🚀 go-pugleaf

In article <5426@dove.nist.gov> bagwill@swe.ncsl.nist.gov (Bob &) writes:
>What should be in ae, as, and ac to get a termcap-using program to use
>the graphics characters?  Thanks

eA	str	(P)	Enable alternate/graphic character set
as	str	(P)	Enter alternate/graphic character set mode
ac	str		Graphic character set pairs aAbBcC \- def=VT100
ae	str	(P)	Exit alternate/graphic character set mode

The way this is supposed to work is:

eA is whatever is needed as a one-time initialization to allow the other
codes to function.

as enters the alternate-character-set mode.  Line-drawing characters are
just "alternate" glyphs displayed when "normal" characters are sent to
the terminal while it's in this mode.

ae leaves the alternate-character-set mode, so that normal characters
will subsequently display normally.

The ac string consists of adjacent pairs of (VT100,your-terminal)
characters; the VT100 member is the normal character which produces
a defined line-drawing glyph when sent to a VT100 in alternate-
character-set mode, and the your-terminal member is the corresponding
character that produces the SAME GLYPH when sent to YOUR terminal
while it is in alternate-character-set mode.  In principle, the VT100
termcap entry should include something like:
	:ac=++,,..00II--''aaffgghhjjkkllmmnnooqqssttuuvvwwxx~~:
because obviously the two characters in each pair are identical for
VT100 terminal type!
	+	right-arrow
	,	left-arrow
	.	down-arrow
	0	solid square block
	I	lantern
	-	up-arrow
	'	diamond
	a	checkerboard
	f	degrees
	g	plus-or-minus
	h	square board
	j	LRC of box
	k	URC of box
	l	ULC of box
	m	LLC of box
	n	H/V crossing
	o	scan-line 1
	q	horizontal
	s	scan-line 9
	t	left-tee
	u	right-tee
	v	down-tee
	w	up-tee
	x	vertical
	~	bullet