vis: use internal file to show lua errors

This means no event handlers are run for it, hence there is no chance
for recursive errors.

3 files changed, 9 insertions, 6 deletions

diff --git a/vis-core.h b/vis-core.h
index 4a5d3fc..5480589 100644
--- a/vis-core.h
+++ b/vis-core.h
@@ -139,6 +139,7 @@ struct Vis {
 	File *files;                         /* all files currently managed by this editor instance */
 	File *command_file;                  /* special internal file used to store :-command prompt */
 	File *search_file;                   /* special internal file used to store /,? search prompt */
+	File *error_file;                    /* special internal file used to store lua error messages */
 	Win *windows;                        /* all windows currently managed by this editor instance */
 	Win *win;                            /* currently active/focused window */
 	Win *message_window;                 /* special window to display multi line messages */
diff --git a/vis-prompt.c b/vis-prompt.c
index 3711cc9..01dc916 100644
--- a/vis-prompt.c
+++ b/vis-prompt.c
@@ -189,18 +189,17 @@ void vis_info_hide(Vis *vis) {
 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;
-	}
-
+	if (!vis->message_window)
+		vis->message_window = window_new_file(vis, vis->error_file);
 	Win *win = vis->message_window;
+	if (!win)
+		return;
 	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);
+	vis_window_focus(win);
 }
 
 void vis_message_hide(Vis *vis) {
diff --git a/vis.c b/vis.c
index 1be6864..593c540 100644
--- a/vis.c
+++ b/vis.c
@@ -361,6 +361,8 @@ Vis *vis_new(Ui *ui, VisEvent *event) {
 		goto err;
 	if (!(vis->search_file = file_new_internal(vis, NULL)))
 		goto err;
+	if (!(vis->error_file = file_new_internal(vis, NULL)))
+		goto err;
 	if (!(vis->keymap = map_new()))
 		goto err;
 	vis->mode_prev = vis->mode = &vis_modes[VIS_MODE_NORMAL];
@@ -384,6 +386,7 @@ void vis_free(Vis *vis) {
 		vis_window_close(vis->windows);
 	file_free(vis, vis->command_file);
 	file_free(vis, vis->search_file);
+	file_free(vis, vis->error_file);
 	for (int i = 0; i < LENGTH(vis->registers); i++)
 		register_release(&vis->registers[i]);
 	vis->ui->free(vis->ui);