virtual terminal support with vtansi and getty, for machines with VRAM available
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@ -1,4 +1,6 @@
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local vtansi = {}
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local keyboardIgnore = {}
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vtansi.activeBuffers = {}
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vtansi.sequences = {
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[28] = "\n", -- newline
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[200] = "\27[A", -- up
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@ -8,9 +10,26 @@ vtansi.sequences = {
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[201] = "\27[5~", -- page up
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[209] = "\27[6~" -- page down
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}
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function vtansi.vtemu(gpu) -- table -- function -- takes GPU component proxy *gpu* and returns a function to write to it in a manner like an ANSI terminal
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vtansi.keys = {}
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vtansi.keys[0x38] = "lalt"
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vtansi.keys[0xB8] = "ralt"
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function vtansi.saveToBuffer(gpu,idx)
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gpu.bitblt(idx, nil, nil, nil, nil, 0)
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end
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function vtansi.loadFromBuffer(gpu,idx)
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gpu.bitblt(0, nil, nil, nil, nil, idx)
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end
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function vtansi.switchToBuffer(gpu,idx)
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-- copy screen to the active buffer
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vtansi.saveToBuffer(gpu,vtansi.activeBuffers[gpu.address])
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-- copy the new buffer to the screen
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vtansi.loadFromBuffer(gpu,idx)
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vtansi.activeBuffers[gpu.address] = idx
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end
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function vtansi.vtemu(gpu,bn) -- table number -- function -- takes GPU component proxy *gpu* and returns a function to write to it in a manner like an ANSI terminal, either allocating a new buffer or using *bn*.
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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 buffer = nil
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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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@ -21,8 +40,19 @@ function vtansi.vtemu(gpu) -- table -- function -- takes GPU component proxy *gp
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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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if gpu.getActiveBuffer then
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buffer = bn or gpu.allocateBuffer(mx,my)
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vtansi.activeBuffers[gpu.address] = vtansi.activeBuffers[gpu.address] or buffer
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local oldActiveBuffer = vtansi.activeBuffers[gpu.address]
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gpu.setActiveBuffer(buffer)
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gpu.setResolution(mx,my)
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gpu.fill(1,1,mx,my," ")
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gpu.setActiveBuffer(oldActiveBuffer)
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else
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gpu.setResolution(mx,my)
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gpu.fill(1,1,mx,my," ")
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end
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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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@ -37,6 +67,13 @@ function vtansi.vtemu(gpu) -- table -- function -- takes GPU component proxy *gp
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end
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local function termwrite(s)
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if buffer then
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if vtansi.activeBuffers[gpu.address] == buffer then
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gpu.setActiveBuffer(0)
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else
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gpu.setActiveBuffer(buffer)
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end
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end
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local wb = ""
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local lb, ec = nil, nil
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local function flushwb()
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@ -161,13 +198,14 @@ function vtansi.vtemu(gpu) -- table -- function -- takes GPU component proxy *gp
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return rs, lb, ec
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end
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return termwrite
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return termwrite, buffer
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end
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function vtansi.vtsession(gpua,scra) -- string string -- table -- creates a process to handle the GPU and screen address combination *gpua*/*scra*. Returns read, write and "close" functions.
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function vtansi.vtsession(gpua,scra,bn) -- string string number -- function function function -- creates a process to handle the GPU and screen address combination *gpua*/*scra*, optionally using buffer number *bn* specifically. Returns read, write and "close" functions.
