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+;;; jao-notmuch-tree-fold.el --- Show/hide (sub)tress in notmuch-tree  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021  jao
+
+;; Author: jao <mail@jao.io>
+;; Keywords: mail
+
+;; 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:
+
+;;
+
+;;; Code:
+
+(require 'jao-notmuch)
+
+
+;; Show/hide threads
+
+(defun jao-notmuch--tree-top () (notmuch-tree-get-prop :first))
+
+(defun jao-notmuch--tree-bottom ()
+  (let ((line-move-ignore-invisible t))
+    (save-excursion
+      (when (zerop (forward-line 1))
+        (or (not (notmuch-tree-get-message-properties))
+            (jao-notmuch--tree-top))))))
+
+(defun jao-notmuch-tree-hide-thread ()
+  (interactive)
+  (notmuch-tree-thread-top)
+  (save-excursion
+    (forward-line 1)
+    (when (not (jao-notmuch--tree-top))
+      (let ((line-move-ignore-invisible nil)
+            (inhibit-read-only t)
+            (p (point)))
+        (unless (notmuch-tree-next-thread-in-tree)
+          (forward-line -1))
+        (add-text-properties p (point) '(invisible t))))))
+
+(defun jao-notmuch-tree-show-thread ()
+  (interactive)
+  (when (or (jao-notmuch--tree-top) (invisible-p (point)))
+    (let ((line-move-ignore-invisible nil))
+      (notmuch-tree-thread-top)
+      (let ((inhibit-read-only t)
+            (p (point)))
+        (notmuch-tree-next-thread-in-tree)
+        (remove-text-properties p (point) '(invisible nil))
+        (goto-char p)))))
+
+(defun jao-notmuch-tree-show-all ()
+  (interactive)
+  (let ((inhibit-read-only t))
+    (put-text-property (point-min) (point-max) 'invisible nil)))
+
+(defun jao-notmuch-tree-hide-all ()
+  (interactive)
+  (let ((inhibit-read-only t)
+        (line-move-ignore-invisible nil))
+      (goto-char (point-min))
+      (jao-notmuch-tree-hide-thread)
+      (while (notmuch-tree-next-thread-in-tree)
+        (jao-notmuch-tree-hide-thread)))
+  (goto-char (point-min)))
+
+(defun jao-notmuch-tree-toggle-thread ()
+  (interactive)
+  (let ((line-move-ignore-invisible nil))
+    (forward-line 1)
+    (when (jao-notmuch--tree-top)
+      (forward-line -1))
+    (if (invisible-p (point))
+        (jao-notmuch-tree-show-thread)
+      (jao-notmuch-tree-hide-thread))))
+
+(defvar notmuch-tree-thread-map
+  (let ((m (make-keymap "Thread operations")))
+    (define-key m (kbd "TAB") #'jao-notmuch-tree-toggle-thread)
+    (define-key m (kbd "t") #'jao-notmuch-tree-toggle-thread)
+    (define-key m (kbd "s") #'jao-notmuch-tree-show-thread)
+    (define-key m (kbd "S") #'jao-notmuch-tree-show-all)
+    (define-key m (kbd "h") #'jao-notmuch-tree-hide-thread)
+    (define-key m (kbd "H") #'jao-notmuch-tree-hide-all)
+    m))
+
+(defun jao-notmuch--tree-next (prev thread no-exit)
+  (let ((line-move-ignore-invisible t))
+    (cond ((looking-at-p "^End of search results")
+           (unless no-exit
+             (notmuch-tree-close-message-window)
+             (notmuch-tree-quit)))
+          ((jao-notmuch--looking-at-new-p)
+           (save-excursion (jao-notmuch-tree-show-thread))
+           (notmuch-tree-show-message nil))
+          (thread
+           (save-excursion (jao-notmuch-tree-hide-thread))
+           (when (notmuch-tree-next-thread prev)
+             (save-excursion (jao-notmuch-tree-show-thread)))
+           (unless (jao-notmuch--looking-at-new-p)
+             (notmuch-tree-matching-message prev (not no-exit))))
+          ((or (and (not prev) (jao-notmuch--tree-bottom))
+               (and prev (jao-notmuch--tree-top)))
+           (save-excursion (jao-notmuch-tree-hide-thread))
+           (forward-line (if prev -1 1))
+           (jao-notmuch--tree-next prev nil no-exit))
+          ((notmuch-tree-get-message-id)
+           (save-excursion (jao-notmuch-tree-show-thread))
+           (notmuch-tree-matching-message prev (not no-exit)))))
+  (when (notmuch-tree-get-message-id)
+    (notmuch-tree-show-message nil))
+  (jao-notmuch--tree-update-buffer-name))
+
+(defun jao-notmuch-tree-next (thread &optional no-exit)
+  "Next message or thread in forest, taking care of thread visibility."
+  (interactive "P")
+  (jao-notmuch--tree-next nil thread no-exit))
+
+(defun jao-notmuch-tree-previous (thread)
+  "Previous message or thread in forest, taking care of thread visibility.."
+  (interactive "P")
+  (jao-notmuch--tree-next t thread t))
+
+
+(provide 'jao-notmuch-tree-fold)
+;;; jao-notmuch-tree-fold.el ends here