;;;; Reddit mode
;;;
;;; DEATH, 2008
;;; _ _ _ _ _
;;; _ __ ___ __| | __| (_) |_ _ __ ___ ___ __| | ___
;;; | '__/ _ \/ _` |/ _` | | __|____| '_ ` _ \ / _ \ / _` |/ _ \
;;; | | | __/ (_| | (_| | | ||_____| | | | | | (_) | (_| | __/
;;; |_| \___|\__,_|\__,_|_|\__| |_| |_| |_|\___/ \__,_|\___|
;;;
;;; A lot of stuff is missing:
;;;
;;; - logout
;;; - markdown
;;; - comments: edit/delete
;;; - submitting urls (incl. delete)
;;; - voting urls/comments
;;; - saving links
;;; - other pages (e.g. what's new/browse/saved/recommended/stats/blog)
;;; - user pages
;;; - user preferences
;;; - subreddits
;;; - search
;;; - customization
;;; - documentation
;;; - menus
;;; - error checking
;;; - much more...
;;;
(require 'cl)
(require 'thingatpt)
(require 'json)
(require 'url)
(require 'url-http)
(require 'tree-mode)
(require 'markdown-mode)
;;;; Variables
(defvar reddit-root "http://www.reddit.com")
(defvar reddit-api-root "http://www.reddit.com/api")
(defvar reddit-site "programming")
(defvar reddit-entry-format "%N. %[%T%] (%D, %C comments)\n")
(defvar reddit-user nil)
(defvar reddit-password nil)
(defvar reddit-entry-id nil)
(defvar reddit-parent-id nil)
(defvar reddit-kind-listing "Listing")
(defvar reddit-kind-comment "t1")
(defvar reddit-kind-entry "t3")
;;;; Utilities
(defmacro reddit-alet (vars alist &rest forms)
(let ((alist-var (make-symbol "alist")))
`(let* ((,alist-var ,alist)
,@(loop for var in vars
collecting `(,var (assoc-default ',var ,alist-var))))
,@forms)))
(put 'reddit-alet 'lisp-indent-function 2)
(defun reddit-kill ()
(interactive)
(let ((buffer (current-buffer)))
(unless (one-window-p)
(delete-window))
(kill-buffer buffer)))
(defun reddit-chomp (s)
(if (string-match "\\(.*\\)\n" s)
(match-string 1 s)
s))
(defun reddit-check-status (status)
(when (eq (car status) :error)
(destructuring-bind (sym . data) (cadr status)
(signal sym data))))
(defun reddit-format-request-data (alist)
(with-temp-buffer
(loop for delim = "" then "&"
for (key . value) in alist
do (insert delim key "=" value))
(buffer-string)))
;;;; Reddit-specific utilities
(defun reddit-parse ()
(goto-char (point-min))
(re-search-forward "^$")
(json-read))
(defun reddit-api (op data)
(let* ((url-request-method "POST")
(url-request-extra-headers
'(("Content-Type" . "application/x-www-form-urlencoded")))
(url-request-data
(reddit-format-request-data
(append data
`(("r" . ,(or reddit-site "%20reddit.com"))
("_" . "")))))
(buffer (url-retrieve-synchronously (concat reddit-api-root "/" op))))
(when (null buffer)
(error "Reddit API call for '%s' failed" op))
(with-current-buffer buffer
(save-excursion
(let ((code (url-http-parse-response)))
(case code
(200)
(t
(url-mark-buffer-as-dead buffer)
(error "Reddit API call for '%s' failed with code %d" op code))))))
buffer))
(defun reddit-login (&optional user password)
(interactive)
(when (null user)
(setq user (read-string "User: " nil nil reddit-user)))
(when (null password)
(setq password (read-passwd "Password: " nil reddit-password)))
(with-current-buffer
(reddit-api "login"
`(("uh" . "")
("op" . "login-main")
("user_login" . ,user)
("passwd_login" . ,password)))
(url-mark-buffer-as-dead (current-buffer))
(let* ((data (reddit-parse))
(error (assoc-default 'error data)))
(if error
(error "Problem with login: %s"
(assoc-default 'message error nil "<no message>"))
(message "Login successful")))))
(defun reddit-site-root ()
(if reddit-site
(concat reddit-root "/r/" reddit-site)
reddit-root))
(defun reddit-comments-site-root (entry-id)
(concat (reddit-site-root) "/info/" entry-id "/comments"))
(defun reddit-modhash (entry-id)
;; Ugly, ugly hack
(let ((modhash (with-current-buffer
(url-retrieve-synchronously (reddit-comments-site-root entry-id))
(url-mark-buffer-as-dead (current-buffer))
(goto-char (point-min))
(re-search-forward "modhash = '\\([^']*\\)")
(match-string 1))))
(if (equal modhash "")
(error "Can't find modhash; not logged in?")
modhash)))
;;;; Reddit mode
(defun reddit ()
"Switch to Reddit buffer, creating it if necessary."
