Clarified ScriptExtensions list; require full package names.

Closes GH-45.

doc/manual.asciidoc

@@ -648,14 +648,17 @@ are supported:
 
 === Syntax Extensions ===
 
-Tundra provides a small set of syntax extensions by default.
+Tundra provides a small set of syntax extensions by default. To use syntax
+extensions, add a SyntaxExtensions list to the `tundra.lua` file specifying the
+extensions you want to enable. These are Lua package names.
 
 ==== File Globbing ====
 
-Globbing basically means pattern matching over filenames. It is a convenient
-way to use the filesystem as the index of what files to build rather than to
-manually type every file out in the `Sources` list. You can also combine the
-two for greater control by mixing globs and filenames.
+The `tundra.syntax.glob` extension provides file globbing (pattern matching
+over filenames.) It is a convenient way to use the filesystem as the index of
+what files to build rather than to manually type every file out in the
+`Sources` list. You can also combine the two for greater control by mixing
+globs and filenames.
 
 Globs come in two versions, `Glob` and `FGlob`.
 

scripts/tundra/boot.lua

@@ -140,7 +140,7 @@ function load_toolset(id, ...)
 end
 
 function load_syntax(id, decl, passes)
-	apply_extension_module(id, "tundra.syntax.", decl, passes)
+	apply_extension_module(id, "", decl, passes)
 end
 
 local function member(list, item)

tundra.lua

@@ -46,7 +46,7 @@ Build {
 		LuaCompile = { Name = "Compile Lua sources for embedding", BuildOrder = 2 },
 		Tundra = { Name = "Main compile pass", BuildOrder = 3 },
 	},
-	SyntaxExtensions = { "glob", "embed_lua" },
+	SyntaxExtensions = { "tundra.syntax.glob", "tundra.syntax.embed_lua" },
 	Configs = {
 		Config { Name = "macosx-clang", Inherit = common, Tools = { "clang-osx" }, DefaultOnHost = "macosx" },
 		Config { Name = "macosx-gcc", Inherit = common, Tools = { "gcc-osx" } },