make helper to make sure right moonscript code is tested, add to lang spec

spec/helpers.moon

@@ -6,4 +6,37 @@ unindent = (str) ->
   return str unless indent
   (str\gsub("\n#{indent}", "\n")\gsub "%s+$", "")
 
-{ :unindent }
+in_dev = false
+
+-- this will ensure any moonscript modules included come from the local
+-- directory
+with_dev = (fn) ->
+  error "already in dev mode" if in_dev
+
+  -- a package loader that only looks in currect directory
+  import make_loader from require "loadkit"
+  loader = make_loader "lua", nil, "./?.lua"
+
+  import setup, teardown from require "busted"
+
+  old_require = _G.require
+  dev_cache = {}
+
+  setup ->
+    _G.require = (mod) ->
+      return dev_cache[mod] if dev_cache[mod]
+
+      if mod\match("moonscript%.") or mod == "moonscript"
+        dev_cache[mod] = assert(loadfile(assert loader mod))!
+        return dev_cache[mod]
+
+      old_require mod
+
+    if fn
+      fn!
+
+  teardown ->
+    _G.require = old_require
+    in_dev = false
+
+{ :unindent, :with_dev }

spec/lang_spec.moon

@@ -1,12 +1,10 @@
 lfs = require "lfs"
 
-parse   = require "moonscript.parse"
-compile = require "moonscript.compile"
-util    = require "moonscript.util"
+import with_dev from require "spec.helpers"
 
 pattern = ...
 
-import unpack from util
+unpack = table.unpack or unpack
 
 options = {
   in_dir: "spec/inputs",
@@ -20,7 +18,7 @@ options = {
     tool: "git diff --no-index --color" --color-words"
     filter: (str) ->
       -- strip the first four lines
-      table.concat [line for line in *util.split(str, "\n")[5,]], "\n"
+      table.concat [l for l in *([line for line in str\gmatch("[^\n]+")])[5,]], "\n"
   }
 }
 
@@ -81,13 +79,19 @@ input_fname = (base) ->
 output_fname = (base) ->
   options.out_dir .. "/" .. base .. options.output_ext
 
-describe "input tests", ->
 inputs = for file in lfs.dir options.in_dir
   with match = file\match options.input_pattern
     continue unless match
 
 table.sort inputs
 
+describe "input tests", ->
+  local parse, compile
+
+  with_dev ->
+    parse = require "moonscript.parse"
+    compile = require "moonscript.compile"
+  
   for name in *inputs
     input = input_fname name
     it input .. " #input", ->