WIP REBASE ipc refactoring

Since the previous commit we don't group the results
anymore, making the vector redundant

CHANGELOG.md

@@ -1,4 +1,50 @@
 # looqs: Release notes
+## 2022-08-14 - v0.6
+This release features multiple fixes and enhancements.
+
+Bad news first: It drops a trivial trigger that appeared to work quite fine, but silently may cause "unpredictability" of the sqlite FTS5 index ( [9422a5b494](https://github.com/quitesimpleorg/looqs/commit/9422a5b494dabd0f1324dc2f92a34c3036137414) ). As a result, FTS queries may return weird and unexplainable results. This is not reasonably automatically recoverable by looqs. I strongly recommend creating a clean, new database. All previous versions are affected. To do that, go to "Settings" -> checking "Remove old database on save" -> "Save settings and restart". Alternatively, specify a new path to keep the old database.
+
+CHANGES:
+
+ - GUI: Add line numbers and context lines to plaintext previews
+ - GUI: Fix case where previews for old queries would have still been visible if new query would not create previews
+ - GUI: Add CTRL + F, CTRL+W, CTRL+Tab, CTRL+Shift+Tab shortcuts (see user manual)
+ - GUI: Add checkbox in "Settings" tab allowing to delete database.
+ - General: Fix wrong regexes that caused query errors with chars like -
+ - General: Drop trigger sending incomplete sqlite fts5 deletion command, causing undefined index behaviour
+
+## 2022-07-30 - v0.5.1
+
+CHANGES:
+
+ - gui: Fix regression in implicit paths queries introduced in previous version
+
+## 2022-07-29 - v0.5
+This release features multiple fixes and enhancements.
+
+It changes the database to drop an unused content column. Dropping it allows us
+to change to a contentless sqlite FTS index which frees up space.
+
+Upgrading might take a few seconds to a few minutes as looqs will recreate the whole index.
+How long this will take depends on the size of your database.
+
+The other major highlight is preview support for .odt files (unformatted, like plaintext).
+
+List of changes:
+
+ - General: As Ubuntu 21.10 is EOL, no looqs package will be provided for it any longer
+ - General: Update database scheme to drop unused content column and free up space
+ - General: Properly escape FTS arguments passed to sqlite to avoid query errors on some terms
+ - GUI: Fix double searches and results when explicit content search filters are provided
+ - GUI: Previews: Plaintext previews now obey scale selection too
+ - GUI: Previews: Begin basic, unformatted previews of .odt files
+ - GUI: Previews: Add file path below every preview for convenience (hovering unnecessary now).
+ - GUI: Previews: Fix bug causing an empty preview if a plaintext file started with a searched word
+ - GUI: Add menu option to open user manual
+ - GUI: Show progress dialog during database upgrade
+ - General: Correct error count in some conditions for failed paths
+ - General: Update user manual
+ - Minor improvements
 
 ## 2022-06-29 - v0.4
 This release makes several minor improvements and begins prebuilt binaries of looqs that (should) run

README.md

@@ -1,10 +1,9 @@
 # looqs - Full-text search with previews for your files
-looqs is a tool that creates a full-text search index for your files. It allows you to look at previews where your
-search terms have been found, as shown in the screenshots below.
+looqs is a tool that creates a full-text search index for your files. It allows you to look at previews where your search terms have been found, as shown in the screenshots below.
 
 ## Screenshots
 ### Preview
-looqs allow you to look inside files. It marks what you have searched for.
+looqs allows you to look inside files. It highlights what you have searched for.
 
 ![Screenshot looqs](https://garage.quitesimple.org/assets/looqs/orwell.png)
 ![Screenshot looqs search fstream](https://garage.quitesimple.org/assets/looqs/fstream_write.png)
@@ -29,7 +28,7 @@ There is no need to write the long form of filters. There are also booleans avai
 The screenshots in this section may occasionally be slightly outdated, but they are usually recent enough to get an overall impression of the current state of the GUI.
 
 ## Current status
-Latest version: 2022-06-29, v0.4
+Latest version: 2022-08-14, v0.6
 
 Please see [Changelog](CHANGELOG.md) for a human readable list of changes.
 
@@ -46,7 +45,7 @@ Please see [Changelog](CHANGELOG.md) for a human readable list of changes.
 - GUI, CLI interface
 - Indexing of file path and some metadata.
 - Indexing of file file content for FTS search. Currently: .pdf, odt, docx, plaintext.
-- Preview of file formats: Currently: .pdf, plaintext
+- Preview of file formats: Currently: .pdf, .odt, plaintext
 - Highlight searched terms.
 - Quickly open PDF viewer or text editor at location of preview
 - Search filters
@@ -68,7 +67,7 @@ Please see [USAGE.md](USAGE.md) for the user manual. There is also [HACKING.md](
 
 ## Build
 
-### Ubuntu 21.10/22.04
+### Debian/Ubuntu
 
 To build on Ubuntu and Debian, clone the repo and then run:
 ```
@@ -95,7 +94,7 @@ The GUI is located in `gui/looqs-gui`, the binary for the CLI is in `cli/looqs`
 ## Packages
 At this point, looqs is not in any official distro package repo, but I maintain some packages.
 
-### Ubuntu 21.10/22.04
+### Ubuntu 22.04
 Latest release can be installed using apt from the repo.
 ```
 # First, obtain key, assume it's trusted.

USAGE.md

@@ -9,15 +9,13 @@ looqs is still at an early stage and may exhibit some weirdness and contain bugs
 ## Current Limitations and things to know
 You should be aware of the following:
 
-- It may seem natural, but the GUI and CLI operate on the same database, so if you add files using the CLI, the GUI will search them too.
+- Lags are to be expected for networked mount points such as SMB and NFS etc.
+
+- It may seem natural, but the GUI and CLI operate on the same database, so if you add files using the CLI, the GUI will know about them too.
 
 - If a file is listed in the "Search results" tab, it does not imply that a preview will be available in the "Previews" tab, as looqs can search more file formats than it can generate previews for currently.
 
-- Database paths are stored inefficiently, not deduplicated to simplify queries. This may add up quickly. Also, each PDF text is stored twice. Each page separately + the whole document to simplify queries.
-To give you some idea: At the time this section was written, 167874 files were in my index. A FTS index was built for 14280 of those, of which 4146 were PDF documents. The PDFs take around 10GB storage space on the filesystem. All files for which an FTS has been built are around 7GB in size on the filesystem. The looqs database had a size of 1.6 GB.
-
-- Existing files are considered modified when the mtime has changed. looqs currently does not check whether the content
-has changed. 
+- Existing files are considered modified when the modification time has changed. looqs currently does not check whether the content has changed.
 
 ## Config
 The config file is in `$HOME/.config/quitesimple.org/looqs.conf`. It will be created on first execution of the CLI or GUI interface. Generally, you should not edit this file directly. Instead, use the "Settings" tab in the GUI.
@@ -30,25 +28,34 @@ Database default path: `$HOME/.local/share/quitesimple.org/looqs/looqs.sqlite`.
 ### First run
 You will be presented with an empty list. Go to the **"Index"** tab, add some directories and click **"Start indexing"**.
 
