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wombag-show.el
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wombag-show.el
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;;; wombag-show.el --- Wombag article interface -*- lexical-binding: t; -*-
;; Copyright (C) 2023 Karthik Chikmagalur
;; Author: Karthik Chikmagalur <[email protected]>
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Wombag article interface
;;; Code:
(require 'cl-lib)
(require 'shr)
(require 'browse-url)
(require 'bookmark)
(require 'wombag-options)
(require 'wombag-heading)
(require 'wombag-db)
(declare-function w-search-buffer "wombag-search")
(bookmark-maybe-load-default-file)
(defun w-show-buffer ()
"Return the Wombag entry buffer."
(get-buffer "*wombag-entry*"))
(defvar-local w-show-entry nil
"The Wombag entry displayed in this buffer.")
;;; Bookmarks
;;;###autoload
(defun w-show-bookmark-handler (record)
"Show the bookmarked entry saved in the `RECORD'."
(let* ((id (bookmark-prop-get record 'id))
(entry (car (w-db-get-ids id)))
(position (bookmark-get-position record)))
(set-buffer (w-show-entry entry))
(goto-char position)))
(defun w-show-bookmark-make-record ()
"Save the current position and the entry into a bookmark."
(let ((id (alist-get 'id w-show-entry))
(position (point))
(title (alist-get 'title w-show-entry)))
`(,(format "(Wombag) \"%s\"" title)
(id . ,id)
;; (location . ,title)
(position . ,position)
(handler . w-show-bookmark-handler))))
;;; Saving entry positions
(defvar w-show--positions-file
(file-name-concat w-dir "positions.eld"))
(defvar w-show--positions-table
(if (file-exists-p w-show--positions-file)
(condition-case nil
(let ((coding-system-for-read 'utf-8))
(with-temp-buffer
(insert-file-contents w-show--positions-file)
(goto-char (point-min))
(read (current-buffer))))
(error (message "Could not sync Wombag positions, starting over.")
(make-hash-table :size 1024)))
(make-hash-table :size 1024)))
(defun w-show--positions-save ()
(when-let ((id (alist-get 'id w-show-entry)))
(if (or (bobp) (eobp))
(remhash id w-show--positions-table)
(puthash id (point) w-show--positions-table))))
(defun w-show--positions-write ()
(when (and (boundp 'w-show--positions-table)
(hash-table-p w-show--positions-table)
(not (hash-table-empty-p w-show--positions-table)))
(let ((write-region-inhibit-fsync t)
(coding-system-for-write 'utf-8)
(print-level nil)
(print-length nil))
(with-temp-file w-show--positions-file
(insert ";;; -*- lisp-data -*-\n"
(prin1-to-string w-show--positions-table))))))
(add-hook 'kill-emacs-hook #'w-show--positions-write)
;;; Rendering the entry buffer
(defun w-show-render-html (begin end)
"Render HTML in current buffer with shr.
Render from positions BEGIN to END."
(run-hooks 'w-pre-html-render-hook)
(shr-render-region begin end)
(run-hooks 'w-post-html-render-hook))
(defun w-show-entry (entry)
"Read Wombag ENTRY at point."
(let ((buf (get-buffer-create w-show-buffer-name))
(title (alist-get 'title entry "(UNTITLED)"))
(reading-time (alist-get 'reading_time entry))
(created-at (alist-get 'created_at entry))
;; (tag (alist-get 'tag entry))
(domain-name (or (alist-get 'domain_name entry) ""))
(id (alist-get 'id entry))
(url (alist-get 'url entry))
(beg) (end))
(with-current-buffer buf
(delay-mode-hooks
(w-show-mode)
(funcall w-show-entry-switch buf)
(let ((inhibit-read-only t))
(erase-buffer)
(insert (propertize title 'face 'w-show-title-face)
"\n")
(insert (format "%s %s %s\n\n\n"
(propertize (format "%d min" reading-time)
'face 'w-reading-time-face)
(propertize (substring created-at 0 10)
'face 'w-date-face)
;; No DATA or HELP-ECHO args, the latter is not supported on Emacs 28.2
(propertize (button-buttonize
domain-name (lambda (_) (browse-url url)))
'face 'w-domain-face)))
(if-let ((content (car
(car-safe
(w-db-query `[:select content :from items :where (= id ,id)])))))
(progn (setq beg (point))
(insert content)
(setq end (point))
(w-show-render-html beg end))
(insert (propertize "(empty)" 'face 'warning)))
(if-let ((pos (gethash id w-show--positions-table)))
(prog1 (goto-char pos)
;; (recenter next-screen-context-lines)
(recenter)
)
(goto-char (point-min)))))
(setq w-show-entry entry)
(run-mode-hooks)
(current-buffer))))
;;; Actions in the entry buffer
(defun w-show-quit-window ()
"Close this Wombag article."
(interactive)
(quit-window 'kill)
(when-let* ((buf (w-search-buffer))
(win (get-buffer-window buf)))
(if (window-live-p win)
(select-window win))))
(defun w-show-disable-images ()
"Disable images in this Wombag buffer."
(interactive)
(when-let ((entry w-show-entry)
(shr-inhibit-images t))
(w-show-entry entry)))
;;; Major mode
(defvar-keymap w-show-mode-map
:doc "Keymap for `wombag-show-mode'."
"TAB" #'shr-next-link
"<backtab>" #'shr-previous-link
"SPC" #'scroll-up-command
"S-SPC" #'scroll-down-command
"DEL" #'scroll-down-command
"<" #'beginning-of-buffer
">" #'end-of-buffer
"q" #'w-show-quit-window
"I" #'w-show-disable-images
"C-c C-n" #'w-heading-next
"C-c C-p" #'w-heading-previous)
(define-derived-mode w-show-mode fundamental-mode
"wombag-entry"
"Mode for displaying wombag entry details.
\\{wombag-show-mode-map}"
(setq buffer-read-only t)
(buffer-disable-undo)
(setq-local bookmark-make-record-function
#'w-show-bookmark-make-record)
(w-heading-setup-imenu)
(add-hook 'kill-buffer-hook
#'w-show--positions-save nil 'local))
(provide 'wombag-show)
;;; wombag-show.el ends here
;; Local Variables:
;; read-symbol-shorthands: (("w-" . "wombag-"))
;; End: