Node Control Panel

I made this a few months ago for our base (with Jon, Cran, Wiz, etc.) -- it lets you turn things in the base on/off with a GUI by right clicking the element on the screen.



You can edit the layout in-game on the monitor.



Setup information:

• You need to change the settings in npanel_conf.lua to point to a bundled cable.
• The control panel emits a pulse to toggle an external latch. I did this because latches retain their state immediately on chunk load.
• Put a MiscPeripherals note block adjacent to have it play a sound.
• You must put a lever or some redstone current to a side of the CC computer to have the screen turn on.
• Run npanel.lua.

[h2]npanel.conf[/h2]

Code:

--[[
  Node Panel Display
  by sk89q
]]--
 
dofile("npanel_conf.lua")
dofile("serpent.lua")
dofile("util.lua")
 
local function validateColor(allowNone)
  return function(input)
    if allowNone and input == "" then return nil end
    if not colors[input] then
      return "Invalid color! Examples: red, blue, black, lightBlue, etc."
    end
  end
end
 
local Block = prototype({
  __construct = function(self, x, y, text, color)
    self.x = x
    self.y = y
    self.text = text
    self.color = color or colors.lightBlue
    self.conn = {}
    self.cable = nil
    self.state = nil
    self:setText(text)
  end,
 
  setText = function(self, text)
    self.text = text
 
    -- calculate width of the block
    self._width = #self.text + 1
    if self._width % 2 ~= 0 then
      self._width = self._width + 1
    end
  end,
 
  onClick = function(self)
    if self.cable then -- bundled cable
      -- toggle the latch (external to the system)
      self.state = not self.state
      redstone.setBundledOutput(bundledSide, self.cable)
      os.sleep(0.2)
      redstone.setBundledOutput(bundledSide, 0)
      return "Toggled " .. self.text .. " to " .. (self.state and "ON" or "OFF")
    else
      return false
    end
  end,
 
  contains = function(self, x, y)
    return x >= -self._width / 2 + self.x and x <= self._width / 2 + self.x and
        y >= self.y - 1 and y <= self.y + 1
  end,
 
  connect = function(self, to, color)
    local color = color or colors.white
    table.insert(self.conn, {to = to, color = color})
    table.insert(to.conn, {to = self, color = color})
  end,
 
  disconnect = function(self, to)
    for k, other in ipairs(self.conn) do
      if other.to == to then
        -- remove own connection
        table.remove(self.conn, k)
 
        -- remove the other's reference too
        for k, other in ipairs(to.conn) do
          if other.to == self then
            table.remove(to.conn, k)
            break
          end
        end
 
        return -- exit
      end
    end
  end,
 
  disconnectAll = function(self)
    for _, other in ipairs(self.conn) do
      -- remove the other's reference
      for k, o in ipairs(other.to.conn) do
        if o.to == self then
          table.remove(other.to.conn, k)
          break
        end
      end
    end
 
    self.conn = {}
  end,
 
  isConnected = function(self, to)
    for k, other in ipairs(self.conn) do
      if other.to == to then return true end
    end
    return false
  end,
 
  setCable = function(self, color)
    self.cable = color
    -- set the state field if only we have a color set
    if color then
      self.state = self.state or false
    else
      self.state = nil
    end
    return self
  end,
 
  apply = function(self, object)
    prototyptify(self, object)
  end,
 
  draw = function(self)
    term.setBackgroundColor(self._selected and colors.blue or self.color)
    term.setTextColor(colors.white)
 
    drawLine(-self._width / 2 + self.x + 1, self.y - 1, self._width / 2 + self.x - 1, self.y - 1, "-")
    drawLine(-self._width / 2 + self.x + 1, self.y + 1, self._width / 2 + self.x - 1, self.y + 1, "-")
    drawPixel(-self._width / 2 + self.x, self.y - 1, "+")
    drawPixel(self._width / 2 + self.x, self.y - 1, "+")
    drawPixel(-self._width / 2 + self.x, self.y + 1, "+")
    drawPixel(self._width / 2 + self.x, self.y + 1, "+")
    drawPixel(-self._width / 2 + self.x, self.y, "|")
    drawPixel(self._width / 2 + self.x, self.y, "|")
    term.setCursorPos(-self._width / 2 + self.x + 1, self.y)
    term.write(self.text)
 
