nano

commit fcf598e79790a3156c277c065186599955017a0d
parent d9cb12f6e3e0610d62d74ffdc8784753bf7f1d4a
Author: Benno Schulenberg <bensberg@telfort.nl>
Date:   Mon, 28 Mar 2022 11:15:04 +0200

execute: stay on the same line number when filtering the whole buffer

When the filter command makes just small, per-line changes, keeping the
cursor at the same line number allows the user to observe the effect of
the changes -- which is not possible when the cursor gets moved to the
end of the buffer.

This partially fulfills https://savannah.gnu.org/bugs/?57248.

Diffstat:
M
src/files.c
 | 
6
+++++-

1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/files.c b/src/files.c
@@ -992,6 +992,7 @@ bool execute_command(const char *command)
 		/* The pipes through which text will be written and read. */
 	struct sigaction oldaction, newaction = {{0}};
 		/* Original and temporary handlers for SIGINT. */
+	ssize_t was_lineno = (openfile->mark ? 0 : openfile->current->lineno);
 	const bool should_pipe = (command[0] == '|');
 	FILE *stream;
 
@@ -1105,8 +1106,11 @@ bool execute_command(const char *command)
 	else
 		read_file(stream, 0, "pipe", TRUE);
 
-	if (should_pipe && !ISSET(MULTIBUFFER))
+	if (should_pipe && !ISSET(MULTIBUFFER)) {
+		if (was_lineno)
+			goto_line_posx(was_lineno, 0);
 		add_undo(COUPLE_END, N_("filtering"));
+	}
 
 	/* Wait for the external command (and possibly data sender) to terminate. */
 	wait(NULL);