+### Indexing
 For large directories the progress bar is essentially just decoration. As long as you see the counters
 increase, everything is fine even if it seems the progress bar is stuck.
 
 The indexing can be stopped. If you run it again you do not start from scratch, because looqs knows
-which files have been modified or not since they have been added to the index. Thus, files will
-only be reprocedded when necessary. Note that cancellation itself may take a moment as files finish processing. 
+which files have been modified since they have been added to the index. Thus, files will
+only be reprocessed when necessary. Note that cancellation itself may take a moment as files finish processing.
+
+The counters increase in batches, therefore it's normal that it seems no progress is being made, particularly when processing lots of large documents. This aspect will be improved in a future version.
 
 ### Search
-The text field at the top is where you type your query. It can be selected quickly using **CTRL + L**. Filters are avalable,
-see this document at the end. By default, both the full path and the content are searched. Path names take precedence.
+The text field at the top is where you type your query. It can be selected quickly using **CTRL + L**. Filters are available, see this document at the end. By default, both the full path and the content are searched. Path names take precedence, i. e. they will appear the top of the list.
+
+**CTRL + F**: This is helpful shortcut if you want to perform several searches. Consider the following
+query: "p:(docs) c:(invoice credit card)". Press CTRL+F to highlight 'invoice credit card'. This way
+you can quickly perform content searches in paths containing 'docs'.
+
+**CTRL + W**: Removes the last filter. If we take above's example "p:(docs) c:(invoice credit card)" again, then CTRL + W kills "c:(invoice credit card)".
 
 ### Configuring PDF viewer
 It's most convenient if, when you click on a preview, the PDF reader opens the page you clicked. For that, looqs needs to know which viewer you want to launch.
 
-It tries to auto detect some common viewers. You must set the value in the "Settings" tab yourself if it doesn't do something you like, such as not opening your favorite viewer. In the command line options, "%f" represents the filepath, "%p" the page number.
+It tries to auto detect some common viewers. You must set the value in the "Settings" tab yourself if the
+default does not work for you. In the command line options, "%f" represents the filepath, "%p" the page number.
 
 ### Preview tab
 The preview tab shows previews. It marks your search keywords too. Click on a preview to open the file.
-A right click on a preview allows you to copy the file path, or to open the containing folder. Hovering tells you which file the preview originates from.
+A right click on a preview allows you to copy the file path, or to open the containing folder.
 
 ### Syncing index
 Over time, files get deleted or their content changes. Go to **looqs** -> **Sync index**. looqs will reindex the content of files which have been changed. Files that cannot be found anymore will be removed from the index.
@@ -81,12 +88,11 @@ There is an implicit "AND" condition, meaning if you search for "photo" and "mou
 will be shown containing both terms, but not either alone.
 
 ### Deletion and Fixing Out of sync index
-You sometimes delete files, to get rid of those from the index too, run:
+To get rid of deleted files from the index, run:
 
 ```
 looqs delete --deleted --dry-run
 ```
-
 This commands lists all files which are indexed, but which cannot be found anymore.
 
 Remove them using:
@@ -122,13 +128,13 @@ looqs update
 ```
 
 This will not add new files, you must run ```looqs add``` for this. For this reason, most users
-will probably seldomly use the 'update' command alone.
+will probably seldom use the 'update' command alone.
 
 
 ## Tips
 
 ### Keeping index up to date
-The most obvious way is to use the GUI and add your favorite paths in the "Index" tab. Then occasionally, just rescan. This works for me personally, looqs quickly picks up new files. This however may not be good enough for some users.
+The most obvious way is to use the GUI to add your favorite paths in the "Index" tab. Then occasionally, just rescan. This works for me personally, looqs quickly picks up new files. This however may not be good enough for some users.
 
 Some users may prefer setting up cronjobs or wire up the CLI interface with file system monitoring tools such as [adhocify](https://github.com/quitesimpleorg/adhocify).
 
@@ -140,20 +146,20 @@ are indexed by looqs, you may find the lh (look here) alias useful:
 alias lh='looqs search $(pwd)'
 ```
 
-So typing "lh recipes" searchs the current dir and its subdirs for a file containing 'recipes'.
+So typing "lh recipes" searches the current dir and its subdirs for a file containing 'recipes'. Alternatively, a "lh c:(rice)" may be a quick grep alternative.
 
 ## Query syntax / Search filters
 A number of search filters are available.
 
 | Filter (long) |  Filter (short) | Explanation |
 | ----------- | ----------- |----------- |
-| path.contains:(term) | p:(term) | Pretty much a SQL LIKE '%term%' conditions, just searches the path string |
+| path.contains:(term) | p:(term) | Pretty much a SQL LIKE '%term%' condition, just searches the path string |
 | path.ends:(term) | pe:(term) | Filters path ending with the specified term, e. g.: pe:(.ogg) |
 | path.begins:(term) | pb:(term) |  Filters path beginning with the specified term |
-| contains:(terms) | c:(terms) | ull-text search, also understands quotes | 
-
-Filters can be combined. The booleans AND and OR are supported. Negations can be applied too, except for c:(). 
-The AND boolean is implicit and thus entering it strictly optional. 
+| contains:(terms) | c:(terms) | Full-text search, also understands quotes |
+| limit:(integer) | - | Limits the number of results. The default is 1000. Say "limit:0" to see all results |
+Filters can be combined. The booleans AND and OR are supported. Negations can be applied too, except for c:(). Negations are specified with "!".
+The AND boolean is implicit and thus entering it strictly optional.
 
 Examples:
 
@@ -162,8 +168,10 @@ Examples:
 |pe:(.ogg) p:(marley)| Finds paths that end with .ogg and contain 'marley' (case-insensitive)
 |p:(slides) support vector machine           |Performs a content search for 'support vector machine' in all paths containing 'slides'|
 |p:(notes) (pe:(odt) OR pe:(docx))          |Finds files such as notes.docx, notes.odt but also any .docs and .odt when the path contains the string 'notes'|
-|memcpy !(pe:(.c) OR pe:(.cpp))| Performs a FTS search for 'memcpy' but excludes .cpp and .c files. 
-|c:("I think, therefore")|Performs a FTS search for the phrase "I think, therefore". 
+|memcpy !(pe:(.c) OR pe:(.cpp))| Performs a FTS search for 'memcpy' but excludes .cpp and .c files.|
+|c:("I think, therefore")|Performs a FTS search for the phrase "I think, therefore".|
+|c:("invoice") Downloads|This query is equivalent to c:("invoice") p:("Downloads")|
+
 
 
 

cli/commandsearch.cpp

@@ -33,11 +33,18 @@ int CommandSearch::handle(QStringList arguments)
 
 	try
 	{
+
+		QHash<QString, bool> seenMap;
 		auto results = dbService->search(query);
 
