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bc511a64f6
Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
167 lines
6.4 KiB
EmacsLisp
167 lines
6.4 KiB
EmacsLisp
;;; scroll-tests.el -- tests for scrolling -*- lexical-binding: t -*-
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;; Copyright (C) 2017 Free Software Foundation, Inc.
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;; This file is part of GNU Emacs.
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; These are mostly automated ert tests, but they don't work in batch
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;; mode which is why they are under test/manual.
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;;; Code:
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(require 'ert)
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(eval-when-compile (require 'cl-lib))
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(defun scroll-tests-up-and-down (margin &optional effective-margin)
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(unless effective-margin
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(setq effective-margin margin))
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(erase-buffer)
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(insert (mapconcat #'number-to-string
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(number-sequence 1 200) "\n"))
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(goto-char 1)
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(sit-for 0)
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(let ((scroll-margin margin)
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(wstart (window-start)))
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;; Stopping before `scroll-margin' so we shouldn't have
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;; scrolled.
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(let ((current-prefix-arg (- (window-text-height) 1 effective-margin)))
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(call-interactively 'next-line))
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(sit-for 0)
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(should (= wstart (window-start)))
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;; Passing `scroll-margin' should trigger scrolling.
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(call-interactively 'next-line)
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(sit-for 0)
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(should (/= wstart (window-start)))
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;; Scroll back to top.
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(let ((current-prefix-arg (window-start)))
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(call-interactively 'scroll-down-command))
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(sit-for 0)
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(should (= 1 (window-start)))))
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(defun scroll-tests-display-buffer-with-height (buffer alist)
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(let ((height (alist-get 'window-height alist)))
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(when height
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(let* ((window (or (get-buffer-window buffer) (selected-window)))
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(lines (floor height))
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(partial (round (* (- height lines) (default-line-height)))))
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(setq window (cond ((window-in-direction 'above window nil +1))
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((or (window-in-direction 'below window nil -1)
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(split-window-below lines))
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window)))
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(set-window-buffer window buffer)
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(set-window-text-height window lines)
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(adjust-window-trailing-edge window partial nil t)
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window))))
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(defmacro scroll-tests-with-buffer-window (&optional height &rest body)
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(declare (debug t) (indent defun))
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`(with-temp-buffer
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(with-selected-window (display-buffer (current-buffer)
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'(scroll-tests-display-buffer-with-height
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. ,(if (numberp height)
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`((window-height . ,height))
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(push height body)
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nil)))
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,@body)))
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(ert-deftest scroll-tests-scroll-margin-0 ()
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(skip-unless (not noninteractive))
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(scroll-tests-with-buffer-window
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(scroll-tests-up-and-down 0)))
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(ert-deftest scroll-tests-scroll-margin-negative ()
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"A negative `scroll-margin' should be the same as 0."
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(skip-unless (not noninteractive))
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(scroll-tests-with-buffer-window
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(scroll-tests-up-and-down -10 0)))
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(ert-deftest scroll-tests-scroll-margin-max ()
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(skip-unless (not noninteractive))
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(scroll-tests-with-buffer-window
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(let ((max-margin (/ (window-text-height) 4)))
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(scroll-tests-up-and-down max-margin))))
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(ert-deftest scroll-tests-scroll-margin-over-max ()
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"A `scroll-margin' more than max should be the same as max."
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(skip-unless (not noninteractive))
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(scroll-tests-with-buffer-window 7
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(let ((max-margin (/ (window-text-height) 4)))
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(scroll-tests-up-and-down (+ max-margin 1) max-margin)
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(scroll-tests-up-and-down (+ max-margin 2) max-margin))))
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(ert-deftest scroll-tests-conservative-show-trailing-whitespace ()
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"Test for Bug#25792."
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;; Note: requires partial line to trigger problem.
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(scroll-tests-with-buffer-window 20.5
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(let ((show-trailing-whitespace t)
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(scroll-conservatively 101)
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(scroll-margin 5))
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(insert (mapconcat #'number-to-string
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(number-sequence 1 200) "\n"))
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(goto-char 1)
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(forward-line 15)
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(sit-for 0)
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(let ((window-line (count-lines (window-start) (window-point))))
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(dotimes (_ 10)
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(call-interactively 'next-line)
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(sit-for 0)
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(should (= window-line (count-lines (window-start)
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(window-point)))))))))
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(defun scroll-tests--point-in-middle-of-window-p ()
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(= (count-lines (window-start) (window-point))
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(/ (1- (floor (window-screen-lines))) 2)))
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(cl-defun scroll-tests--scroll-margin-whole-window (&key with-line-spacing)
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"Test `maximum-scroll-margin' at 0.5.
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With a high `scroll-margin', this should keep cursor in the
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middle of the window."
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(let ((maximum-scroll-margin 0.5)
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(scroll-margin 100))
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;; Choose an odd number of lines, so there is a middle line.
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(scroll-tests-with-buffer-window 7
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(setq-local line-spacing with-line-spacing)
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;; `set-window-text-height' doesn't count `line-spacing'.
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(when with-line-spacing
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(window-resize nil (* line-spacing 8) nil nil 'pixels))
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(erase-buffer)
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(insert (mapconcat #'number-to-string
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(number-sequence 1 200) "\n"))
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(goto-char 1)
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(sit-for 0)
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(call-interactively 'scroll-up-command)
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(sit-for 0)
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(should (scroll-tests--point-in-middle-of-window-p))
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(call-interactively 'scroll-up-command)
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(sit-for 0)
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(should (scroll-tests--point-in-middle-of-window-p))
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(call-interactively 'scroll-down-command)
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(sit-for 0)
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(should (scroll-tests--point-in-middle-of-window-p)))))
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(ert-deftest scroll-tests-scroll-margin-whole-window ()
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(skip-unless (not noninteractive))
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(scroll-tests--scroll-margin-whole-window))
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(ert-deftest scroll-tests-scroll-margin-whole-window-line-spacing ()
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;; `line-spacing' has no effect on tty displays.
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(skip-unless (display-graphic-p))
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(scroll-tests--scroll-margin-whole-window :with-line-spacing 3))
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;;; scroll-tests.el ends here
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