Support filtering by keywords in package listings.
* emacs-lisp/package.el (package-built-in-p): Support both built-in and the package.el converted package descriptions. (package-show-package-list): Allow keywords. (package-keyword-button-action): Use it instead of `finder-list-matches'. (package-menu-filter-interactive): Interactive filtering (by keyword) function. (package-menu--generate): Support keywords and change keymappings and headers when they are given. (package--has-keyword-p): Helper function. (package-menu--refresh): Use it. (package--mapc): Helper function. (package-all-keywords): Use it. (package-menu-mode-map): Set up menu items and keybindings to provide a filtering UI.
Showing with 124 additions and 20 deletions