* lisp/emacs-lisp/package.el: Don't recompute dir. Use pkg-descs more.
(package-desc): Add `dir' field. (package-desc-full-name): New function. (package-load-descriptor): Combine the two arguments. Don't use `load'. (package-maybe-load-descriptor): Remove. (package-load-all-descriptors): Just call package-load-descriptor. (package--disabled-p): New function. (package-desc-vers, package-desc-doc): Remove aliases. (package--dir): Remove function. (package-activate): Check if a package is disabled. (package-process-define-package): New function, extracted from define-package. (define-package): Turn into a place holder. (package-unpack-single, package-tar-file-info): Use package--description-file. (package-compute-transaction): Use package--disabled-p. (package-download-transaction): Don't call package-maybe-load-descriptor since they're all loaded anyway. (package-install): Change argument to be a pkg-desc. (package-delete): Use a single pkg-desc argument. (describe-package-1): Use package-desc-dir instead of package--dir. Use package-desc property instead of package-symbol. (package-install-button-action): Adjust accordingly. (package--push): Rewrite. (package-menu--print-info): Adjust accordingly. Change the ID format to be a pkg-desc. (package-menu-describe-package, package-menu-get-status) (package-menu--find-upgrades, package-menu-mark-upgrades) (package-menu-execute, package-menu--name-predicate): Adjust accordingly. * lisp/startup.el (package--description-file): New function. (command-line): Use it. * lisp/emacs-lisp/package-x.el (package-upload-buffer-internal): Use package-desc-version.
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