From 7b23c76b71cd9259d40f621a21b21c91386cbc41 Mon Sep 17 00:00:00 2001
From: Yuriy Skalko <yuriy.skalko@gmail.com>
Date: Sun, 27 Nov 2022 18:30:26 +0200
Subject: [PATCH] Add "semantic linefeeds" after punctuation marks.

We already had such breaks for dot.

File format change.
---
 development/FORMAT     |  4 ++++
 lib/lyx2lyx/lyx_2_4.py |  6 ++++--
 src/Paragraph.cpp      | 26 ++++++++++++++++++++++----
 src/version.h          |  4 ++--
 4 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/development/FORMAT b/development/FORMAT
index 0c41d8801c..5fcf13ebf1 100644
--- a/development/FORMAT
+++ b/development/FORMAT
@@ -7,6 +7,10 @@ changes happened in particular if possible. A good example would be
 
 -----------------------
 
+2022-11-27 Yuriy Skalko <yuriy.skalko@gmail.com>
+	* Format incremented to 611: Implement "semantic linefeeds" after punctuation marks.
+	  Dummy format change for now.
+
 2022-10-29 Jürgen Spitzmüller <spitz@lyx.org> 
 	* Format incremented to 610: InsetIndexMacros and new IndexInset params:
 	  - \begin_inset IndexMacro [see|seealso|subentry|sortkey], relating to
diff --git a/lib/lyx2lyx/lyx_2_4.py b/lib/lyx2lyx/lyx_2_4.py
index 73826a5f59..5c0507a5af 100644
--- a/lib/lyx2lyx/lyx_2_4.py
+++ b/lib/lyx2lyx/lyx_2_4.py
@@ -4621,10 +4621,12 @@ convert = [
            [607, []],
            [608, []],
            [609, []],
-           [610, []]
+           [610, []],
+           [611, []]
           ]
 
-revert =  [[609, [revert_index_macros]],
+revert =  [[610, []],
+           [609, [revert_index_macros]],
            [608, [revert_document_metadata]],
            [607, [revert_docbook_mathml_prefix]],
            [606, [revert_spellchecker_ignore]],
diff --git a/src/Paragraph.cpp b/src/Paragraph.cpp
index 3b3bc3913e..453b1e1bb5 100644
--- a/src/Paragraph.cpp
+++ b/src/Paragraph.cpp
@@ -1746,16 +1746,34 @@ void Paragraph::write(ostream & os, BufferParams const & bparams,
 			column = 0;
 			break;
 		case '.':
+		case '!':
+		case '?':
+		case ':':
+		case ';':
+		case ',':
+		case 0x061F:  // ؟ U+061F  ARABIC QUESTION MARK
+		case 0x061B:  // ؛ U+061B  ARABIC SEMICOLON
+		case 0x060C:  // ، U+060C  ARABIC COMMA
 			flushString(os, write_buffer);
 			if (i + 1 < size() && d->text_[i + 1] == ' ') {
-				os << ".\n";
+				os << to_utf8(docstring(1, c)) << '\n';
 				column = 0;
 			} else
-				os << '.';
+				os << to_utf8(docstring(1, c));
+			break;
+		case 0x2014:  // — U+2014  EM DASH
+		case 0x3002:  // 。 U+3002  IDEOGRAPHIC FULL STOP
+		case 0xFF01:  // ！ U+FF01  FULLWIDTH EXCLAMATION MARK
+		case 0xFF1F:  // ？ U+FF1F  FULLWIDTH QUESTION MARK
+		case 0xFF1A:  // ： U+FF1A  FULLWIDTH COLON
+		case 0xFF1B:  // ； U+FF1B  FULLWIDTH SEMICOLON
+		case 0xFF0C:  // ， U+FF0C  FULLWIDTH COMMA
+			flushString(os, write_buffer);
+			os << to_utf8(docstring(1, c)) << '\n';
+			column = 0;
 			break;
 		default:
-			if ((column > 70 && c == ' ')
-			    || column > 79) {
+			if (column > 500) {
 				flushString(os, write_buffer);
 				os << '\n';
 				column = 0;
diff --git a/src/version.h b/src/version.h
index b496d1045d..bfcd9869ae 100644
--- a/src/version.h
+++ b/src/version.h
@@ -32,8 +32,8 @@ extern char const * const lyx_version_info;
 
 // Do not remove the comment below, so we get merge conflict in
 // independent branches. Instead add your own.
-#define LYX_FORMAT_LYX 610 // spitz: inset index macros
-#define LYX_FORMAT_TEX2LYX 610
+#define LYX_FORMAT_LYX 611 // Yuriy Skalko: semantic linefeeds
+#define LYX_FORMAT_TEX2LYX 611
 
 #if LYX_FORMAT_TEX2LYX != LYX_FORMAT_LYX
 #ifndef _MSC_VER
-- 
2.39.5