GUI: Refactoring pythonCmd lookup

gui/checkthread.cpp

@@ -258,8 +258,12 @@ void CheckThread::runAddonsAndTools(const ImportProject::FileSettings *fileSetti
 
             parseClangErrors(addon, fileName, errout);
         } else {
-            const QString a = CheckThread::getAddonFilePath(mDataDir, addon + ".py");
-            if (a.isEmpty())
+            const QString python = CheckThread::pythonCmd();
+            if (python.isEmpty())
+                continue;
+
+            const QString addonFilePath = CheckThread::getAddonFilePath(mDataDir, addon + ".py");
+            if (addonFilePath.isEmpty())
                 continue;
 
             if (dumpFile.isEmpty()) {
@@ -281,15 +285,14 @@ void CheckThread::runAddonsAndTools(const ImportProject::FileSettings *fileSetti
                 mCppcheck.settings().buildDir = buildDir;
             }
 
-            const QString python = mPythonPath.isEmpty() ? QString("python") : mPythonPath;
             QStringList args;
-            args << a << dumpFile;
+            args << addonFilePath << dumpFile;
             qDebug() << python << args;
 
             QProcess process;
             QProcessEnvironment env = process.processEnvironment();
-            if (!env.contains("PYTHONHOME") && !mPythonPath.isEmpty()) {
-                env.insert("PYTHONHOME", QFileInfo(mPythonPath).canonicalPath());
+            if (!env.contains("PYTHONHOME") && !python.startsWith("python")) {
+                env.insert("PYTHONHOME", QFileInfo(python).canonicalPath());
                 process.setProcessEnvironment(env);
             }
             process.start(python, args);
@@ -474,6 +477,26 @@ QString CheckThread::clangTidyCmd()
     return QString();
 }
 
+QString CheckThread::pythonCmd()
+{
+    QString path = QSettings().value(SETTINGS_PYTHON_PATH).toString();
+    if (!path.isEmpty())
+        return path;
+
+    path = "python";
+#ifdef Q_OS_WIN
+    path += ".exe";
+#endif
+
+    QProcess process;
+    process.start(path, QStringList() << "--version");
+    process.waitForFinished();
+    if (process.exitCode() == 0)
+        return path;
+
+    return QString();
+}
+
 QString CheckThread::getAddonFilePath(const QString &dataDir, const QString &addonFile)
 {
     const QStringList paths = QStringList() << "/" << "/addons/" << "/../addons/";

gui/checkthread.h

@@ -56,10 +56,6 @@ public:
         mAddonsAndTools = addonsAndTools;
     }
 
-    void setPythonPath(const QString &p) {
-        mPythonPath = p;
-    }
-
     void setDataDir(const QString &dataDir) {
         mDataDir = dataDir;
     }
@@ -81,17 +77,23 @@ public:
     void stop();
 
     /**
-     * Loop for clang and return path
-     * \return path to clang if found, empty if it is not found
+     * Determine command to run clang
+     * \return Command to run clang, empty if it is not found
      */
     static QString clangCmd();
 
     /**
-     * Loop for clang-tidy and return path
-     * \return path to clang-tidy if found, empty if it is not found
+     * Determine command to run clang-tidy
+     * \return Command to run clang-tidy, empty if it is not found
      */
     static QString clangTidyCmd();
 
+    /**
+     * Determine command to run python
+     * \return Command to run python, empty if it is not found
+     */
+    static QString pythonCmd();
+
     /**
      * Look for addon and return path
      * \return path to addon if found, empty if it is not found
@@ -143,7 +145,6 @@ private:
     QStringList mFiles;
     bool mAnalyseWholeProgram;
     QStringList mAddonsAndTools;
-    QString mPythonPath;
     QString mDataDir;
     QStringList mClangIncludePaths;
     QStringList mSuppressions;

gui/mainwindow.cpp

@@ -457,7 +457,6 @@ void MainWindow::doAnalyzeProject(ImportProject p)
     //mThread->SetanalyzeProject(true);
     if (mProjectFile) {
         mThread->setAddonsAndTools(mProjectFile->getAddonsAndTools());
-        mThread->setPythonPath(mSettings->value(SETTINGS_PYTHON_PATH).toString());
         QString clangHeaders = mSettings->value(SETTINGS_VS_INCLUDE_PATHS).toString();
         mThread->setClangIncludePaths(clangHeaders.split(";"));
         mThread->setSuppressions(mProjectFile->getSuppressions());

gui/threadhandler.cpp

@@ -94,7 +94,6 @@ void ThreadHandler::check(const Settings &settings)
 
     for (int i = 0; i < mRunningThreadCount; i++) {
         mThreads[i]->setAddonsAndTools(mAddonsAndTools);
-        mThreads[i]->setPythonPath(mPythonPath);
         mThreads[i]->setSuppressions(mSuppressions);
         mThreads[i]->setClangIncludePaths(mClangIncludePaths);
         mThreads[i]->setDataDir(mDataDir);

gui/threadhandler.h

@@ -79,10 +79,6 @@ public:
         mSuppressions = s;
     }
 
-    void setPythonPath(const QString &p) {
-        mPythonPath = p;
-    }
-
     void setClangIncludePaths(const QStringList &s) {
         mClangIncludePaths = s;
     }
@@ -259,7 +255,6 @@ protected:
 
     QStringList mAddonsAndTools;
     QStringList mSuppressions;
-    QString mPythonPath;
     QStringList mClangIncludePaths;
 
     QString mDataDir;