use empty title by default when inserting new image

src/dialog/vinsertimagedialog.cpp

@@ -13,13 +13,13 @@ VInsertImageDialog::VInsertImageDialog(const QString &title, const QString &defa
     setupUI();
 
     connect(m_imageTitleEdit, &QLineEdit::textChanged,
-            this, &VInsertImageDialog::enableOkButton);
+            this, &VInsertImageDialog::handleInputChanged);
     connect(pathEdit, &QLineEdit::textChanged,
-            this, &VInsertImageDialog::enableOkButton);
+            this, &VInsertImageDialog::handleInputChanged);
     connect(browseBtn, &QPushButton::clicked,
             this, &VInsertImageDialog::handleBrowseBtnClicked);
 
-    enableOkButton();
+    handleInputChanged();
 }
 
 VInsertImageDialog::~VInsertImageDialog()
@@ -74,17 +74,23 @@ void VInsertImageDialog::setupUI()
     m_imageTitleEdit->setFocus();
 }
 
-void VInsertImageDialog::enableOkButton()
+void VInsertImageDialog::handleInputChanged()
 {
-    QString title = m_imageTitleEdit->getEvaluatedText();
-    bool titleOk = !title.isEmpty();
-    if (titleOk) {
-        QRegExp reg(VUtils::c_imageTitleRegExp);
-        titleOk = reg.exactMatch(title);
+    bool pathOk = true;
+    if (pathEdit->isVisible() && !pathEdit->isReadOnly()) {
+        QString path = pathEdit->text();
+        if (path.isEmpty()
+            || !VUtils::checkPathLegal(path)) {
+            pathOk = false;
+        }
     }
 
+    QString title = m_imageTitleEdit->getEvaluatedText();
+    QRegExp reg(VUtils::c_imageTitleRegExp);
+    bool titleOk = reg.exactMatch(title);
+
     QPushButton *okBtn = m_btnBox->button(QDialogButtonBox::Ok);
-    okBtn->setEnabled(titleOk);
+    okBtn->setEnabled(pathOk && titleOk);
 }
 
 QString VInsertImageDialog::getImageTitleInput() const
@@ -137,7 +143,8 @@ void VInsertImageDialog::setImage(const QImage &image)
 
     imagePreviewLabel->setPixmap(pixmap);
     imagePreviewLabel->setVisible(true);
-    enableOkButton();
+
+    handleInputChanged();
 }
 
 void VInsertImageDialog::setBrowseable(bool browseable, bool visible)
@@ -148,6 +155,8 @@ void VInsertImageDialog::setBrowseable(bool browseable, bool visible)
     pathLabel->setVisible(visible);
     pathEdit->setVisible(visible);
     browseBtn->setVisible(visible);
+
+    handleInputChanged();
 }
 
 void VInsertImageDialog::imageDownloaded(const QByteArray &data)

src/dialog/vinsertimagedialog.h

@@ -31,7 +31,7 @@ public slots:
     void imageDownloaded(const QByteArray &data);
 
 private slots:
-    void enableOkButton();
+    void handleInputChanged();
     void handleBrowseBtnClicked();
 
 private:

src/utils/vutils.cpp

@@ -33,7 +33,7 @@ QVector<QPair<QString, QString>> VUtils::s_availableLanguages;
 
 const QString VUtils::c_imageLinkRegExp = QString("\\!\\[([^\\]]*)\\]\\(([^\\)\"]+)\\s*(\"(\\\\.|[^\"\\)])*\")?\\s*\\)");
 
-const QString VUtils::c_imageTitleRegExp = QString("[\\w\\(\\)@#%\\*\\-\\+=\\?<>\\,\\.\\s]+");
+const QString VUtils::c_imageTitleRegExp = QString("[\\w\\(\\)@#%\\*\\-\\+=\\?<>\\,\\.\\s]*");
 
 const QString VUtils::c_fileNameRegExp = QString("[^\\\\/:\\*\\?\"<>\\|]*");
 
@@ -106,10 +106,10 @@ QRgb VUtils::QRgbFromString(const QString &str)
     return QRgb();
 }
 
-QString VUtils::generateImageFileName(const QString &path, const QString &title,
+QString VUtils::generateImageFileName(const QString &path,
+                                      const QString &title,
                                       const QString &format)
 {
-    Q_ASSERT(!title.isEmpty());
     QRegExp regExp("\\W");
     QString baseName(title.toLower());
 
@@ -119,7 +119,9 @@ QString VUtils::generateImageFileName(const QString &path, const QString &title,
     // Constrain the length of the name.
     baseName.truncate(10);
 
-    baseName.prepend('_');
+    if (!baseName.isEmpty()) {
+        baseName.prepend('_');
+    }
 
     // Add current time and random number to make the name be most likely unique
     baseName = baseName + '_' + QString::number(QDateTime::currentDateTime().toTime_t());

src/vmdeditoperations.cpp

@@ -26,7 +26,7 @@
 
 extern VConfigManager *g_config;
 
-const QString VMdEditOperations::c_defaultImageTitle = "image";
+const QString VMdEditOperations::c_defaultImageTitle = "";
 
 VMdEditOperations::VMdEditOperations(VEdit *p_editor, VFile *p_file)
     : VEditOperations(p_editor, p_file), m_autoIndentPos(-1)