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+;;; bookstack.el --- Remote editing for the BookStack documentation platform -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2022-2023 Alex Smith
+;; Authors: Alex Smith
+;; URL: https://git.xeal.me/xeals/bookstack.el
+;; Created: Tue Oct 11 2022
+;; Keywrods: comm hypermedia wp
+;; Version: 0.1.0
+;; Package-Requires: ((emacs "28.1") markdown-mode)
+
+;; This file is not part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Provides an interface to BookStack [1], an open-source documentation
+;; and wiki platform.
+;;
+;; In this early iteration, basic editing of pages is supported.
+;;
+;; [1]: https://www.bookstackapp.com/
+
+;;; Code:
+
+;; Emacs 28.1 is required for string processing. These could be polyfilled if
+;; interest arises.
+(require 'markdown-mode)
+(require 'json)
+(require 'url-vars)
+
+(defgroup bookstack nil
+  "Utilities to work with a remote BookStack server."
+  :prefix "bookstack-"
+  :group 'hypermedia
+  :group 'wp
+  :link '(url-link :tag "Gitea" "https://git.xeal.me/xeals/bookstack.el")
+  :link '(emacs-commentary-link :tag "Commentary" "bookstack-mode"))
+
+(defvar bookstack-token nil
+  "BookStack API authentication token.")
+
+(defvar bookstack-server nil
+  "BookStack server address, including protocol and port (if non-default).")
+
+(defvar-local bookstack--buffer-page-id nil
+  "ID of the page being edited in the current buffer.")
+
+(defun bookstack--retrieve (endpoint callback)
+  "Retrieves the ENDPOINT from the current `bookstack-server' asynchronously,
+executing CALLBACK with the decoded result."
+  (unless bookstack-token
+    (user-error "%s" "`bookstack-token' must be defined"))
+  (unless bookstack-server
+    (user-error "%s" "`bookstack-server' must be defined"))
+  (let ((url-request-extra-headers
+         `(("Authorization" . ,(format "Token %s" bookstack-token))
+           ("Content-Type" . "application/json")))
+        (cb
+         (lambda (status)
+           (pcase status
+             (`(:error (,type . ,data)) (user-error "BookStack %s error: %s" type data))
+             (_ (let* ((raw (car (last (string-lines (buffer-string)))))
+                       (json (json-read-from-string raw)))
+                  (apply callback (list json))))))))
+    (url-retrieve (concat bookstack-server "/api/" endpoint) cb)))
+
+(defun bookstack--write-page (id content)
+  "Writes CONTENT to the remote page with ID."
+  (let ((url-request-method "PUT")
+        (url-request-data (encode-coding-string
+                           (json-encode `((markdown . ,content)))
+                           'utf-8)))
+    (bookstack--retrieve (format "pages/%d" id) (lambda (_)))))
+
+(defun bookstack--read-page (pages)
+  "Reads a page from the user with `completing-read', returning its ID.
+PAGES should be a sequence of pages (as returned by `bookstack-pages')."
+  (let* ((opts (seq-reduce
+                (lambda (acc page)
+                  (push `(,(alist-get 'name page) . ,(alist-get 'id page)) acc))
+                pages
+                nil))
+         (page-name (progn
+                      (switch-to-minibuffer)
+                      (completing-read "Page: " opts))))
+    (cdr (assoc page-name opts))))
+
+(defun bookstack--edit-page (id)
+  "Asynchronously loads a page by ID for editing into a new buffer."
+  (bookstack-page
+   id
+   (lambda (page)
+     (or page (error "Missing full page '%d'" id))
+     (let-alist page
+       (let ((buffer (get-buffer-create (format "%s.md" .name)))
+             ;; fix line endings
+             (content (string-replace "
" "" .markdown)))
+         (with-current-buffer buffer
+           (markdown-mode)
+           (setq bookstack--buffer-page-id id)
+           (insert content)
+           (goto-char (point-min)))
+         (switch-to-buffer buffer)
+         (bookstack-mode +1))))))
+
+(defun bookstack-pages (callback)
+  "Retrieve all pages from `bookstack-server'."
+  (bookstack--retrieve
+   "pages"
+   (lambda (res) (apply callback (list (alist-get 'data res))))))
+
+(defun bookstack-page (id callback)
+  "Retrieve a single page from `bookstack-server'."
+  (bookstack--retrieve
+   (format "pages/%d" id)
+   (lambda (res) (apply callback (list res)))))
+
+(defun bookstack-save-buffer ()
+  "Pushes the current buffer to the BookStack server."
+  (interactive)
+  (let ((slug (string-replace " " "-" (downcase (file-name-base (buffer-name))))))
+    (bookstack--write-page bookstack--buffer-page-id (buffer-string))
+    (message "Wrote %s/.../page/%s" bookstack-server slug)))
+
+(define-minor-mode bookstack-mode
+  "Minor mode for editing remote BookStack buffers."
+  :init-value nil
+  :lighter " BookStack"
+  :keymap (let ((map (make-sparse-keymap)))
+            (define-key map [remap save-buffer] #'bookstack-save-buffer)
+            map))
+
+;;;###autoload
+(defun bookstack-find-page ()
+  "Prompts the user to find and edit a BookStack page."
+  (interactive)
+  (bookstack-pages
+   (lambda (pages)
+     (bookstack--edit-page (bookstack--read-page pages)))))
+
+(provide 'bookstack)
+
+;;; bookstack.el ends here