(interactive)
(cond ((get-buffer "*Reddit*")
(switch-to-buffer "*Reddit*"))
(t
(switch-to-buffer "*Reddit*")
(reddit-mode)
(when reddit-user
(reddit-login reddit-user reddit-password))
(reddit-refresh))))
(defvar reddit-mode-map
(let ((map (make-sparse-keymap)))
(set-keymap-parent map widget-keymap)
(define-key map "q" 'quit-window)
(define-key map "g" 'reddit-refresh)
(define-key map "c" 'reddit-comments)
(define-key map "L" 'reddit-login)
map))
(define-derived-mode reddit-mode nil "Reddit"
"Major mode for using Reddit."
(widen)
(setq buffer-read-only t)
(auto-save-mode 0))
(defun reddit-refresh ()
(interactive)
(url-retrieve (concat (reddit-site-root) "/.json")
'reddit-refresh-cb
(list (current-buffer))))
(defun reddit-refresh-cb (status buffer)
(url-mark-buffer-as-dead (current-buffer))
(reddit-check-status status)
(reddit-render (reddit-parse) buffer))
(defun reddit-render (data buffer)
(let ((inhibit-read-only t))
(with-current-buffer buffer
(erase-buffer)
(let ((kind (assoc-default 'kind data)))
(assert (equal reddit-kind-listing kind))
(let ((children (assoc-default 'children (car data))))
(loop for n from 0
for child across children
do (widget-create (reddit-make-entry child n)))))
(widget-setup)
(goto-char (point-min))))
(message "Got entries"))
(define-widget 'reddit-entry 'url-link
"A widget representing a Reddit entry."
:format-handler 'reddit-entry-format)
(defun reddit-make-entry (data n)
(let ((kind (assoc-default 'kind data)))
(assert (equal reddit-kind-entry kind))
(reddit-alet (ups saved hidden id likes score created title downs
num_comments url author name clicked domain)
(assoc-default 'data data)
(list 'reddit-entry
:format reddit-entry-format
:value url
:help-echo url
:tab-order n
:reddit-title title
:reddit-entry-id id
:reddit-n n
:reddit-domain domain
:reddit-score score
:reddit-author author
:reddit-num-comments num_comments))))
(defun reddit-entry-format (widget char)
(case char
(?N (insert (format "%2d" (1+ (widget-get widget :reddit-n)))))
(?D (insert (widget-get widget :reddit-domain)))
(?T (insert (truncate-string-to-width (widget-get widget :reddit-title) 80 nil nil t)))
(?S (insert (format "%d" (widget-get widget :reddit-score))))
(?A (insert (widget-get widget :reddit-author)))
(?C (insert (format "%d" (widget-get widget :reddit-num-comments))))
(t (widget-default-format-handler widget char))))
;;;; Reddit Comments mode
(defun reddit-comments ()
(interactive)
(let ((widget (widget-at)))
(when widget
(reddit-comments-new-buffer (widget-get widget :reddit-entry-id)))))
(define-derived-mode reddit-comments-mode tree-mode "Reddit Comments"
(widen)
(setq buffer-read-only t)
(auto-save-mode 0))
(define-key reddit-comments-mode-map "q" 'reddit-kill)
(define-key reddit-comments-mode-map "g" 'reddit-comments-refresh)
(define-key reddit-comments-mode-map "a" 'reddit-comments-post)
(define-key reddit-comments-mode-map "F" 'reddit-comments-followup)
(defun reddit-comments-new-buffer (id)
(with-current-buffer (get-buffer-create (format "*Reddit Comments %s*" id))
(reddit-comments-mode)
(switch-to-buffer (current-buffer))
(set (make-local-variable 'reddit-entry-id) id)
(reddit-comments-refresh)))
(defun reddit-comments-refresh ()
(interactive)
(url-retrieve (concat (reddit-comments-site-root reddit-entry-id) "/.json")
'reddit-comments-refresh-cb
(list (current-buffer))))
(defun reddit-comments-refresh-cb (status buffer)
(url-mark-buffer-as-dead (current-buffer))
(reddit-check-status status)
(reddit-comments-render (reddit-parse) buffer))
(defun reddit-comments-render (data buffer)
(with-current-buffer buffer
(let ((inhibit-read-only t))
(erase-buffer)
;; The first element of data contains the reddit entry. The
;; second element of data contains all the comments.
