Re: Bug: ODT export of Chinese text inserts spaces for line breaks

[Ihor Radchenko]

Maxim Nikulin <manikulin@gmail.com> writes:

> On 29/06/2021 10:47, James Harkins wrote:
>> * Test
>> 1本人不想亲自拿到学历学位证书、急于离校者,可书面委托他人代领学历学位证
>> 书,29日起即可离校;2本人想亲自领取学历学位证书者,按学校规定的程序及有关
>> 要求办理离校手续,领取相关证书后离校;
>
>> Exporting to ODT produces the following (body text, omitting titles,
>> headers and such).
>> 
>> 1本人不想亲自拿到学历学位证书、急于离校者,可书面委托他人代领学历学位证 书,29日起即可离校;2本人想亲自领取学历学位证书者,按学校规定的程序及有关 
>> 要求办理离校手续,领取相关证书后离校;
>
> Confirmed: newlines are copied to ODT document as is and they appear as 
> spaces in libreoffice. I did not tried HTML since I am unsure if 
> browsers should glue paragraphs with newlines into continuous string 
> without spaces. Maybe it is necessary to add some attributes for proper 
> representation (e.g. "lang"), however "#+LANGUAGE: cn" does not help 
> even though libreoffice considers paragraph as Chinese.

Newlines appearing as spaces is in ODT schema.

> As to splicing lines, I found `fill-delete-newlines' that uses 
> `fill-nospace-between-words-table' besides ?| category to determine 
> whether space should be suppressed while splicing lines. In addition 
> there are some variables to tune behavior.

I am attaching the fix that leverages `fill-region' to handle all the
complexities for us. It is the easiest way and I see no reason to look
deeper.

>From 614944ba1ac5502c7648747363674b8d45bfaaf7 Mon Sep 17 00:00:00 2001
Message-Id: 
<614944ba1ac5502c7648747363674b8d45bfaaf7.1665234699.git.yantar92@gmail.com>
From: Ihor Radchenko <yantar92@gmail.com>
Date: Sat, 8 Oct 2022 21:08:47 +0800
Subject: [PATCH] ox-odt: Fix newlines replaced by spaces in Han script

* lisp/ox-odt.el (org-odt-plain-text): Use `fill-region' to unfill the
paragraphs with newlines accounting for scripts without spaces between
words.

Reported-by: James Harkins <jamshark70@zoho.com>
Link: https://orgmode.org/list/sbhnlv$4t1$1@ciao.gmane.io
---
 lisp/ox-odt.el | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/lisp/ox-odt.el b/lisp/ox-odt.el
index 208a39d9d..c989d2014 100644
--- a/lisp/ox-odt.el
+++ b/lisp/ox-odt.el
@@ -2903,9 +2903,20 @@ (defun org-odt-plain-text (text info)
        (setq output
              (replace-regexp-in-string (car pair) (cdr pair) output t nil))))
     ;; Handle break preservation if required.
-    (when (plist-get info :preserve-breaks)
-      (setq output (replace-regexp-in-string
-                   "\\(\\\\\\\\\\)?[ \t]*\n" "<text:line-break/>" output t)))
+    (if (plist-get info :preserve-breaks)
+        (setq output (replace-regexp-in-string
+                     "\\(\\\\\\\\\\)?[ \t]*\n" "<text:line-break/>" output t))
+      ;; OpenDocument schema recognizes newlines as spaces, which may
+      ;; not be desired in scripts that do not separate words with
+      ;; spaces (for example, Han script).  `fill-region' is able to
+      ;; handle such situations.
+      (setq output
+            (with-temp-buffer
+              (insert output)
+              ;; Unfill.
+              (let ((fill-column (point-max)))
+                (fill-region (point-min) (point-max)))
+              (buffer-string))))
     ;; Return value.
     output))
 
-- 
2.35.1

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
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