-		for(SearchResult &result : results)
+		for(const SearchResult &result : results)
 		{
-			Logger::info() << result.fileData.absPath << Qt::endl;
+			const QString &absPath = result.fileData.absPath;
+			if(!seenMap.contains(absPath))
+			{
+				seenMap[absPath] = true;
+				Logger::info() << absPath << Qt::endl;
+			}
 		}
 	}
 	catch(LooqsGeneralException &e)

cli/main.cpp

@@ -26,6 +26,7 @@
 #include "sandboxedprocessor.h"
 #include "../shared/common.h"
 #include "../shared/filescanworker.h"
+#include "../shared/dbmigrator.h"
 
 void printUsage(QString argv0)
 {
@@ -75,6 +76,27 @@ int main(int argc, char *argv[])
 	try
 	{
 		Common::ensureConfigured();
+
+		DatabaseFactory factory{Common::databasePath()};
+		DBMigrator migrator{factory};
+		if(migrator.migrationNeeded())
+		{
+			Logger::info() << "Database is being upgraded, please be patient..." << Qt::endl;
+
+			QObject::connect(&migrator, &DBMigrator::migrationDone,
+							 [&](uint32_t migration)
+							 { Logger::info() << "Progress: Successfully migrated to: " << migration << Qt::endl; });
+			QObject::connect(&migrator, &DBMigrator::done,
+							 []() { Logger::info() << "Database upgrade successful" << Qt::endl; });
+			QObject::connect(&migrator, &DBMigrator::error,
+							 [&](QString error)
+							 {
+								 Logger::error() << error << Qt::endl;
+								 qApp->quit();
+							 });
+
+			migrator.performMigrations();
+		}
 	}
 	catch(LooqsGeneralException &e)
 	{

gui/gui.pro

@@ -36,9 +36,11 @@ SOURCES += \
       clicklabel.cpp \
     previewgenerator.cpp \
     previewgeneratormapfunctor.cpp \
+    previewgeneratorodt.cpp \
     previewgeneratorpdf.cpp \
     previewgeneratorplaintext.cpp \
     previewresult.cpp \
+    previewresultodt.cpp \
     previewresultpdf.cpp \
     previewresultplaintext.cpp \
     renderconfig.cpp \
@@ -54,9 +56,11 @@ HEADERS += \
     clicklabel.h \
     previewgenerator.h \
     previewgeneratormapfunctor.h \
+    previewgeneratorodt.h \
     previewgeneratorpdf.h \
     previewgeneratorplaintext.h \
     previewresult.h \
+    previewresultodt.h \
     previewresultpdf.h \
     previewresultplaintext.h \
     renderconfig.h \
@@ -66,6 +70,7 @@ FORMS += \
         mainwindow.ui
 
 INCLUDEPATH += /usr/include/poppler/qt5/
+INCLUDEPATH += /usr/include/quazip5
 
 QT += widgets sql
 

gui/ipcpreviewworker.cpp

@@ -1,16 +1,50 @@
 #include <QtConcurrent>
 #include "ipcpreviewworker.h"
 #include "previewgeneratormapfunctor.h"
-IPCPreviewWorker::IPCPreviewWorker()
+IPCPreviewWorker::IPCPreviewWorker(QLocalSocket *peer)
 {
+	this->peer = peer;
 	this->connect(&previewWorkerWatcher, &QFutureWatcher<QByteArray>::resultReadyAt, this,
-				  [this](int index) { emit previewGenerated(previewWorkerWatcher.resultAt(index)); });
-	connect(&previewWorkerWatcher, &QFutureWatcher<QByteArray>::finished, this, [this] { emit finished(); });
+				  [this](int index)
+				  {
+					  if(this->peer != nullptr)
+					  {
+						  QDataStream stream{this->peer};
+						  stream << previewWorkerWatcher.resultAt(index);
+						  this->peer->flush();
+					  }
+				  });
+	connect(&previewWorkerWatcher, &QFutureWatcher<QByteArray>::finished, this, &IPCPreviewWorker::shutdownSocket);
+	connect(this->peer, &QLocalSocket::disconnected, this, &IPCPreviewWorker::shutdownSocket);
 }
 
-void IPCPreviewWorker::start(RenderConfig config, const QVector<RenderTarget> &targets, QLocalSocket *peer)
+void IPCPreviewWorker::shutdownSocket()
+{
+	if(cleaned)
+	{
+		return;
+	}
+	cleaned = true;
+	if(this->peer != nullptr)
+	{
+		if(this->peer->state() == QLocalSocket::ConnectedState)
+		{
+			this->peer->flush();
+			this->peer->waitForBytesWritten();
+			this->peer->disconnectFromServer();
+			if(this->peer->state() != QLocalSocket::UnconnectedState)
+			{
+				this->peer->waitForDisconnected();
+			}
+		}
+		delete this->peer;
+		this->peer = nullptr;
+	}
+	emit finished();
+}
+
+void IPCPreviewWorker::start(RenderConfig config, const QVector<RenderTarget> &targets)
 {
-	stop();
 	auto mapFunctor = PreviewGeneratorMapFunctor();
 	mapFunctor.setRenderConfig(config);
 

gui/ipcpreviewworker.h

@@ -11,13 +11,17 @@ class IPCPreviewWorker : public QObject
 	Q_OBJECT
   private:
 	QFutureWatcher<QByteArray> previewWorkerWatcher;
+	QLocalSocket *peer;
+	bool cleaned = false;
 
   public:
-	IPCPreviewWorker();
-	void start(RenderConfig config, const QVector<RenderTarget> &targets, QLocalSocket *peer);
+	IPCPreviewWorker(QLocalSocket *peer);
+	void start(RenderConfig config, const QVector<RenderTarget> &targets);
 	void stop();
+  private slots:
+	void shutdownSocket();
+
   signals:
-	void previewGenerated(QByteArray);
 	void finished();
 };
 

gui/ipcserver.cpp

@@ -18,8 +18,6 @@ IpcServer::IpcServer()
 	/* Only 1, we are doing work for the GUI, not a service for general availability */
 	this->spawningServer.setMaxPendingConnections(1);
 	connect(&this->spawningServer, &QLocalServer::newConnection, this, &IpcServer::spawnerNewConnection);
-	connect(&this->previewWorker, &IPCPreviewWorker::previewGenerated, this, &IpcServer::handlePreviewGenerated);
-	connect(&this->previewWorker, &IPCPreviewWorker::finished, this, [this] { this->currentSocket->flush(); });
 }
 
 bool IpcServer::startSpawner(QString socketPath)
@@ -31,8 +29,6 @@ bool IpcServer::startSpawner(QString socketPath)
 void IpcServer::spawnerNewConnection()
 {
 	QLocalSocket *socket = this->spawningServer.nextPendingConnection();
-	connect(socket, &QLocalSocket::disconnected, socket, &QLocalSocket::deleteLater);
-	this->currentSocket = socket;
 	if(socket != nullptr)
 	{
 		if(!socket->waitForReadyRead())
@@ -53,21 +49,22 @@ void IpcServer::spawnerNewConnection()
 				stream.startTransaction();
 				stream >> renderConfig >> targets;
 			} while(!stream.commitTransaction() && socket->state() == QLocalSocket::ConnectedState);
-
-			stream << targets.count();
-			socket->flush();
-			previewWorker.start(renderConfig, targets, socket);
+			if(socket->state() == QLocalSocket::ConnectedState)
+			{
+				stream << targets.count();
+				socket->flush();
+				IPCPreviewWorker *previewWorker = new IPCPreviewWorker(socket);
+				connect(previewWorker, &IPCPreviewWorker::finished, this, [previewWorker] { delete previewWorker; });
+				previewWorker->start(renderConfig, targets);
+			}
+			else
+			{
+				delete socket;
+			}
 		}
 		if(command == StopGeneratePreviews)
 		{
-			previewWorker.stop();
+			/* TODO: implement */
 		}
 	}
 }
-
-void IpcServer::handlePreviewGenerated(QByteArray ba)
-{
-	QDataStream stream{this->currentSocket};
-	stream << ba;
-	this->currentSocket->flush();
-}

