emacs: Generalize buffer interface.
Extract the code for defining buffer interface from "guix-base.el",
generalize it and move to "guix-buffer.el".
* emacs.am (ELFILES): Add "emacs/guix-buffer.el".
* emacs/guix-base.el (guix-profile, guix-entries, guix-buffer-type)
(guix-entry-type, guix-search-type, guix-search-vals, guix-set-vars)
(guix-get-symbol, guix-show-entries, guix-get-show-entries)
(guix-set-buffer, guix-history-call, guix-make-history-item)
(guix-get-params-for-receiving): Remove.
(guix-switch-to-buffer): Rename to 'guix-buffer-display' and move to
"guix-buffer.el".
(guix-get-entries): Rename to 'guix-ui-get-entries' and move to
"guix-ui.el".
(guix-buffer-data, guix-buffer-value, guix-buffer-param-title)
(guix-buffer-name, guix-buffer-history-size)
(guix-buffer-revert-confirm?, guix-buffer-map, guix-buffer-revert)
(guix-buffer-after-redisplay-hook, guix-buffer-redisplay)
(guix-buffer-redisplay-goto-button): Move to...
* emacs/guix-buffer.el: ... here. New file.
(guix-buffer-item): New variable.
(guix-buffer-with-item, guix-buffer-with-current-item)
(guix-buffer-define-current-item-accessor)
(guix-buffer-define-current-item-accessors)
(guix-buffer-define-current-args-accessor)
(guix-buffer-define-current-args-accessors): New macros.
(guix-buffer-get-entries, guix-buffer-mode-enable)
(guix-buffer-mode-initialize, guix-buffer-insert-entries)
(guix-buffer-show-entries-default, guix-buffer-show-entries)
(guix-buffer-message, guix-buffer-history-item, guix-buffer-set)
(guix-buffer-display-entries-current)
(guix-buffer-get-display-entries-current)
(guix-buffer-display-entries, guix-buffer-get-display-entries): New
procedures.
* emacs/guix-info.el: Adjust for the procedures renaming.
(guix-info-define-interface): Add ':show-entries-function' keyword.
* emacs/guix-list.el: Likewise.
* emacs/guix-ui.el (guix-ui-define-interface): Generate
'guix-ENTRY-TYPE-BUFFER-TYPE-get-entries' procedure based on
'guix-ui-get-entries'.
* emacs/guix.el (guix-get-show-packages, guix-get-show-generations):
Adjust for the procedures renaming.
6c40b7b703