Wrap SymEngine::ascii_art() and replace the current function

ext/symengine/symengine.c

@@ -1,3 +1,4 @@
+#include <symengine/cwrapper.h>
 #include "ruby_basic.h"
 #include "ruby_symbol.h"
 #include "ruby_integer.h"
@@ -9,8 +10,16 @@
 // Ruby Bindings //
 ///////////////////
 
+VALUE msymengine_ascii_art(VALUE self) {
+    char* str = ascii_art_str();
+    VALUE ascii_art = rb_str_new_cstr(str);
+    basic_str_free(str);
+    return ascii_art;
+}
+
 void Init_symengine() {
     m_symengine = rb_define_module("SymEngine");
+    rb_define_singleton_method(m_symengine, "ascii_art", msymengine_ascii_art, 0);
 
     //Basic class
     c_basic = rb_define_class_under(m_symengine, "Basic", rb_cObject);

lib/symengine.rb

@@ -1,14 +1,3 @@
 require 'symengine/symengine'
 require 'symengine/iruby'
 require 'symengine/basic'
-
-module SymEngine
-  def SymEngine.ascii_art
-    puts "
- _____           _____         _
-|   __|_ _ _____|   __|___ ___|_|___ ___
-|__   | | |     |   __|   | . | |   | -_|
-|_____|_  |_|_|_|_____|_|_|_  |_|_|_|___|
-      |___|               |___|          "
-  end
-end

spec/symengine_spec.rb

@@ -0,0 +1,9 @@
+require 'spec_helper'
+
+describe SymEngine do
+  describe 'ascii_art' do
+    it 'should return a non-zero length string' do
+      assert SymEngine.ascii_art.length > 0
+    end
+  end
+end

symengine_version.txt

@@ -1 +1 @@
-f6f1c89bde0d12ba718a9aeddcdf630f36893756
+668cf3a16f7c3a162727a8ffd6776e84dca78a41