From: "Simen Heggestøyl" <simenheg@gmail.com>
To: Stefan Kangas <stefan@marxist.se>
Cc: 36009@debbugs.gnu.org, Paul Eggert <eggert@cs.ucla.edu>
Subject: bug#36009: [PATCH] Use lexical-binding in textmodes/page.el and add tests
Date: Sat, 22 Jun 2019 12:55:17 +0200 [thread overview]
Message-ID: <1561200917.30499.0@smtp.gmail.com> (raw)
In-Reply-To: <CADwFkmm4oVUJ6C1VX9ruz5Fd0LufOUwhHDm40YFsc3Lbc5R0AA@mail.gmail.com>
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How about something along these lines?
-- Simen
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From aaa78cb17dbfcfa8e7301d3e6734c5157a6da4ab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Simen=20Heggest=C3=B8yl?= <simenheg@gmail.com>
Date: Sat, 22 Jun 2019 12:49:04 +0200
Subject: [PATCH] Split up and add tests for two page.el functions
* lisp/textmodes/page.el (page--count-lines-page): New function
extracted from `count-lines-page'.
(count-lines-page): Extract main logic into `page--count-lines-page'.
(page--what-page); New function extracted from `what-page'.
(what-page): Extract main logic into `page--what-page'.
* test/lisp/textmodes/page-tests.el (page-tests-count-lines-page)
(page-tests-what-page): New tests for `page--count-lines-page' and
`page--what-page'.
---
lisp/textmodes/page.el | 59 ++++++++++++++++++-------------
test/lisp/textmodes/page-tests.el | 19 +++++++++-
2 files changed, 52 insertions(+), 26 deletions(-)
diff --git a/lisp/textmodes/page.el b/lisp/textmodes/page.el
index 8921b697f3..a42fc6e053 100644
--- a/lisp/textmodes/page.el
+++ b/lisp/textmodes/page.el
@@ -125,41 +125,50 @@ narrow-to-page
(point)))))
(put 'narrow-to-page 'disabled t)
-(defun count-lines-page ()
- "Report number of lines on current page, and how many are before or after point."
- (interactive)
+(defun page--count-lines-page ()
+ "Return a list of line counts on the current page.
+The list is on the form (TOTAL BEFORE AFTER), where TOTAL is the
+total number of lines on the current page, while BEFORE and AFTER
+are the number of lines on the current page before and after
+point, respectively."
(save-excursion
- (let ((opoint (point)) beg end
- total before after)
+ (let ((opoint (point)))
(forward-page)
(beginning-of-line)
- (or (looking-at page-delimiter)
- (end-of-line))
- (setq end (point))
- (backward-page)
- (setq beg (point))
- (setq total (count-lines beg end)
- before (count-lines beg opoint)
- after (count-lines opoint end))
- (message (ngettext "Page has %d line (%d + %d)"
- "Page has %d lines (%d + %d)" total)
- total before after))))
+ (unless (looking-at page-delimiter)
+ (end-of-line))
+ (let ((end (point)))
+ (backward-page)
+ (list (count-lines (point) end)
+ (count-lines (point) opoint)
+ (count-lines opoint end))))))
-(defun what-page ()
- "Print page and line number of point."
+(defun count-lines-page ()
+ "Report number of lines on current page, and how many are before or after point."
(interactive)
+ (pcase-let ((`(,total ,before ,after) (page--count-lines-page)))
+ (message (ngettext "Page has %d line (%d + %d)"
+ "Page has %d lines (%d + %d)" total)
+ total before after)))
+
+(defun page--what-page ()
+ "Return a list of the page and line number of point."
(save-restriction
(widen)
(save-excursion
(let ((count 1)
- (opoint (point)))
- (goto-char (point-min))
- (while (re-search-forward page-delimiter opoint t)
- (if (= (match-beginning 0) (match-end 0))
- (forward-char 1))
- (setq count (1+ count)))
- (message "Page %d, line %d" count (line-number-at-pos opoint))))))
+ (opoint (point)))
+ (goto-char (point-min))
+ (while (re-search-forward page-delimiter opoint t)
+ (when (= (match-beginning 0) (match-end 0))
+ (forward-char))
+ (setq count (1+ count)))
+ (list count (line-number-at-pos opoint))))))
+(defun what-page ()
+ "Print page and line number of point."
+ (interactive)
+ (apply #'message (cons "Page %d, line %d" (page--what-page))))
\f
;;; Place `provide' at end of file.
diff --git a/test/lisp/textmodes/page-tests.el b/test/lisp/textmodes/page-tests.el
index 0834d65433..517f1d5a9e 100644
--- a/test/lisp/textmodes/page-tests.el
+++ b/test/lisp/textmodes/page-tests.el
@@ -82,5 +82,22 @@ page-tests-narrow-to-page
(narrow-to-page -1)
(should (equal (buffer-string) "bar\n"))))
-(provide 'page-tests)
+(ert-deftest page-tests-count-lines-page ()
+ (with-temp-buffer
+ (insert "foo\n\f\nbar\n\f\nbaz")
+ (goto-char (point-min))
+ (should (equal (page--count-lines-page) '(1 0 1)))
+ (goto-char (point-max))
+ (should (equal (page--count-lines-page) '(2 2 0)))))
+
+(ert-deftest page-tests-what-page ()
+ (with-temp-buffer
+ (insert "foo\n\f\nbar\n\f\nbaz")
+ (goto-char (point-min))
+ (should (equal (page--what-page) '(1 1)))
+ (forward-page)
+ (should (equal (page--what-page) '(2 2)))
+ (forward-page)
+ (should (equal (page--what-page) '(3 4)))))
+
;;; page-tests.el ends here
--
2.20.1
next prev parent reply other threads:[~2019-06-22 10:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-30 18:31 bug#36009: [PATCH] Use lexical-binding in textmodes/page.el and add tests Stefan Kangas
2019-06-02 1:58 ` Paul Eggert
2019-06-02 10:25 ` Simen Heggestøyl
2019-06-13 22:02 ` Stefan Kangas
2019-06-22 10:55 ` Simen Heggestøyl [this message]
2019-06-22 21:32 ` Stefan Kangas
2019-06-22 23:57 ` Paul Eggert
2019-06-23 5:29 ` Simen Heggestøyl
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