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+;;; gnosis-org.el --- Org module for Gnosis  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2023-2024  Thanos Apollo
+
+;; Author: Thanos Apollo <[email protected]>
+;; Keywords: extensions
+;; URL: https://git.thanosapollo.org/gnosis
+;; Version: 0.0.1
+
+;; Package-Requires: ((emacs "27.2") (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 'org)
+(require 'org-element)
+
+(defun gnosis-org--global-props (name &optional buffer)
+  "Get the plists of global org properties by NAME in BUFFER.
+
+NAME is a string representing the property name to search for.
+BUFFER defaults to the current buffer if not specified."
+  (cl-assert (stringp name) nil "NAME must be a string.")
+  (with-current-buffer (or buffer (current-buffer))
+    (let ((elements (org-element-map (org-element-parse-buffer) 'keyword
+                      (lambda (el)
+                        (when (string= (org-element-property :key el) name)
+                          el))
+                      nil t)))
+      (if elements elements
+        (message "No properties found for %s" name)
+        nil))))
+
+(defun gnosis-org--heading-props (property &optional buffer)
+  "Get the values of a custom PROPERTY from all headings in BUFFER.
+
+PROPERTY is a string representing the property name to search for.
+BUFFER defaults to the current buffer if not specified."
+  (cl-assert (stringp property) nil "PROPERTY must be a string.")
+  (with-current-buffer (or buffer (current-buffer))
+    (let ((results nil))
+      (org-element-map (org-element-parse-buffer) 'headline
+        (lambda (headline)
+          (let ((prop (org-element-property (intern (concat ":" property)) headline)))
+            (when prop
+              (push prop results)))))
+      (if results (reverse results)
+        (message "No custom properties found for %s" property)
+        nil))))
+
+(cl-defun gnosis-org-insert-custom-heading (&key main id body type (buffer (current-buffer)))
+  "Insert an Org heading in BUFFER.
+
+- MAIN as the title.
+- ID as CUSTOM_ID.
+- BODY as the content.
+- TYPE as the note type.
+
+If BUFFER is not specified, defaults to the current buffer."
+  (cl-assert (stringp main) nil "MAIN must be a string representing the heading title.")
+  (cl-assert (stringp id) nil "ID must be a string representing the CUSTOM_ID.")
+  (cl-assert (stringp body) nil "BODY must be a string representing the content.")
+  (cl-assert (stringp type) nil "TYPE must be a string representing the TYPE property.")
+  (with-current-buffer buffer
+    (goto-char (point-max)) ;; Ensure we're at the end of the buffer
+    (insert (format "* %s\n:PROPERTIES:\n:CUSTOM_ID: %s\n:TYPE: %s\n:END:\n%s\n" main id type body))
+    (message "Inserted heading: %s with CUSTOM_ID %s and TYPE %s" main id type)))
+
+(provide 'gnosis-org)
+;;; gnosis-org.el ends here.