    for i = 0, self._width - #self.text - 2 do
      term.write(" ")
    end
 
    -- draw state
    if self.state ~= nil then
      term.setCursorPos(-self._width / 2 + self.x + 1, self.y - 1)
      if self.state then
        term.setBackgroundColor(colors.green)
        term.setTextColor(colors.yellow)
        term.write("ON")
      else
        term.setBackgroundColor(colors.red)
        term.setTextColor(colors.yellow)
        term.write("OFF")
      end
    end
  end
})
 
local Diagram = prototype({
  __construct = function(self)
    self.blocks = {}
    self.seen = {}
  end,
 
  add = function(self, block)
    -- only add if we haven't seen this block
    if not self.seen[block] then
      self.seen[block] = true
      table.insert(self.blocks, block)
 
      for _, c in ipairs(block.conn) do
        self:add(c.to) -- add this block too
      end
    end
  end,
 
  remove = function(self, block)
    self.seen[block] = nil
    -- remove from self.blocks
    for k, v in ipairs(self.blocks) do
      if v == block then
        table.remove(self.blocks, k)
        return
      end
    end
  end,
 
  save = function(self, path)
    local data = serpent.dump(self.blocks, {
      valtypeignore = {["function"] = true},
      compact = true
    })
    -- save to file
    local f = fs.open(path, "w")
    f.write(data)
    f.close()
  end,
 
  load = function(self, path)
    -- save to file
    local f = fs.open(path, "r")
    if f then
      local data = f.readAll()
      f.close()
      self.blocks = loadstring(data)()
      -- need to re-initialize
      for _, block in ipairs(self.blocks) do
        Block:apply(block)
      end
    else -- no data to load then
      self.blocks = {}
    end
  end,
 
  intersect = function(self, x, y, seen, block)
    for _, block in ipairs(self.blocks) do
      if block:contains(x, y) then
        return block
      end
    end
  end
})
 
local BasePane = prototype({
  titleColor = colors.cyan,
 
  __construct = function(self, app)
    self.app = app
  end,
 
  readInput = function(self, name, validate)
    local input
    self:drawHint("Please type the input above")
 
    while true do
      self:drawStatus(name)
      redstone.setOutput(enableSide, true)
      input = trim(read())
      redstone.setOutput(enableSide, false)
      if type(validate) == 'function' then
        local msg = validate(input)
        if msg then -- uh oh, error!
          self:drawHint(msg)
        else
          break -- ok
        end
      elseif validate then -- just verify non-blank
        if msg == "" then
          self:drawHint("Non-empty string required")
        else
          break -- ok
        end
      else
        break -- no validation needed
      end
    end
 
    -- ok!
    self:drawHint("")
    return input
  end,
 
  drawStatus = function(self, status)
    local w, h = term.getSize()
    drawLine(1, h - 1, w, h - 1, " ", colors.black)
    drawText(2, h - 1, status, colors.black, colors.yellow)
  end,
 
  drawHint = function(self, status)
    local w, h = term.getSize()
    drawLine(1, h, w, h, " ", self.titleColor)
    drawText(2, h, status, self.titleColor, colors.white)
  end,
 
  drawTitle = function(self, title)
    drawText(2, 1, " " .. title .. " ", self.titleColor, colors.white)
  end,
 
  drawDiagram = function(self)
    self:drawConnections()
    self:drawBlocks()
  end,
 
  drawBlocks = function(self)
    for _, block in ipairs(self.app.diagram.blocks) do
      block:draw()
    end
  end,
 
  drawConnection = function(self, x1, y1, x2, y2, color)
    drawLine(x1, y1, x2, y2, x1 == x2 and "|" or "-", color, colors.black)
  end,
 
  drawConnections = function(self)
    for _, block in ipairs(self.app.diagram.blocks) do
      for k, v in ipairs(block.conn) do
        self:drawConnection(block.x, block.y, v.to.x, v.to.y, v.color)
      end
    end
  end,
 
  draw = function(self)
    -- do nothing
  end,
 
  onPress = function(self, key)
    -- do nothing
  end,
 
  onClick = function(self, button, x, y)
    -- do nothing
  end,
 
  onDrag = function(self, button, x, y)
    -- do nothing
  end,
})
 
