Initial scaffolding for a simple Objective-C Ruby Extension.

Makefile

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+
+SHELL = /bin/sh
+
+#### Start of system configuration section. ####
+
+srcdir = .
+topdir = /Users/aitrus/.rvm/rubies/ruby-1.9.2-p0/include/ruby-1.9.1
+hdrdir = /Users/aitrus/.rvm/rubies/ruby-1.9.2-p0/include/ruby-1.9.1
+arch_hdrdir = /Users/aitrus/.rvm/rubies/ruby-1.9.2-p0/include/ruby-1.9.1/$(arch)
+VPATH = $(srcdir):$(arch_hdrdir)/ruby:$(hdrdir)/ruby
+prefix = $(DESTDIR)/Users/aitrus/.rvm/rubies/ruby-1.9.2-p0
+rubylibprefix = $(libdir)/$(RUBY_BASE_NAME)
+exec_prefix = $(prefix)
+vendorhdrdir = $(rubyhdrdir)/vendor_ruby
+sitehdrdir = $(rubyhdrdir)/site_ruby
+rubyhdrdir = $(includedir)/$(RUBY_BASE_NAME)-$(ruby_version)
+vendordir = $(rubylibprefix)/vendor_ruby
+sitedir = $(rubylibprefix)/site_ruby
+ridir = $(datarootdir)/$(RI_BASE_NAME)
+mandir = $(datarootdir)/man
+localedir = $(datarootdir)/locale
+libdir = $(exec_prefix)/lib
+psdir = $(docdir)
+pdfdir = $(docdir)
+dvidir = $(docdir)
+htmldir = $(docdir)
+infodir = $(datarootdir)/info
+docdir = $(datarootdir)/doc/$(PACKAGE)
+oldincludedir = $(DESTDIR)/usr/include
+includedir = $(prefix)/include
+localstatedir = $(prefix)/var
+sharedstatedir = $(prefix)/com
+sysconfdir = $(prefix)/etc
+datadir = $(datarootdir)
+datarootdir = $(prefix)/share
+libexecdir = $(exec_prefix)/libexec
+sbindir = $(exec_prefix)/sbin
+bindir = $(exec_prefix)/bin
+rubylibdir = $(rubylibprefix)/$(ruby_version)
+archdir = $(rubylibdir)/$(arch)
+sitelibdir = $(sitedir)/$(ruby_version)
+sitearchdir = $(sitelibdir)/$(sitearch)
+vendorlibdir = $(vendordir)/$(ruby_version)
+vendorarchdir = $(vendorlibdir)/$(sitearch)
+
+CC = gcc
+CXX = g++
+LIBRUBY = $(LIBRUBY_SO)
+LIBRUBY_A = lib$(RUBY_SO_NAME)-static.a
+LIBRUBYARG_SHARED = -l$(RUBY_SO_NAME)
+LIBRUBYARG_STATIC = -l$(RUBY_SO_NAME)-static
+OUTFLAG = -o 
+COUTFLAG = -o 
+
+RUBY_EXTCONF_H = 
+cflags   =  $(optflags) $(debugflags) $(warnflags)
+optflags = -O3
+debugflags = -ggdb
+warnflags = -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wshorten-64-to-32 -Wno-long-long
+CFLAGS   = -fno-common $(cflags)  -fno-common -pipe 
+INCFLAGS = -I. -I$(arch_hdrdir) -I$(hdrdir)/ruby/backward -I$(hdrdir) -I$(srcdir)
+DEFS     = 
+CPPFLAGS =  -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE $(DEFS) $(cppflags)
+CXXFLAGS = $(CFLAGS) $(cxxflags)
+ldflags  = -L. 
+dldflags = -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -Wl,-flat_namespace -framework Foundation
+ARCH_FLAG = 
+DLDFLAGS = $(ldflags) $(dldflags)
+LDSHARED = $(CC) -dynamic -bundle
+LDSHAREDXX = $(CXX) -dynamic -bundle
+AR = ar
+EXEEXT = 
+
+RUBY_BASE_NAME = ruby
+RUBY_INSTALL_NAME = ruby
+RUBY_SO_NAME = ruby.1.9.1
+arch = x86_64-darwin10.4.0
+sitearch = $(arch)
+ruby_version = 1.9.1
+ruby = /Users/aitrus/.rvm/rubies/ruby-1.9.2-p0/bin/ruby
