu-mark-internal "D"))

(defun package-menu-mark-install (num)
  "Mark a package for installation and move to the next line."
  (interactive "p")
  (package-menu-mark-internal "I"))

(defun package-menu-mark-unmark (num)
  "Clear any marks on a package and move to the next line."
  (interactive "p")
  (package-menu-mark-internal " "))

(defun package-menu-backup-unmark ()
  "Back up one line and clear any marks on that package."
  (forward-line -1)
  (package-menu-mark-internal " ")
  (forward-line -1))

(defun package-menu-mark-obsolete-for-deletion ()
  "Mark all obsolete packages for deletion."
    (goto-char (point-min))
    (forward-line 2)
    (while (not (eobp))
      (if (looking-at ".*\\s obsolete\\s ")
          (package-menu-mark-internal "D")
        (forward-line 1)))))

(defun package-menu-quick-help ()
  "Show short key binding help for package-menu-mode."
  (message "n-ext, i-nstall, d-elete, u-nmark, x-ecute, r-efresh, h-elp"))

(defun package-menu-view-commentary ()
  "Display information about this package.
For single-file packages, shows the commentary section from the header.
For larger packages, shows the README file."
  (let* (start-point ok
         (pkg-name (package-menu-get-package))
         (buffer (url-retrieve-synchronously (concat package-archive-base
    (with-current-buffer buffer
      ;; FIXME: it would be nice to work with any URL type.
      (setq start-point url-http-end-of-headers)
      (setq ok (eq (url-http-parse-response) 200)))
    (let ((new-buffer (get-buffer-create "*Package Info*")))
      (with-current-buffer new-buffer
        (let ((buffer-read-only nil))
          (insert "Package information for " pkg-name "\n\n")
          (if ok
              (insert-buffer-substring buffer start-point)
            (insert "This package does not have a README file or commentary 
          (goto-char (point-min))
      (display-buffer new-buffer t))))

;; Return the name of the package on the current line.
(defun package-menu-get-package ()
    (if (looking-at ". \\([^ \t]*\\)")
        (match-string 1))))

;; Return the version of the package on the current line.
(defun package-menu-get-version ()
    (if (looking-at ". [^ \t]*[ \t]*\\([0-9.]*\\)")
        (match-string 1))))

(defun package-menu-get-status ()
    (if (looking-at ". [^ \t]*[ \t]*[^ \t]*[ \t]*\\([^ \t]*\\)")
        (match-string 1)

(defun package-menu-execute ()
  "Perform all the marked actions.
Packages marked for installation will be downloaded and
installed.  Packages marked for deletion will be removed.
Note that after installing packages you will want to restart
  (goto-char (point-min))
  (forward-line 2)
  (while (not (eobp))
    (let ((cmd (char-after))
          (pkg-name (package-menu-get-package))
          (pkg-vers (package-menu-get-version))
          (pkg-status (package-menu-get-status)))
       ((eq cmd ?D)
        (when (and (string= pkg-status "installed")
                   (string= pkg-name "package"))
          ;; FIXME: actually, we could be tricky and remove all info.
          ;; But that is drastic and the user can do that instead.
          (error "Can't delete most recent version of `package'"))
        ;; Ask for confirmation here?  Maybe if package status is ""?
        ;; Or if any lisp from package is actually loaded?
        (message "Deleting %s-%s..." pkg-name pkg-vers)
        (package-delete pkg-name pkg-vers)
        (message "Deleting %s-%s... done" pkg-name pkg-vers))
       ((eq cmd ?I)
        (package-install (intern pkg-name)))))

(defun package-print-package (package version key desc)
  (let ((face
         (cond ((eq package 'emacs) 'font-lock-builtin-face)
               ((string= key "available") 'default)
               ((string= key "installed") 'font-lock-comment-face)
               (t ; obsolete, but also the default.
                  ; is warning ok?
    (insert (propertize "  " 'font-lock-face face))
    (insert (propertize (symbol-name package) 'font-lock-face face))
    (indent-to 20 1)
    (insert (propertize (package-version-join version) 'font-lock-face face))
    (indent-to 30 1)
    (insert (propertize key 'font-lock-face face))
    ;; FIXME: this 'when' is bogus...
    (when desc
      (indent-to 41 1)
      (insert (propertize desc 'font-lock-face face)))
    (insert "\n")))

(defun package-list-maybe-add (package version status description result)
  (let ((elt (assoc (cons package version) result)))
    (unless elt
      (setq result (cons (list (cons package version) status description)