local Display = prototype(BasePane, {
  draw = function(self)
    self.app:drawAll(function()
      local w, h = term.getSize()
      term.setBackgroundColor(colors.black)
      term.clear()
      self:drawTitle("SYSTEM OVERVIEW")
      self:drawStatus("Touch elements to toggle them off and on")
      self:drawHint("[E]dit Mode")
      self:drawDiagram()
    end)
  end,
 
  onPress = function(self, key)
    if key:lower() == "e" then
      self.app:show(self.app.editor)
    end
  end,
 
  onClick = function(self, button, x, y)
    local clicked = self.app.diagram:intersect(x, y)
    if clicked then
      local status = clicked:onClick()
      if status then
        self.app:drawAll(function()
          clicked:draw()
          self:drawStatus(status)
          self.app:save() -- better save state
        end)
        self.app.notebox.playNote(3, 24)
      end
    end
  end,
})
 
local Editor = prototype(BasePane, {
  titleColor = colors.red,
  selected = nil,
  lastSelected = nil,
 
  draw = function(self)
    self.app:drawAll(function()
      local w, h = term.getSize()
      term.setBackgroundColor(colors.black)
      term.clear()
      self:drawTitle("BLOCK EDITOR")
      self:drawStatusBar()
      self:drawDiagram()
    end)
  end,
 
  drawStatusBar = function(self)
    if self.selected then
      self:drawHint("[I]nsert [D]elete [M]odify [C]onnect [S]ave")
    else
      self:drawHint("[I]nsert [S]ave")
    end
  end,
 
  select = function(self, block)
    -- swap selection
    local last = nil
    if self.selected then
      self.selected._selected = false
      last = self.selected
    end
    self.selected = block
    if block then
      block._selected = true
    end
    self.lastSelected = last
    return last
  end,
 
  onClick = function(self, button, x, y)
    local clicked = self.app.diagram:intersect(x, y)
    if clicked then
      local last = self:select(clicked)
      -- redraw
      self.app:drawAll(function()
        clicked:draw()
        if last then
          last:draw() -- unselected the last one, so redraw
        end
        self:drawStatus(clicked.text .. " selected" ..
          (clicked.cable and (" [color: " .. getColor(clicked.cable) .. "]") or ""))
        self:drawStatusBar()
      end)
    end
  end,
 
  onDrag = function(self, button, x, y)
    if self.selected then
      if x ~= self.selected.x or y ~= self.selected.y then
        self.selected.x = x
        self.selected.y = y
        self:draw()
      end
    end
  end,
 
  onPress = function(self, key)
    local lkey = key:lower()
    -- save/quit
    if lkey == "s" then
      self:select(nil)
      self.app:show(self.app.display)
      self.app:save()
    -- insert
    elseif lkey == "i" then
      local x, y = 2, 2
      local name = self:readInput("Name: ", true) -- just non-blank
      local block = Block(x, y, name)
      self.app.diagram:add(block)
      self:select(block)
      self:draw() -- redraw all
    -- connect
    elseif lkey == "c" and self.selected then -- only if selected
      if self.lastSelected == self.selected then
        self:drawHint("Can't connect to itself, silly")
      elseif self.lastSelected then
        if self.selected:isConnected(self.lastSelected) then -- disconnect
          self.selected:disconnect(self.lastSelected, color)
        else -- connect
          local color = colors[self:readInput("Color: ", validateColor())]
          self.selected:connect(self.lastSelected, color)
        end
        self:draw() -- redraw all
      else
        self:drawHint("Select two blocks in sequence first")
      end
    -- delete
    elseif lkey == "d" and self.selected then -- only if selected
      local confirm = self:readInput("Are you sure? [y/n] ")
      if confirm:lower() == "y" then
        self.selected:disconnectAll()
        self.app.diagram:remove(self.selected)
        self:select(nil)
      end
      self:draw()
    -- modify
    elseif lkey == "m" and self.selected then -- only if selected
      -- set name
      local name = self:readInput("Name [blank for no change]: ")
      if name ~= "" then
        self.selected:setText(name)
      end
      -- bundled cable
      local color = colors[self:readInput(
        "Bundled cable [blank for none] color: ",
        validateColor(true))] -- allow none
      self.selected:setCable(color)
      self:draw() -- redraw all
    end
  end,
})
 
local Application = prototype({
  __construct = function(self)
    self.diagram = Diagram()
    self.notebox = peripheral.wrap(noteboxSide)
    self.terminals = { peripheral.wrap("top"), term.native }
 
