# st

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    commit e8392b282c2eaa28725241a9612804fb55113da4
    parent f8afebdfa0cc9a57b22c39c47e9b585f69453eb7
    Author: Avi Halachmi (:avih) <avihpit@yahoo.com>
    Date:   Thu, 14 May 2020 18:18:07 +0300

    support REP (repeat) escape sequence

    The sequence \e[Nb prints the last printed char N (more) times if it's
    printable, and it's ignored after newline or other control chars.

    This is Ecma-048/ANSI-X3.6 sequence and not DEC VT. It's supported by
    xterm, and ncurses uses it when possible, e.g. when TERM is xterm* (and
    with this commit also st*).

    xterm supports only codepoints<=255, possibly due to internal limits.
    We support any value/codepoint which was placed in a cell.

    To test:
    - tput rep 65 4 -> prints 'AAAA'
    - printf "\342\225\246\033[4b" -> prints U+2566 1+4 times.

    Diffstat:
    Mst.c | 10++++++++++
    Mst.info | 1+

    2 files changed, 11 insertions(+), 0 deletions(-)
    diff --git a/st.c b/st.c
    @@ -129,6 +129,7 @@ typedef struct {
     	int charset;  /* current charset */
     	int icharset; /* selected charset for sequence */
     	int *tabs;
    +	Rune lastc;   /* last printed char outside of sequence, 0 if control */
     } Term;

     /* CSI Escape sequence structs */
    @@ -1648,6 +1649,12 @@ csihandle(void)
     		if (csiescseq.arg[0] == 0)
     			ttywrite(vtiden, strlen(vtiden), 0);
     		break;
    +	case 'b': /* REP -- if last char is printable print it <n> more times */
    +		DEFAULT(csiescseq.arg[0], 1);
    +		if (term.lastc)
    +			while (csiescseq.arg[0]-- > 0)
    +				tputc(term.lastc);
    +		break;
     	case 'C': /* CUF -- Cursor <n> Forward */
     	case 'a': /* HPR -- Cursor <n> Forward */
     		DEFAULT(csiescseq.arg[0], 1);
    @@ -2373,6 +2380,8 @@ check_control_code:
     		/*
     		 * control codes are not shown ever
     		 */
    +		if (!term.esc)
    +			term.lastc = 0;
     		return;
     	} else if (term.esc & ESC_START) {
     		if (term.esc & ESC_CSI) {
    @@ -2422,6 +2431,7 @@ check_control_code:
     	}

     	tsetchar(u, &term.c.attr, term.c.x, term.c.y);
    +	term.lastc = u;

     	if (width == 2) {
     		gp->mode |= ATTR_WIDE;
    diff --git a/st.info b/st.info
    @@ -184,6 +184,7 @@ st-mono| simpleterm monocolor,
     # XTerm extensions
     	rmxx=\E[29m,
     	smxx=\E[9m,
    +	rep=%p1%c\E[%p2%{1}%-%db,
     # tmux extensions, see TERMINFO EXTENSIONS in tmux(1)
     	Tc,
     	Ms=\E]52;%p1%s;%p2%s\007,