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;;; jao-org-focus.el --- focusing on org subtrees -*- lexical-binding: t; -*-
;; Copyright (C) 2025 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <mail@jao.io>
;; Keywords: docs
;; 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:
;; Miscellanous utilities for working with org files
(require 'org)
;;; focus on subtree
(defvar-local jao-org-focus--parent nil)
(defun jao-org-focus ()
"Pop creatingly to an indirect buffer focused on the encloing subtree.
When invoked on an indirect buffer, pops back to its base."
(interactive)
(if-let* ((b (get-buffer (or jao-org-focus--parent ""))))
(pop-to-buffer b)
(when-let* ((elem (org-element-at-point))
(header (if (eq 'headline (org-element-type elem))
elem
(org-previous-visible-heading 1)
(org-element-at-point)))
(title (org-element-property :title header))
(parent (buffer-name))
(bname (format "%s [%s]" title parent)))
(if-let* ((b (get-buffer bname)))
(pop-to-buffer b)
(clone-indirect-buffer bname t)
(setq jao-org-focus--parent parent)
(org-narrow-to-subtree)))))
(defun jao-org-focus-list (&optional any-parent)
"List of buffers that are focusing on a subtree of this one or its parent."
(let ((n (or jao-org-focus--parent (buffer-name))))
(seq-filter (lambda (b)
(let ((p (buffer-local-value 'jao-org-focus--parent b)))
(and p (or any-parent (string= n p)))))
(buffer-list))))
(defvar jao-org-focus--focused-history nil)
(defun jao-org-focus-switch (arg)
"Read with completion a focused child and pop to it.
With arg, offer to switch to all children, regardless of their parent."
(interactive "P")
(let ((fl (mapcar 'buffer-name (jao-org-focus-list arg))))
(unless fl (error "No focused children"))
(pop-to-buffer
(completing-read "Focused child: " fl
nil t nil 'jao-org-focus--focused-history))))
(defvar jao-org-focus-consult-buffer-source
`(:name "Focus buffers"
:category jao-org-focus-buffers
:action switch-to-buffer
:hidden t
:narrow ,(cons ?o "focus")
:history jao-org-focus--focused-history
:items ,(lambda () (mapcar 'buffer-name (jao-org-focus-list t)))))
(provide 'jao-org-focus)
;;; jao-org.el ends here
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