Compilation database: Add information to message pane

We must tell users where we generated the file, and also inform them
about errors.

Change-Id: I6383655e2f731f41b9121b2a6a31bba551d1c1de
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/plugins/clangcodemodel/clangcodemodelplugin.cpp

@@ -36,6 +36,7 @@
 
 #include <coreplugin/actionmanager/actioncontainer.h>
 #include <coreplugin/actionmanager/actionmanager.h>
+#include <coreplugin/messagemanager.h>
 #include <coreplugin/progressmanager/progressmanager.h>
 
 #include <cpptools/cppmodelmanager.h>
@@ -72,8 +73,9 @@ void ClangCodeModelPlugin::generateCompilationDB() {
     if (!project || !project->activeTarget())
         return;
 
-    QFuture<void> task = QtConcurrent::run(&Utils::generateCompilationDB,
+    QFuture<Utils::GenerateCompilationDbResult> task
-                                           CppModelManager::instance()->projectInfo(project));
+            = QtConcurrent::run(&Utils::generateCompilationDB,
+                                CppModelManager::instance()->projectInfo(project));
     Core::ProgressManager::addTask(task, tr("Generating Compilation DB"), "generate compilation db");
     m_generatorWatcher.setFuture(task);
 }
@@ -135,7 +137,17 @@ void ClangCodeModelPlugin::createCompilationDBButton()
     command->setDescription(m_generateCompilationDBAction->text());
     mbuild->addAction(command, ProjectExplorer::Constants::G_BUILD_BUILD);
 
-    connect(&m_generatorWatcher, &QFutureWatcher<void>::finished, this, [this] () {
+    connect(&m_generatorWatcher, &QFutureWatcher<Utils::GenerateCompilationDbResult>::finished,
+            this, [this] () {
+        const Utils::GenerateCompilationDbResult result = m_generatorWatcher.result();
+        QString message;
+        if (result.error.isEmpty()) {
+            message = tr("Clang compilation database generated at \"%1\".")
+                    .arg(QDir::toNativeSeparators(result.filePath));
+        } else {
+            message = tr("Generating clang compilation database failed: %1").arg(result.error);
+        }
+        Core::MessageManager::write(message, Core::MessageManager::Flash);
         m_generateCompilationDBAction->setEnabled(
                     isDBGenerationEnabled(ProjectExplorer::SessionManager::startupProject()));
     });

src/plugins/clangcodemodel/clangcodemodelplugin.h

@@ -26,6 +26,7 @@
 #pragma once
 
 #include "clangmodelmanagersupport.h"
+#include "clangutils.h"
 
 #include <extensionsystem/iplugin.h>
 
@@ -54,8 +55,8 @@ private:
     void createCompilationDBButton();
 
     ClangModelManagerSupportProvider m_modelManagerSupportProvider;
-    Utils::ParameterAction *m_generateCompilationDBAction = nullptr;
+    ::Utils::ParameterAction *m_generateCompilationDBAction = nullptr;
-    QFutureWatcher<void> m_generatorWatcher;
+    QFutureWatcher<Utils::GenerateCompilationDbResult> m_generatorWatcher;
 #ifdef WITH_TESTS
     QList<QObject *> createTestObjects() const override;
 #endif

src/plugins/clangcodemodel/clangutils.cpp

@@ -386,18 +386,22 @@ static QJsonObject createFileObject(const ::Utils::FileName &buildDir,
     return fileObject;
 }
 
-void generateCompilationDB(CppTools::ProjectInfo projectInfo)
+GenerateCompilationDbResult generateCompilationDB(CppTools::ProjectInfo projectInfo)
 {
     const ::Utils::FileName buildDir = buildDirectory(*projectInfo.project());
-    QTC_ASSERT(!buildDir.isEmpty(), return;);
+    QTC_ASSERT(!buildDir.isEmpty(), return GenerateCompilationDbResult(QString(),
+        QCoreApplication::translate("ClangUtils", "Could not retrieve build directory.")));
 
     QDir dir(buildDir.toString());
     if (!dir.exists())
         dir.mkpath(dir.path());
     QFile compileCommandsFile(buildDir.toString() + "/compile_commands.json");
     const bool fileOpened = compileCommandsFile.open(QIODevice::WriteOnly | QIODevice::Truncate);
-    if (!fileOpened)
+    if (!fileOpened) {
-        return;
+        return GenerateCompilationDbResult(QString(),
+                QCoreApplication::translate("ClangUtils", "Could not create \"%1\": %2")
+                    .arg(compileCommandsFile.fileName(), compileCommandsFile.errorString()));
+    }
     compileCommandsFile.write("[");
 
     for (ProjectPart::Ptr projectPart : projectInfo.projectParts()) {
@@ -412,6 +416,7 @@ void generateCompilationDB(CppTools::ProjectInfo projectInfo)
 
     compileCommandsFile.write("\n]");
     compileCommandsFile.close();
+    return GenerateCompilationDbResult(compileCommandsFile.fileName(), QString());
 }
 
 QString currentCppEditorDocumentFilePath()

src/plugins/clangcodemodel/clangutils.h

@@ -70,7 +70,19 @@ QString diagnosticCategoryPrefixRemoved(const QString &text);
 
 ::Utils::CodeModelIcon::Type iconTypeForToken(const ClangBackEnd::TokenInfoContainer &token);
 
-void generateCompilationDB(CppTools::ProjectInfo projectInfo);
+class GenerateCompilationDbResult
+{
+public:
+    GenerateCompilationDbResult() = default;
+    GenerateCompilationDbResult(const QString &filePath, const QString &error)
+        : filePath(filePath), error(error)
+    {}
+
+    QString filePath;
+    QString error;
+};
+
+GenerateCompilationDbResult generateCompilationDB(CppTools::ProjectInfo projectInfo);
 
 class DiagnosticTextInfo
 {