+RUBY = $(ruby)
+RM = rm -f
+RM_RF = $(RUBY) -run -e rm -- -rf
+RMDIRS = $(RUBY) -run -e rmdir -- -p
+MAKEDIRS = /usr/local/bin/gmkdir -p
+INSTALL = /usr/local/bin/ginstall -c
+INSTALL_PROG = $(INSTALL) -m 0755
+INSTALL_DATA = $(INSTALL) -m 644
+COPY = cp
+
+#### End of system configuration section. ####
+
+preload = 
+
+libpath = . $(libdir)
+LIBPATH =  -L. -L$(libdir)
+DEFFILE = 
+
+CLEANFILES = mkmf.log
+DISTCLEANFILES = 
+DISTCLEANDIRS = 
+
+extout = 
+extout_prefix = 
+target_prefix = 
+LOCAL_LIBS = 
+LIBS = $(LIBRUBYARG_SHARED)  -lpthread -ldl -lobjc 
+SRCS = fraction.m rb_fraction.m
+OBJS = fraction.o rb_fraction.o
+TARGET = Fraction
+DLLIB = $(TARGET).bundle
+EXTSTATIC = 
+STATIC_LIB = 
+
+BINDIR        = $(bindir)
+RUBYCOMMONDIR = $(sitedir)$(target_prefix)
+RUBYLIBDIR    = $(sitelibdir)$(target_prefix)
+RUBYARCHDIR   = $(sitearchdir)$(target_prefix)
+HDRDIR        = $(rubyhdrdir)/ruby$(target_prefix)
+ARCHHDRDIR    = $(rubyhdrdir)/$(arch)/ruby$(target_prefix)
+
+TARGET_SO     = $(DLLIB)
+CLEANLIBS     = $(TARGET).bundle 
+CLEANOBJS     = *.o  *.bak
+
+all:    $(DLLIB)
+static: $(STATIC_LIB)
+.PHONY: all install static install-so install-rb
+.PHONY: clean clean-so clean-rb
+
+clean-rb-default::
+clean-rb::
+clean-so::
+clean: clean-so clean-rb-default clean-rb
+		@-$(RM) $(CLEANLIBS) $(CLEANOBJS) $(CLEANFILES)
+
+distclean-rb-default::
+distclean-rb::
+distclean-so::
+distclean: clean distclean-so distclean-rb-default distclean-rb
+		@-$(RM) Makefile $(RUBY_EXTCONF_H) conftest.* mkmf.log
+		@-$(RM) core ruby$(EXEEXT) *~ $(DISTCLEANFILES)
+		@-$(RMDIRS) $(DISTCLEANDIRS)
+
+realclean: distclean
+install: install-so install-rb
+
+install-so: $(RUBYARCHDIR)
+install-so: $(RUBYARCHDIR)/$(DLLIB)
+$(RUBYARCHDIR)/$(DLLIB): $(DLLIB)
+	@-$(MAKEDIRS) $(@D)
+	$(INSTALL_PROG) $(DLLIB) $(@D)
+install-rb: pre-install-rb install-rb-default
+install-rb-default: pre-install-rb-default
+pre-install-rb: Makefile
+pre-install-rb-default: Makefile
+$(RUBYARCHDIR):
+	$(MAKEDIRS) $@
+
+site-install: site-install-so site-install-rb
+site-install-so: install-so
+site-install-rb: install-rb
+
+.SUFFIXES: .c .m .cc .cxx .cpp .C .o
+
+.cc.o:
+	$(CXX) $(INCFLAGS) $(CPPFLAGS) $(CXXFLAGS) $(COUTFLAG)$@ -c $<
+
+.cxx.o:
+	$(CXX) $(INCFLAGS) $(CPPFLAGS) $(CXXFLAGS) $(COUTFLAG)$@ -c $<
+
+.cpp.o:
+	$(CXX) $(INCFLAGS) $(CPPFLAGS) $(CXXFLAGS) $(COUTFLAG)$@ -c $<
+
+.C.o:
+	$(CXX) $(INCFLAGS) $(CPPFLAGS) $(CXXFLAGS) $(COUTFLAG)$@ -c $<
+
+.m.o:
+	$(CC) $(INCFLAGS) $(CPPFLAGS) $(CFLAGS) $(COUTFLAG)$@ -c $<
+
+.m.o:
+	$(CC) $(INCFLAGS) $(CPPFLAGS) $(CFLAGS) $(COUTFLAG)$@ -c $<
+
+$(DLLIB): $(OBJS) Makefile
+	@-$(RM) $(@)
+	$(LDSHARED) -o $@ $(OBJS) $(LIBPATH) $(DLDFLAGS) $(LOCAL_LIBS) $(LIBS)
+
+
+
+$(OBJS): $(hdrdir)/ruby.h $(hdrdir)/ruby/defines.h $(arch_hdrdir)/ruby/config.h

