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;;; org-gnosis.el --- Org Zettelkasten Note Management System -*- lexical-binding: t; -*-
;; Copyright (C) 2024-2025 Thanos Apollo
;; Author: Thanos Apollo <[email protected]>
;; Keywords: extensions
;; URL: https://thanosapollo.org/projects/gnosis
;; Version: 0.0.1
;; Package-Requires: ((emacs "27.2") (emacsql "4.0.3") (compat "29.1.4.2"))
;; 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:
;; Under development
;;; Code:
(require 'cl-lib)
(require 'emacsql-sqlite)
(require 'org-element)
(defvar org-gnosis-db (emacsql-sqlite-open (locate-user-emacs-file "org-gnosis.db")))
(cl-defun org-gnosis-select (value table &optional (restrictions '1=1) (flatten nil))
"Select VALUE from TABLE, optionally with RESTRICTIONS.
Optional argument FLATTEN, when non-nil, flattens the result."
(let ((output (emacsql org-gnosis-db `[:select ,value :from ,table :where ,restrictions])))
(if flatten
(apply #'append output)
output)))
(cl-defun org-gnosis--insert-into (table values)
"Insert VALUES to TABLE."
(emacsql org-gnosis-db `[:insert :into ,table :values ,values]))
(defun org-gnosis-get-current-node-title ()
"Return the title of the current node."
(when (derived-mode-p 'org-mode)
(let* ((parsed-data (org-element-parse-buffer))
(title (org-element-map parsed-data 'keyword
(lambda (kw)
(when (string-equal (org-element-property :key kw) "TITLE")
(org-element-property :value kw)))
nil t)))
title)))
(defun org-gnosis-get-filetags (&optional parsed-data)
"Return the filetags of the buffer's PARSED-DATA as a comma-separated string."
(let* ((parsed-data (or parsed-data (org-element-parse-buffer)))
(filetags (org-element-map parsed-data 'keyword
(lambda (kw)
(when (string-equal (org-element-property :key kw) "FILETAGS")
(org-element-property :value kw)))
nil t)))
(when filetags
(mapconcat 'identity (split-string filetags "[:\s]+" t) ","))))
(defun org-gnosis-process-node (node)
"Process a single headline NODE and return information as a list."
(let ((title (org-element-property :raw-value node))
(tags (org-element-property :tags node))
(id (org-element-property :ID node))
(children (org-element-contents node)))
(when title
(list title tags id
(org-gnosis-process-children children (1+ (org-element-property :level node)))))))
(defun org-gnosis-process-children (nodes level)
"Recursively process NODES at a given LEVEL."
(let (result)
(while nodes
(let ((current-node (car nodes))
(current-level (org-element-property :level (car nodes))))
(if (and current-level (= current-level level))
(progn
(push (org-gnosis-process-node current-node) result)
(setq nodes (cdr nodes)))
(setq nodes (cdr nodes)))))
(nreverse result)))
(defun org-gnosis-get-data--nodes (&optional parsed-data)
"Return a hierarchical list of nodes with titles, tags, and IDs from PARSED-DATA."
(let ((parsed-data (or parsed-data (org-element-parse-buffer))))
(org-gnosis-process-children (org-element-map parsed-data 'headline #'identity) 1)))
(defun org-gnosis-get-data--topic (&optional parsed-data)
"Retrieve the title and ID from the current org buffer or given PARSED-DATA."
(let* ((parsed-data (or parsed-data (org-element-parse-buffer)))
(title (org-element-map parsed-data 'keyword
(lambda (kw)
(when (string= (org-element-property :key kw) "TITLE")
(org-element-property :value kw)))
nil t))
(id (org-element-map parsed-data 'property-drawer
(lambda (drawer)
(org-element-map (org-element-contents drawer) 'node-property
(lambda (prop)
(when (string= (org-element-property :key prop) "ID")
(org-element-property :value prop)))
nil t))
nil t))
(tags (org-gnosis-get-filetags)))
(list title tags id)))
(defun org-gnosis-get--data (file)
"Return data for FILE.
FILE: File path"
(let* ((parsed-data (org-element-parse-buffer))
(topic (org-gnosis-get-data--topic parsed-data))
(nodes (org-gnosis-get-data--nodes parsed-data))
(filename (file-name-nondirectory file)))
`(:file ,filename :topic ,topic :nodes ,nodes)))
(defun org-gnosis-adjust-titles (input)
"Adjust the INPUT string to replace id link structures with plain text."
(replace-regexp-in-string "\\[\\[id:[^]]+\\]\\[\\(.*?\\)\\]\\]" "\\1" input))
(defun org-gnosis-get-file-info (filename)
"Something FILENAME."
(with-temp-buffer
(insert-file-contents filename)
(let* ((data (org-gnosis-get--data filename))
(filename (plist-get data :file)))
data)))
(defun org-gnosis-parse-nodes (nodes top-node inherited-tags)
"Parse a list of nodes, inheriting tags from the top node.
NODES: list of nodes to parse.
TOP-NODE: the name of the top node to associate with each node.
INHERITED-TAGS: tags from the top node to inherit."
(cl-loop for (name tags id sub-nodes) in nodes
;; Only include nodes with non-nil id
when id
append (list (list :category name
:tags (append tags inherited-tags)
:id id
:top-node top-node))
;; Recursively parse sub-nodes, inheriting current node's tags
append (org-gnosis-parse-nodes sub-nodes (when id name) (append tags inherited-tags))))
(defun org-gnosis-parse-data-recursive (data &optional initial-tags)
"Recursively parse the entire data structure, extracting nodes and details.
DATA: List of top-level categories to start parsing.
INITIAL-TAGS: Initial set of tags to inherit."
(cl-loop for (node tags id sub-nodes) in data
;; Directly parse sub-nodes, using top-level nodes only if they have valid id
append (when id (list (list :category node
:tags (append tags initial-tags)
:id id
:top-node nil)))
append (org-gnosis-parse-nodes sub-nodes node (append tags initial-tags))))
;; Org-Gnosis Database
(defconst org-gnosis-db-version 1)
(defconst org-gnosis-db--table-schemata
'((nodes
([(id :not-null :primary-key)
(file :not-null)
(title text)
tags]
(:foreign-key [file] :references files [file] :on-delete :cascade)))
(refs
([(node-id :not-null)
(ref :not-null)
(type :not-null)]
(:foreign-key [node-id] :references nodes [id] :on-delete :cascade)))
(links
([(source :not-null)
(dest :not-null)]
(:foreign-key [source] :references nodes [id] :on-delete :cascade)))))
(defconst org-gnosis-db--table-indices
'((refs-node-id refs [node-id])))
(defun org-gnosis-db-init ()
"Initialize database DB with the correct schema and user version."
(unless (length= (emacsql org-gnosis-db
[:select name :from sqlite-master :where (= type table)])
7)
(emacsql-with-transaction org-gnosis-db
(pcase-dolist (`(,table ,schema) org-gnosis-db--table-schemata)
(emacsql org-gnosis-db [:create-table $i1 $S2] table schema))
(pcase-dolist (`(,index-name ,table ,columns) org-gnosis-db--table-indices)
(emacsql org-gnosis-db [:create-index $i1 :on $i2 $S3] index-name table columns))
(emacsql org-gnosis-db [:pragma (= user-version org-gnosis-db-version)]))))
(provide 'org-gnosis)
;;; org-gnosis.el ends here
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