From 8fce33afe074bb769eb3bf73d8d15582463a027b Mon Sep 17 00:00:00 2001
From: Benno Schulenberg <bensberg@telfort.nl>
Date: Fri, 26 Apr 2019 10:37:04 +0200
Subject: [PATCH] text: copy leading quote characters when automatic
 hard-wrapping occurs
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When the user is typing a long text and --breaklonglines is in effect,
then any leading comment or quoting characters are automatically added
to each automatic new line.

This fulfills https://savannah.gnu.org/bugs/?56042.
Requested-by: Sébastien Desreux <seb@h-k.fr>
---
 src/proto.h |  1 +
 src/text.c  | 43 ++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/src/proto.h b/src/proto.h
index 8fb5ce8c..7b58b093 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -533,6 +533,7 @@ ssize_t break_line(const char *line, ssize_t goal, bool snap_at_nl);
 size_t indent_length(const char *line);
 #endif
 #ifdef ENABLE_JUSTIFY
+size_t quote_length(const char *line);
 bool begpar(const linestruct *const foo, int depth);
 bool inpar(const linestruct *const foo);
 void do_justify(bool full_justify);
diff --git a/src/text.c b/src/text.c
index 24eb0788..be125f0e 100644
--- a/src/text.c
+++ b/src/text.c
@@ -1426,6 +1426,13 @@ bool do_wrap(void)
 
 	add_undo(SPLIT_BEGIN);
 #endif
+#ifdef ENABLE_JUSTIFY
+	bool autowhite = ISSET(AUTOINDENT);
+	size_t lead_len = quote_length(line->data);
+
+	if (lead_len > 0)
+		UNSET(AUTOINDENT);
+#endif
 
 	/* The remainder is the text that will be wrapped to the next line. */
 	remainder = line->data + wrap_loc;
@@ -1455,10 +1462,19 @@ bool do_wrap(void)
 #endif
 		}
 
-		/* Join the next line to this one, and delete any extra blanks. */
-		do {
+		/* Join the next line to this one. */
+		do_delete();
+
+#ifdef ENABLE_JUSTIFY
+		/* If the quoting part of the current line equals the quoting part of
+		 * what was the next line, then strip this second quoting part. */
+		if (strncmp(line->data, line->data + openfile->current_x, lead_len) == 0)
+			for (size_t i = lead_len; i > 0; i--)
+				do_delete();
+#endif
+		/* Remove any extra blanks. */
+		while (is_blank_mbchar(&line->data[openfile->current_x]))
 			do_delete();
-		} while (is_blank_mbchar(&line->data[openfile->current_x]));
 	}
 
 	/* Go to the wrap location. */
@@ -1480,6 +1496,27 @@ bool do_wrap(void)
 	/* Now split the line. */
 	do_enter();
 
+#ifdef ENABLE_JUSTIFY
+	/* If the original line has quoting, copy it to the spillage line. */
+	if (lead_len > 0) {
+		lead_len += indent_length(line->data + lead_len);
+
+		line = line->next;
+		line_len = strlen(line->data);
+		line->data = charealloc(line->data, lead_len + line_len + 1);
+
+		charmove(line->data + lead_len, line->data, line_len + 1);
+		strncpy(line->data, line->prev->data, lead_len);
+
+		openfile->current_x += lead_len;
+#ifndef NANO_TINY
+		update_undo(ENTER);
+#endif
+		if (autowhite)
+			SET(AUTOINDENT);
+	}
+#endif
+
 	openfile->spillage_line = openfile->current;
 
 	if (cursor_x < wrap_loc) {