Do not close popups on resize, instead adjust them to fit, from Anindya

Mukherjee.

cmd-display-panes.c

@@ -286,12 +286,12 @@ cmd_display_panes_exec(struct cmd *self, struct cmdq_item *item)
 
 	if (args_has(args, 'N')) {
 		server_client_set_overlay(tc, delay, NULL, NULL,
-		    cmd_display_panes_draw, NULL, cmd_display_panes_free,
+		    cmd_display_panes_draw, NULL, cmd_display_panes_free, NULL,
 		    cdata);
 	} else {
 		server_client_set_overlay(tc, delay, NULL, NULL,
 		    cmd_display_panes_draw, cmd_display_panes_key,
-		    cmd_display_panes_free, cdata);
+		    cmd_display_panes_free, NULL, cdata);
 	}
 
 	if (args_has(args, 'b'))

menu.c

@@ -390,6 +390,6 @@ menu_display(struct menu *menu, int flags, struct cmdq_item *item, u_int px,
 	md->data = data;
 
 	server_client_set_overlay(c, 0, NULL, menu_mode_cb, menu_draw_cb,
-	    menu_key_cb, menu_free_cb, md);
+	    menu_key_cb, menu_free_cb, NULL, md);
 	return (0);
 }

popup.c

@@ -39,11 +39,18 @@ struct popup_data {
 	popup_close_cb		  cb;
 	void			 *arg;
 
+	/* Current position and size. */
 	u_int			  px;
 	u_int			  py;
 	u_int			  sx;
 	u_int			  sy;
 
+	/* Preferred position and size. */
+	u_int			  ppx;
+	u_int			  ppy;
+	u_int			  psx;
+	u_int			  psy;
+
 	enum { OFF, MOVE, SIZE }  dragging;
 	u_int			  dx;
 	u_int			  dy;
@@ -133,9 +140,14 @@ popup_draw_cb(struct client *c, __unused struct screen_redraw_ctx *ctx0)
 	screen_init(&s, pd->sx, pd->sy, 0);
 	screen_write_start(&ctx, &s);
 	screen_write_clearscreen(&ctx, 8);
-	screen_write_box(&ctx, pd->sx, pd->sy);
-	screen_write_cursormove(&ctx, 1, 1, 0);
-	screen_write_fast_copy(&ctx, &pd->s, 0, 0, pd->sx - 2, pd->sy - 2);
+
+	/* Skip drawing popup if the terminal is too small. */
+	if (pd->sx > 2 && pd->sy > 2) {
+		screen_write_box(&ctx, pd->sx, pd->sy);
+		screen_write_cursormove(&ctx, 1, 1, 0);
+		screen_write_fast_copy(&ctx, &pd->s, 0, 0, pd->sx - 2,
+		    pd->sy - 2);
+	}
 	screen_write_stop(&ctx);
 
 	c->overlay_check = NULL;
@@ -171,6 +183,41 @@ popup_free_cb(struct client *c)
 	free(pd);
 }
 
+static void
+popup_resize_cb(struct client *c)
+{
+	struct popup_data	*pd = c->overlay_data;
+	struct tty		*tty = &c->tty;
+
+	if (pd == NULL)
+		return;
+
+	/* Adjust position and size. */
+	if (pd->psy > tty->sy)
+		pd->sy = tty->sy;
+	else
+		pd->sy = pd->psy;
+	if (pd->psx > tty->sx)
+		pd->sx = tty->sx;
+	else
+		pd->sx = pd->psx;
+	if (pd->ppy + pd->sy > tty->sy)
+		pd->py = tty->sy - pd->sy;
+	else
+		pd->py = pd->ppy;
+	if (pd->ppx + pd->sx > tty->sx)
+		pd->px = tty->sx - pd->sx;
+	else
+		pd->px = pd->ppx;
+
+	/* Avoid zero size screens. */
+	if (pd->sx > 2 && pd->sy > 2) {
+		screen_resize(&pd->s, pd->sx - 2, pd->sy - 2, 0);
+		if (pd->job != NULL)
+			job_resize(pd->job, pd->sx - 2, pd->sy - 2);
+	}
+}
+
 static void
 popup_handle_drag(struct client *c, struct popup_data *pd,
     struct mouse_event *m)
@@ -196,6 +243,8 @@ popup_handle_drag(struct client *c, struct popup_data *pd,
 		pd->py = py;
 		pd->dx = m->x - pd->px;
 		pd->dy = m->y - pd->py;
+		pd->ppx = px;
+		pd->ppy = py;
 		server_redraw_client(c);
 	} else if (pd->dragging == SIZE) {
 		if (m->x < pd->px + 3)
@@ -204,6 +253,8 @@ popup_handle_drag(struct client *c, struct popup_data *pd,
 			return;
 		pd->sx = m->x - pd->px;
 		pd->sy = m->y - pd->py;
+		pd->psx = pd->sx;
+		pd->psy = pd->sy;
 