gui/ipcserver.h

@@ -10,13 +10,10 @@ class IpcServer : public QObject
 {
 	Q_OBJECT
   private:
-	IPCPreviewWorker previewWorker;
 	QLocalServer spawningServer;
-	QLocalSocket *currentSocket = nullptr;
 	SaveFileResult addFile(QString file);
   private slots:
 	void spawnerNewConnection();
-	void handlePreviewGenerated(QByteArray ba);
 
   public:
 	IpcServer();

gui/main.cpp

@@ -12,6 +12,8 @@
 #include "previewresultpdf.h"
 #include "../shared/common.h"
 #include "../shared/sandboxedprocessor.h"
+#include "../shared/dbmigrator.h"
+#include "../shared/logger.h"
 #include "../submodules/exile.h/exile.h"
 #include "ipcserver.h"
 
@@ -153,6 +155,63 @@ int main(int argc, char *argv[])
 	try
 	{
 		Common::ensureConfigured();
+		DatabaseFactory factory{Common::databasePath()};
+		DBMigrator migrator{factory};
+
+		if(migrator.migrationNeeded())
+		{
+			auto answer = QMessageBox::question(nullptr, "Proceed with upgrade?",
+												"A database upgrade is required. This might take a few minutes. Say "
+												"'yes' to start upgrade, 'no' to exit.");
+
+			if(answer == QMessageBox::No)
+			{
+				a.quit();
+				return 0;
+			}
+
+			QFile out;
+			out.open(stderr, QIODevice::WriteOnly);
+			Logger migrationLogger{&out};
+			migrationLogger << "Database is being upgraded, please be patient..." << Qt::endl;
+			QThread migratorThread;
+			migrator.moveToThread(&migratorThread);
+			migratorThread.start();
+			QProgressDialog progressDialog;
+
+			QObject::connect(&migrator, &DBMigrator::migrationDone,
+							 [&migrationLogger](uint32_t migration)
+							 { migrationLogger << "Progress: Successfully migrated to: " << migration << Qt::endl; });
+			QObject::connect(&migrator, &DBMigrator::done, &progressDialog, &QProgressDialog::reset);
+			QObject::connect(&migrator, &DBMigrator::error,
+							 [&](QString error)
+							 {
+								 QMetaObject::invokeMethod(qApp,
+														   [error]
+
+														   {
+															   Logger::error() << error << Qt::endl;
+															   QMessageBox::critical(nullptr, "Error during upgrade",
+																					 error);
+															   qApp->quit();
+														   }
+
+								 );
+							 });
+			QTimer::singleShot(0, &migrator, &DBMigrator::start);
+
+			progressDialog.setWindowTitle("Upgrading database");
+			progressDialog.setLabelText("Upgrading database - this might take several minutes, please wait");
+			progressDialog.setWindowModality(Qt::ApplicationModal);
+			progressDialog.setMinimum(0);
+			progressDialog.setMaximum(0);
+			progressDialog.setValue(0);
+			progressDialog.setCancelButton(nullptr);
+			progressDialog.exec();
+
+			migrationLogger << "Database has been successfully upgraded" << Qt::endl;
+			migratorThread.quit();
+		}
 	}
 	catch(LooqsGeneralException &e)
 	{

gui/mainwindow.cpp

@@ -33,28 +33,6 @@ MainWindow::MainWindow(QWidget *parent, QString socketPath)
 	setWindowTitle(QCoreApplication::applicationName());
 	this->ipcPreviewClient.moveToThread(&this->ipcClientThread);
 	this->ipcPreviewClient.setSocketPath(socketPath);
-
-	connect(&ipcPreviewClient, &IPCPreviewClient::previewReceived, this, &MainWindow::previewReceived,
-			Qt::QueuedConnection);
-	connect(&ipcPreviewClient, &IPCPreviewClient::finished, this,
-			[&]
-			{
-				this->ui->previewProcessBar->setValue(this->ui->previewProcessBar->maximum());
-				this->ui->spinPreviewPage->setEnabled(true);
-				this->ui->comboPreviewFiles->setEnabled(true);
-			});
-	connect(&ipcPreviewClient, &IPCPreviewClient::error, this,
-			[this](QString msg)
-			{
-				qCritical() << msg << Qt::endl;
-				QMessageBox::critical(this, "IPC error", msg);
-			});
-
-	connect(this, &MainWindow::startIpcPreviews, &ipcPreviewClient, &IPCPreviewClient::startGeneration,
-			Qt::QueuedConnection);
-	connect(this, &MainWindow::stopIpcPreviews, &ipcPreviewClient, &IPCPreviewClient::stopGeneration,
-			Qt::QueuedConnection);
-	this->ipcClientThread.start();
 	QSettings settings;
 
 	this->dbFactory = new DatabaseFactory(Common::databasePath());
@@ -82,6 +60,10 @@ MainWindow::MainWindow(QWidget *parent, QString socketPath)
 	QString ignorePatterns = settings.value("ignorePatterns").toString();
 	ui->txtIgnorePatterns->setText(ignorePatterns);
 
+	QStringList searchHistoryList = settings.value(SETTINGS_KEY_SEARCHHISTORY).toStringList();
+	this->searchHistory = searchHistoryList.toVector();
+	this->currentSearchHistoryIndex = this->searchHistory.size();
+
 	ui->spinPreviewPage->setValue(1);
 	ui->spinPreviewPage->setMinimum(1);
 
@@ -91,6 +73,11 @@ MainWindow::MainWindow(QWidget *parent, QString socketPath)
 	auto policy = ui->btnOpenFailed->sizePolicy();
 	policy.setRetainSizeWhenHidden(true);
 	ui->btnOpenFailed->setSizePolicy(policy);
+
+	ui->txtSearch->installEventFilter(this);
+	ui->scrollArea->viewport()->installEventFilter(this);
+
+	this->ipcClientThread.start();
 }
 
