Jethro Kuan
6 years ago
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;;; org-roam-utils.el --- Roam Research replica with Org-mode -*- coding: utf-8; lexical-binding: t -*- |
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;; Copyright © 2020 Jethro Kuan <jethrokuan95@gmail.com> |
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;; Author: Jethro Kuan <jethrokuan95@gmail.com> |
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;; URL: https://github.com/jethrokuan/org-roam |
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;; Keywords: org-mode, roam, convenience |
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;; Version: 0.1.0 |
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;; Package-Requires: ((emacs "26.1")) |
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;; This file is NOT part of GNU Emacs. |
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;; This program is free software; you can redistribute it and/or modify |
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;; it under the terms of the GNU General Public License as published by |
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;; the Free Software Foundation; either version 3, or (at your option) |
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;; any later version. |
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;; |
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;; This program is distributed in the hope that it will be useful, |
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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;; GNU General Public License for more details. |
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;; |
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;; You should have received a copy of the GNU General Public License |
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;; along with GNU Emacs; see the file COPYING. If not, write to the |
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
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;; Boston, MA 02110-1301, USA. |
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;;; Commentary: |
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;; |
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;; This library is an attempt at injecting Roam functionality into Org-mode. |
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;; This is achieved primarily through building caches for forward links, |
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;; backward links, and file titles. |
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;; |
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;;; Code: |
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(require 'org) |
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(require 'org-element) |
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(require 'subr-x) |
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(require 'cl-lib) |
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(defun org-roam--find-files (dir) |
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"Return all `org-roam' files in `DIR'." |
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(if (file-exists-p dir) |
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(let ((files (directory-files dir t "." t)) |
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(dir-ignore-regexp (concat "\\(?:" |
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"\\." |
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"\\|\\.\\." |
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"\\)$")) |
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result) |
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(dolist (file files) |
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(cond |
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((file-directory-p file) |
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(when (not (string-match dir-ignore-regexp file)) |
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(setq result (append (org-roam--find-files file) result)))) |
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((and (file-readable-p file) |
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(string= (file-name-extension file) "org")) |
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(setq result (cons (file-truename file) result))))) |
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result))) |
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(defun org-roam--parse-content (&optional file-path) |
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"Parse the current buffer, and return a list of items for processing." |
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(org-element-map (org-element-parse-buffer) 'link |
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(lambda (link) |
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(let ((type (org-element-property :type link)) |
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(path (org-element-property :path link)) |
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(start (org-element-property :begin link))) |
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(when (and (string= type "file") |
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(string= (file-name-extension path) "org")) |
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(goto-char start) |
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(let* ((element (org-element-at-point)) |
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(content (or (org-element-property :raw-value element) |
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(buffer-substring |
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(or (org-element-property :content-begin element) |
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(org-element-property :begin element)) |
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(or (org-element-property :content-end element) |
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(org-element-property :end element)))))) |
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(list :from (or file-path |
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(file-truename (buffer-file-name (current-buffer)))) |
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:to (file-truename (expand-file-name path org-roam-directory)) |
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:content (string-trim content)))))))) |
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(cl-defun org-roam--insert-item (item &key forward backward) |
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"Insert ITEM into FORWARD and BACKWARD cache. |
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ITEM is of the form: (:from from-path :to to-path :content preview-content)." |
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(pcase-let ((`(:from ,p-from :to ,p-to :content ,content) item)) |
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;; Build forward-links |
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(let ((links (gethash p-from forward))) |
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(if links |
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(puthash p-from |
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(if (member p-to links) |
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links |
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(cons p-to links)) forward) |
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(puthash p-from (list p-to) forward))) |
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;; Build backward-links |
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(let ((contents-hash (gethash p-to backward))) |
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(if contents-hash |
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(if-let ((contents-list (gethash p-from contents-hash))) |
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(let ((updated (cons content contents-list))) |
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(puthash p-from updated contents-hash) |
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(puthash p-to contents-hash backward)) |
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(progn |
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(puthash p-from (list content) contents-hash) |
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(puthash p-to contents-hash backward))) |
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(let ((contents-hash (make-hash-table :test #'equal))) |
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(puthash p-from (list content) contents-hash) |
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(puthash p-to contents-hash backward)))))) |
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(defun org-roam--extract-title () |
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"Extract the title from `BUFFER'." |
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(org-element-map |
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(org-element-parse-buffer) |
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'keyword |
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(lambda (kw) |
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(when (string= (org-element-property :key kw) "TITLE") |
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(org-element-property :value kw))) |
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:first-match t)) |
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(provide 'org-roam-utils) |
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;;; org-roam-utils.el ends here |
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