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;;; org-roam-ui.el --- User Interface for Org-roam -*- coding: utf-8; lexical-binding: t; -*-
;; Copyright © 2021 ...
;; Author: ...
;; URL: https://github.com/org-roam/org-roam-ui
;; Keywords: org-mode, roam
;; Version: ...
;; Package-Requires: ((emacs "26.1") (f "0.17.2") (org-roam "2.0.0"))
;; This file is NOT part of GNU Emacs.
;; 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, 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 GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;
;; Org-roam-ui provides a web interface for navigating around notes created
;; within Org-roam.
;;
;;; Code:
;;;; Dependencies
(require 'f)
(require 'json)
(require 'simple-httpd)
(require 'org-roam)
(defgroup org-roam-ui nil
"UI in Org-roam."
:group 'org-roam
:prefix "org-roam-ui-"
:link '(url-link :tag "Github" "https://github.com/org-roam/org-roam-ui"))
(defvar org-roam-ui/root-dir default-directory
"Root directory of the org-roam-ui project.")
(defvar org-roam-ui/app-build-dir (expand-file-name "./out/")
"Directory containing org-roam-ui's web build.")
;;; Dynamic variables
(defvar org-roam-ui-current-node-id nil
"The current node id Org-roam is tracking.")
;; TODO: make into defcustom
(defvar org-roam-ui-port
35901
"Port to serve the org-roam-ui interface.")
(defcustom org-roam-ui-link-child-notes t
"TODO"
:group 'org-roam-ui
:type 'boolean)
(define-minor-mode
org-roam-ui-mode
"Enable org-roam-ui.
This serves the web-build and API over HTTP."
:lighter "org-roam-ui "
:global t
:group 'org-roam-ui
:init-value nil
(cond
(org-roam-ui-mode
(setq httpd-port org-roam-ui-port
httpd-root org-roam-ui/app-build-dir)
(httpd-start)
(add-hook 'post-command-hook #'org-roam-ui-update))
(t
(remove-hook 'post-command-hook #'org-roam-ui-update)
(httpd-stop))))
(defservlet* graph application/json ()
(let* ((nodes-columns [id file title level])
(links-columns [source dest type])
(nodes-db-rows (org-roam-db-query `[:select ,nodes-columns :from nodes]))
(links-db-rows (org-roam-db-query `[:select ,links-columns :from links :where (or (= type "id") (= type "cite"))]))
(links-total (append links-db-rows (when org-roam-ui-link-child-notes (org-roam-ui-link-children-parents))))
(response (json-encode `((nodes . ,(mapcar (apply-partially #'org-roam-ui-sql-to-alist (append nodes-columns nil)) nodes-db-rows))
(links . ,(mapcar (apply-partially #'org-roam-ui-sql-to-alist '(source target type)) links-total))))))
(insert response)
(httpd-send-header t "application/json" 200 :Access-Control-Allow-Origin "*")))
(defun org-roam-ui-sql-to-alist (column-names rows)
"Convert sql result to alist for json encoding.
ROWS is the sql result, while COLUMN-NAMES is the columns to use."
(let (res)
(while rows
(push (cons (pop column-names) (pop rows)) res))
res))
(defun org-roam-ui-link-children-parents ()
"Return list of links from child notes to their parent file node."
(let* ((parents (org-roam-db-query `[:select [file id] :from nodes :where (= level 0)]))
(row))
(dolist (dad parents)
(if-let
((children
(org-roam-db-query `[:select [id] :from nodes :where (and (> level 0) (= file ,(car dad)))])))
(dolist (child children) (push (list (car child) (elt dad 1) "parent") row))))
row)
)
(defservlet* theme text/stream ()
(progn
(when (boundp 'doom-themes--colors)
(let*
((colors (butlast doom-themes--colors (- (length doom-themes--colors) 25))) ui-theme (list nil))
(progn
(dolist (color colors) (push (cons (car color) (car (cdr color))) ui-theme))
(insert (format "data: %s\n\n" (json-encode ui-theme))))))
(httpd-send-header t "text/event-stream" 200 :Access-Control-Allow-Origin "*")))
(defservlet* id/:id text/html ()
(let ((node (org-roam-populate (org-roam-node-create :id id)))
html-string)
(org-roam-with-temp-buffer (org-roam-node-file node)
(setq-local org-export-with-toc nil)
(setq-local org-export-with-broken-links t)
(setq-local org-export-with-sub-superscripts nil)
(setq html-string (org-export-as 'html)))
(insert html-string)))
(defservlet* current-node-id text/event-stream ()
(insert (format "data: %s\n\n"
org-roam-ui-current-node-id))
(httpd-send-header t "text/event-stream" 200 :Access-Control-Allow-Origin "*"))
(defun org-roam-ui-update ()
"Track changes within Emacs to update Org-roam UI.
This function is added to `post-command-hook'."
(setq org-roam-ui-current-node-id
(or
(condition-case nil (org-roam-id-at-point) (error nil))
org-roam-ui-current-node-id)))
(provide 'org-roam-ui)
;;; org-roam-ui.el ends here
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