MIME preferences: Add globs and current handler name to filter

It is most useful if a user can type a file extension in the filter to find
the corresponding MIME type(s).

Also fix resetting the filter model when reopening the preferences.

Change-Id: I583e021dcdd2791288f913bc64d2be07e06ebfd3
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/coreplugin/mimetypesettings.cpp

@@ -83,9 +83,7 @@ public:
 class MimeTypeSettingsModel : public QAbstractTableModel
 {
 public:
-    enum class Role {
-        DefaultHandler = Qt::UserRole
-    };
+    enum class Role { DefaultHandler = Qt::UserRole, MimeType };
 
     MimeTypeSettingsModel(QObject *parent = nullptr)
         : QAbstractTableModel(parent) {}
@@ -158,6 +156,8 @@ QVariant MimeTypeSettingsModel::data(const QModelIndex &modelIndex, int role) co
             }
         }
         return QVariant();
+    } else if (role == int(Role::MimeType)) {
+        return QVariant::fromValue(m_mimeTypes.at(modelIndex.row()));
     }
     return QVariant();
 }
@@ -222,6 +222,37 @@ void MimeTypeSettingsModel::resetUserDefaults()
     endResetModel();
 }
 
+class MimeFilterModel : public QSortFilterProxyModel
+{
+public:
+    explicit MimeFilterModel(QObject *parent = nullptr);
+
+protected:
+    bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const override;
+};
+
+MimeFilterModel::MimeFilterModel(QObject *parent)
+    : QSortFilterProxyModel(parent)
+{
+}
+
+bool MimeFilterModel::filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
+{
+    const QModelIndex &index = sourceModel()->index(source_row, 0, source_parent);
+    const MimeType mt
+        = sourceModel()->data(index, int(MimeTypeSettingsModel::Role::MimeType)).value<MimeType>();
+    const QModelIndex &handlerIndex = sourceModel()->index(source_row, 1, source_parent);
+    const QString handlerText = sourceModel()->data(handlerIndex, Qt::DisplayRole).toString();
+
+    const QStringList matchStrings = mt.globPatterns() << mt.name() << handlerText;
+    const QRegularExpression regex = filterRegularExpression();
+    for (const QString &str : matchStrings) {
+        if (regex.match(str).hasMatch())
+            return true;
+    }
+    return false;
+}
+
 // MimeTypeSettingsPrivate
 class MimeTypeSettingsPrivate : public QObject
 {
@@ -256,7 +287,7 @@ public:
 
     static UserMimeTypeHash m_userModifiedMimeTypes; // these are already in mime database
     MimeTypeSettingsModel *m_model;
-    QSortFilterProxyModel *m_filterModel;
+    MimeFilterModel *m_filterModel;
     UserMimeTypeHash m_pendingModifiedMimeTypes; // currently edited in the options page
     QString m_filterPattern;
     QPointer<QWidget> m_widget;
@@ -277,10 +308,11 @@ MimeTypeSettingsPrivate::UserMimeTypeHash MimeTypeSettingsPrivate::m_userModifie
 
 MimeTypeSettingsPrivate::MimeTypeSettingsPrivate()
     : m_model(new MimeTypeSettingsModel(this))
-    , m_filterModel(new QSortFilterProxyModel(this))
+    , m_filterModel(new MimeFilterModel(this))
 {
     m_filterModel->setSourceModel(m_model);
     m_filterModel->setFilterKeyColumn(-1);
+    m_filterModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
     connect(ICore::instance(), &ICore::saveSettingsRequested,
             this, &MimeTypeSettingsPrivate::writeUserModifiedMimeTypes);
 }
@@ -317,6 +349,7 @@ void MimeTypeSettingsPrivate::configureUi(QWidget *w)
     auto filterLineEdit = new FancyLineEdit;
     filterLineEdit->setObjectName("filterLineEdit");
     filterLineEdit->setFiltering(true);
+    m_filterModel->setFilterWildcard({});
 
     m_mimeTypesTreeView = new QTreeView;
     m_mimeTypesTreeView->setObjectName("mimeTypesTreeView");