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
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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 = ""
-- setup
gpu.setResolution(mx,my)
gpu.fill(1,1,mx,my," ")
function termwrite(s)
s=s:gsub("\8","\27[D")
pc = gpu.get(cx,cy)
gpu.setForeground(0xFFFFFF)
gpu.setBackground(0)
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 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"
end
elseif mode == "v" then
if cc == "s" then -- save cursor
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sx, sy = cx, cy
mode = "n"
elseif cc == "u" then -- restore cursor
cx, cy = sx, sy
mode = "n"
elseif cc == "H" then -- cursor home or to
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local tx, ty = cs:match("(.-);(.-)")
tx, ty = tx or "1", ty or "1"
cx, cy = tonumber(tx), tonumber(ty)
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mode = "n"
elseif cc == "A" then -- cursor up
cy = cy - tonumber(cs) or 1
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mode = "n"
elseif cc == "B" then -- cursor down
cy = cy + tonumber(cs) or 1
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mode = "n"
elseif cc == "C" then -- cursor right
cx = cx + tonumber(cs) or 1
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mode = "n"
elseif cc == "D" then -- cursor left
cx = cx - tonumber(cs) or 1
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mode = "n"
elseif cc == "h" and lc == "7" then -- enable line wrap
lw = true
elseif cc == "l" and lc == "7" then -- disable line wrap
lw = false
end
cs = cs .. cc
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(0)
gpu.setBackground(0xFFFFFF)
gpu.set(cx,cy,pc)
gpu.setForeground(0xFFFFFF)
gpu.setBackground(0)
end
return termwrite
end