Adding some compatibility stuff.

files.lua

@@ -59,7 +59,7 @@ if ok then
   local raw_file_exists
   raw_file_exists = function(filename)
     local mode = lfs.attributes(filename, 'mode')
-    if mode == 'file' or mode == 'directory' then
+    if mode == 'file' or mode == 'directory' or mode == 'link' then
       return true
     else
       return false
@@ -80,15 +80,15 @@ if ok then
   end
   local browse
   browse = function(filename)
-    local file_type = lfs.attributes(filename, 'mode')
+    local file_type, err = lfs.attributes(filename, 'mode')
     if file_type == 'file' then
       if match(filename, "%.nom$") or match(filename, "%.lua$") then
         coroutine.yield(filename)
         return true
       end
-    elseif file_type == 'directory' then
+    elseif file_type == 'directory' or file_type == 'link' then
       for subfile in lfs.dir(filename) do
-        if not (subfile == "." or subfile == ".." or not subfile:match("%.nom$")) then
+        if not (subfile == "." or subfile == "..") then
           browse(filename .. "/" .. subfile)
         end
       end

files.moon

@@ -37,7 +37,7 @@ ok, lfs = pcall(require, "lfs")
 if ok
     raw_file_exists = (filename)->
         mode = lfs.attributes(filename, 'mode')
-        return if mode == 'file' or mode == 'directory' then true else false
+        return if mode == 'file' or mode == 'directory' or mode == 'link' then true else false
     files.exists = (path)->
         return true if path == 'stdin' or raw_file_exists(path)
         if package.nomsupath
@@ -46,20 +46,20 @@ if ok
         return false
     -- Return 'true' if any files or directories are found, otherwise 'false', and yield every filename
     browse = (filename)->
-        file_type = lfs.attributes(filename, 'mode')
+        file_type, err = lfs.attributes(filename, 'mode')
         if file_type == 'file'
             if match(filename, "%.nom$") or match(filename, "%.lua$")
                 coroutine.yield filename
                 return true
-        elseif file_type == 'directory'
+        elseif file_type == 'directory' or file_type == 'link'
             for subfile in lfs.dir(filename)
-                -- Only include .nom files unless directly specified
+                unless subfile == "." or subfile == ".."
-                unless subfile == "." or subfile == ".." or not subfile\match("%.nom$")
                     browse(filename.."/"..subfile)
             return true
         elseif file_type == 'char device'
             coroutine.yield(filename)
             return true
+
         return false
     files.walk = (path)->
         if match(path, "%.nom$") or match(path, "%.lua$") or path == 'stdin'

nomsu.peg

@@ -1,10 +1,14 @@
 -- Nomsu version 1
 file:
+    shebang?
     (ignored_line %nl)*
     (file_chunks / block / action / expression)?
     (%nl ignored_line)*
     (!. / (({} (.* -> "Parse error") %userdata) => error))
 
+shebang:
+    ("#!" (!"nomsu" !%nl .)* "nomsu" ((%ws* "-V" %ws* {[0-9]+ ("." [0-9]+)*}) / {''}) %ws* (%nl / !.) %userdata) => Version
+
 file_chunks (FileChunks):
     {| (block/action/expression) (nodent chunk_delimeter nodent (block/action/expression))+ |}
 chunk_delimeter: "~~~" (("~")*)

nomsu_compiler.lua

@@ -486,6 +486,14 @@ do
     return run_lua_fn()
   end
   NomsuCompiler.compile = function(self, tree)
+    if tree.version then
+      do
+        local upgrade = self['A' .. string.as_lua_id("upgrade 1 from 2")]
+        if upgrade then
+          tree = upgrade(tree, tree.version)
+        end
+      end
+    end
     local _exp_0 = tree.type
     if "Action" == _exp_0 then
       local stub = tree.stub

nomsu_compiler.moon

@@ -321,6 +321,9 @@ with NomsuCompiler
         return run_lua_fn!
 
     .compile = (tree)=>
+        if tree.version
+            if upgrade = @['A'..string.as_lua_id("upgrade 1 from 2")]
+                tree = upgrade(tree, tree.version)
         switch tree.type
             when "Action"
                 stub = tree.stub

parser.lua

@@ -97,6 +97,10 @@ do
     userdata.comments[start_pos] = value
     return true
   end
+  _with_0.Version = function(src, end_pos, version, userdata)
+    userdata.version = version
+    return true
+  end
   NOMSU_DEFS = _with_0
 end
 setmetatable(NOMSU_DEFS, {
@@ -195,6 +199,7 @@ Parser.parse = function(nomsu_code, source)
     error("Errors occurred while parsing:\n\n" .. table.concat(errors, "\n\n"), 0)
   end
   tree.comments = userdata.comments
+  tree.version = userdata.version
   return tree
 end
 return Parser

parser.moon

@@ -76,6 +76,10 @@ NOMSU_DEFS = with {}
         userdata.comments[start_pos] = value
         return true
 
+    .Version = (src,end_pos,version,userdata)->
+        userdata.version = version
+        return true
+
 setmetatable(NOMSU_DEFS, {__index:(key)=>
     make_node = (start, value, stop, userdata)->
         if userdata.source
@@ -133,6 +137,7 @@ Parser.parse = (nomsu_code, source=nil)->
         error("Errors occurred while parsing:\n\n"..table.concat(errors, "\n\n"), 0)
     
     tree.comments = userdata.comments
+    tree.version = userdata.version
     return tree
 
 return Parser