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;;; stack-core.el --- lisp-to-org conversion functions for stack-mode -*- lexical-binding: t; -*-
;; Copyright (C) 2014 Artur Malabarba
;; Author: Artur Malabarba <bruce.connor.am@gmail.com>
;; Keywords: help, hypermedia, mail, news, tools
;; 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:
;;; Requirements
(require 'stack-core)
(require 'json)
(require 'shr)
(defun stack-lto--question (data)
"Return question DATA in a format acceptable by `org-element-interpret-data'.
DATA is a list of cons cells representing a question, as received
by the API and read by `json-read'."
`(headline (:title ,(cdr (assoc 'title data))
:level 1
:tags ,(mapcar #'identity (cdr (assoc 'tags data))))
(section ()
(headline (:title "Question" :level 2)
,(stack-lto--question-answer data))
,@(mapcar #'stack-lto--answer (cdr (assoc 'answers data))))))
(defun stack-lto--answer (data)
"Return answer DATA in a format acceptable by `org-element-interpret-data'.
DATA is a list of cons cells representing a question, as received
by the API and read by `json-read'."
;; Right now this doesn't do anything special. But it should check
;; whether the answer is accepted. How do we display that?
`(headline (:title "Answer" :level 2)
,(stack-lto--question-answer data)))
(defun stack-lto--question-answer (data)
"Process and return the elements of DATA which questions and answers have in common."
(let ((comments
(mapcar #'stack-lto--comment (cdr (assoc 'comments data)))))
`(,(if stack-lto-body-src-block
;; Body as a src block (really NOT nice).
`(src-block (:value ,(stack-lto--body data)
. ,stack-lto-body-src-block))
;; Body as html. Nicer...
(list 'paragraph () (stack-lto--body-rendered data)))
;; Comments as descriptive lists. If there are no comments, an
;; empty list would throw an error.
,@(when comments `((plain-list (:type descriptive) ,comments))))))
;;; Body rendering
(defvar stack-lto-body-src-block
'(:language "markdown" :switches nil :parameters nil :hiddenp nil)
"Properties used on the src-block which represents the body.
If this is nil, rendered html is used for the body instead.")
(defface stack-lto-body
'((((background light)) :background "Grey90")
(((background dark)) :background "Grey10"))
"Face used on the body content of questions and answers."
:group 'stack-mode-faces)
(defcustom stack-lto-bullet (if (char-displayable-p ?•) " •" " -")
"Bullet used on the display of html lists."
:type 'string
:group 'stack-mode)
(defun stack-lto--body (data)
"Get and cleanup `body_markdown' from DATA."
(concat
(replace-regexp-in-string
"\r\n" "\n" (cdr (assoc 'body_markdown data)))
"\n"))
;; We need to add padding in case the body contains a * at column 1
;; (which would break org-mode).
(defvar stack-lto--padding
(propertize " " 'display " ")
"Left-padding added to each line of a body.")
(defun stack-lto--body-rendered (data)
"Get and cleanup `body' from DATA.
Render it with `shr-render-region'."
(propertize
(with-temp-buffer
(insert (cdr (assoc 'body data)))
(let ((shr-bullet stack-lto-bullet))
(shr-render-region (point-min) (point-max)))
(goto-char (point-min))
(while (null (eobp))
(insert stack-lto--padding)
(forward-line 1))
(buffer-string))
'font-lock-face 'stack-lto-body))
(defvar stack-lto-comment-item
'(:bullet "- " :checkbox nil :counter nil :hiddenp nil)
"Properties used on the items which represent comments.")
(defun stack-lto--comment (data)
""
(let* ((owner (cdr (assoc 'owner data)))
(owner-name (cdr (assoc 'display_name owner))))
`(item (:tag ,owner-name . ,stack-lto-comment-item)
(paragraph () ,(cdr (assoc 'body_markdown data))))))
(provide 'stack-lto)
;;; stack-core.el ends here
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