forked from izaya/OC-PsychOS2
143 lines
3.5 KiB
Lua
143 lines
3.5 KiB
Lua
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 colours = {0x0,0xFF0000,0x00FF00,0xFFFF00,0x0000FF,0xFF00FF,0x00B6FF,0xFFFFFF}
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local mx, my = gpu.maxResolution()
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local cx, cy = 1, 1
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local pc = " "
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local lc = ""
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local mode = 0 -- 0 normal, 1 escape, 2 command
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local lw = true
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local sx, sy = 1,1
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local cs = ""
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local bg, fg = 0, 0xFFFFFF
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-- setup
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gpu.setResolution(mx,my)
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gpu.fill(1,1,mx,my," ")
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local function checkCursor()
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if cx > mx and lw then
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cx, cy = 1, cy+1
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end
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if cy > my then
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gpu.copy(1,2,mx,my-1,0,-1)
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gpu.fill(1,my,mx,1," ")
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cy=my
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end
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if cy < 1 then cy = 1 end
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if cx < 1 then cx = 1 end
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end
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local function termwrite(s)
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dprint("attempting termwrite")
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dprint("writing "..tostring(s))
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local wb = ""
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local function flushwb()
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dprint("flush")
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while wb:len() > 0 do
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dprint("flushing "..tostring(wb:len()).." chars: "..tostring(wb))
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checkCursor()
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local wl = wb:sub(1,mx-cx+1)
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wb = wb:sub(wl:len()+1)
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gpu.set(cx, cy, wl)
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cx = cx + wl:len()
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end
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end
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local rs = ""
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s=s:gsub("\8","\27[D")
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pc = gpu.get(cx,cy)
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gpu.setForeground(fg)
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gpu.setBackground(bg)
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gpu.set(cx,cy,pc)
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for cc in s:gmatch(".") do
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if mode == 0 then
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if string.byte(cc) > 31 and string.byte(cc) < 128 then -- probably printable
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wb = wb .. cc
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elseif cc == "\n" then
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flushwb()
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cx,cy = 1, cy+1
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elseif cc == "\t" then
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wb=wb..(" "):rep(8*((cx+9)//8))
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elseif cc == "\27" then
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flushwb()
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mode = 1
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end
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elseif mode == 1 then
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if cc == "[" then
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dprint("entering escape code mode")
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mode = 2
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else
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mode = 0
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end
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elseif mode == 2 then
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if cc:match("[%d;]") then
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cs = cs .. cc
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else
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mode = 0
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dprint("command: "..tostring(cc))
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local tA = {}
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for s in cs:gmatch("%d+") do
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tA[#tA+1] = tonumber(s)
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dprint("arg: "..tostring(s))
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end
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if cc == "H" then
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cx, cy = tA[1] or 1, tA[2] or 1
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elseif cc == "A" then
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cy = cy - (tA[1] or 1)
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elseif cc == "B" then
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cy = cy + (tA[1] or 1)
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elseif cc == "C" then
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cx = cx + (tA[1] or 1)
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elseif cc == "D" then
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cx = cx - (tA[1] or 1)
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elseif cc == "s" then
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sx, sy = cx, cy
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elseif cc == "u" then
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cx, cy = sx, sy
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elseif cc == "n" and tA[1] == 6 then
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rs = string.format("%s\27[%d;%dR",rs,cx,cy)
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elseif cc == "K" and tA[1] == 1 then
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gpu.fill(1,cy,cx,1," ")
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elseif cc == "K" and tA[1] == 2 then
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gpu.fill(cx,cy,mx,1," ")
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elseif cc == "K" then
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gpu.fill(1,cy,mx,1," ")
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elseif cc == "J" and tA[1] == 1 then
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gpu.fill(1,1,mx,cy," ")
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elseif cc == "J" and tA[1] == 2 then
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gpu.full(1,1,mx,my," ")
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cx, cy = 1, 1
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elseif cc == "J" then
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gpu.fill(1,cy,mx,my," ")
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elseif cc == "m" then
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for _,num in ipairs(tA) do
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if num == 0 then
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fg,bg = 0xFFFFFF,0
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elseif num == 7 then
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local nfg,nbg = bg, fg
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fg, bg = nfg, nbg
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elseif num > 29 and num < 38 then
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fg = colours[num-29]
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elseif num > 39 and num < 48 then
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bg = colours[num-39]
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end
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end
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gpu.setForeground(fg)
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gpu.setBackground(bg)
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end
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cs = ""
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checkCursor()
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end
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end
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end
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flushwb()
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pc = gpu.get(cx,cy)
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gpu.setForeground(bg)
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gpu.setBackground(fg)
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gpu.set(cx,cy,pc)
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gpu.setForeground(fg)
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gpu.setBackground(bg)
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return rs
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end
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return termwrite
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end
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