;; This decides how we should sort; nil means by package name.
(defvar package-menu-sort-key nil)

(defun package-list-packages-internal ()
  (package-initialize)                  ; FIXME: do this here?
  (with-current-buffer (get-buffer-create "*Packages*")
    (setq buffer-read-only nil)
    (let ((info-list))
      (mapc (lambda (elt)
              (setq info-list
                    (package-list-maybe-add (car elt)
                                            (package-desc-vers (cdr elt))
                                            ;; FIXME: it turns out to
                                            ;; be tricky to see if
                                            ;; this package is
                                            ;; presently activated.
                                            ;; That is lame!
                                            (package-desc-doc (cdr elt))
      (mapc (lambda (elt)
              (setq info-list
                    (package-list-maybe-add (car elt)
                                            (package-desc-vers (cdr elt))
                                            (package-desc-doc (cdr elt))
      (mapc (lambda (elt)
              (mapc (lambda (inner-elt)
                      (setq info-list
                            (package-list-maybe-add (car elt)
                                                     (cdr inner-elt))
                                                     (cdr inner-elt))
                    (cdr elt)))
      (let ((selector (cond
                       ((string= package-menu-sort-key "Version")
                        ;; FIXME this doesn't work.
                        #'(lambda (e) (cdr (car e))))
                       ((string= package-menu-sort-key "Status")
                        #'(lambda (e) (car (cdr e))))
                       ((string= package-menu-sort-key "Description")
                        #'(lambda (e) (car (cdr (cdr e)))))
                       (t ; "Package" is default.
                        #'(lambda (e) (symbol-name (car (car e))))))))
        (setq info-list
              (sort info-list
                    (lambda (left right)
                      (let ((vleft (funcall selector left))
                            (vright (funcall selector right)))
                        (string< vleft vright))))))
      (mapc (lambda (elt)
              (package-print-package (car (car elt))
                                     (cdr (car elt))
                                     (car (cdr elt))
                                     (car (cdr (cdr elt)))))
    (goto-char (point-min))

(defun package-menu-sort-by-column (&optional e)
  "Sort the package menu by the last column clicked on."
  (interactive (list last-input-event))
  (if e (mouse-select-window e))
  (let* ((pos (event-start e))
         (obj (posn-object pos))
         (col (if obj
                  (get-text-property (cdr obj) 'column-name (car obj))
                (get-text-property (posn-point pos) 'column-name))))
    (setq package-menu-sort-key col))

(defun package--list-packages ()
  "Display a list of packages.
Helper function that does all the work for the user-facing functions."
  (with-current-buffer (package-list-packages-internal)
    ;; Set up the header line.
    (setq header-line-format
           (lambda (pair)
             (let ((column (car pair))
                   (name (cdr pair)))
                ;; Insert a space that aligns the button properly.
                (propertize " " 'display (list 'space :align-to column)
                            'face 'fixed-pitch)
                ;; Set up the column button.
                (if (string= name "Version")
                  (propertize name
                              'column-name name
                              'help-echo "mouse-1: sort by column"
                              'mouse-face 'highlight
                              'keymap package-menu-sort-button-map)))))
           ;; We take a trick from buff-menu and have a dummy leading
           ;; space to align the header line with the beginning of the
           ;; text.  This doesn't really work properly on Emacs 21,
           ;; but it is close enough.
           '((0 . "")
             (2 . "Package")
             (20 . "Version")
             (30 . "Status")
             (41 . "Description"))

    ;; It's okay to use pop-to-buffer here.  The package menu buffer
    ;; has keybindings, and the user just typed 'M-x
    ;; package-list-packages', suggesting that they might want to use
    ;; them.
    (pop-to-buffer (current-buffer))))

(defun package-list-packages ()
  "Display a list of packages.
Fetches the updated list of packages before displaying.
The list is displayed in a buffer named `*Packages*'."

(defun package-list-packages-no-fetch ()
  "Display a list of packages.
Does not fetch the updated list of packages before displaying.
The list is displayed in a buffer named `*Packages*'."

;; Make it appear on the menu.
(define-key-after menu-bar-options-menu [package]
  '(menu-item "Manage Packages" package-list-packages
              :help "Install or uninstall additional Emacs packages"))


  (require 'reporter))

(defun package-report-bug ()
  "Submit a bug report for package.el via email."
  (require 'reporter)
   (concat "package.el " package-el-version)

(provide 'package)

;;; package.el ends here

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