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local modifiers = {}
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local gpu = component.proxy(gpua)
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gpu.bind(scra)
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local write = vtansi.vtemu(gpu)
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-- gpu.bind(scra)
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local write, bn = vtansi.vtemu(gpu,bn)
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local kba = {}
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for k,v in ipairs(component.invoke(scra,"getKeyboards")) do
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kba[v]=true
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@ -176,19 +214,45 @@ function vtansi.vtsession(gpua,scra) -- string string -- table -- creates a proc
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os.spawn(function()
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while true do
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local ty,ka,ch,kc = coroutine.yield()
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if ty == "key_down" and kba[ka] then
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local outs
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if ch > 0 then
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outs = string.char(ch)
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end
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outs = vtansi.sequences[kc] or outs
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if outs then
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if echo then write(outs) end
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buf=buf..outs
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if kba[ka] and keyboardIgnore[ka] == bn then
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keyboardIgnore[ka] = nil
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end
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if kba[ka] and vtansi.keys[kc] then
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modifiers[vtansi.keys[kc]] = ty == "key_down"
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end
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if ty == "key_down" and kba[ka] and (bn == nil or vtansi.activeBuffers[gpua] == bn) then
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if bn and ty == "key_down" and kba[ka] and ch == 46 and kc == 52 and (modifiers.lalt or modifiers.ralt) then
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-- next buffer
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local allBuffers = gpu.buffers()
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for k,v in ipairs(allBuffers) do
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if v == vtansi.activeBuffers[gpu.address] and allBuffers[k+1] and not keyboardIgnore[ka] then
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keyboardIgnore[ka] = bn
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vtansi.switchToBuffer(gpu,allBuffers[k+1])
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end
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end
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elseif bn and ty == "key_down" and kba[ka] and ch == 44 and kc == 51 and (modifiers.lalt or modifiers.ralt) then
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-- previous buffer
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local allBuffers = gpu.buffers()
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for k,v in ipairs(allBuffers) do
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if v == vtansi.activeBuffers[gpu.address] and allBuffers[k-1] and not keyboardIgnore[ka] then
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keyboardIgnore[ka] = bn
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vtansi.switchToBuffer(gpu,allBuffers[k-1])
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end
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end
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else
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local outs
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if ch > 0 then
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outs = string.char(ch)
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end
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outs = vtansi.sequences[kc] or outs
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if outs then
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if echo then write(outs) end
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buf=buf..outs
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end
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end
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end
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end
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end,string.format("ttyd[%s:%s]",gpua:sub(1,8),scra:sub(1,8)))
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end,string.format("ttyd[%s:%s/%i]",gpua:sub(1,8),scra:sub(1,8),tonumber(bn) or 0))
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local function bread(n)
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coroutine.yield()
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local r = buf
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@ -37,20 +37,32 @@ local function spawnShell(fin,fout)
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io.input(fin)
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io.output(fout):setvbuf("no")
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print(_OSVERSION.." - "..tostring(math.floor(computer.totalMemory()/1024)).."K RAM")
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return os.spawn(function() local w,r = pcall(shell.interactive) if not w then syslog(r) end end, "shell: "..tostring(fin))
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print((os.getenv("HOSTNAME") or "unknown") .. " on " .. fin)
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-- return os.spawn(function() local w,r = pcall(shell.interactive) if not w then syslog(r) end end, "shell: "..tostring(fin))
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return os.spawn(shell.interactive, "shell: "..tostring(fin))
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end
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local function allocate()
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for k,v in pairs(gpus) do
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dprint(k)
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dprint("Setting up display "..k)
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local sA = nextScreen(v[2])
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if v[1] == false and sA then
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local r,w = vtansi.vtsession(k,sA)
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devfs.register("tty"..tostring(ttyn), function() return r,w,function() end end)
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local terminals = 1
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local gpu = component.proxy(k)
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gpu.bind(sA)
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if gpu.buffers then
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gpu.freeAllBuffers()
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local mw, mh = gpu.maxResolution()
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terminals = math.floor(gpu.freeMemory() / (mw * mh))
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end
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for i = 1, terminals do
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local r,w = vtansi.vtsession(k,sA)
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devfs.register("tty"..tostring(ttyn), function() return r,w,function() end end)
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pids["tty"..tostring(ttyn)] = {-1}
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ttyn = ttyn + 1
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end
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gpus[k][1] = true
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screens[sA][1] = true
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pids["tty"..tostring(ttyn)] = {-1}
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ttyn = ttyn + 1
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end
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end
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end
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@ -59,14 +71,15 @@ function start()
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basepid = os.spawn(function()
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scan()
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allocate()
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dprint("screens ready")
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dprint("Display setup complete.")
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while true do
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coroutine.yield()
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for k,v in pairs(pids) do
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if not os.taskInfo(v[1]) then
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dprint("Spawning new shell for "..k)
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pids[k][1] = spawnShell(v[2] or "/dev/"..k, v[3] or "/dev/"..k)
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pids[k][2], pids[k][3] = pids[k][2] or io.input(), pids[k][3] or io.output()
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pids[k][2], pids[k][3] = pids[k][2] or "/dev/"..k, pids[k][3] or "/dev/"..k
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coroutine.yield()
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end
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end
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end
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