diff base/HelperExecPath.cpp @ 1243:c7a710f806a1 piper

Add omitted files, again!

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base/HelperExecPath.cpp	Tue Nov 01 14:43:51 2016 +0000
@@ -0,0 +1,99 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2006-2016 Chris Cannam and QMUL.
+    
+    This program 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.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#include "HelperExecPath.h"
+
+#include <QCoreApplication>
+#include <QFile>
+#include <QDir>
+#include <QFileInfo>
+
+static QStringList
+getSuffixes()
+{
+    if (sizeof(void *) == 8) {
+        return { "-64", "", "-32" };
+    } else {
+        return { "", "-32" };
+    }
+}
+
+static bool
+isGood(QString path)
+{
+    return QFile(path).exists() && QFileInfo(path).isExecutable();
+}
+
+QStringList
+HelperExecPath::getHelperExecutables(QString basename)
+{
+    QStringList dummy;
+    return search(basename, dummy);
+}
+
+QString
+HelperExecPath::getHelperExecutable(QString basename)
+{
+    QStringList execs = getHelperExecutables(basename);
+    if (execs.empty()) return "";
+    else return execs[0];
+}
+
+QStringList
+HelperExecPath::getHelperDirPaths()
+{
+    QStringList dirs;
+    QString myDir = QCoreApplication::applicationDirPath();
+    dirs.push_back(myDir + "/helpers");
+    dirs.push_back(myDir);
+    return dirs;
+}
+
+QStringList
+HelperExecPath::getHelperCandidatePaths(QString basename)
+{
+    QStringList candidates;
+    (void)search(basename, candidates);
+    return candidates;
+}
+
+QStringList
+HelperExecPath::search(QString basename, QStringList &candidates)
+{
+    // Helpers are expected to exist either in the same directory as
+    // this executable was found, or in a subdirectory called helpers.
+
+    QString extension = "";
+#ifdef _WIN32
+    extension = ".exe";
+#endif
+
+    QStringList executables;
+    QStringList dirs = getHelperDirPaths();
+    
+    for (QString s: getSuffixes()) {
+        for (QString d: dirs) {
+            QString path = d + QDir::separator() + basename + s + extension;
+            candidates.push_back(path);
+            if (isGood(path)) {
+                executables.push_back(path);
+                break;
+            }
+        }
+    }
+
+    return executables;
+}
+