Merge pull request varnamproject#169 from asdofindia/enable-debugging

Add a simple debugging option to command line.

varnamc

@@ -105,6 +105,11 @@ optparse = OptionParser.new do |opts|
     $options[:verbose] = true
   end
 
+  $options[:debug] = false
+  opts.on('-z', '--debug', 'Enable debugging') do
+    $options[:debug] = true
+  end
+
   opts.on('-t', '--transliterate TEXT', 'Transliterate the given text') do |text|
     set_action('transliterate')
     $options[:text_to_transliterate] = text
@@ -313,6 +318,16 @@ def initialize_varnam_handle
     exit(1)
   end
 
+  if ($options[:debug])
+    puts "Turning debug on"
+    done = VarnamLibrary.varnam_enable_logging($varnam_handle.get_pointer(0), Varnam::VARNAM_LOG_DEBUG, DebugCallback);
+    if done != 0
+      error_message = VarnamLibrary.varnam_get_last_error($varnam_handle.get_pointer(0))
+      puts "Unable to turn debugging on. #{error_message}"
+      exit(1)
+    end
+  end
+
 end
 
 def get_file_path(fname)
@@ -1088,6 +1103,10 @@ ExportCallback = FFI::Function.new(:void, [:int, :int, :string]) do |total_words
     $stdout.flush
 end
 
+DebugCallback = FFI::Function.new(:void, [:string]) do |message|
+  puts message
+end
+
 def learn_from_file
   if $options[:learn_from].nil?
     puts "Nothing to learn"

varnamruby.rb

@@ -67,6 +67,7 @@ class Word < FFI::Struct
   attach_function :varnam_import_learnings_from_file, [:pointer, :string, :pointer], :int
   attach_function :varnam_create_stemrule, [:pointer, :string, :string], :int
   attach_function :varnam_create_stem_exception, [:pointer, :string, :string], :int
+  attach_function :varnam_enable_logging, [:pointer, :int, :pointer], :int
 end
 
 VarnamToken = Struct.new(:type, :pattern, :value1, :value2, :value3, :tag, :match_type, :priority, :accept_condition, :flags)
@@ -117,6 +118,9 @@ module Varnam
 
   VARNAM_EXPORT_WORDS = 0
   VARNAM_EXPORT_FULL = 1
+
+  VARNAM_LOG_DEFAULT = 1
+  VARNAM_LOG_DEBUG = 2
 
   # Language codes
   LANG_CODES = {VARNAM_LANG_CODE_UNKNOWN => 'Unknown',