(if (or (not (arrayp data))
(< (length data) 2))
(error "Weird data: %s" data)
(let* ((data (assoc-default 'data (aref data 1)))
(children (assoc-default 'children data))
(trees (reddit-comments-trees children)))
(dolist (tree trees)
(tree-mode-expand-level-1 (tree-mode-insert tree) -1))
(goto-char (point-min))
(message "Got comments"))))))
(define-widget 'reddit-comment-widget 'tree-widget
"A widget representing a Reddit comment.")
(define-widget 'reddit-comment-line-widget 'text
"A widget representing a Reddit comment's line.")
(defun reddit-comments-trees (data)
(if (arrayp data)
(loop for x across data
appending (reddit-comments-trees x))
(let ((kind (assoc-default 'kind data)))
(cond ((equal reddit-kind-listing kind)
(reddit-comments-trees (assoc-default 'children (assoc-default 'data data) nil [])))
((equal reddit-kind-comment kind)
(reddit-alet (ups replies likes id author downs created name body)
(assoc-default 'data data)
`((reddit-comment-widget
:reddit-comment-id ,id
:reddit-author ,author
:node (push-button :tag ,author :format "%t\n")
,@(reddit-comments-body-widgets body)
,@(when replies
(reddit-comments-trees replies))))))
(t (warn "reddit-comments-trees: unknown kind: %s" kind))))))
(defun reddit-comments-body-widgets (body)
(with-temp-buffer
(insert body)
(goto-char (point-min))
(while (search-forward "\r" nil t)
(replace-match "\n" nil t))
(fill-region (point-min) (point-max))
(goto-char (point-min))
(let ((widgets '())
(blank nil))
(while (not (eobp))
(let ((line (reddit-chomp (thing-at-point 'line))))
(cond ((equal "" line)
(setq blank t))
(t
(when blank
(push `(reddit-comment-line-widget "") widgets)
(setq blank nil))
(push `(reddit-comment-line-widget ,line) widgets))))
(forward-line))
(nreverse widgets))))
(defun reddit-comments-current-comment ()
(labels ((lookup (widget)
(cond ((null widget)
nil)
((not (eq 'reddit-comment-widget (widget-type widget)))
(lookup (widget-get widget :parent)))
(t
widget))))
(lookup (tree-mode-icon-current-line))))
(defun reddit-comments-post ()
(interactive)
(reddit-post-new-buffer `(entry ,reddit-entry-id) reddit-entry-id))
(defun reddit-comments-followup ()
(interactive)
(let ((comment (reddit-comments-current-comment)))
(if (null comment)
(error "No comment for followup")
(reddit-post-new-buffer
`(comment ,(widget-get comment :reddit-comment-id)
,(widget-get comment :reddit-author))
reddit-entry-id))))
;;;; Reddit Post mode
(defun reddit-post-new-buffer (parent-id entry-id)
(with-current-buffer (get-buffer-create (format "*Reddit Post %s*" parent-id))
(reddit-post-mode)
(set (make-local-variable 'reddit-parent-id) parent-id)
(set (make-local-variable 'reddit-entry-id) entry-id)
(set-window-buffer (split-window) (current-buffer))
(select-window (next-window))))
(define-derived-mode reddit-post-mode markdown-mode "Reddit-Post"
(widen)
(auto-save-mode 0))
(define-key reddit-post-mode-map (kbd "C-c C-q") 'reddit-kill)
(define-key reddit-post-mode-map (kbd "C-c C-c") 'reddit-post-save)
(defun reddit-post-save ()
(interactive)
(destructuring-bind (type parent-id author) reddit-parent-id
(let ((modhash (reddit-modhash entry-id))
(id-string (concat (ecase type
(comment reddit-kind-comment)
(entry reddit-kind-entry))
"_"
parent-id))
(comment (url-hexify-string (buffer-string))))
(url-mark-buffer-as-dead
(reddit-api "comment"
`(("uh" . ,modhash)
("id" . ,id-string)
("comment" . ,comment)
,@(when (eq type 'entry)
`(("isroot" . "1"))))))
(reddit-kill)
(message "Posted followup to comment by %s" author))))
;;;; Finally...
(provide 'reddit)
) is private.
