start work on a livedisk

init.lua should run correctly in the absence of any other file (except a user-created /etc/init.lua), so things like the terminal and lua repl will come with the livedisk instead

build.lua

@@ -158,7 +158,16 @@ end
 fs.makeDirectory(outdir)
 exportFile('boot.lua')
 
-fs.makeDirectory(outdir .. 'kitn-core/')
-exportFile('src/init.lua', outdir .. 'kitn-core/init.lua')
+fs.makeDirectory(outdir .. 'core/')
+exportFile('src/init.lua', outdir .. 'core/init.lua')
+fs.makeDirectory(outdir .. 'core/bin')
+exportFile('src/bin/tty.lua', outdir .. 'core/bin/tty.lua')
+
+fs.makeDirectory(outdir .. 'livedisk/')
+assert(fs.copy(outdir .. 'core/init.lua', outdir .. 'livedisk/init.lua'))
+fs.makeDirectory(outdir .. 'livedisk/bin/')
+assert(fs.copy(outdir .. 'core/bin/tty.lua', outdir .. 'livedisk/bin/tty.lua'))
+fs.makeDirectory(outdir .. 'livedisk/etc/')
+exportFile('src/livedisk/init.lua', outdir .. 'livedisk/etc/init.lua')
 
 -- vi: set ts=2:

src/bin/tty.lua

@@ -0,0 +1,72 @@
+local gpu, screen = ...
+checkArg(1, gpu, 'string')
+checkArg(2, screen, 'string')
+
+local keyboards = component.invoke(screen, 'getKeyboards')
+local function isAttachedKeyboard(address)
+	checkArg(1, address, 'string')
+	for i, kb in ipairs(keyboards) do
+		if kb == address then
+			return i
+		end
+	end
+	return false
+end
+
+gpu = component.proxy(gpu)
+gpu.bind(screen)
+gpu.setForeground(0xffffff)
+gpu.setBackground(0x000000)
+local w, h = gpu.getResolution()
+gpu.fill(1, 1, w, h, ' ')
+gpu.set(1, 1, string.format('%s // %s', _VERSION, _OSVERSION))
+
+
+local cmd, x, y = '', 1, 2
+
+local function onKey(ch, code)
+	gpu.bind(screen)
+	if code == 14 then --backspace
+		if cmd == '' then return end
+		local last = cmd:sub(-1)
+		local widthLast = unicode.charWidth(last)
+		gpu.fill(x - widthLast, y, widthLast, 1, ' ')
+		x = x - widthLast
+		cmd = cmd:sub(1, -2)
+	elseif code == 28 then --enter
+		gpu.set(1, y + 1, '> ')
+		gpu.set(3, y + 1, cmd)
+		cmd = ''
+		x, y = 1, y + 2
+	else
+		ch = unicode.char(ch)
+		gpu.set(x, y, ch)
+		cmd = cmd .. ch
+		x = x + unicode.charWidth(ch)
+	end
+end
+
+local function tick(signal, addr, ...)
+	if signal == 'component_removed' then
+		if addr == screen then
+			return --screen went away, exit
+		elseif (...) == 'keyboard' then
+			--intentionally don't call getKeyboards here; if the screen was removed at the same time but the keyboard's
+			--component_removed signal was delivered first, invoking a method on the screen will crash
+			local idx = isAttachedKeyboard(addr)
+			if idx then table.remove(keyboards, idx) end
+		end
+	elseif signal == 'component_added' then
+		if (...) == 'keyboard' then
+			keyboards = component.invoke(screen, 'getKeyboards')
+		end
+	elseif signal == 'key_down' and isAttachedKeyboard(addr) then
+		onKey(...)
+	end
+
+	return tick(computer.pullSignal())
+end
+
+return tick(computer.pullSignal())
+
+-- vi: set ts=2:

src/livedisk/init.lua

@@ -0,0 +1,28 @@
+--/etc/init.lua for the kitn livedisk and installer
+
+--find highest-tier gpu available
+local bestGpu, bestMem
+for addr in component.list('gpu') do
+	local mem = component.invoke(addr, 'totalMemory')
+	if mem > (bestMem or 0) then
+		bestGpu, bestMem = addr, mem
+	end
+end
+
+assert(bestGpu, 'please install a gpu or apu to continue')
+
+for screen in component.list('screen') do
+	local proc, err = kitn.createProcess('/bin/tty.lua', bestGpu, screen)
+	if not proc then error('spawn for ' .. screen:sub(1, 4) .. ' failed: ' .. err) end
+end
+
+local function tick(signal, addr, ty)
+	if signal == 'component_added' and ty == 'screen' then
+		local proc, err = kitn.createProcess('/bin/tty.lua', bestGpu, addr)
+		if not proc then error('spawn for ' .. screen:sub(1, 4) .. ' failed: ' .. err) end
+	end
+
+	return tick(computer.pullSignal())
+end
+
+return tick(computer.pullSignal())