 void MainWindow::addPathToIndex()
@@ -191,6 +178,9 @@ void MainWindow::connectSignals()
 	connect(ui->menuAboutQtAction, &QAction::triggered, this,
 			[this](bool checked) { QMessageBox::aboutQt(this, "About Qt"); });
 	connect(ui->menuSyncIndexAction, &QAction::triggered, this, &MainWindow::startIndexSync);
+	connect(ui->menuOpenUserManualAction, &QAction::triggered, this,
+			[this]() { QDesktopServices::openUrl(Common::userManualUrl()); });
+
 	connect(indexSyncer, &IndexSyncer::finished, this,
 			[&](unsigned int totalUpdated, unsigned int totalDeleted, unsigned int totalErrored)
 			{
@@ -208,8 +198,36 @@ void MainWindow::connectSignals()
 	connect(ui->btnSaveSettings, &QPushButton::clicked, this, &MainWindow::saveSettings);
 	connect(ui->btnOpenFailed, &QPushButton::clicked, this, &MainWindow::exportFailedPaths);
 	connect(
-		ui->comboPreviewFiles, qOverload<int>(&QComboBox::currentIndexChanged), this, [&]() { makePreviews(1); },
+		ui->comboPreviewFiles, qOverload<int>(&QComboBox::currentIndexChanged), this,
+		[&]()
+		{
+			if(this->previewTabActive())
+			{
+				makePreviews(1);
+			}
+		},
 		Qt::QueuedConnection);
+	connect(&ipcPreviewClient, &IPCPreviewClient::previewReceived, this, &MainWindow::previewReceived,
+			Qt::QueuedConnection);
+	connect(&ipcPreviewClient, &IPCPreviewClient::finished, this,
+			[&]
+			{
+				this->ui->previewProcessBar->setValue(this->ui->previewProcessBar->maximum());
+				this->ui->spinPreviewPage->setEnabled(true);
+				this->ui->comboPreviewFiles->setEnabled(true);
+				ui->txtSearch->setEnabled(true);
+			});
+	connect(&ipcPreviewClient, &IPCPreviewClient::error, this,
+			[this](QString msg)
+			{
+				qCritical() << msg << Qt::endl;
+				QMessageBox::critical(this, "IPC error", msg);
+			});
+
+	connect(this, &MainWindow::startIpcPreviews, &ipcPreviewClient, &IPCPreviewClient::startGeneration,
+			Qt::QueuedConnection);
+	connect(this, &MainWindow::stopIpcPreviews, &ipcPreviewClient, &IPCPreviewClient::stopGeneration,
+			Qt::QueuedConnection);
 }
 
 void MainWindow::exportFailedPaths()
@@ -338,6 +356,182 @@ bool MainWindow::indexerTabActive()
 	return ui->tabWidget->currentIndex() == 2;
 }
 
+void MainWindow::processShortcut(int key)
+{
+	if(key == Qt::Key_Tab || key == Qt::Key_Backtab)
+	{
+		int tabIndex = ui->tabWidget->currentIndex();
+		if(key == Qt::Key_Tab)
+		{
+			++tabIndex;
+		}
+		if(key == Qt::Key_Backtab)
+		{
+			--tabIndex;
+		}
+		tabIndex = tabIndex % ui->tabWidget->count();
+		if(tabIndex < 0)
+		{
+			tabIndex = ui->tabWidget->count() - 1;
+		}
+		ui->tabWidget->setCurrentIndex(tabIndex);
+	}
+	if(key == Qt::Key_L)
+	{
+		ui->txtSearch->setFocus();
+		ui->txtSearch->selectAll();
+	}
+	if(key == Qt::Key_W)
+	{
+		ui->txtSearch->setFocus();
+		QString currentText = ui->txtSearch->text().trimmed();
+		int index = currentText.lastIndexOf(QRegularExpression("[\\s\\)]"));
+		if(index != -1)
+		{
+			bool isFilter = (index == currentText.length() - 1);
+			currentText.remove(index + 1, currentText.length() - index - 1);
+			if(isFilter)
+			{
+				index = currentText.lastIndexOf(' ', index);
+				if(index == -1)
+				{
+					index = 0;
+				}
+				currentText.remove(index, currentText.length());
+			}
+			if(currentText.length() > 0)
+			{
+				currentText += ' ';
+			}
+			ui->txtSearch->setText(currentText);
+		}
+		else
+		{
+			ui->txtSearch->clear();
+		}
+	}
+	if(key == Qt::Key_F)
+	{
+		ui->txtSearch->setFocus();
+		QString currentText = ui->txtSearch->text().trimmed();
+		int index = currentText.lastIndexOf(')');
+		if(index != -1)
+		{
+			bool isFilter = (index == currentText.length() - 1);
+			if(!isFilter)
+			{
+				ui->txtSearch->setSelection(index + 2, ui->txtSearch->text().length() - index - 1);
+			}
+			else
+			{
+				int begin = currentText.lastIndexOf('(', index - 1);
+				if(begin != -1)
+				{
+					ui->txtSearch->setSelection(begin + 1, index - begin - 1);
+				}
+			}
+		}
+		else
+		{
+			int spaceIndex = currentText.lastIndexOf(' ');
+			int colonIndex = currentText.lastIndexOf(':');
+			if(colonIndex > spaceIndex)
+			{
+				int target = currentText.indexOf(' ', colonIndex);
+				if(target == -1)
+				{
+					target = ui->txtSearch->text().size() - colonIndex;
+				}
+				ui->txtSearch->setSelection(colonIndex + 1, target - 1);
+			}
+			else
+			{
+				ui->txtSearch->setSelection(spaceIndex + 1, ui->txtSearch->text().size() - spaceIndex - 1);
+			}
+		}
+	}
+}
+
+bool MainWindow::eventFilter(QObject *object, QEvent *event)
+{
+	if(object == ui->txtSearch && !searchHistory.empty())
+	{
+		if(event->type() == QEvent::KeyPress)
+		{
+			QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
+			if(keyEvent->key() == Qt::Key_Up)
+			{
+				if(this->currentSavedSearchText.isEmpty())
+				{
+					this->currentSavedSearchText = ui->txtSearch->text();
+				}
+				if(this->currentSearchHistoryIndex <= 0)
+				{
+					return true;
+				}
+				--this->currentSearchHistoryIndex;
+				QString text = this->searchHistory.at(this->currentSearchHistoryIndex);
+				ui->txtSearch->setText(text);
+				return true;
+			}
+			else if(keyEvent->key() == Qt::Key_Down)
+			{
+				if(this->currentSearchHistoryIndex == searchHistory.size() - 1)
+				{
+					if(!this->currentSavedSearchText.isEmpty())
+					{
+						ui->txtSearch->setText(this->currentSavedSearchText);
+						this->currentSavedSearchText.clear();
+						++this->currentSearchHistoryIndex;
+					}
+					return true;
+				}
+				if(this->currentSearchHistoryIndex < searchHistory.size() - 1)
+				{
+					++this->currentSearchHistoryIndex;
+					QString text = this->searchHistory.at(this->currentSearchHistoryIndex);
+					ui->txtSearch->setText(text);
+				}
+				return true;
+			}
+			else
+			{
+				this->currentSavedSearchText.clear();
+				/* Off by one on purpose so Key_Up decrements it again and lands at
+				 * the last entry */
+				this->currentSearchHistoryIndex = this->searchHistory.size();
+			}
+		}
+	}
+	if(object == ui->scrollArea->viewport())
+	{
+		if(event->type() == QEvent::Wheel)
+		{
+			QWheelEvent *wheelEvent = static_cast<QWheelEvent *>(event);
+			if(wheelEvent->modifiers() & Qt::ControlModifier)
+			{
+				if(wheelEvent->angleDelta().y() > 0)
+				{
+					if(ui->comboScale->currentIndex() < ui->comboScale->count() - 1)
+					{
+						ui->comboScale->setCurrentIndex(ui->comboScale->currentIndex() + 1);
+					}
+				}
+
+				else
+				{
+					if(ui->comboScale->currentIndex() > 0)
+					{
+						ui->comboScale->setCurrentIndex(ui->comboScale->currentIndex() - 1);
+					}
+				}
+				return true;
+			}
+		}
+	}
+	return QMainWindow::eventFilter(object, event);
+}
+
 void MainWindow::keyPressEvent(QKeyEvent *event)
 {
 	bool quit =
@@ -345,17 +539,15 @@ void MainWindow::keyPressEvent(QKeyEvent *event)
 	if(quit)
 	{
 		qApp->quit();
+		return;
 	}
 
 	if(event->modifiers() & Qt::ControlModifier)
 	{
-
-		if(event->key() == Qt::Key_L)
-		{
-			ui->txtSearch->setFocus();
-			ui->txtSearch->selectAll();
-		}
+		processShortcut(event->key());
+		return;
 	}
+
 	QWidget::keyPressEvent(event);
 }
 
