get.lua

local function get_variables_hash(msg)
  if msg.to.type == 'chat' then
    return 'chat:'..msg.to.id..':variables'
  end
  if msg.to.type == 'user' then
    return 'user:'..msg.from.id..':variables'
  end
end 

local function list_variables(msg)
  local hash = get_variables_hash(msg)
  
  if hash then
    local names = redis:hkeys(hash)
    local text = ''
    for i=1, #names do
      text = text..names[i]..'\n'
    end
    return text
  end
end

local function get_value(msg, var_name)
  local hash = get_variables_hash(msg)
  if hash then
    local value = redis:hget(hash, var_name)
    if not value then
      return'Not found, use "!get" to list variables'
    else
      return var_name..' => '..value
    end
  end
end

local function run(msg, matches)
  if matches[2] then
    return get_value(msg, matches[2])
  else
    return list_variables(msg)
  end
end

return {
  description = "Retrieves variables saved with !set", 
  usage = "!get (value_name): Returns the value_name value.",
  patterns = {
    "^(!get) (.+)$",
    "^!get$"
  },
  run = run
}