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bug#26049: 25.2; Extra lines not added to comment


From: Antonin Houska
Subject: bug#26049: 25.2; Extra lines not added to comment
Date: Fri, 10 Mar 2017 14:41:15 +0100

Even though I have the following customizations in place

 '(comment-multi-line t)
 '(comment-style (quote extra-line))

comment-region command produces this

/* some comment */

rather than this

/*
 * some comment
 */

Attached is a patch that I use to fix the issue on my workstation. Besides
fixing the (supposed) off-by-one error, the patch also removes trailing
whitespace from the initial line of the comment ("/* "). (My knowledge of
Elisp is not too advanced so I wonder if there's simpler way to trim
whitespace from a string.)




In GNU Emacs 25.2.3 (x86_64-suse-linux-gnu, X toolkit, Xaw scroll bars)
 of 2017-03-10 built on linux-j735
Repository revision: 6e788ef0e262fafc014c21f4ad52cc5dc9f1715b
Windowing system distributor 'The X.Org Foundation', version 11.0.11702000
System Description:     openSUSE Leap 42.1 (x86_64)

Configured using:
 'configure --prefix=/home/ah/emacs 'CC=ccache cc''

Configured features:
XPM JPEG TIFF GIF PNG SOUND NOTIFY GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS LUCID X11

Important settings:
  value of $EMACSLOADPATH: :/home/ah/repos/pgqa/lisp/pgqa
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=local
  locale-coding-system: utf-8-unix

Major mode: Messages

Minor modes in effect:
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  column-number-mode: t
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  global-visual-line-mode: t
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Recent messages:
Loading delsel...done
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
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/home/ah/emacs/share/emacs/25.2/lisp/progmodes/ada-prj hides 
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/home/ah/repos/elpa/packages/crisp/crisp
/home/ah/emacs/share/emacs/25.2/lisp/obsolete/landmark hides 
/home/ah/repos/elpa/packages/landmark/landmark
/home/ah/emacs/share/emacs/25.2/lisp/net/pinentry hides 
/home/ah/repos/elpa/packages/pinentry/pinentry
/home/ah/emacs/share/emacs/25.2/lisp/emacs-lisp/seq hides 
/home/ah/repos/elpa/packages/seq/seq
/home/ah/repos/elpa/packages/all/all hides 
/home/ah/repos/elpa/packages/company/test/all
/home/ah/emacs/share/emacs/25.2/lisp/indent hides 
/home/ah/repos/elpa/packages/js2-mode/tests/indent
/home/ah/repos/elpa/packages/load-relative/test/install-pkgs hides 
/home/ah/repos/elpa/packages/loc-changes/test/install-pkgs
/home/ah/repos/elpa/packages/loc-changes/test/test-basic hides 
/home/ah/repos/elpa/packages/test-simple/test/test-basic

Features:
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help-mode easymenu cconv cl-loaddefs pcase cl-lib time-date mule-util
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Memory information:
((conses 16 132187 8058)
 (symbols 48 24578 0)
 (miscs 40 57 129)
 (strings 32 28089 5577)
 (string-bytes 1 861163)
 (vectors 16 18787)
 (vector-slots 8 538382 3672)
 (floats 8 272 74)
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 (buffers 976 20)
 (heap 1024 37606 923))
-- 
Antonin Houska
Cybertec Schönig & Schönig GmbH
Gröhrmühlgasse 26
A-2700 Wiener Neustadt
Web: http://www.postgresql-support.de, http://www.cybertec.at

diff --git a/lisp/newcomment.el b/lisp/newcomment.el
new file mode 100644
index 1af8929..75dbb07
*** a/lisp/newcomment.el
--- b/lisp/newcomment.el
*************** the region rather than at left margin."
*** 1139,1144 ****
--- 1139,1149 ----
  
          ;; make the leading and trailing lines if requested
          (when lines
+           ;; Trim trailing whitespace from cs if there's some.
+           (let ((wp-pos (string-match "\\s-+$" cs)))
+             (if wp-pos
+                 (setq cs (substring cs 0 wp-pos))))
+ 
            (let ((csce
                   (comment-make-extra-lines
                    cs ce ccs cce min-indent max-indent block)))
*************** changed with `comment-style'."
*** 1209,1215 ****
           (progn (goto-char end) (end-of-line) (skip-syntax-backward " ")
                  (<= (point) end))
           (or block (not (string= "" comment-end)))
!          (or block (progn (goto-char beg) (search-forward "\n" end t)))))
  
      ;; don't add end-markers just because the user asked for `block'
      (unless (or lines (string= "" comment-end)) (setq block nil))
--- 1214,1222 ----
           (progn (goto-char end) (end-of-line) (skip-syntax-backward " ")
                  (<= (point) end))
           (or block (not (string= "" comment-end)))
!          (or block (progn (goto-char beg) (search-forward
!                                              "\n"
!                                              (min (1+ end) (point-max)) t)))))
  
      ;; don't add end-markers just because the user asked for `block'
      (unless (or lines (string= "" comment-end)) (setq block nil))

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