fix critical timer typo and make timer work

src/lib/timer.lua

@@ -1,7 +1,7 @@
 local is_callable = function(callback)
   local _type = type(callback)
   if _type == "function" then return true end
-  of _type == "table" then
+  if _type == "table" then
     local metatable = getmetatable(callback)
     return (type(metatable) == "table") and (type(metatable.__call) == "function")
   end
@@ -49,6 +49,7 @@ local new_timer = function(callback, update, ...)
 end
 
 return {
+  version = "v1.0.0-modified",
   after = function(deadline, callback, ...)
     local timer = new_timer(callback, update_after, ...)
     timer.deadline = deadline

src/main.lua

@@ -1,15 +1,23 @@
-local utility = require "lib.utility"
 local progress_bar = require "lib.progress_bar"
+local timer = require "lib.timer"
+local utility = require "lib.utility"
 
 -- test progress_bar
 local window_width, window_height = love.graphics.getDimensions()
 local progress_bar_height = 30 -- TODO should not be hardcoded
-local test = progress_bar(0, window_height - progress_bar_height, window_width, progress_bar_height)
+local test_bar = progress_bar(0, window_height - progress_bar_height, window_width, progress_bar_height)
-test:set_text("This is a test text string of significant length. It exists to test printing over a progress bar.")
+test_bar:set_text("This is a test text string of significant length. It exists to test printing over a progress bar.")
-test:set_progress(math.random())
+-- test:set_progress(math.random())
+
+local test_timer = timer.every(1, function() end) -- TODO consider making timer not need a function; cause I don't here!
+
+love.update = function(dt)
+  timer.update(dt)
+  test_bar:set_progress(test_timer.run_time)
+end
 
 love.draw = function()
-  test:draw()
+  test_bar:draw()
 end
 
 love.keypressed = function(key)