move apis into rom/modules/main for shell compatibility

sys/modules/opus/config.lua

@@ -0,0 +1,50 @@
+local Util = require('opus.util')
+
+local fs    = _G.fs
+local shell = _ENV.shell
+
+local Config = { }
+
+function Config.load(fname, data)
+	local filename = 'usr/config/' .. fname
+	data = data or { }
+
+	if not fs.exists('usr/config') then
+		fs.makeDir('usr/config')
+	end
+
+	if not fs.exists(filename) then
+		Util.writeTable(filename, data)
+	else
+		local contents = Util.readTable(filename) or
+			error('Configuration file is corrupt:' .. filename)
+
+		Util.merge(data, contents)
+	end
+
+	return data
+end
+
+function Config.loadWithCheck(fname, data)
+	local filename = 'usr/config/' .. fname
+
+	if not fs.exists(filename) then
+		Config.load(fname, data)
+		print()
+		print('The configuration file has been created.')
+		print('The file name is: ' .. filename)
+		print()
+		_G.printError('Press enter to configure')
+		_G.read()
+		shell.run('edit ' .. filename)
+	end
+
+	return Config.load(fname, data)
+end
+
+function Config.update(fname, data)
+	local filename = 'usr/config/' .. fname
+	Util.writeTable(filename, data)
+end
+
+return Config