qt: Add a function that extracts the suffix from a filter

Extract the 'Extract first suffix from filter pattern...'
functionality into a testable utility function

1 files changed, 8 insertions, 0 deletions

diff --git a/src/qt/guiutil.h b/src/qt/guiutil.h
index e38ac6026a..acbe415a91 100644
--- a/src/qt/guiutil.h
+++ b/src/qt/guiutil.h
@@ -123,6 +123,14 @@ namespace GUIUtil
      */
     QString getDefaultDataDirectory();
 
+    /**
+     * Extract first suffix from filter pattern "Description (*.foo)" or "Description (*.foo *.bar ...).
+     *
+     * @param[in] filter Filter specification such as "Comma Separated Files (*.csv)"
+     * @return QString
+     */
+    QString ExtractFirstSuffixFromFilter(const QString& filter);
+
     /** Get save filename, mimics QFileDialog::getSaveFileName, except that it appends a default suffix
         when no suffix is provided by the user.