st

Suckless' st with my personal patches
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commit 7473a8d1a57e5f9aba41b953f4e498c35e1c9dc5
parent a3f7420310be0fd778ef9fe2abf20edc2d8dc81a
Author: Quentin Rameau <quinq@fifth.space>
Date:   Sun, 25 Feb 2024 01:31:31 +0100

Fix cursor move with wide glyphs

st would always move back 1 column,
even with wide glyhps (using more than a single column).

The glyph rune is set on its first column,
and the other ones are to 0,
so loop until we detect the start of the previous glyph.

Diffstat:
Mst.c | 10+++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/st.c b/st.c @@ -86,8 +86,8 @@ enum escape_state { typedef struct { Glyph attr; /* current char attributes */ - int x; - int y; + int x; /* terminal column */ + int y; /* terminal row */ char state; } TCursor; @@ -2175,12 +2175,16 @@ tstrsequence(uchar c) void tcontrolcode(uchar ascii) { + size_t i; + switch (ascii) { case '\t': /* HT */ tputtab(1); return; case '\b': /* BS */ - tmoveto(term.c.x-1, term.c.y); + for (i = 1; term.c.x && term.line[term.c.y][term.c.x - i].u == 0; ++i) + ; + tmoveto(term.c.x - i, term.c.y); return; case '\r': /* CR */ tmoveto(0, term.c.y);