Ability to direct output to a file or disable it.

By setting `debug_file`.

client.go

@@ -147,6 +147,10 @@ func (client *Client) SetLanguage(langs ...string) error {
 	return nil
 }
 
+func (client *Client) DisableOutput() error {
+	return client.SetVariable(DEBUG_FILE, os.DevNull)
+}
+
 // SetWhitelist sets whitelist chars.
 // See official documentation for whitelist here https://github.com/tesseract-ocr/tesseract/wiki/ImproveQuality#dictionaries-word-lists-and-patterns
 func (client *Client) SetWhitelist(whitelist string) error {

constant.go

@@ -65,6 +65,8 @@ type SettableVariable string
 // Followings are variables which can be used for TessBaseAPI::SetVariable.
 // If anything missing (I know there are many), please add one below.
 const (
+	// DEBUG_FILE - File to send output to.
+	DEBUG_FILE SettableVariable = "debug_file"
 	// TESSEDIT_CHAR_WHITELIST - Whitelist of chars to recognize
 	// There is a known issue in 4.00 with LSTM
 	// https://github.com/tesseract-ocr/tesseract/issues/751