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;;; sx-interaction.el --- Voting, commenting, and otherwise interacting with questions. -*- lexical-binding: t; -*-
;; Copyright (C) 2014 Artur Malabarba
;; Author: Artur Malabarba <bruce.connor.am@gmail.com>
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(require 'sx)
(require 'sx-question)
(require 'sx-question-mode)
(require 'sx-question-list)
;;; Using data in buffer
(defun sx--data-here (&optional noerror)
"Get data for the question or other object under point.
If NOERROR is non-nil, don't throw an error on failure.
This looks at the text property `sx--data-here'. If it's not set,
it looks at a few other reasonable variables. If those fail too,
it throws an error."
(or (get-text-property (point) 'sx--data-here)
(and (derived-mode-p 'sx-question-list-mode)
(tabulated-list-get-id))
(and (derived-mode-p 'sx-question-mode)
sx-question-mode--data)
(and (null noerror)
(error "No question data found here"))))
(defun sx--maybe-update-display ()
"Refresh the question list if we're inside it."
(cond
((derived-mode-p 'sx-question-list-mode)
(sx-question-list-refresh 'redisplay 'no-update))
((derived-mode-p 'sx-question-mode)
(sx-question-mode-refresh 'no-update))))
(defun sx--copy-data (from to)
"Copy all fields of alist FORM onto TO.
Only fields contained in TO are copied."
(setcar to (car from))
(setcdr to (cdr from)))
;;; Visiting
(defun sx-visit (data &optional copy-as-kill)
"Visit DATA in a web browser.
DATA can be a question, answer, or comment. Interactively, it is
derived from point position.
If copy-as-kill is non-nil, do not call `browse-url'.
Instead, copy the link as a new kill with `kill-new'.
Interactively, this is specified with a prefix argument.
If DATA is a question, also mark it as read."
(interactive (list (sx--data-here) current-prefix-arg))
(sx-assoc-let data
(let ((link
(when (stringp .link)
(funcall (if copy-as-kill #'kill-new #'browse-url)
.link))))
(when (and (called-interactively-p 'any) copy-as-kill)
(message "Copied: %S" link)))
(when (and .title (not copy-as-kill))
(sx-question--mark-read data)
(sx--maybe-update-display))))
;;; Displaying
(defun sx-display-question (&optional data focus window)
"Display question given by DATA, on WINDOW.
When DATA is nil, display question under point. When FOCUS is
non-nil (the default when called interactively), also focus the
relevant window.
If WINDOW nil, the window is decided by
`sx-question-mode-display-buffer-function'."
(interactive (list (sx--data-here) t))
(when (sx-question--mark-read data)
(sx--maybe-update-display))
;; Display the question.
(setq window
(get-buffer-window
(sx-question-mode--display data window)))
(when focus
(if (window-live-p window)
(select-window window)
(switch-to-buffer sx-question-mode--buffer))))
;;; Voting
(defun sx-toggle-upvote (data)
"Apply or remove upvote from DATA.
DATA can be a question, answer, or comment. Interactively, it is
guessed from context at point."
(interactive (list (sx--data-here)))
(sx-assoc-let data
(sx-set-vote data "upvote" (null (eq .upvoted t)))))
(defun sx-toggle-downvote (data)
"Apply or remove downvote from DATA.
DATA can be a question or an answer. Interactively, it is guessed
from context at point."
(interactive (list (sx--data-here)))
(sx-assoc-let data
(sx-set-vote data "downvote" (null (eq .downvoted t)))))
(defun sx-set-vote (data type status)
"Set the DATA's vote TYPE to STATUS.
DATA can be a question, answer, or comment. TYPE can be
\"upvote\" or \"downvote\". STATUS is a boolean.
Besides posting to the api, DATA is also altered to reflect the
changes."
(let ((result
(sx-assoc-let data
(sx-method-call
(cond
(.comment_id "comments")
(.answer_id "answers")
(.question_id "questions"))
:id (or .comment_id .answer_id .question_id)
:submethod (concat type (unless status "/undo"))
:auth 'warn
:url-method "POST"
:filter sx-browse-filter
:site .site))))
;; The api returns the new DATA.
(when (> (length result) 0)
(sx--copy-data (elt result 0) data)
;; Display the changes in `data'.
(sx--maybe-update-display))))
;;; Commenting
(defun sx-comment (data &optional text)
"Post a comment on DATA given by TEXT.
DATA can be a question, an answer, or a comment. Interactively,
it is guessed from context at point.
If DATA is a comment, the comment is posted as a reply to it.
TEXT is a string. Interactively, it is read from the minibufer."
(interactive (list (sx--data-here) 'query))
;; When clicking the "Add a Comment" button, first arg is a marker.
(when (markerp data)
(setq data (sx--data-here))
(setq text 'query))
(sx-assoc-let data
;; Get the comment text
(when (eq text 'query)
(setq text (read-string
"Comment text: "
(when .comment_id
(concat (sx--user-@name .owner) " "))))
(while (< (string-width text) 15)
(setq text (read-string "Comment text (at least 15 characters): " text))))
;; If non-interactive, `text' could be anything.
(unless (stringp text)
(error "Comment body must be a string"))
;; And post
(let ((result
(sx-method-call 'posts
:id (or .post_id .answer_id .question_id)
:submethod "comments/add"
:auth 'warn
:url-method "POST"
:filter sx-browse-filter
:site .site
:keywords `((body ,text)))))
;; The api returns the new DATA.
(when (> (length result) 0)
(sx--add-comment-to-object
(elt result 0)
(if .post_id
(sx--get-post .post_type .site .post_id)
data))
;; Display the changes in `data'.
(sx--maybe-update-display)))))
(defun sx--get-post (type site id)
"Find in the database a post identified by TYPE, SITE and ID.
TYPE is `question' or `answer'.
SITE is a string.
ID is an integer."
(let ((db (cons sx-question-mode--data
sx-question-list--dataset)))
(setq db
(cond
((string= type "question") db)
((string= type "answer")
(apply #'cl-map 'list #'identity
(mapcar (lambda (x) (cdr (assoc 'answers x))) db)))))
(car (cl-member-if
(lambda (x) (sx-assoc-let x
(and (equal (or .answer_id .question_id) id)
(equal .site site))))
db))))
(defun sx--add-comment-to-object (comment object)
"Add COMMENT to OBJECT's `comments' property.
OBJECT can be a question or an answer."
(let ((com-cell (assoc 'comments object)))
(if com-cell
(progn
(setcdr
com-cell
(apply #'vector
(append
(cl-map 'list #'identity
(cdr com-cell))
(list comment)))))
;; No previous comments, add it manually.
(setcdr object (cons (car object) (cdr object)))
(setcar object `(comments . [,comment])))))
(provide 'sx-interaction)
;;; sx-interaction.el ends here
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