Added lume.hotswap() fn, updated version to 1.0.6

README.md

@@ -203,6 +203,15 @@ Executes the lua code inside `str`.
 lume.dostring("print('Hello!')") -- Prints "Hello!"
 ```
 
+### lume.hotswap(modname)
+Reloads an already loaded module in place; `modname` should be the same string
+used when loading the module with require(). This function can be used to
+immediatly see the effects of code changes without having to restart the
+program.
+```lua
+lume.hotswap("lume") -- Reloads the lume module
+```
+
 ### lume.rgba(color)
 Takes the 32bit integer `color` argument and returns 4 numbers, one for each
 channel, with a range of 0 - 255. Handy for using as the argument to

lume.lua

@@ -7,7 +7,7 @@
 -- under the terms of the MIT license. See LICENSE for details.
 --
 
-local lume = { _version = "1.0.5" }
+local lume = { _version = "1.0.6" }
 
 
 function lume.clamp(x, min, max)
@@ -226,6 +226,33 @@ function lume.dostring(str)
 end
 
 
+function lume.hotswap(modname)
+  local updated = {}
+  local function update(old, new)
+    if updated[old] then return end 
+    updated[old] = true
+    local oldmt, newmt = getmetatable(old), getmetatable(new)
+    if oldmt and newmt then update(oldmt, newmt) end
+    for k, v in pairs(new) do
+      if type(v) == "table" then update(old[k], v) else old[k] = v end
+    end
+  end
+  local oldglobal = lume.clone(_G)
+  local oldmod = require(modname)
+  package.loaded[modname] = nil
+  local newmod = require(modname)
+  package.loaded[modname] = oldmod
+  if type(oldmod) == "table" then update(oldmod, newmod) end
+  for k, v in pairs(oldglobal) do
+    if v ~= _G[k] and type(v) == "table" then 
+      update(v, _G[k])
+      _G[k] = v
+    end
+  end
+  return oldmod
+end
+
+
 function lume.rgba(color)
   local floor = math.floor
   local a = floor((color / 2 ^ 24) % 256)