hid-terminal.lua

-- hid-terminal.lua
-- requires keycodes lib

-- enter text to the norns screen - upper and lower case text 

local keyb = hid.connect()

local keycodes = require 'keycodes'

local wordarray ={}
local keyinput = ""
local keyoutput = ""
local start_y = 10
local shift = false;

function init()
    screen.aa(1)
    --tab.print(keyb)
    tab.print(hid.devices)
    --tab.print(hid.devices[keyb.index])
    --print(keyb.index .." " ..hid.devices[keyb.index].name)
    --tab.print(hid.devices[4].ports)
    redraw()
end

function draw_firstscreen()
  --screen.clear()
  screen.level(15)
  screen.line_width(1)
  screen.font_face(0)
  screen.font_size(8)
  screen.move(10,10)
  screen.text("NORNS> ")
  screen.update()
end
    
function textwrap(s, w, offset, prefix)
  local len =  string.len(s)
  --print (len)
  local strstore = {}
  local k = 1
    if len == 0 then
      screen.text(prefix)
    else 
      while k <= len do
        table.insert(strstore, string.sub(s, k, k+w-1))
        k = k + w
      end
      strposition = start_y + offset
      for v in pairs(strstore) do
        screen.text(prefix .. strstore[v])
        screen.move(0, strposition)
        strposition = strposition + offset
      end 
    end 
end

function get_key(code, val, shift)
  --print(shift)
  if keycodes.keys[code] ~= nil and val == 1 then 
    if (shift) then
      return(keycodes.keys[code])
    else
      return(lowercase(keycodes.keys[code]))
    end
  end 
  
end 

function keyb.event(typ, code, val)
    --print("hid.event ", typ, code, val)
    if (code == hid.codes.KEY_LEFTSHIFT) and (val == 2) then
      shift = true;
    elseif (code == hid.codes.KEY_LEFTSHIFT) and (val == 0) then
      shift = false;
    end
    
    keyinput = get_key(code, val, shift)
    buildword()
end

function lowercase(str)
   return string.lower(str)
end

function buildword()
    if keyinput ~= "Enter" then
        table.insert(wordarray,keyinput)
        keyoutput = table.concat(wordarray )
        redraw()
    else
        redraw()
        keyoutput = ""
        wordarray = {}
    end
end
    
-- screen redraw function
function redraw()
  -- clear screen
  screen.clear()
  -- set pixel brightness (0-15)
  screen.level(15)
  screen.line_width(1)
  screen.font_face(0)
  screen.font_size(8)

  screen.move(0,10)
  textwrap(keyoutput, 15, 10, "NORNS> ")
  
  screen.update()
end