Support "bracketed paste" mode. This adds a -p flag to paste-buffer - if

this is used and the application has requested bracketed pastes, then
tmux surrounds the pasted text by \033[200~ and \033[201~. Applications
like vim can (apparently) use this to avoid, for example, indenting the
text. From Ailin Nemui.

cmd-paste-buffer.c

@@ -30,13 +30,13 @@
 
 int	cmd_paste_buffer_exec(struct cmd *, struct cmd_ctx *);
 
-void	cmd_paste_buffer_filter(
-	    struct window_pane *, const char *, size_t, const char *);
+void	cmd_paste_buffer_filter(struct window_pane *,
+	    const char *, size_t, const char *, int bracket);
 
 const struct cmd_entry cmd_paste_buffer_entry = {
 	"paste-buffer", "pasteb",
-	"db:rs:t:", 0, 0,
-	"[-dr] [-s separator] [-b buffer-index] [-t target-pane]",
+	"db:prs:t:", 0, 0,
+	"[-dpr] [-s separator] [-b buffer-index] [-t target-pane]",
 	0,
 	NULL,
 	NULL,
@@ -53,6 +53,7 @@ cmd_paste_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
 	const char		*sepstr;
 	char			*cause;
 	int			 buffer;
+	int			 pflag;
 
 	if (cmd_find_pane(ctx, args_get(args, 't'), &s, &wp) == NULL)
 		return (-1);
@@ -86,7 +87,9 @@ cmd_paste_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
 			else
 				sepstr = "\r";
 		}
-		cmd_paste_buffer_filter(wp, pb->data, pb->size, sepstr);
+		pflag = args_has(args, 'p') &&
+		    (wp->screen->mode & MODE_BRACKETPASTE);
+		cmd_paste_buffer_filter(wp, pb->data, pb->size, sepstr, pflag);
 	}
 
 	/* Delete the buffer if -d. */
@@ -102,13 +105,16 @@ cmd_paste_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
 
 /* Add bytes to a buffer and filter '\n' according to separator. */
 void
-cmd_paste_buffer_filter(
-    struct window_pane *wp, const char *data, size_t size, const char *sep)
+cmd_paste_buffer_filter(struct window_pane *wp,
+    const char *data, size_t size, const char *sep, int bracket)
 {
 	const char	*end = data + size;
 	const char	*lf;
 	size_t		 seplen;
 
+	if (bracket)
+		bufferevent_write(wp->event, "\033[200~", 6);
+
 	seplen = strlen(sep);
 	while ((lf = memchr(data, '\n', end - data)) != NULL) {
 		if (lf != data)
@@ -119,4 +125,7 @@ cmd_paste_buffer_filter(
 
 	if (end != data)
 		bufferevent_write(wp->event, data, end - data);
+
+	if (bracket)
+		bufferevent_write(wp->event, "\033[201~", 6);
 }

input.c

@@ -1212,6 +1212,9 @@ input_csi_dispatch(struct input_ctx *ictx)
 		case 1049:
 			window_pane_alternate_off(wp, &ictx->cell);
 			break;
+		case 2004:
+			screen_write_bracketpaste(&ictx->ctx, 0);
+			break;
 		default:
 			log_debug("%s: unknown '%c'", __func__, ictx->ch);
 			break;
@@ -1264,6 +1267,9 @@ input_csi_dispatch(struct input_ctx *ictx)
 		case 1049:
 			window_pane_alternate_on(wp, &ictx->cell);
 			break;
+		case 2004:
+			screen_write_bracketpaste(&ictx->ctx, 1);
+			break;
 		default:
 			log_debug("%s: unknown '%c'", __func__, ictx->ch);
 			break;

screen-write.c

@@ -878,6 +878,18 @@ screen_write_mousemode_on(struct screen_write_ctx *ctx, int mode)
 	s->mode |= mode;
 }
 
+/* Set bracketed paste mode. */
+void
+screen_write_bracketpaste(struct screen_write_ctx *ctx, int state)
+{
+	struct screen	*s = ctx->s;
+
+	if (state)
+		s->mode |= MODE_BRACKETPASTE;
+	else
+		s->mode &= ~MODE_BRACKETPASTE;
+}
+
 /* Line feed. */
 void
 screen_write_linefeed(struct screen_write_ctx *ctx, int wrapped)

tmux.1

@@ -3084,7 +3084,7 @@ List the global buffers.
 Load the contents of the specified paste buffer from
 .Ar path .
 .It Xo Ic paste-buffer
-.Op Fl dr
+.Op Fl dpr
 .Op Fl b Ar buffer-index
 .Op Fl s Ar separator
 .Op Fl t Ar target-pane
@@ -3103,6 +3103,10 @@ flag.
 The
 .Fl r
 flag means to do no replacement (equivalent to a separator of LF).
+If
+.Fl p
+is specified, paste bracket control codes are inserted around the
+buffer if the application has requested bracketed paste mode.
 .It Xo Ic save-buffer
 .Op Fl a
 .Op Fl b Ar buffer-index

tmux.h

@@ -573,6 +573,7 @@ struct mode_key_table {
 #define MODE_MOUSE_BUTTON 0x40
 #define MODE_MOUSE_ANY 0x80
 #define MODE_MOUSE_UTF8 0x100
+#define MODE_BRACKETPASTE 0x200
 
 #define ALL_MOUSE_MODES (MODE_MOUSE_STANDARD|MODE_MOUSE_BUTTON|MODE_MOUSE_ANY)
 
@@ -1883,6 +1884,7 @@ void	 screen_write_cell(struct screen_write_ctx *,
 	     const struct grid_cell *, const struct utf8_data *);
 void	 screen_write_setselection(struct screen_write_ctx *, u_char *, u_int);
 void	 screen_write_rawstring(struct screen_write_ctx *, u_char *, u_int);
+void	 screen_write_bracketpaste(struct screen_write_ctx *, int);
 
 /* screen-redraw.c */
 void	 screen_redraw_screen(struct client *, int, int);

tty.c

@@ -480,6 +480,12 @@ tty_update_mode(struct tty *tty, int mode, struct screen *s)
 		else
 			tty_putcode(tty, TTYC_RMKX);
 	}
+	if (changed & MODE_BRACKETPASTE) {
+		if (mode & MODE_BRACKETPASTE)
+			tty_puts(tty, "\033[?2004h");
+		else
+			tty_puts(tty, "\033[?2004l");
+	}
 	tty->mode = mode;
 }