extconf.rb

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+# mkmf: http://ruby-doc.org/stdlib/libdoc/mkmf/rdoc/index.html
+require 'mkmf'
+
+# While looking at extconf.rb examples, I yoinked this... Forgetting who I snagged it from.
+def command(cmd)
+  $stderr.puts "execute '#{cmd}' ..."
+  raise(RuntimeError, cmd) unless system(cmd)
+  $stderr.puts "execute '#{cmd}' done"
+end
+
+# Name your extension
+extension_name = 'Fraction'
+
+# Set your target name
+dir_config(extension_name)
+
+# Compilation Flags. Not absolutely necessary, but may save you a headache.
+$DLDFLAGS << " -framework Foundation"
+
+# Do the work
+create_makefile(extension_name)
+
+command "mv -f Makefile Makefile.bak"
+command "sed -e 's/^\.c\.o:$/\.m\.o:/' Makefile.bak > Makefile"
+command "rm Makefile.bak"

fraction.h

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+#import <Foundation/NSObject.h>
+#import "ruby.h"
+
+@interface Fraction: NSObject {
+  VALUE numerator;
+  VALUE denominator;
+}
+
+-(void)   setNumerator:   (VALUE) _numerator;
+-(void)   setDenominator: (VALUE) _denominator;
+-(VALUE)  numerator;
+-(VALUE)  denominator;
+
+@end

fraction.m

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+#import "Fraction.h"
+
+@implementation Fraction
+-(void)   setNumerator: (VALUE) _numerator {
+    numerator = _numerator;
+}
+
+-(void)   setDenominator: (VALUE) _denominator {
+    denominator = _denominator;
+}
+
+-(VALUE)  denominator {
+    return denominator;
+}
+
+-(VALUE)  numerator {
+    return numerator;
+}
+@end

rb_fraction.h

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+#import <Foundation/Foundation.h>
+#import "fraction.h"
+#import "ruby.h"
+
+void  Init_fraction();
+VALUE rb_get_numerator(VALUE);
+VALUE rb_get_denominator(VALUE);
+VALUE rb_set_numerator(VALUE, VALUE);
+VALUE rb_set_denominator(VALUE, VALUE);
+void  fraction_mark(Fraction*);
+void  fraction_free(Fraction*);
+VALUE fraction_allocate(VALUE);
+VALUE fraction_initialize(VALUE);

rb_fraction.m

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+#import "rb_fraction.h"
+
+// Defining a space for information and references about the module to be stored internally
+VALUE               rb_cFraction = Qnil;
+Fraction           *frac;
+NSAutoreleasePool  *pool;
+
+void Init_fraction() {
+  frac          = [[Fraction alloc] init];
+  rb_cFraction  = rb_define_class("Fraction", rb_cObject);
+
+  rb_define_method(rb_cFraction, "initialize",    fraction_initialize,  0);
+  rb_define_method(rb_cFraction, "numerator=",    rb_set_numerator,     1);
+  rb_define_method(rb_cFraction, "numerator",     rb_get_numerator,     0);
+  rb_define_method(rb_cFraction, "denominator",   rb_get_denominator,   0);
+  rb_define_method(rb_cFraction, "denominator=",  rb_set_denominator,   1);
+}
+
+VALUE rb_get_numerator(VALUE self) {
+  return [frac numerator];
+}
+
+VALUE rb_get_denominator(VALUE self) {
+  return [frac denominator];
+}
+
+VALUE rb_set_numerator(VALUE self, VALUE numerator) {
+  if(frac) {
+    [frac setNumerator:numerator];
+    return [frac numerator];
+  }
+  return Qnil;
+}
+
+VALUE rb_set_denominator(VALUE self, VALUE denominator) {
+  if(frac) {
+    [frac setDenominator:denominator];
+    return [frac denominator];
+  }
+  return Qnil;
+}
+
+void fraction_mark(Fraction *fraction) {
+  rb_gc_mark([fraction numerator]);
+  rb_gc_mark([fraction denominator]);
+}
+
+void fraction_free(Fraction *fraction) {
+  [fraction release];
+}
+
+VALUE fraction_allocate(VALUE klass) {
+  Fraction *fraction = [[Fraction alloc] init];
+
+  [fraction setDenominator:Qnil];
+  [fraction setNumerator:Qnil];
+
+  return Data_Wrap_Struct(klass, fraction_mark, fraction_free, fraction);
+}
+
+VALUE fraction_initialize(VALUE self) {
+  Fraction *fraction;
+// Can't use Data_Get_Struct, but it's 'coo.
+//  Data_Get_Struct(self, Fraction, fraction);
+  fraction = (Fraction*)DATA_PTR(self);
+  return self;
+}
+

tst.rb

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+puts %Q{requiring... ./fraction}
+puts require './fraction'
+
+puts %Q{including... Fraction}
+puts a = Fraction.new
+
+puts "a.numerator = 23"
+puts "=> #{a.numerator = 23}"
+
+puts "a.denominator = 32"
+puts "=> #{a.denominator = 32}"
+