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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 = 0 -- 0 normal, 1 escape, 2 command
- 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 checkCursor()
- 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
- end
-
- local function termwrite(s)
- local wb = ""
- local lb, ec = nil, nil
- local function flushwb()
- while wb:len() > 0 do
- checkCursor()
- local wl = wb:sub(1,mx-cx+1)
- wb = wb:sub(wl:len()+1)
- gpu.set(cx, cy, wl)
- cx = cx + wl:len()
- end
- end
- 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 cc in s:gmatch(".") do
- if mode == 0 then
- if cc == "\n" then
- flushwb()
- cx,cy = 1, cy+1
- elseif cc == "\t" then
- wb=wb..(" "):rep(8*((cx+9)//8))
- elseif cc == "\27" then
- flushwb()
- mode = 1
- else
- wb = wb .. cc
- end
- elseif mode == 1 then
- if cc == "[" then
- mode = 2
- else
- mode = 0
- end
- elseif mode == 2 then
- if cc:match("[%d;]") then
- cs = cs .. cc
- else
- mode = 0
- local tA = {}
- for s in cs:gmatch("%d+") do
- tA[#tA+1] = tonumber(s)
- end
- if cc == "H" then
- cx, cy = tA[1] or 1, tA[2] or 1
- elseif cc == "A" then
- cy = cy - (tA[1] or 1)
- elseif cc == "B" then
- cy = cy + (tA[1] or 1)
- elseif cc == "C" then
- cx = cx + (tA[1] or 1)
- elseif cc == "D" then
- cx = cx - (tA[1] or 1)
- elseif cc == "s" then
- sx, sy = cx, cy
- elseif cc == "u" then
- cx, cy = sx, sy
- elseif cc == "n" and tA[1] == 6 then
- rs = string.format("%s\27[%d;%dR",rs,cx,cy)
- elseif cc == "K" and tA[1] == 1 then
- gpu.fill(1,cy,cx,1," ")
- elseif cc == "K" and tA[1] == 2 then
- gpu.fill(cx,cy,mx,1," ")
- elseif cc == "K" then
- gpu.fill(1,cy,mx,1," ")
- elseif cc == "J" and tA[1] == 1 then
- gpu.fill(1,1,mx,cy," ")
- elseif cc == "J" and tA[1] == 2 then
- gpu.fill(1,1,mx,my," ")
- cx, cy = 1, 1
- elseif cc == "J" then
- gpu.fill(1,cy,mx,my," ")
- elseif cc == "m" then
- for _,num in ipairs(tA) do
- if num == 0 then
- fg,bg,ec,lb = 0xFFFFFF,0,true,true
- 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]
- elseif num == 100 then -- disable local echo
- ec = false
- elseif num == 101 then -- disable line mode
- lb = false
- end
- end
- gpu.setForeground(fg)
- gpu.setBackground(bg)
- end
- cs = ""
- checkCursor()
- end
- end
- end
- flushwb()
- checkCursor()
- pc = gpu.get(cx,cy)
- gpu.setForeground(bg)
- gpu.setBackground(fg)
- gpu.set(cx,cy,pc)
- gpu.setForeground(fg)
- gpu.setBackground(bg)
- return rs, lb, ec
- end
-
- return termwrite
- end
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