Function: package-process-define-package

package-process-define-package is a byte-compiled function defined in package.el.gz.

Signature

(package-process-define-package EXP)

Documentation

Process define-package expression EXP and push it to package-alist.

EXP should be a form read from a foo-pkg.el file. Convert EXP into a package-desc object using the package-desc-from-define constructor before pushing it to package-alist.

If there already exists a package by the same name in package-alist, insert this object there such that the packages are sorted with the highest version first.

Source Code

;; Defined in /usr/src/emacs/lisp/emacs-lisp/package.el.gz
(defun package-process-define-package (exp)
  "Process define-package expression EXP and push it to `package-alist'.
EXP should be a form read from a foo-pkg.el file.
Convert EXP into a `package-desc' object using the
`package-desc-from-define' constructor before pushing it to
`package-alist'.

If there already exists a package by the same name in
`package-alist', insert this object there such that the packages
are sorted with the highest version first."
  (when (eq (car-safe exp) 'define-package)
    (let* ((new-pkg-desc (apply #'package-desc-from-define (cdr exp)))
           (name (package-desc-name new-pkg-desc))
           (version (package-desc-version new-pkg-desc))
           (old-pkgs (assq name package-alist)))
      (if (null old-pkgs)
          ;; If there's no old package, just add this to `package-alist'.
          (push (list name new-pkg-desc) package-alist)
        ;; If there is, insert the new package at the right place in the list.
        (while
            (if (and (cdr old-pkgs)
                     (version-list-< version
                                     (package-desc-version (cadr old-pkgs))))
                (setq old-pkgs (cdr old-pkgs))
              (push new-pkg-desc (cdr old-pkgs))
              nil)))
      new-pkg-desc)))