    self:load()
 
    self.display = Display(self)
    self.editor = Editor(self)
  end,
 
  load = function(self)
    self.diagram:load(diagramFile)
  end,
 
  save = function(self)
    self.diagram:save(diagramFile)
  end,
 
  drawExternal = function(self, func)
    for _, m in ipairs(self.terminals) do
      if m ~= term.native then -- ignore native
        term.redirect(m)
        func()
      end
    end
    term.redirect(term.native)
  end,
 
  drawAll = function(self, func)
    local enabled = self:isEnabled() -- only draw if enabled
    for _, m in ipairs(self.terminals) do
      if m == term.native or enabled then
        term.redirect(m)
        func()
      end
    end
    term.redirect(term.native)
  end,
 
  show = function(self, view)
    self.view = view
    self.view:draw()
  end,
 
  isEnabled = function(self)
    return redstone.getInput(enableSide)
  end,
 
  processEvents = function(self)
    local active = true
    local wasOn = self:isEnabled()
    self:show(self.display)
 
    -- clear on start if needed
    if not wasOn then
      self:drawExternal(function()
        term.setBackgroundColor(colors.black)
        term.clear()
      end)
    end
 
    while active do
      local id, p1, p2, p3 = os.pullEvent()
      local on = self:isEnabled()
      if id == "redstone" then
        if wasOn ~= on then
          wasOn = on
          self:drawExternal(function()
            -- redraw if turned on
            if on then
              self.view:draw()
            else
              -- clear when off
              term.setBackgroundColor(colors.black)
              term.clear()
            end
          end)
        end
      elseif id == "key" then
        local key = p1
        if key == 221 then
          active = false
        end
      elseif id == "char" then
        local ch = p1
        self.view:onPress(ch)
      elseif id == "mouse_click" then
        local button, x, y = p1, p2, p3
        self.view:onClick(button, x, y)
      elseif id == "mouse_drag" then
        local button, x, y = p1, p2, p3
        self.view:onDrag(button, x, y)
      elseif id == "monitor_touch" and on then -- only if on!
        local side, x, y = p1, p2, p3
        self.view:onClick(0, x, y)
      end
    end
 
    self:drawAll(function()
      term.setBackgroundColor(colors.black)
      term.setTextColor(colors.white)
      term.clear()
      term.setCursorPos(1, 1)
      print("Node Panel exited")
    end)
  end,
 
  loadExample = function(self)
    local boiler = Block(25, 14, "Boiler"):setCable(colors.red)
    local engines = Block(10, 6, "Engines"):setCable(colors.white)
    local refinery = Block(10, 14, "Refinery"):setCable(colors.black)
    local mjStore = Block(25, 6, "MJ Store")
    local euStore = Block(40, 6, "EU Store")
    local factory = Block(40, 14, "Factory")
 
    boiler:connect(mjStore, colors.orange)
    engines:connect(mjStore, colors.orange)
    refinery:connect(engines, colors.yellow)
    mjStore:connect(euStore, colors.purple)
    euStore:connect(factory, colors.purple)
 
    self.diagram:add(boiler)
  end
})
 
local app = Application()
app:processEvents()

[h2]npanel_conf.lua[/h2]

Code:

bundledSide = "bottom"
noteboxSide = "right"
diagramFile = "layout.txt"
enableSide = "back"

[h2]util.lua[/h2]

Code:

function prototype(parent, t)
  if not t then
    t = parent
    parent = nil
  end -- when there is no inheritance
  local t = t or {}
  local mt = { __index = t }
  setmetatable(t, {
    __call = function(_, ...)
      local obj = setmetatable({}, mt)
      if obj.__construct then obj:__construct(unpack(arg)) end
      return obj
    end,
    __index = parent
  })
  return t
end
 
function prototyptify(cls, obj)
  local mt = {}
  mt.__index = cls
  setmetatable(obj, mt)
  return obj
end
 
function drawPixel(xPos, yPos, text)
  term.setCursorPos(xPos, yPos)
  term.write(text or " ")
end
 
