Added support for preloaded modules.

suggest-require.lua

@@ -2,7 +2,7 @@
 -- This is a tiny library to discover which modules can be imported using
 -- `require`. It's intended to be included in an auto-complete system for Lua.
 
--- Not sure if it works on a system without GNU find :/
+-- Not sure if it works on a system without GNU find
 
 ---
 -- Constants
@@ -84,6 +84,13 @@ local function get_loaded_module_names ()
 	return l
 end
 
+local function get_preloaded_module_names ()
+	-- Get the names of preloaded modules.
+	local l = {}
+	for k in pairs(package.loaded) do  l[#l+1] = k  end
+	return l
+end
+
 local function get_module_names_from_path ()
 	local paths = get_module_paths(package.path)
 
@@ -106,20 +113,28 @@ local function get_c_module_names_from_path ()
 	return modules
 end
 
+local PACKAGE_SEARCH_METHODS = {
+	get_loaded_module_names,
+	get_preloaded_module_names,
+	get_module_names_from_path,
+	get_c_module_names_from_path,
+}
+
 local function get_available_module_names ()
+
+	-- Searches through the package system to determine which modules can be
+	-- imported by using `require`. Returns a sequence of strings, each of which
+	-- can be directly used by `require` to import the module.
+
 	assert(type(package) == 'table')
 
-	local names_loaded	= get_loaded_module_names()
-	local names_path  	= get_module_names_from_path()
-	local names_cpath 	= get_c_module_names_from_path()
-
-	--
-
-	-- Dedub and Sort
+	-- Find and Dedub
 	local dedub = {}
-	for i = 1, #names_loaded	do	dedub[names_loaded[i]]	= true  end
-	for i = 1, #names_path  	do	dedub[names_path[i]]  	= true  end
-	for i = 1, #names_cpath 	do	dedub[names_cpath[i]] 	= true  end
+	for _, method in ipairs(PACKAGE_SEARCH_METHODS) do
+		for _, name in ipairs(method()) do  dedub[name] = true  end
+	end
+
+	-- Sort
 	local module_names = {}
 	for name in pairs(dedub) do  module_names[#module_names+1] = name  end
 	table.sort(module_names)