@@ -401,10 +593,24 @@ void MainWindow::initSettingsTabs()
 	ui->txtSettingMountPaths->setText(mountPaths);
 	ui->spinSettingNumerPerPages->setValue(numPagesPerPreview);
 	ui->txtSettingDatabasePath->setText(databasePath);
+	bool horizontalScroll = settings.value(SETTINGS_KEY_PREVIEWS_SCROLL_HORIZONTALLY).toBool();
+	ui->radioScrollHorizontally->setChecked(horizontalScroll);
+	ui->radioScrollVertically->setChecked(!horizontalScroll);
 }
 
 void MainWindow::saveSettings()
 {
+	if(ui->chkRemoveOldDb->isChecked())
+	{
+		bool result = QFile::remove(Common::databasePath());
+		if(!result)
+		{
+			QMessageBox::critical(this, "Error removing database",
+								  "Failed to remove old database. Settings not saved.");
+			return;
+		}
+	}
+
 	QSettings settings;
 
 	QString pdfViewerCmd = ui->txtSettingPdfPreviewerCmd->text();
@@ -417,6 +623,7 @@ void MainWindow::saveSettings()
 	settings.setValue(SETTINGS_KEY_MOUNTPATHS, mountPaths);
 	settings.setValue(SETTINGS_KEY_PREVIEWSPERPAGE, ui->spinSettingNumerPerPages->value());
 	settings.setValue(SETTINGS_KEY_DBPATH, databasePath);
+	settings.setValue(SETTINGS_KEY_PREVIEWS_SCROLL_HORIZONTALLY, ui->radioScrollHorizontally->isChecked());
 
 	settings.sync();
 
@@ -436,19 +643,46 @@ void MainWindow::previewReceived(QSharedPointer<PreviewResult> preview, unsigned
 		QString docPath = preview->getDocumentPath();
 		auto previewPage = preview->getPage();
 
+		ClickLabel *headerLabel = new ClickLabel();
+		headerLabel->setText(QString("Path: ") + preview->getDocumentPath());
+
 		ClickLabel *label = dynamic_cast<ClickLabel *>(preview->createPreviewWidget());
-		ui->scrollAreaWidgetContents->layout()->addWidget(label);
-		connect(label, &ClickLabel::leftClick, [this, docPath, previewPage]() { openDocument(docPath, previewPage); });
-		connect(label, &ClickLabel::rightClick,
-				[this, docPath, previewPage]()
-				{
-					QFileInfo fileInfo{docPath};
-					QMenu menu("labeRightClick", this);
-					createSearchResutlMenu(menu, fileInfo);
-					menu.addAction("Copy page number", [previewPage]
-								   { QGuiApplication::clipboard()->setText(QString::number(previewPage)); });
-					menu.exec(QCursor::pos());
-				});
+
+		QVBoxLayout *previewLayout = new QVBoxLayout();
+
+		QFont font = label->font();
+		font.setPointSize(QApplication::font().pointSize() * currentSelectedScale() / 100);
+		label->setFont(font);
+		headerLabel->setFont(font);
+
+		auto leftClickHandler = [this, docPath, previewPage]() { openDocument(docPath, previewPage); };
+		auto rightClickhandler = [this, docPath, previewPage]()
+		{
+			QFileInfo fileInfo{docPath};
+			QMenu menu("labeRightClick", this);
+			createSearchResutlMenu(menu, fileInfo);
+			menu.addAction("Copy page number",
+						   [previewPage] { QGuiApplication::clipboard()->setText(QString::number(previewPage)); });
+			menu.exec(QCursor::pos());
+		};
+
+		connect(label, &ClickLabel::leftClick, leftClickHandler);
+		connect(label, &ClickLabel::rightClick, rightClickhandler);
+
+		connect(headerLabel, &ClickLabel::rightClick, rightClickhandler);
+
+		previewLayout->addWidget(label);
+
+		previewLayout->addWidget(headerLabel);
+
+		previewLayout->setMargin(0);
+		previewLayout->insertStretch(0, 1);
+		previewLayout->insertStretch(-1, 1);
+		QWidget *previewWidget = new QWidget();
+
+		previewWidget->setLayout(previewLayout);
+
+		ui->scrollAreaWidgetContents->layout()->addWidget(previewWidget);
 	}
 }
 
@@ -465,6 +699,14 @@ void MainWindow::lineEditReturnPressed()
 		ui->tabWidget->setCurrentIndex(0);
 	}
 	// TODO: validate q;
+	while(this->searchHistory.size() > 30)
+	{
+		this->searchHistory.removeFirst();
+	}
+	this->searchHistory.append(q);
+	this->currentSearchHistoryIndex = this->searchHistory.size();
+	this->currentSavedSearchText.clear();
+
 	ui->treeResultsList->clear();
 	ui->lblSearchResults->setText("Searching...");
 	this->ui->txtSearch->setEnabled(false);
@@ -473,21 +715,70 @@ void MainWindow::lineEditReturnPressed()
 		{
 			SqliteSearch searcher(db);
 			QVector<SearchResult> results;
-			this->contentSearchQuery = LooqsQuery::build(q, TokenType::FILTER_CONTENT_CONTAINS, true);
+			LooqsQuery tmpQuery = LooqsQuery::build(q, TokenType::WORD, true);
 
-			/* We can have a path search in contentsearch too (if given explicitly), so no need to do it twice.
-				Make sure path results are listed first. */
-			bool addContentSearch = this->contentSearchQuery.hasContentSearch();
-			bool addPathSearch = !this->contentSearchQuery.hasPathSearch() || !addContentSearch;
+			LooqsQuery pathsQuery = tmpQuery;
+
+			this->contentSearchQuery = tmpQuery;
+
+			bool addContentSearch = false;
+			bool addPathSearch = false;
+
+			auto createFinalTokens = [&tmpQuery](TokenType replacementToken)
+			{
+				QVector<Token> tokens = tmpQuery.getTokens();
+				for(Token &token : tokens)
+				{
+					if(token.type == TokenType::WORD)
+					{
+						token.type = replacementToken;
+					}
+				}
+				return tokens;
+			};
+
+			/* An explicit search, no lone words. We just pass it on */
+			if(!(tmpQuery.getTokensMask() & TokenType::WORD))
+			{
+				if(tmpQuery.hasContentSearch())
+				{
+					addContentSearch = true;
+				}
+				else
+				{
+					addPathSearch = true;
+				}
+			}
+			/* A path search, and lone words, e. g. p:("docs") invoice */
+			else if(tmpQuery.hasPathSearch() && (tmpQuery.getTokensMask() & TokenType::WORD))
+			{
+				this->contentSearchQuery = tmpQuery;
+				this->contentSearchQuery.setTokens(createFinalTokens(TokenType::FILTER_CONTENT_CONTAINS));
+				addContentSearch = true;
+				addPathSearch = false;
+			}
+			/* A content search and lone words, e. g. c:("to be or not") ebooks */
+			else if(tmpQuery.hasContentSearch() && (tmpQuery.getTokensMask() & TokenType::WORD))
+			{
+				this->contentSearchQuery = LooqsQuery::build(q, TokenType::FILTER_PATH_CONTAINS, false);
+				addContentSearch = true;
+				addPathSearch = false;
+			}
+			/* "Simply lone words, so search both" */
+			else if(!tmpQuery.hasPathSearch() && !tmpQuery.hasContentSearch())
+			{
+				this->contentSearchQuery.setTokens(createFinalTokens(TokenType::FILTER_CONTENT_CONTAINS));
+				pathsQuery = LooqsQuery::build(q, TokenType::FILTER_PATH_CONTAINS, false);
+				addContentSearch = true;
+				addPathSearch = true;
+			}
 			if(addPathSearch)
 			{
-				LooqsQuery filesQuery = LooqsQuery::build(q, TokenType::FILTER_PATH_CONTAINS, false);
-				if(filesQuery.getLimit() == -1)
+				if(pathsQuery.getLimit() == -1)
 				{
-					filesQuery.setLimit(1000);
+					pathsQuery.setLimit(1000);
 				}
-
-				results.append(searcher.search(filesQuery));
+				results.append(searcher.search(pathsQuery));
 			}
 			if(addContentSearch)
 			{
@@ -495,9 +786,12 @@ void MainWindow::lineEditReturnPressed()
 				{
 					this->contentSearchQuery.setLimit(1000);
 				}
-
 				results.append(searcher.search(this->contentSearchQuery));
 			}
+			else
+			{
+				this->contentSearchQuery.setTokens({});
+			}
 			return results;
 		});
 	searchWatcher.setFuture(searchFuture);
@@ -506,25 +800,33 @@ void MainWindow::lineEditReturnPressed()
 void MainWindow::handleSearchResults(const QVector<SearchResult> &results)
 {
 	this->previewableSearchResults.clear();
+	qDeleteAll(ui->scrollAreaWidgetContents->children());
+
 	ui->treeResultsList->clear();
 	ui->comboPreviewFiles->clear();
 	ui->comboPreviewFiles->addItem("All previews");
 	ui->comboPreviewFiles->setVisible(true);
 
 	bool hasDeleted = false;
+	QHash<QString, bool> seenMap;
 	for(const SearchResult &result : results)
 	{
-		QFileInfo pathInfo(result.fileData.absPath);
+		const QString &absPath = result.fileData.absPath;
+		QFileInfo pathInfo(absPath);
 
-		QString fileName = pathInfo.fileName();
-		QTreeWidgetItem *item = new QTreeWidgetItem(ui->treeResultsList);
+		if(!seenMap.contains(absPath))
+		{
+			seenMap[absPath] = true;
+			QString fileName = pathInfo.fileName();
+			QTreeWidgetItem *item = new QTreeWidgetItem(ui->treeResultsList);
 
-		QDateTime dt = QDateTime::fromSecsSinceEpoch(result.fileData.mtime);
-		item->setIcon(0, iconProvider.icon(pathInfo));
-		item->setText(0, fileName);
-		item->setText(1, result.fileData.absPath);
-		item->setText(2, dt.toString(Qt::ISODate));
-		item->setText(3, this->locale().formattedDataSize(result.fileData.size));
+			QDateTime dt = QDateTime::fromSecsSinceEpoch(result.fileData.mtime);
+			item->setIcon(0, iconProvider.icon(pathInfo));
+			item->setText(0, fileName);
+			item->setText(1, absPath);
+			item->setText(2, dt.toString(Qt::ISODate));
+			item->setText(3, this->locale().formattedDataSize(result.fileData.size));
+		}
 		bool exists = pathInfo.exists();
 		if(exists)
 		{
@@ -547,6 +849,7 @@ void MainWindow::handleSearchResults(const QVector<SearchResult> &results)
 			hasDeleted = true;
 		}
 	}
+
 	ui->treeResultsList->resizeColumnToContents(0);
 	ui->treeResultsList->resizeColumnToContents(1);
 	ui->treeResultsList->resizeColumnToContents(2);
@@ -567,6 +870,13 @@ void MainWindow::handleSearchResults(const QVector<SearchResult> &results)
 	ui->lblSearchResults->setText(statusText);
 }
 
+int MainWindow::currentSelectedScale()
+{
+	QString scaleText = ui->comboScale->currentText();
+	scaleText.chop(1);
+	return scaleText.toInt();
+}
+
 void MainWindow::makePreviews(int page)
 {
 	if(this->previewableSearchResults.empty())
@@ -575,14 +885,22 @@ void MainWindow::makePreviews(int page)
 	}
 	qDeleteAll(ui->scrollAreaWidgetContents->children());
 
-	ui->scrollAreaWidgetContents->setLayout(new QHBoxLayout());
+	QSettings settings;
+	bool horizontalScroll = settings.value(SETTINGS_KEY_PREVIEWS_SCROLL_HORIZONTALLY, false).toBool();
+	if(horizontalScroll)
+	{
+		ui->scrollAreaWidgetContents->setLayout(new QHBoxLayout());
+	}
+	else
+	{
+		ui->scrollAreaWidgetContents->setLayout(new QVBoxLayout());
+		ui->scrollAreaWidgetContents->layout()->setAlignment(Qt::AlignCenter);
+	}
 	ui->previewProcessBar->setMaximum(this->previewableSearchResults.size());
 	processedPdfPreviews = 0;
-	QString scaleText = ui->comboScale->currentText();
-	scaleText.chop(1);
 
 	QVector<QString> wordsToHighlight;
-	QRegularExpression extractor(R"#("([^"]*)"|((\p{L}|\p{N})+))#");
+	QRegularExpression extractor(R"#("([^"]*)"|([^\s]+))#");
 	for(const Token &token : this->contentSearchQuery.getTokens())
 	{
 		if(token.type == FILTER_CONTENT_CONTAINS)
@@ -608,9 +926,10 @@ void MainWindow::makePreviews(int page)
 		begin = 0;
 	}
 
+	int currentScale = currentSelectedScale();
 	RenderConfig renderConfig;
-	renderConfig.scaleX = QGuiApplication::primaryScreen()->physicalDotsPerInchX() * (scaleText.toInt() / 100.);
-	renderConfig.scaleY = QGuiApplication::primaryScreen()->physicalDotsPerInchY() * (scaleText.toInt() / 100.);
+	renderConfig.scaleX = QGuiApplication::primaryScreen()->physicalDotsPerInchX() * (currentScale / 100.);
+	renderConfig.scaleY = QGuiApplication::primaryScreen()->physicalDotsPerInchY() * (currentScale / 100.);
 	renderConfig.wordsToHighlight = wordsToHighlight;
 
