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;;; erc-scenarios-keep-place-indicator.el --- erc-keep-place-indicator-mode -*- lexical-binding: t -*-
;; Copyright (C) 2023-2025 Free Software Foundation, Inc.
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Code:
(require 'ert-x)
(eval-and-compile
(let ((load-path (cons (ert-resource-directory) load-path)))
(require 'erc-scenarios-common)))
(require 'erc-goodies)
;; This test shows that the indicator does not update when at least
;; one window remains. When the last window showing a buffer switches
;; away, the indicator is updated if it's earlier in the buffer.
(ert-deftest erc-scenarios-keep-place-indicator--follow ()
:tags `(:expensive-test
,@(and (getenv "ERC_TESTS_GRAPHICAL") '(:erc--graphical)))
(when (version< emacs-version "29") (ert-skip "Times out"))
;; XXX verify that this continues to be the case ^.
(should-not erc-scrolltobottom-all)
(should-not erc-scrolltobottom-mode)
(should-not erc-keep-place-mode)
(erc-scenarios-common-with-noninteractive-in-term
((erc-scenarios-common-dialog "keep-place")
(dumb-server (erc-d-run "localhost" t 'follow))
(port (process-contact dumb-server :service))
(erc-modules `( keep-place-indicator scrolltobottom fill-wrap
,@erc-modules))
(erc-keep-place-indicator-follow t)
(erc-scrolltobottom-all t)
(erc-server-flood-penalty 0.1)
(erc-autojoin-channels-alist '((foonet "#chan" "#spam")))
(expect (erc-d-t-make-expecter)))
(ert-info ("Connect")
(with-current-buffer (erc :server "127.0.0.1"
:port port
:full-name "tester"
:nick "tester"
:user "tester")
(funcall expect 10 "debug mode")))
(with-current-buffer (erc-d-t-wait-for 10 (get-buffer "#chan"))
(set-window-buffer nil (current-buffer))
(delete-other-windows)
(split-window-below)
(funcall expect 10 "<bob> tester, welcome!")
(recenter 0)
(other-window 1)
(funcall expect 10 "<alice> tester, welcome!")
(recenter 0)
(should (= 2 (length (window-list))))
(ert-info ("Last window to switch away has point earlier in buffer")
;; Lower window, with point later in buffer, switches away first.
(switch-to-buffer (erc-d-t-wait-for 10 (get-buffer "#spam"))) ; lower
(other-window 1)
(switch-to-buffer "#spam") ; upper
(erc-scenarios-common-say "one")
(funcall expect 10 "Ay, the heads")
;; Overlay has moved to upper window start.
(switch-to-buffer "#chan")
(redisplay) ; force overlay to update
(save-excursion
(goto-char (window-point))
(should (looking-back (rx "<bob> tester, welcome!")))
(should (= (pos-bol) (window-start)))
(erc-d-t-wait-for 20
(= (overlay-start erc--keep-place-indicator-overlay) (pos-bol))))
;; Lower window is still centered at start.
(other-window 1)
(switch-to-buffer "#chan")
(save-excursion
(goto-char (window-point))
(should (looking-back (rx "<alice> tester, welcome!")))
(should (= (pos-bol) (window-start)))))
(ert-info ("Last window to switch away has point later in buffer")
;; Lower window advances.
(funcall expect 10 "<bob> alice: Since you can cog")
(recenter 0)
(redisplay) ; force ^ to appear on first line
(other-window 1) ; upper still at indicator, switches first
(switch-to-buffer "#spam")
(other-window 1)
(switch-to-buffer "#spam") ; lower follows, speaks to sync
(erc-scenarios-common-say "two")
(funcall expect 10 "<bob> Cause they take")
(goto-char (point-max))
;; Upper switches back first, finds indicator gone.
(other-window 1)
(switch-to-buffer "#chan")
(save-excursion
(goto-char (window-point))
(should (looking-back (rx "<bob> tester, welcome!")))
(should (= (pos-bol) (window-start)))
(should (> (overlay-start erc--keep-place-indicator-overlay)
(pos-eol))))
;; Lower window follows, window-start preserved.
(other-window 1)
(switch-to-buffer "#chan")
(save-excursion
(goto-char (window-point))
(should (looking-back (rx "you can cog")))
(should (= (pos-bol) (window-start)))
(should (= (overlay-start erc--keep-place-indicator-overlay)
(pos-bol)))))
(ert-info ("description")
(erc-send-input-line "#spam" "three")
(save-excursion (erc-d-t-search-for 10 "Ready"))
(switch-to-buffer "#spam")
(should (< (point) erc-input-marker))))
(erc-keep-place-mode -1)
(erc-scrolltobottom-mode -1)))
;;; erc-scenarios-keep-place-indicator.el ends here
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