 		screen_resize(&pd->s, pd->sx - 2, pd->sy - 2, 0);
 		if (pd->job != NULL)
@@ -348,13 +399,18 @@ popup_display(int flags, struct cmdq_item *item, u_int px, u_int py, u_int sx,
 	pd->sx = sx;
 	pd->sy = sy;
 
+	pd->ppx = px;
+	pd->ppy = py;
+	pd->psx = sx;
+	pd->psy = sy;
+
 	pd->job = job_run(shellcmd, argc, argv, s, cwd,
 	    popup_job_update_cb, popup_job_complete_cb, NULL, pd,
 	    JOB_NOWAIT|JOB_PTY|JOB_KEEPWRITE, pd->sx - 2, pd->sy - 2);
 	pd->ictx = input_init(NULL, job_get_event(pd->job));
 
 	server_client_set_overlay(c, 0, popup_check_cb, popup_mode_cb,
-	    popup_draw_cb, popup_key_cb, popup_free_cb, pd);
+	    popup_draw_cb, popup_key_cb, popup_free_cb, popup_resize_cb, pd);
 	return (0);
 }
 

server-client.c

@@ -93,7 +93,7 @@ void
 server_client_set_overlay(struct client *c, u_int delay,
     overlay_check_cb checkcb, overlay_mode_cb modecb,
     overlay_draw_cb drawcb, overlay_key_cb keycb, overlay_free_cb freecb,
-    void *data)
+    overlay_resize_cb resizecb, void *data)
 {
 	struct timeval	tv;
 
@@ -114,6 +114,7 @@ server_client_set_overlay(struct client *c, u_int delay,
 	c->overlay_draw = drawcb;
 	c->overlay_key = keycb;
 	c->overlay_free = freecb;
+	c->overlay_resize = resizecb;
 	c->overlay_data = data;
 
 	c->tty.flags |= TTY_FREEZE;
@@ -2061,9 +2062,12 @@ server_client_dispatch(struct imsg *imsg, void *arg)
 		if (c->flags & CLIENT_CONTROL)
 			break;
 		server_client_update_latest(c);
-		server_client_clear_overlay(c);
 		tty_resize(&c->tty);
 		recalculate_sizes();
+		if (c->overlay_resize == NULL)
+			server_client_clear_overlay(c);
+		else
+			c->overlay_resize(c);
 		server_redraw_client(c);
 		if (c->session != NULL)
 			notify_client("client-resized", c);

tmux.h

@@ -1629,6 +1629,7 @@ typedef struct screen *(*overlay_mode_cb)(struct client *, u_int *, u_int *);
 typedef void (*overlay_draw_cb)(struct client *, struct screen_redraw_ctx *);
 typedef int (*overlay_key_cb)(struct client *, struct key_event *);
 typedef void (*overlay_free_cb)(struct client *);
+typedef void (*overlay_resize_cb)(struct client *);
 struct client {
 	const char	*name;
 	struct tmuxpeer	*peer;
@@ -1776,6 +1777,7 @@ struct client {
 	overlay_draw_cb	 overlay_draw;
 	overlay_key_cb	 overlay_key;
 	overlay_free_cb	 overlay_free;
+	overlay_resize_cb overlay_resize;
 	void		*overlay_data;
 	struct event	 overlay_timer;
 
@@ -2483,7 +2485,7 @@ RB_PROTOTYPE(client_windows, client_window, entry, server_client_window_cmp);
 u_int	 server_client_how_many(void);
 void	 server_client_set_overlay(struct client *, u_int, overlay_check_cb,
 	     overlay_mode_cb, overlay_draw_cb, overlay_key_cb,
-	     overlay_free_cb, void *);
+	     overlay_free_cb, overlay_resize_cb, void *);
 void	 server_client_clear_overlay(struct client *);
 void	 server_client_set_key_table(struct client *, const char *);
 const char *server_client_get_key_table(struct client *);