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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}
- 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
-
- -- setup
- gpu.setResolution(mx,my)
- gpu.fill(1,1,mx,my," ")
-
- local function termwrite(s)
- local rs = ""
- s=s:gsub("\8","\27[D")
- pc = gpu.get(cx,cy)
- gpu.setForeground(fg)
- gpu.setBackground(bg)
- 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)
- 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"
- end
-
- elseif mode == "v" then
- mode = "n"
- if cc == "s" then -- save cursor
- 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+)")
- tx, ty = tx or "1", ty or "1"
- cx, cy = tonumber(tx), tonumber(ty)
- elseif cc == "A" then -- cursor up
- cy = cy - (tonumber(cs) or 1)
- elseif cc == "B" then -- cursor down
- cy = cy + (tonumber(cs) or 1)
- elseif cc == "C" then -- cursor right
- cx = cx + (tonumber(cs) or 1)
- elseif cc == "D" then -- cursor left
- cx = cx - (tonumber(cs) or 1)
- 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 == "K" then
- if lc == "1" then
- gpu.fill(1,cy,cx,1," ")
- elseif lc == "2" then
- gpu.fill(cx,cy,mx,1," ")
- else
- gpu.fill(1,cy,mx,1," ")
- end
- elseif cc == "J" then
- if lc == "1" then
- gpu.fill(1,1,mx,cy," ")
- elseif lc == "2" then
- gpu.full(1,1,mx,my," ")
- cx,cy = 1, 1
- else
- gpu.fill(1,cy,mx,my," ")
- end
- 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
- 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)
- gpu.set(cx,cy,pc)
- gpu.setForeground(fg)
- gpu.setBackground(bg)
- return rs
- end
-
- return termwrite
- end
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