Improve Lua error reporting

Display Lua errors in a dedicated window/file. A typo or missing
dependency (e.g. lpeg) in visrc.lua will no longer silently fail
without any indication.

The Lua integration in view.h is not yet converted.

1 files changed, 23 insertions, 0 deletions

diff --git a/vis-prompt.c b/vis-prompt.c
index 4db1057..2441fa4 100644
--- a/vis-prompt.c
+++ b/vis-prompt.c
@@ -187,3 +187,26 @@ void vis_info_hide(Vis *vis) {
 	vis->ui->info_hide(vis->ui);
 }
 
+void vis_message_show(Vis *vis, const char *msg) {
+	if (!msg)
+		return;
+	if (!vis->message_window) {
+		if (!vis_window_new(vis, NULL))
+			return;
+		vis->message_window = vis->win;
+	}
+
+	Win *win = vis->message_window;
+	Text *txt = win->file->text;
+	size_t pos = text_size(txt);
+	text_appendf(txt, "%s\n", msg);
+	text_save(txt, NULL);
+	view_cursor_to(win->view, pos);
+}
+
+void vis_message_hide(Vis *vis) {
+	if (!vis->message_window)
+		return;
+	vis_window_close(vis->message_window);
+	vis->message_window = NULL;
+}