// Request Cursor position report:
static termrequest_T u7_status = TERMREQUEST_INIT;
+// Request xterm compatibility check:
+static termrequest_T xcc_status = TERMREQUEST_INIT;
+
# ifdef FEAT_TERMINAL
// Request foreground color report:
static termrequest_T rfg_status = TERMREQUEST_INIT;
static termrequest_T *all_termrequests[] = {
&crv_status,
&u7_status,
+ &xcc_status,
# ifdef FEAT_TERMINAL
&rfg_status,
# endif
#ifdef FEAT_TERMRESPONSE
static int check_for_codes = FALSE; // check for key code response
static int is_not_xterm = FALSE; // recognized not-really-xterm
+static int xcc_test_failed = FALSE; // xcc_status check failed
#endif
static struct builtin_term *
}
/*
- * Check how the terminal treats ambiguous character width (UAX #11).
- * First, we move the cursor to (1, 0) and print a test ambiguous character
- * \u25bd (WHITE DOWN-POINTING TRIANGLE) and query current cursor position.
- * If the terminal treats \u25bd as single width, the position is (1, 1),
- * or if it is treated as double width, that will be (1, 2).
- * This function has the side effect that changes cursor position, so
- * it must be called immediately after entering termcap mode.
+ * Send sequences to the terminal and check with t_u7 how the cursor moves, to
+ * find out properties of the terminal.
*/
void
-may_req_ambiguous_char_width(void)
+check_terminal_behavior(void)
{
+ int did_send = FALSE;
+
+ if (!can_get_termresponse() || starting != 0 || *T_U7 == NUL)
+ return;
+
if (u7_status.tr_progress == STATUS_GET
- && can_get_termresponse()
- && starting == 0
- && *T_U7 != NUL
&& !option_was_set((char_u *)"ambiwidth"))
{
char_u buf[16];
- LOG_TR(("Sending U7 request"));
+ // Ambiguous width check.
+ // Check how the terminal treats ambiguous character width (UAX #11).
+ // First, we move the cursor to (1, 0) and print a test ambiguous
+ // character \u25bd (WHITE DOWN-POINTING TRIANGLE) and then query
+ // the current cursor position. If the terminal treats \u25bd as
+ // single width, the position is (1, 1), or if it is treated as double
+ // width, that will be (1, 2). This function has the side effect that
+ // changes cursor position, so it must be called immediately after
+ // entering termcap mode.
+ LOG_TR(("Sending request for ambiwidth check"));
// Do this in the second row. In the first row the returned sequence
// may be CSI 1;2R, which is the same as <S-F3>.
term_windgoto(1, 0);
- buf[mb_char2bytes(0x25bd, buf)] = 0;
+ buf[mb_char2bytes(0x25bd, buf)] = NUL;
out_str(buf);
out_str(T_U7);
termrequest_sent(&u7_status);
out_flush();
+ did_send = TRUE;
// This overwrites a few characters on the screen, a redraw is needed
// after this. Clear them out for now.
screen_stop_highlight();
term_windgoto(1, 0);
out_str((char_u *)" ");
+ }
+
+ if (xcc_status.tr_progress == STATUS_GET)
+ {
+ // 2. Check compatibility with xterm.
+ // We move the cursor to (2, 0), print a test sequence and then query
+ // the current cursor position. If the terminal properly handles
+ // unknown DCS string and CSI sequence with intermediate byte, the test
+ // sequence is ignored and the cursor does not move. If the terminal
+ // handles test sequence incorrectly, a garbage string is displayed and
+ // the cursor does move.
+ LOG_TR(("Sending xterm compatibility test sequence."));
+ // Do this in the third row. Second row is used by ambiguous
+ // chararacter width check.
+ term_windgoto(2, 0);
+ // send the test DCS string.
+ out_str((char_u *)"\033Pzz\033\\");
+ // send the test CSI sequence with intermediate byte.
+ out_str((char_u *)"\033[0%m");
+ out_str(T_U7);
+ termrequest_sent(&xcc_status);
+ out_flush();
+ did_send = TRUE;
+
+ // If the terminal handles test sequence incorrectly, garbage text is
+ // displayed. Clear them out for now.
+ screen_stop_highlight();
+ term_windgoto(2, 0);
+ out_str((char_u *)" ");
+ }
+
+ if (did_send)
+ {
term_windgoto(0, 0);
// Need to reset the known cursor position.
# endif
}
}
+ else if (arg[0] == 3)
+ {
+ // Third row: xterm compatibility test.
+ // If the cursor is not on the first column then the
+ // terminal is not xterm compatible.
+ if (arg[1] != 1)
+ xcc_test_failed = TRUE;
+ xcc_status.tr_progress = STATUS_GOT;
+ }
+
key_name[0] = (int)KS_EXTRA;
key_name[1] = (int)KE_IGNORE;
slen = csi_len;
else if (version == 115 && arg[0] == 0 && arg[2] == 0)
is_not_xterm = TRUE;
+ // GNU screen sends 83;30600;0, 83;40500;0, etc.
+ // 30600/40500 is a version number of GNU screen. DA2
+ // support is added on 3.6. DCS string has a special
+ // meaning to GNU screen, but xterm compatibility
+ // checking does not detect GNU screen.
+ if (version >= 30600 && arg[0] == 83)
+ xcc_test_failed = TRUE;
+
// Xterm first responded to this request at patch level
// 95, so assume anything below 95 is not xterm.
if (version < 95)
// Only request the cursor style if t_SH and t_RS are
// set. Only supported properly by xterm since version
// 279 (otherwise it returns 0x18).
+ // Only when the xcc_status was set, the test finished,
+ // and xcc_test_failed is FALSE;
// Not for Terminal.app, it can't handle t_RS, it
// echoes the characters to the screen.
if (rcs_status.tr_progress == STATUS_GET
+ && xcc_status.tr_progress == STATUS_GOT
+ && !xcc_test_failed
&& version >= 279
- && !is_not_xterm
&& *T_CSH != NUL
&& *T_CRS != NUL)
{
// Only request the cursor blink mode if t_RC set. Not
// for Gnome terminal, it can't handle t_RC, it
// echoes the characters to the screen.
+ // Only when the xcc_status was set, the test finished,
+ // and xcc_test_failed is FALSE;
if (rbm_status.tr_progress == STATUS_GET
- && !is_not_xterm
+ && xcc_status.tr_progress == STATUS_GOT
+ && !xcc_test_failed
&& *T_CRC != NUL)
{
LOG_TR(("Sending cursor blink mode request"));
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