qt: Add helper for converting QStringList to vector of strings

* lang/qt/src/util.h, lang/qt/src/util.cpp: New.
* lang/qt/src/Makefile.am (qgpgme_sources, private_qgpgme_headers):
Add new files.
--

Additionally to the internal helper function toStrings(), this adds
a copy of the internal make_error helper of GpgME++ which is used
in a few places by QGpgME. We use the same error source id as GpgME++.

GnuPG-bug-id: 5808

lang/qt/src/Makefile.am

@@ -42,7 +42,8 @@ qgpgme_sources = \
     qgpgmetofupolicyjob.cpp qgpgmequickjob.cpp \
     defaultkeygenerationjob.cpp qgpgmewkspublishjob.cpp \
     qgpgmegpgcardjob.cpp changeexpiryjob.cpp importjob.cpp \
-    dn.cpp cryptoconfig.cpp wkdlookupresult.cpp
+    dn.cpp cryptoconfig.cpp wkdlookupresult.cpp \
+    util.cpp
 
 # If you add one here make sure that you also add one in camelcase
 qgpgme_headers= \
@@ -165,7 +166,8 @@ private_qgpgme_headers = \
     qgpgmetofupolicyjob.h \
     qgpgmegpgcardjob.h \
     qgpgmequickjob.h \
-    threadedjobmixin.h
+    threadedjobmixin.h \
+    util.h
 
 qgpgme_moc_sources = \
     abstractimportjob.moc \

lang/qt/src/util.cpp

@@ -0,0 +1,46 @@
+/*
+    util.cpp
+
+    This file is part of qgpgme, the Qt API binding for gpgme
+    Copyright (c) 2022 g10 Code GmbH
+    Software engineering by Ingo Klöcker <dev@ingo-kloecker.de>
+
+    QGpgME is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.
+
+    QGpgME is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of this program with any edition of
+    the Qt library by Trolltech AS, Norway (or with modified versions
+    of Qt that use the same license as Qt), and distribute linked
+    combinations including the two.  You must obey the GNU General
+    Public License in all respects for all of the code used other than
+    Qt.  If you modify this file, you may extend this exception to
+    your version of the file, but you are not obligated to do so.  If
+    you do not wish to do so, delete this exception statement from
+    your version.
+*/
+
+#include "util.h"
+
+#include <QStringList>
+
+std::vector<std::string> toStrings(const QStringList &l)
+{
+    std::vector<std::string> v;
+    v.reserve(l.size());
+    std::transform(std::begin(l), std::end(l),
+                   std::back_inserter(v),
+                   std::mem_fn(&QString::toStdString));
+    return v;
+}

lang/qt/src/util.h

@@ -0,0 +1,51 @@
+/*
+    util.h - some internal helpers
+
+    This file is part of qgpgme, the Qt API binding for gpgme
+    Copyright (c) 2022 g10 Code GmbH
+    Software engineering by Ingo Klöcker <dev@ingo-kloecker.de>
+
+    QGpgME is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.
+
+    QGpgME is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of this program with any edition of
+    the Qt library by Trolltech AS, Norway (or with modified versions
+    of Qt that use the same license as Qt), and distribute linked
+    combinations including the two.  You must obey the GNU General
+    Public License in all respects for all of the code used other than
+    Qt.  If you modify this file, you may extend this exception to
+    your version of the file, but you are not obligated to do so.  If
+    you do not wish to do so, delete this exception statement from
+    your version.
+*/
+
+#ifndef __QGPGME_UTIL_H__
+#define __QGPGME_UTIL_H__
+
+#include <gpgme.h>
+
+#include <string>
+#include <vector>
+
+class QStringList;
+
+static inline gpgme_error_t make_error(gpgme_err_code_t code)
+{
+    return gpgme_err_make((gpgme_err_source_t)22, code);
+}
+
+std::vector<std::string> toStrings(const QStringList &l);
+
+#endif // __QGPGME_UTIL_H__