st

Personal fork of ST from suckless.org; st is a simple terminal implementation for X.
git clone git://git.swab.dev/st.git
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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,