premake/util/sdl_gen_config.lua
changeset 7925 f090a47eb7f7
child 8149 681eb46b8ac4
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/premake/util/sdl_gen_config.lua	Sun Nov 10 00:38:37 2013 -0500
@@ -0,0 +1,68 @@
+-- Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
+--
+-- This software is provided 'as-is', without any express or implied
+-- warranty.  In no event will the authors be held liable for any damages
+-- arising from the use of this software.
+--
+-- Permission is granted to anyone to use this software for any purpose,
+-- including commercial applications, and to alter it and redistribute it
+-- freely.
+--
+-- Meta-build system using premake created and maintained by
+-- Benjamin Henning <b.henning@digipen.edu>
+
+--[[
+sdl_gen_config.lua
+
+	Given a series of set configuration values from the project definitions,
+	this file contains a series of functions that generate valid preprocessor
+	definitions to enable or disable various features of the SDL2 library. These
+	definitions are pasted into a template SDL config header file, which is then
+	saved in the local directory and referenced to in generated project files.
+
+	This file depends on sdl_file.lua.
+]]
+
+-- The line that must exist in the template file in order to properly paste
+-- the generated definitions.
+local searchKey = "/%* Paste generated code here %*/\n"
+
+local configFile, templateFileContents
+local insertLocation
+
+-- This function begins config header generation given the name of the generated
+-- file and the name of the template file to use.
+function startGeneration(file, template)
+	configFile = fileopen(file, "wt")
+	templateFileContents = readfile(template, "rt")
+	insertLocation = templateFileContents:find(searchKey)
+	if insertLocation then
+		configFile:write(templateFileContents:sub(1, insertLocation - 1))
+	end
+end
+
+-- Adds a table of configuration values to the generated file. Each
+-- configuration line is wrapped around a preprocessor definition check, so they
+-- can be manually overwritten by the developer if necessary. The definition
+-- pastes string versions of both the key and the value on the line, where
+-- either is allowed to be empty. That means the table stores key-value pairs.
+function addConfig(tbl)
+	-- if no insert location, don't paste anything
+	if not insertLocation then return end
+	for k,v in pairs(tbl) do
+		configFile:print(0, "#ifndef " .. k)
+		configFile:print(0, "#define " .. tostring(k) .. " " .. tostring(v))
+		configFile:print(0, "#endif")
+	end
+end
+
+-- Finishes the generation and writes the remains of the template file into the
+-- generated config file.
+function endGeneration()
+	if insertLocation then
+		configFile:write(templateFileContents:sub(insertLocation + #searchKey - 2))
+	else -- write entire file since nothing is being pasted
+		configFile:write(templateFileContents)
+	end
+	configFile:close()
+end
\ No newline at end of file