From e8392b282c2eaa28725241a9612804fb55113da4 Mon Sep 17 00:00:00 2001
From: "Avi Halachmi (:avih)" <avihpit@yahoo.com>
Date: Thu, 14 May 2020 18:18:07 +0300
Subject: [PATCH] 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.
---
st.c | 10 ++++++++++
st.info | 1 +
2 files changed, 11 insertions(+)
diff --git a/st.c b/st.c
index 0d35613..54af098 100644
--- 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
index d0694e2..e5393db 100644
--- 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,
--
2.20.1