-- from ComputerCraft
function drawLine(startX, startY, endX, endY, text, bgColor, textColor)
  if bgColor then term.setBackgroundColor(bgColor) end
  if textColor then term.setTextColor(textColor) end
 
  startX = math.floor(startX)
  startY = math.floor(startY)
  endX = math.floor(endX)
  endY = math.floor(endY)
 
  if startX == endX and startY == endY then
    drawPixel(startX, startY, text)
    return
  end
 
  local minX = math.min(startX, endX)
  if minX == startX then
    minY = startY
    maxX = endX
    maxY = endY
  else
    minY = endY
    maxX = startX
    maxY = startY
  end
 
  local xDiff = maxX - minX
  local yDiff = maxY - minY
 
  if xDiff > math.abs(yDiff) then
    local y = minY
    local dy = yDiff / xDiff
    for x=minX,maxX do
      drawPixel(x, math.floor(y + 0.5), text)
      y = y + dy
    end
  else
    local x = minX
    local dx = xDiff / yDiff
    if maxY >= minY then
      for y=minY,maxY do
        drawPixel(math.floor(x + 0.5), y, text)
        x = x + dx
      end
    else
      for y=minY,maxY,-1 do
        drawPixel(math.floor(x + 0.5), y, text)
        x = x - dx
      end
    end
  end
end
 
function drawText(x, y, text, bgColor, textColor)
  term.setCursorPos(x, y)
  term.setBackgroundColor(bgColor or colors.black)
  term.setTextColor(textColor or colors.black)
  term.write(text)
end
 
function getColor(num)
  for k, v in pairs(colors) do
    if v == num then
      return k
    end
  end
  return "?"
end
 
function trim(s)
  return s:match"^%s*(.*)":match"(.-)%s*$"
end
 

[h2]serpent.lua[/h2]

Code:

local n, v = "serpent", 0.22 -- (C) 2012 Paul Kulchenko; MIT License
local c, d = "Paul Kulchenko", "Serializer and pretty printer of Lua data types"
local snum = {[tostring(1/0)]='1/0 --[[math.huge]]',[tostring(-1/0)]='-1/0 --[[-math.huge]]',[tostring(0/0)]='0/0'}
local badtype = {thread = true, userdata = true}
local keyword, globals, G = {}, {}, (_G or _ENV)
for _,k in ipairs({'and', 'break', 'do', 'else', 'elseif', 'end', 'false',
    'for', 'function', 'goto', 'if', 'in', 'local', 'nil', 'not', 'or', 'repeat',
    'return', 'then', 'true', 'until', 'while'}) do keyword[k] = true end
for k,v in pairs(G) do globals[v] = k end -- build func to name mapping
for _,g in ipairs({'coroutine', 'io', 'math', 'string', 'table', 'os'}) do
    for k,v in pairs(G[g]) do globals[v] = g..'.'..k end end
 
local function s(t, opts)
    local name, indent, fatal = opts.name, opts.indent, opts.fatal
    local sparse, custom, huge = opts.sparse, opts.custom, not opts.nohuge
    local space, maxl = (opts.compact and '' or ' '), (opts.maxlevel or math.huge)
    local comm = opts.comment and (tonumber(opts.comment) or math.huge)
    local seen, sref, syms, symn = {}, {}, {}, 0
 
local function gensym(val) return (tostring(val):gsub("[^%w]",""):gsub("(%d%w+)",
        function(s) if not syms[s] then symn = symn+1; syms[s] = symn end return syms[s] end)) end
 
local function safestr(s) return type(s) == "number" and (huge and snum[tostring(s)] or s)
        or type(s) ~= "string" and tostring(s) -- escape NEWLINE/010 and EOF/026
        or ("%q"):format(s):gsub("\010","n"):gsub("\026","\\026") end
 
local function comment(s,l) return comm and (l or 0) < comm and ' --[['..tostring(s)..']]' or '' end
 
local function globerr(s,l) return globals[s] and globals[s]..comment(s,l) or not fatal
        and safestr(select(2, pcall(tostring, s))) or error("Can't serialize "..tostring(s)) end
 
local function safename(path, name) -- generates foo.bar, foo[3], or foo['b a r']
        local n = name == nil and '' or name
        local plain = type(n) == "string" and n:match("^[%l%u_][%w_]*$") and not keyword[n]
        local safe = plain and n or '['..safestr(n)..']'
        return (path or '')..(plain and path and '.' or '')..safe, safe end
 
