move helper functions to separate file. add overloads to mystrdup()

tools/lammps-gui/helpers.cpp

@@ -0,0 +1,71 @@
+/* ----------------------------------------------------------------------
+   LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
+   https://www.lammps.org/, Sandia National Laboratories
+   LAMMPS development team: developers@lammps.org
+
+   Copyright (2003) Sandia Corporation.  Under the terms of Contract
+   DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
+   certain rights in this software.  This software is distributed under
+   the GNU General Public License.
+
+   See the README file in the top-level LAMMPS directory.
+------------------------------------------------------------------------- */
+
+#include "helpers.h"
+
+#include <QFile>
+#include <QFileInfo>
+#include <QProcess>
+#include <QStringList>
+
+// duplicate string, STL version
+char *mystrdup(const std::string &text)
+{
+    auto tmp = new char[text.size() + 1];
+    memcpy(tmp, text.c_str(), text.size() + 1);
+    return tmp;
+}
+
+// duplicate string, pointer version
+char *mystrdup(const char *text)
+{
+    return mystrdup(std::string(text));
+}
+
+// duplicate string, Qt version
+char *mystrdup(const QString &text)
+{
+    return mystrdup(text.toStdString());
+}
+
+// find if executable is in path
+// https://stackoverflow.com/a/51041497
+
+bool has_exe(const QString &exe)
+{
+    QProcess findProcess;
+    QStringList arguments;
+    arguments << exe;
+#if defined(_WIN32)
+    findProcess.start("where", arguments);
+#else
+    findProcess.start("which", arguments);
+#endif
+    findProcess.setReadChannel(QProcess::ProcessChannel::StandardOutput);
+
+    if (!findProcess.waitForFinished()) return false; // Not found or which does not work
+
+    QString retStr(findProcess.readAll());
+    retStr = retStr.trimmed();
+
+    QFile file(retStr);
+    QFileInfo check_file(file);
+    if (check_file.exists() && check_file.isFile())
+        return true; // Found!
+    else
+        return false; // Not found!
+}
+
+// Local Variables:
+// c-basic-offset: 4
+// End: