Add support for VT200-style mouse input.

Right now if applications want to use the mouse on the command line,
they use sysmouse(4) and install a signal handler in the kernel to
deliver signals when mouse events arrive. This conflicts with my plan to
change to TERM=xterm, so implement proper VT200-style mouse input.

Because mouse input is now streamed through the TTY, it means you can
now SSH to another system on the console and use the mouse there as
well. The disadvantage of the VT200 mouse protocol, is that it doesn't
seem to generate events when moving the cursor. Only when pressing and
releasing mouse buttons.

There are different protocols as well, but this one seems to be most
commonly supported.

Reported by:	Paul B. Mahol <onemda gmail com>
Tested with:	vim(1)

2 files changed, 7 insertions, 0 deletions

diff --git a/sys/teken/teken.h b/sys/teken/teken.h
index aab037f..22b5745 100644
--- a/sys/teken/teken.h
+++ b/sys/teken/teken.h
@@ -97,6 +97,7 @@ typedef void tf_param_t(void *, int, unsigned int);
 #define	TP_SETBELLPD	6
 #define	TP_SETBELLPD_PITCH(pd)		((pd) >> 16)
 #define	TP_SETBELLPD_DURATION(pd)	((pd) & 0xffff)
+#define	TP_MOUSE	7
 typedef void tf_respond_t(void *, const void *, size_t);
 
 typedef struct {
diff --git a/sys/teken/teken_subr.h b/sys/teken/teken_subr.h
index 32cae4d..b8ebcdc 100644
--- a/sys/teken/teken_subr.h
+++ b/sys/teken/teken_subr.h
@@ -932,6 +932,9 @@ teken_subr_reset_dec_mode(teken_t *t, unsigned int cmd)
 	case 47: /* Switch to alternate buffer. */
 		teken_printf("Switch to alternate buffer\n");
 		break;
+	case 1000: /* Mouse input. */
+		teken_funcs_param(t, TP_MOUSE, 0);
+		break;
 	default:
 		teken_printf("Unknown DECRST: %u\n", cmd);
 	}
@@ -1078,6 +1081,9 @@ teken_subr_set_dec_mode(teken_t *t, unsigned int cmd)
 	case 47: /* Switch to alternate buffer. */
 		teken_printf("Switch away from alternate buffer\n");
 		break;
+	case 1000: /* Mouse input. */
+		teken_funcs_param(t, TP_MOUSE, 1);
+		break;
 	default:
 		teken_printf("Unknown DECSET: %u\n", cmd);
 	}