local alphanumsort = type(opts.sortkeys) == 'function' and opts.sortkeys or function(o, n)
        local maxn, to = tonumber(n) or 12, {number = 'a', string = 'b'}
        local function padnum(d) return ("%0"..maxn.."d"):format(d) end
        table.sort(o, function(a,b)
            return (o[a] and 0 or to[type(a)] or 'z')..(tostring(a):gsub("%d+",padnum))
                    < (o[b] and 0 or to[type(b)] or 'z')..(tostring(b):gsub("%d+",padnum)) end) end
 
local function val2str(t, name, indent, insref, path, plainindex, level)
        local ttype, level = type(t), (level or 0)
        local spath, sname = safename(path, name)
        local tag = plainindex and
            ((type(name) == "number") and '' or name..space..'='..space) or
            (name ~= nil and sname..space..'='..space or '')
 
if seen[t] then -- if already seen and in sref processing,
            if insref then return tag..seen[t] end -- then emit right away
            table.insert(sref, spath..space..'='..space..seen[t])
            return tag..'nil'..comment('ref', level)
        elseif badtype[ttype] then
            seen[t] = spath
            return tag..globerr(t, level)
        elseif ttype == 'function' then
            seen[t] = insref or spath
            local ok, res = pcall(string.dump, t)
            local func = ok and ((opts.nocode and "function() --[[..skipped..]] end" or
                "loadstring("..safestr(res)..",'@serialized')")..comment(t, level))
            return tag..(func or globerr(t, level))
        elseif ttype == "table" then
            if level >= maxl then return tag..'{}'..comment('max', level) end
            seen[t] = insref or spath -- set path to use as reference
            if getmetatable(t) and getmetatable(t).__tostring
                then return tag..val2str(tostring(t),nil,indent,false,nil,nil,level+1)..comment("meta", level) end
            if next(t) == nil then return tag..'{}'..comment(t, level) end -- table empty
            local maxn, o, out = #t, {}, {}
            for key = 1, maxn do table.insert(o, key) end
            for key in pairs(t) do if not o[key] then table.insert(o, key) end end
            if opts.sortkeys then alphanumsort(o, opts.sortkeys) end
            for n, key in ipairs(o) do
                local value, ktype, plainindex = t[key], type(key), n <= maxn and not sparse
                if opts.valignore and opts.valignore[value] -- skip ignored values; do nothing
                or opts.keyallow and not opts.keyallow[key]
                or opts.keynounderscore and type(key) == "string" and string.sub(key, 1, 1) == "_"
                or opts.valtypeignore and opts.valtypeignore[type(value)] -- skipping ignored value types
                or sparse and value == nil then -- skipping nils; do nothing
                elseif ktype == 'table' or ktype == 'function' or badtype[ktype] then
                    if not seen[key] and not globals[key] then
                        table.insert(sref, 'placeholder')
                        sref[#sref] = 'local '..val2str(key,gensym(key),indent,gensym(key)) end
                    table.insert(sref, 'placeholder')
                    local path = seen[t]..'['..(seen[key] or globals[key] or gensym(key))..']'
                    sref[#sref] = path..space..'='..space..(seen[value] or val2str(value,nil,indent,path))
                else
                    table.insert(out,val2str(value,key,indent,insref,seen[t],plainindex,level+1))
                end
            end
            local prefix = string.rep(indent or '', level)
            local head = indent and '{\n'..prefix..indent or '{'
            local body = table.concat(out, ','..(indent and '\n'..prefix..indent or space))
            local tail = indent and "\n"..prefix..'}' or '}'
            return (custom and custom(tag,head,body,tail) or tag..head..body..tail)..comment(t, level)
        else return tag..safestr(t) end -- handle all other types
    end
 
    local sepr = indent and "\n" or ";"..space
    local body = val2str(t, name, indent) -- this call also populates sref
    local tail = #sref>0 and table.concat(sref, sepr)..sepr or ''
 
    return not name and body or "do local "..body..sepr..tail.."return "..name..sepr.."end"
end
 
local function merge(a, b) if b then for k,v in pairs(b) do a[k] = v end end; return a; end
serpent = { _NAME = n, _COPYRIGHT = c, _DESCRIPTION = d, _VERSION = v, serialize = s,
    dump = function(a, opts) return s(a, merge({name = '_', compact = true, sparse = true}, opts)) end,
    line = function(a, opts) return s(a, merge({sortkeys = true, comment = true}, opts)) end,
    block = function(a, opts) return s(a, merge({indent = '    ', sortkeys = true, comment = true}, opts)) end }