Align info method names with the C++ API.

The pattern is `samples` -> `num_samples`.

Fixes #18.

examples/mod-info

@@ -45,10 +45,10 @@ end
   puts "Tracker....: #{mod.tracker}"
   puts "Title......: #{mod.title}"
   puts "Duration...: #{duration_mins}:#{duration_secs.round(3)}"
-  puts "Subsongs...: #{mod.subsongs}"
-  puts "Channels...: #{mod.channels}"
-  puts "Orders.....: #{mod.orders}"
-  puts "Patterns...: #{mod.patterns}"
-  puts "Instruments: #{mod.instruments}"
-  puts "Samples....: #{mod.samples}"
+  puts "Subsongs...: #{mod.num_subsongs}"
+  puts "Channels...: #{mod.num_channels}"
+  puts "Orders.....: #{mod.num_orders}"
+  puts "Patterns...: #{mod.num_patterns}"
+  puts "Instruments: #{mod.num_instruments}"
+  puts "Samples....: #{mod.num_samples}"
 end

lib/ffi/openmpt/module.rb

@@ -45,32 +45,32 @@ def duration
         openmpt_module_get_duration_seconds(@mod)
       end
 
-      def subsongs
+      def num_subsongs
         return if closed?
         openmpt_module_get_num_subsongs(@mod)
       end
 
-      def channels
+      def num_channels
         return if closed?
         openmpt_module_get_num_channels(@mod)
       end
 
-      def orders
+      def num_orders
         return if closed?
         openmpt_module_get_num_orders(@mod)
       end
 
-      def patterns
+      def num_patterns
         return if closed?
         openmpt_module_get_num_patterns(@mod)
       end
 
-      def instruments
+      def num_instruments
         return if closed?
         openmpt_module_get_num_instruments(@mod)
       end
 
-      def samples
+      def num_samples
         return if closed?
         openmpt_module_get_num_samples(@mod)
       end

test/openmpt_module_test.rb

@@ -73,26 +73,26 @@ def test_open_block_and_change_sample_rate
   def test_informational_calls
     m = ::FFI::OpenMPT::Module.open(MOD_LAST_SUN) do |mod|
       assert_in_epsilon mod.duration, 236.4, 0.001
-      assert_equal mod.subsongs, 1
-      assert_equal mod.channels, 4
-      assert_equal mod.orders, 35
-      assert_equal mod.patterns, 20
-      assert_equal mod.instruments, 0
-      assert_equal mod.samples, 15
+      assert_equal mod.num_subsongs, 1
+      assert_equal mod.num_channels, 4
+      assert_equal mod.num_orders, 35
+      assert_equal mod.num_patterns, 20
+      assert_equal mod.num_instruments, 0
+      assert_equal mod.num_samples, 15
     end
 
     assert_nil m.duration
-    assert_nil m.subsongs
-    assert_nil m.channels
-    assert_nil m.orders
-    assert_nil m.patterns
-    assert_nil m.instruments
-    assert_nil m.samples
+    assert_nil m.num_subsongs
+    assert_nil m.num_channels
+    assert_nil m.num_orders
+    assert_nil m.num_patterns
+    assert_nil m.num_instruments
+    assert_nil m.num_samples
   end
 
   def test_sample_name
     ::FFI::OpenMPT::Module.open(MOD_LAST_SUN) do |mod|
-      mod.samples.times do |i|
+      mod.num_samples.times do |i|
         assert_equal mod.sample_name(i), SAMPLE_NAMES_LAST_SUN[i]
       end
     end