Simplify Lua brew

* Replace the wodgy patch with use of inreplace and ENV vars.
* Keep the (initially empty) share/lua and lib/lua folders around, so that
  lua package managers can put modules there.

Library/Formula/lua.rb

@@ -4,119 +4,38 @@ class Lua <Formula
   url 'http://www.lua.org/ftp/lua-5.1.4.tar.gz'
   homepage 'http://www.lua.org/'
   md5 'd0870f2de55d59c1c8419f36e8fac150'
-
-  def patches
-    DATA
+
+  # Don't skip share and lib folders; that's where
+  # lua modules will get installed to.
+  def skip_clean? path
+    [share+'lua', share+'lua/5.1', lib+'lua', lib+'lua/5.1'].include? path
   end
 
   def install
-    inreplace ['Makefile', 'src/luaconf.h', 'etc/lua.pc'],
-      '/usr/local', prefix
+    # Use our CC/CFLAGS to compile.
+    inreplace 'src/Makefile' do |s|
+      s.remove_make_var! 'CC'
+      s.change_make_var! 'CFLAGS', "#{ENV['CFLAGS']} $(MYCFLAGS)"
+    end
 
+    # Fix path in the config header
     inreplace 'src/luaconf.h', '/usr/local', HOMEBREW_PREFIX
 
-    ENV.append "CFLAGS", "-DLUA_USE_LINUX"
+    # Fix paths in the .pc
+    inreplace 'etc/lua.pc' do |s|
+      s.gsub! "prefix= /usr/local", "prefix=#{HOMEBREW_PREFIX}"
+      s.gsub! "INSTALL_MAN= ${prefix}/man/man1", "INSTALL_MAN= ${prefix}/share/man/man1"
+    end
+
+    # Apply patch-level 2
+    cd 'src' do
+      curl "http://www.lua.org/ftp/patch-lua-5.1.4-2", "-O"
+      `patch < patch-lua-5.1.4-2`
+    end
+
+    system "make", "macosx", "INSTALL_TOP=#{prefix}", "INSTALL_MAN=#{man1}"
+    system "make", "install", "INSTALL_TOP=#{prefix}", "INSTALL_MAN=#{man1}"
 
-    system "make macosx"
-    system "make install"
-
     (lib+"pkgconfig").install 'etc/lua.pc'
   end
 end
-
-
-# TODO honestly maybe this is better as it was before, ie. a gist. It's long
-# and potentially more useful to other people as a gist.
-__END__
-diff -Naur lua-5.1.4/Makefile lua-5.1.4-2/Makefile
---- lua-5.1.4/Makefile	2008-08-11 18:40:48.000000000 -0600
-+++ lua-5.1.4-2/Makefile	2009-09-04 16:30:22.000000000 -0600
-@@ -13,7 +13,7 @@
- INSTALL_BIN= $(INSTALL_TOP)/bin
- INSTALL_INC= $(INSTALL_TOP)/include
- INSTALL_LIB= $(INSTALL_TOP)/lib
--INSTALL_MAN= $(INSTALL_TOP)/man/man1
-+INSTALL_MAN= $(INSTALL_TOP)/share/man/man1
- #
- # You probably want to make INSTALL_LMOD and INSTALL_CMOD consistent with
- # LUA_ROOT, LUA_LDIR, and LUA_CDIR in luaconf.h (and also with etc/lua.pc).
-diff -Naur lua-5.1.4/etc/Makefile lua-5.1.4-2/etc/Makefile
---- lua-5.1.4/etc/Makefile	2006-02-07 12:09:30.000000000 -0700
-+++ lua-5.1.4-2/etc/Makefile	2009-09-04 16:49:51.000000000 -0600
-@@ -7,10 +7,9 @@
- SRC= $(TOP)/src
- TST= $(TOP)/test
-
--CC= gcc
--CFLAGS= -O2 -Wall -I$(INC) $(MYCFLAGS)
-+CC= gcc-4.2
- MYCFLAGS= 
--MYLDFLAGS= -Wl,-E
-+MYLDFLAGS= $(LDFLAGS) -Wl,-E
- MYLIBS= -lm
- #MYLIBS= -lm -Wl,-E -ldl -lreadline -lhistory -lncurses
- RM= rm -f
-@@ -19,7 +18,7 @@
- 	@echo 'Please choose a target: min noparser one strict clean'
-
- min:	min.c
--	$(CC) $(CFLAGS) $@.c -L$(LIB) -llua $(MYLIBS)
-+	$(CC) $(CFLAGS) -I$(INC) $@.c -L$(LIB) -llua $(MYLIBS)
- 	echo 'print"Hello there!"' | ./a.out
-
- noparser: noparser.o
-@@ -29,7 +28,7 @@
- 	-./a.out -e'a=1'
-
- one:
--	$(CC) $(CFLAGS) all.c $(MYLIBS)
-+	$(CC) $(CFLAGS) -I$(INC) all.c $(MYLIBS)
- 	./a.out $(TST)/hello.lua
-
- strict:
-diff -Naur lua-5.1.4/etc/lua.pc lua-5.1.4-2/etc/lua.pc
---- lua-5.1.4/etc/lua.pc	2008-08-08 06:46:11.000000000 -0600
-+++ lua-5.1.4-2/etc/lua.pc	2009-09-04 16:30:35.000000000 -0600
-@@ -12,7 +12,7 @@
- INSTALL_BIN= ${prefix}/bin
- INSTALL_INC= ${prefix}/include
- INSTALL_LIB= ${prefix}/lib
--INSTALL_MAN= ${prefix}/man/man1
-+INSTALL_MAN= ${prefix}/share/man/man1
- INSTALL_LMOD= ${prefix}/share/lua/${V}
- INSTALL_CMOD= ${prefix}/lib/lua/${V}
-
-diff -Naur lua-5.1.4/src/Makefile lua-5.1.4-2/src/Makefile
---- lua-5.1.4/src/Makefile	2008-01-19 12:37:58.000000000 -0700
-+++ lua-5.1.4-2/src/Makefile	2009-09-04 16:49:18.000000000 -0600
-@@ -7,15 +7,14 @@
- # Your platform. See PLATS for possible values.
- PLAT= none
-
--CC= gcc
--CFLAGS= -O2 -Wall $(MYCFLAGS)
-+CC= gcc-4.2
- AR= ar rcu
- RANLIB= ranlib
- RM= rm -f
- LIBS= -lm $(MYLIBS)
-
- MYCFLAGS=
--MYLDFLAGS=
-+MYLDFLAGS= $(LDFLAGS)
- MYLIBS=
-
- # == END OF USER SETTINGS. NO NEED TO CHANGE ANYTHING BELOW THIS LINE =========
-@@ -52,10 +51,10 @@
- 	$(RANLIB) $@
-
- $(LUA_T): $(LUA_O) $(LUA_A)
--	$(CC) -o $@ $(MYLDFLAGS) $(LUA_O) $(LUA_A) $(LIBS)
-+	$(CC) $(CFLAGS) -o $@ $(MYLDFLAGS) $(LUA_O) $(LUA_A) $(LIBS)
-
- $(LUAC_T): $(LUAC_O) $(LUA_A)
--	$(CC) -o $@ $(MYLDFLAGS) $(LUAC_O) $(LUA_A) $(LIBS)
-+	$(CC) $(CFLAGS) -o $@ $(MYLDFLAGS) $(LUAC_O) $(LUA_A) $(LIBS)
-
- clean:
- 	$(RM) $(ALL_T) $(ALL_O)