diff options
Diffstat (limited to 'sx-question-list.el')
| -rw-r--r-- | sx-question-list.el | 57 |
1 files changed, 40 insertions, 17 deletions
diff --git a/sx-question-list.el b/sx-question-list.el index 0234d62..026eff8 100644 --- a/sx-question-list.el +++ b/sx-question-list.el @@ -148,10 +148,12 @@ Also see `sx-question-list-refresh'." 'face 'sx-question-list-tags) (propertize " " 'display "\n"))))))) -(defvar sx-question-list--refresh-function - (lambda () - (sx-question-get-questions - sx-question-list--current-site)) +(defvar sx-question-list--pages-so-far 0 + "Number of pages currently being displayed. +This variable gets reset to 0 before every refresh. +It should be used by `sx-question-list--next-page-function'.") + +(defvar sx-question-list--refresh-function nil "Function used to refresh the list of questions to be displayed. Used by `sx-question-list-mode', this is a function, called with no arguments, which returns a list questions to be displayed, @@ -161,7 +163,14 @@ If this is not set, the value of `sx-question-list--dataset' is used, and the list is simply redisplayed.") (make-variable-buffer-local 'sx-question-list--refresh-function) -(defvar sx-question-list--next-page-function nil +(defvar sx-question-list--next-page-function + (lambda () + (or (sx-question-get-questions + sx-question-list--current-site + (cl-incf sx-question-list--pages-so-far)) + ;; If the `get' failed, don't increment. + (and (cl-decf sx-question-list--pages-so-far) + nil))) "Function used to fetch the next page of questions to be displayed. Used by `sx-question-list-mode'. This is a function, called with no arguments, which returns a list questions to be displayed, @@ -196,27 +205,38 @@ following variables: 1. `sx-question-list--print-function' 2. `sx-question-list--refresh-function' - 3. `sx-question-list--dataset' - 4. `sx-question-list--next-page-function' + 3. `sx-question-list--next-page-function' + 4. `sx-question-list--dataset' \\<sx-question-list-mode-map> If none of these is configured, the behaviour is that of a \"Frontpage\", for the site given by `sx-question-list--current-site'. -As long as one of 2, 3, or 4 is provided, the other are entirely -optional. - - If function 2 is not given, the value of 3 is used instead. - - If 3 is also not given, it is populated by calling 4. - - If 4 is also not given, the page will display nothing. +Function 1 is mandatory, but it also has a sane default which is +usually enough. + +As long as one of 2, 3, or 4 is provided, the other two are +entirely optional. Populating or refreshing the list of questions +is done in the following way: + - Set `sx-question-list--pages-so-far' to 0. + - Call function 2. + - If function 2 is not given, call function 3 instead. + - If 3 is also not given, it has a safe default (see the doc). + - If 3 is set to nil use the value of 4. -For beter integration, items 2 and 4 should take into +For better integration, items 2 and 3 should take into consideration the variable `sx-question-list--current-site'. If the application in question has no use for this variable, it should unbind \\[sx-question-list-switch-site]. +Function 3 should probably use the value of +`sx-question-list--pages-so-far'. If it does, it needs to update +the value manually. + \\{sx-question-list-mode-map}" (hl-line-mode 1) (sx-question-list--update-mode-line) + (setq sx-question-list--pages-so-far 0) (setq tabulated-list-format [(" V" 3 t :right-align t) (" A" 3 t :right-align t) @@ -339,11 +359,14 @@ a new list before redisplaying." (interactive "p\nP") ;; Reset the mode-line unread count (we rebuild it here). (setq sx-question-list--unread-count 0) + (setq sx-question-list--pages-so-far 0) (let ((question-list - (if (or no-update - (null (functionp sx-question-list--refresh-function))) - sx-question-list--dataset - (funcall sx-question-list--refresh-function)))) + (or (and no-update sx-question-list--dataset) + (and (functionp sx-question-list--refresh-function) + (funcall sx-question-list--refresh-function)) + (and (functionp sx-question-list--next-page-function) + (funcall sx-question-list--next-page-function)) + sx-question-list--dataset))) (setq sx-question-list--dataset question-list) ;; Print the result. (setq tabulated-list-entries |