OC-PsychOS2/module/vt100.lua

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function vt100emu(gpu) -- takes GPU component proxy *gpu* and returns a function to write to it in a manner like an ANSI terminal
local colours = {0x0,0xFF0000,0x00FF00,0xFFFF00,0x0000FF,0xFF00FF,0x00B6FF,0xFFFFFF}
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local mx, my = gpu.maxResolution()
local cx, cy = 1, 1
local pc = " "
local lc = ""
local mode = "n"
local lw = true
local sx, sy = 1,1
local cs = ""
local bg, fg = 0, 0xFFFFFF
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-- setup
gpu.setResolution(mx,my)
gpu.fill(1,1,mx,my," ")
function termwrite(s)
local rs = ""
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s=s:gsub("\8","\27[D")
pc = gpu.get(cx,cy)
gpu.setForeground(fg)
gpu.setBackground(bg)
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gpu.set(cx,cy,pc)
for i = 1, s:len() do
local cc = s:sub(i,i)
if mode == "n" then
if cc == "\n" then -- line feed
cx, cy = 1, cy+1
elseif cc == "\r" then -- cursor home
cx = 1
elseif cc == "\27" then -- escape
mode = "e"
elseif cc == "\t" then
cx = 8*((cx+9)//8)
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elseif string.byte(cc) > 31 and string.byte(cc) < 127 then -- printable, I guess
gpu.set(cx, cy, cc)
cx = cx + 1
end
elseif mode == "e" then
if cc == "[" then
mode = "v"
cs = ""
elseif cc == "D" then -- scroll down
gpu.copy(1,2,mx,my-1,0,-1)
gpu.fill(1,my,mx,1," ")
cy=cy+1
mode = "n"
elseif cc == "M" then -- scroll up
gpu.copy(1,1,mx,my-1,0,1)
gpu.fill(1,1,mx,1," ")
mode = "n"
else
mode = "n"
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end
elseif mode == "v" then
mode = "n"
if cc == "s" then -- save cursor
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sx, sy = cx, cy
elseif cc == "u" then -- restore cursor
cx, cy = sx, sy
elseif cc == "H" then -- cursor home or to
local tx, ty = cs:match("(%d+);(%d+)")
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tx, ty = tx or "1", ty or "1"
cx, cy = tonumber(tx), tonumber(ty)
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elseif cc == "A" then -- cursor up
cy = cy - (tonumber(cs) or 1)
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elseif cc == "B" then -- cursor down
cy = cy + (tonumber(cs) or 1)
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elseif cc == "C" then -- cursor right
cx = cx + (tonumber(cs) or 1)
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elseif cc == "D" then -- cursor left
cx = cx - (tonumber(cs) or 1)
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elseif cc == "h" and lc == "7" then -- enable line wrap
lw = true
elseif cc == "l" and lc == "7" then -- disable line wrap
lw = false
elseif cc == "c" then
rs = string.format("%s\27[%d;%d0c",rs,mx,my)
elseif cc == "n" and lc == "6" then
rs = string.format("%s\27[%d;%dR",rs,cx,cy)
elseif cc == "m" then
for num in cs:gmatch("%d+") do
num=tonumber(num)
if num == 0 then
fg,bg = 0xFFFFFF,0
elseif num == 7 then
local nfg,nbg = bg, fg
fg, bg = nfg, nbg
elseif num > 29 and num < 38 then
fg = colours[num-29]
elseif num > 39 and num < 48 then
bg = colours[num-39]
end
end
gpu.setForeground(fg)
gpu.setBackground(bg)
else
cs = cs .. cc
if cc:match("[%d;]") then
mode = "v"
end
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end
end
if cx > mx and lw then
cx, cy = 1, cy+1
end
if cy > my then
gpu.copy(1,2,mx,my-1,0,-1)
gpu.fill(1,my,mx,1," ")
cy=my
end
if cy < 1 then cy = 1 end
if cx < 1 then cx = 1 end
lc = cc
end
pc = gpu.get(cx,cy)
gpu.setForeground(bg)
gpu.setBackground(fg)
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gpu.set(cx,cy,pc)
gpu.setForeground(fg)
gpu.setBackground(bg)
return rs
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end
return termwrite
end