Signed-off-by: Felipe Contreras <felipe.contre...@gmail.com>
---

Notes:
    The Commit class inherits from the Object class, so commit.sha1() just 
works,
    even though it's an Object method.
    
    For now we don't define initializers or allocators, so Git::Commit.new() 
cannot
    really be used, but it's not needed at this point. These would be 
demonstrated
    later in the series.

 ruby.c           | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 t/t10000-ruby.sh | 21 ++++++++++++++
 2 files changed, 107 insertions(+)

diff --git a/ruby.c b/ruby.c
index 45111e6..53afa32 100644
--- a/ruby.c
+++ b/ruby.c
@@ -1,12 +1,17 @@
 #include "cache.h"
 #include "exec_cmd.h"
 #include "refs.h"
+#include "object.h"
+#include "commit.h"
 
 #undef NORETURN
 #undef PATH_SEP
 
 #include <ruby.h>
 
+static VALUE git_rb_object;
+static VALUE git_rb_commit;
+
 static inline VALUE sha1_to_str(const unsigned char *sha1)
 {
        return rb_str_new((const char *)sha1, 20);
@@ -19,6 +24,18 @@ static inline VALUE cstr_to_str(const char *str)
        return rb_str_new2(str);
 }
 
+static inline char *str_to_cstr(VALUE str)
+{
+       if (str == Qnil)
+               return NULL;
+       return RSTRING_PTR(str);
+}
+
+static inline unsigned char *str_to_sha1(VALUE str)
+{
+       return (unsigned char *)str_to_cstr(str);
+}
+
 static VALUE git_rb_setup_git_directory(VALUE self)
 {
        int nongit_ok;
@@ -91,8 +108,67 @@ static VALUE git_rb_get_sha1(VALUE self, VALUE name)
        return sha1_to_str(buf);
 }
 
+static VALUE git_rb_object_get(VALUE class, VALUE id)
+{
+       struct object *object;
+       object = parse_object(str_to_sha1(id));
+       return Data_Wrap_Struct(git_rb_object, NULL, NULL, object);
+}
+
+static VALUE git_rb_commit_get(VALUE class, VALUE id)
+{
+       struct object *object;
+       object = parse_object(str_to_sha1(id));
+       if (!object || object->type != OBJ_COMMIT)
+               return Qnil;
+       return Data_Wrap_Struct(git_rb_commit, NULL, NULL, object);
+}
+
+static VALUE git_rb_object_sha1(VALUE self)
+{
+       struct object *object;
+       Data_Get_Struct(self, struct object, object);
+       return sha1_to_str(object->sha1);
+}
+
+static VALUE git_rb_object_type(VALUE self)
+{
+       struct object *object;
+       Data_Get_Struct(self, struct object, object);
+       return INT2FIX(object->type);
+}
+
+static VALUE git_rb_object_to_s(VALUE self)
+{
+       struct object *object;
+       Data_Get_Struct(self, struct object, object);
+       return rb_str_new2(sha1_to_hex(object->sha1));
+}
+
+static VALUE git_rb_commit_buffer(VALUE self)
+{
+       struct commit *commit;
+       Data_Get_Struct(self, struct commit, commit);
+       return cstr_to_str(commit->buffer);
+}
+
 static void git_ruby_init(void)
 {
+       VALUE mod;
+
+       mod = rb_define_module("Git");
+
+       rb_define_global_const("OBJ_BAD", INT2FIX(OBJ_BAD));
+       rb_define_global_const("OBJ_NONE", INT2FIX(OBJ_NONE));
+       rb_define_global_const("OBJ_COMMIT", INT2FIX(OBJ_COMMIT));
+       rb_define_global_const("OBJ_TREE", INT2FIX(OBJ_TREE));
+       rb_define_global_const("OBJ_BLOB", INT2FIX(OBJ_BLOB));
+       rb_define_global_const("OBJ_TAG", INT2FIX(OBJ_TAG));
+       rb_define_global_const("OBJ_OFS_DELTA", INT2FIX(OBJ_OFS_DELTA));
+       rb_define_global_const("OBJ_REF_DELTA", INT2FIX(OBJ_REF_DELTA));
+       rb_define_global_const("OBJ_ANY", INT2FIX(OBJ_ANY));
+       rb_define_global_const("OBJ_MAX", INT2FIX(OBJ_MAX));
+
        rb_define_global_function("setup_git_directory", 
git_rb_setup_git_directory, 0);
        rb_define_global_function("for_each_ref", git_rb_for_each_ref, 0);
        rb_define_global_function("dwim_ref", git_rb_dwim_ref, 1);
@@ -100,6 +176,16 @@ static void git_ruby_init(void)
        rb_define_global_function("read_ref", git_rb_read_ref, 1);
        rb_define_global_function("peel_ref", git_rb_peel_ref, 1);
        rb_define_global_function("get_sha1", git_rb_get_sha1, 1);
+
+       git_rb_object = rb_define_class_under(mod, "Object", rb_cData);
+       rb_define_singleton_method(git_rb_object, "get", git_rb_object_get, 1);
+       rb_define_method(git_rb_object, "sha1", git_rb_object_sha1, 0);
+       rb_define_method(git_rb_object, "type", git_rb_object_type, 0);
+       rb_define_method(git_rb_object, "to_s", git_rb_object_to_s, 0);
+
+       git_rb_commit = rb_define_class_under(mod, "Commit", git_rb_object);
+       rb_define_singleton_method(git_rb_commit, "get", git_rb_commit_get, 1);
+       rb_define_method(git_rb_commit, "buffer", git_rb_commit_buffer, 0);
 }
 
 static int run_ruby_command(const char *cmd, int argc, const char **argv)
diff --git a/t/t10000-ruby.sh b/t/t10000-ruby.sh
index 849a615..e5a397c 100755
--- a/t/t10000-ruby.sh
+++ b/t/t10000-ruby.sh
@@ -81,4 +81,25 @@ test_expect_success 'test get_sha1()' '
        test_cmp expected actual
 '
 
+test_expect_success 'test Object' '
+       git ruby > actual <<-EOF &&
+       object = Git::Object.get(get_sha1("HEAD"))
+       puts object, object.type == OBJ_COMMIT, sha1_to_hex(object.sha1)
+       EOF
+       git rev-parse -q --verify HEAD > expected &&
+       echo "true" >> expected &&
+       git rev-parse -q --verify HEAD >> expected &&
+       test_cmp expected actual
+'
+
+test_expect_success 'test Commit' '
+       git ruby > actual <<-EOF &&
+       commit = Git::Commit.get(get_sha1("HEAD"))
+       puts commit, commit.buffer
+       EOF
+       git rev-parse -q --verify HEAD > expected &&
+       git cat-file commit HEAD >> expected &&
+       test_cmp expected actual
+'
+
 test_done
-- 
1.8.4-fc

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