1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
;;; lem-org.el -- Read lemmy posts in org mode -*- lexical-binding: t -*-
;; Copyright (C) 2023 Free Software Foundation, Inc.
;; Author: Yuchen Pei <id@ypei.org>
;; Package-Requires: ((emacs "28.2") (lem "0.1"))
;; Keywords: web, fediverse, org
;; Version: 0
;; This file is part of dotted.
;; dotted is free software: you can redistribute it and/or modify it under
;; the terms of the GNU Affero General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; dotted 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 Affero General
;; Public License for more details.
;; You should have received a copy of the GNU Affero General Public
;; License along with dotted. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Read lemmy posts in org mode. The entry point is `lem-org-open',
;; which takes the url of a lemmy post, and displays it in an org
;; buffer.
;; Note this package depends on lem.el:
;; <https://codeberg.org/martianh/lem.el>.
;; A major limitation is that it currently only fetches a set number
;; of comments `lem-org-comment-limit'.
;;; Code:
(require 'lem-api)
(defvar lem-org-comment-limit 50
"Number of comments to fetch for a post.")
(defun lem-org-parse-post-url (url)
"Parse a post URL into (host . post-id)."
(when (string-match "\\(.*\\)/post/\\(.*\\)" url)
`(,(match-string 1 url) . ,(match-string 2 url))))
(defun lem-org-get-post-and-comments (url)
"Get post and comments info from URL."
(when-let ((host-and-id (lem-org-parse-post-url url)))
;; The (local) binding of `lem-instance-url' and `lem-api-version'
;; are required by `lem-get-post' and `lem-api-get-post-comments'.
(let ((post-id (cdr host-and-id)))
(setq lem-instance-url (car host-and-id)
lem-api-version "v3")
(cons `(post . ,(lem-get-post post-id))
(lem-api-get-post-comments post-id "All" nil 50)))))
(defun lem-org-format-post (post)
"Format a POST."
(let* ((post-view (alist-get 'post_view post))
(post (alist-get 'post post-view))
(creator (alist-get 'creator post-view)))
(format
"%s\n\n%s"
(string-join
(list
"-*- org -*-"
(format "#+title: [[%s][%s]]"
(or (alist-get 'url post) (alist-get 'ap_id post))
(alist-get 'name post))
(format "#+date: %s" (alist-get 'published post))
(format "#+author: %s"
(or (alist-get 'display_name creator)
(alist-get 'name creator)))
(format "#+url: %s" (alist-get 'ap_id post)))
"\n")
(alist-get 'body post))))
(defun lem-org-comment-parent (comment)
"Get the id of the parent to COMMENT."
(let ((path (alist-get 'path (alist-get 'comment comment))))
(when (string-match ".*\\<\\(.*\\)\\..*" path)
(string-to-number (match-string 1 path)))))
(defun lem-org-sort-comments (comments)
"Annotate the lineage of COMMENTS.
For each comment, we look for its parent, and add the comment id
to the parent's children field."
(cl-loop
for comment in comments do
(when-let*
((target-id (lem-org-comment-parent comment))
(parent-idx (cl-position-if
(lambda (candidate)
(= (alist-get 'id (alist-get 'comment candidate))
target-id))
comments)))
(cl-pushnew
(alist-get 'id (alist-get 'comment comment))
(alist-get 'children (nth parent-idx comments))))))
(defun lem-org-format-heading (text level)
"Format a org heading of LEVEL with TEXT."
(format "%s %s"
(make-string level ?*) text))
(defun lem-org-format-comment (comment comments)
"Format all comments in a COMMENT tree recursively.
COMMENTS is the list of all comments for lookup of child
comments."
(let ((children (alist-get 'children comment))
(creator (alist-get 'creator comment))
(counts (alist-get 'counts comment))
(comment (alist-get 'comment comment)))
(cons
(format
"%s\n%s"
(lem-org-format-heading
(format "%s (+%d/-%d)"
(or (alist-get 'display_name creator)
(alist-get 'name creator))
(alist-get 'upvotes counts)
(alist-get 'downvotes counts))
(1- (length (split-string (alist-get 'path comment) "\\."))))
(alist-get 'content comment))
(mapcar
(lambda (child-id)
(lem-org-format-comment
(cl-find-if
(lambda (comment)
(= child-id (alist-get 'id (alist-get 'comment comment))))
comments)
comments))
children))))
(defun lem-org-format-comments (comments)
"Format COMMENTS.
Iterate over all comments and call `lem-org-format-comment' on
those at the top level."
(lem-org-sort-comments comments)
(string-join
(flatten-list
(mapcar
(lambda (comment)
(lem-org-format-comment comment comments))
(seq-filter
(lambda (comment)
(= 0 (lem-org-comment-parent comment)))
comments)))
"\n\n"))
(defun lem-org-open (url)
"Open a lemmy post at URL and display the result in an org buffer."
(interactive "sURL: ")
(let* ((post-and-comments (lem-org-get-post-and-comments url))
(post (lem-org-format-post (alist-get 'post post-and-comments)))
(comments (lem-org-format-comments
(alist-get 'comments post-and-comments))))
(with-current-buffer (get-buffer-create "*lem-org*")
(erase-buffer)
(insert post "\n\n" comments)
(goto-char (point-min))
(org-mode))
(display-buffer "*lem-org*")))
(provide 'lem-org)
;;; lem-org.el ends here
|