 	QVector<RenderTarget> targets;
@@ -625,12 +944,8 @@ void MainWindow::makePreviews(int page)
 		}
 		RenderTarget renderTarget;
 		renderTarget.path = sr.fileData.absPath;
-
-		for(unsigned int pagenum : sr.pages)
-		{
-			renderTarget.page = (int)pagenum;
-			targets.append(renderTarget);
-		}
+		renderTarget.page = (int)sr.page;
+		targets.append(renderTarget);
 	}
 	int numpages = ceil(static_cast<double>(targets.size()) / previewsPerPage);
 	ui->spinPreviewPage->setMaximum(numpages);
@@ -644,6 +959,7 @@ void MainWindow::makePreviews(int page)
 	++this->currentPreviewGeneration;
 	this->ui->spinPreviewPage->setEnabled(false);
 	this->ui->comboPreviewFiles->setEnabled(false);
+	this->ui->txtSearch->setEnabled(false);
 	emit startIpcPreviews(renderConfig, targets);
 }
 
@@ -730,3 +1046,11 @@ MainWindow::~MainWindow()
 	delete this->indexer;
 	delete ui;
 }
+
+void MainWindow::closeEvent(QCloseEvent *event)
+{
+	QStringList list = this->searchHistory.toList();
+	QSettings settings;
+	settings.setValue(SETTINGS_KEY_SEARCHHISTORY, list);
+	settings.sync();
+}

gui/mainwindow.h

@@ -30,6 +30,9 @@ class MainWindow : public QMainWindow
 	void beginSearch(const QString &query);
 	void startPdfPreviewGeneration(QVector<SearchResult> paths, double scalefactor);
 
+  protected:
+	void closeEvent(QCloseEvent *event) override;
+
   private:
 	DatabaseFactory *dbFactory;
 	SqliteDbService *dbService;
@@ -62,6 +65,12 @@ class MainWindow : public QMainWindow
 	void openFile(QString path);
 	unsigned int currentPreviewGeneration = 1;
 	void initSettingsTabs();
+	int currentSelectedScale();
+	void processShortcut(int key);
+	bool eventFilter(QObject *object, QEvent *event);
+	QVector<QString> searchHistory;
+	int currentSearchHistoryIndex = 0;
+	QString currentSavedSearchText;
   private slots:
 	void lineEditReturnPressed();
 	void treeSearchItemActivated(QTreeWidgetItem *item, int i);

gui/mainwindow.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>1280</width>
-    <height>855</height>
+    <height>888</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -27,7 +27,7 @@
        <enum>QTabWidget::South</enum>
       </property>
       <property name="currentIndex">
-       <number>1</number>
+       <number>3</number>
       </property>
       <widget class="QWidget" name="resultsTab">
        <attribute name="title">
@@ -82,7 +82,7 @@
              <x>0</x>
              <y>0</y>
              <width>1244</width>
-             <height>565</height>
+             <height>598</height>
             </rect>
            </property>
            <layout class="QHBoxLayout" name="horizontalLayout"/>
@@ -532,9 +532,29 @@
            <item>
             <widget class="QLineEdit" name="txtSettingDatabasePath"/>
            </item>
+           <item>
+            <widget class="QCheckBox" name="chkRemoveOldDb">
+             <property name="text">
+              <string>Remove old database on save</string>
+             </property>
+            </widget>
+           </item>
           </layout>
          </widget>
         </item>
+        <item>
+         <spacer name="verticalSpacer">
+          <property name="orientation">
+           <enum>Qt::Vertical</enum>
+          </property>
+          <property name="sizeHint" stdset="0">
+           <size>
+            <width>20</width>
+            <height>40</height>
+           </size>
+          </property>
+         </spacer>
+        </item>
         <item>
          <widget class="QGroupBox" name="Misc">
           <property name="title">
@@ -544,7 +564,7 @@
            <item>
             <layout class="QHBoxLayout" name="horizontalLayout_9">
              <item>
-              <widget class="QLabel" name="label_4">
+              <widget class="QLabel" name="lblMaxNumbersPreviewPages">
                <property name="text">
                 <string>Max number of previews per 'page' in 'Previews' tab: </string>
                </property>
@@ -568,22 +588,47 @@
              </item>
             </layout>
            </item>
+           <item>
+            <layout class="QHBoxLayout" name="horizontalLayout_8">
+             <item>
+              <widget class="QLabel" name="lblScrollModeForPreviews">
+               <property name="text">
+                <string>Scroll mode for previews:</string>
+               </property>
+              </widget>
+             </item>
+             <item>
+              <widget class="QRadioButton" name="radioScrollVertically">
+               <property name="text">
+                <string>Vertically</string>
+               </property>
+              </widget>
+             </item>
+             <item>
+              <widget class="QRadioButton" name="radioScrollHorizontally">
+               <property name="text">
+                <string>Horizontally</string>
+               </property>
+              </widget>
+             </item>
+             <item>
+              <spacer name="horizontalSpacer_6">
+               <property name="orientation">
+                <enum>Qt::Horizontal</enum>
+               </property>
+               <property name="sizeHint" stdset="0">
+                <size>
+                 <width>40</width>
+                 <height>20</height>
+                </size>
+               </property>
+              </spacer>
+             </item>
+            </layout>
+           </item>
           </layout>
          </widget>
         </item>
-        <item>
-         <spacer name="verticalSpacer">
-          <property name="orientation">
-           <enum>Qt::Vertical</enum>
-          </property>
-          <property name="sizeHint" stdset="0">
-           <size>
-            <width>20</width>
-            <height>40</height>
-           </size>
-          </property>
-         </spacer>
-        </item>
         <item>
          <widget class="QPushButton" name="btnSaveSettings">
           <property name="text">
@@ -626,6 +671,7 @@
      <string>looqs</string>
     </property>
     <addaction name="menuSyncIndexAction"/>
+    <addaction name="menuOpenUserManualAction"/>
     <addaction name="menuAboutAction"/>
     <addaction name="menuAboutQtAction"/>
     <addaction name="separator"/>
@@ -647,6 +693,11 @@
     <string>Sync index (remove deleted, update existing files)</string>
    </property>
   </action>
+  <action name="menuOpenUserManualAction">
+   <property name="text">
+    <string>Open user manual</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <resources/>

gui/previewgenerator.cpp

@@ -2,13 +2,15 @@
 #include "previewgenerator.h"
 #include "previewgeneratorpdf.h"
 #include "previewgeneratorplaintext.h"
+#include "previewgeneratorodt.h"
 
 static PreviewGenerator *plainTextGenerator = new PreviewGeneratorPlainText();
 
 static QMap<QString, PreviewGenerator *> generators{
 	{"pdf", new PreviewGeneratorPdf()}, {"txt", plainTextGenerator},  {"md", plainTextGenerator},
 	{"py", plainTextGenerator},			{"java", plainTextGenerator}, {"js", plainTextGenerator},
-	{"cpp", plainTextGenerator},		{"c", plainTextGenerator},	  {"sql", plainTextGenerator}};
+	{"cpp", plainTextGenerator},		{"c", plainTextGenerator},	  {"sql", plainTextGenerator},
+	{"odt", new PreviewGeneratorOdt()}};
 
 PreviewGenerator *PreviewGenerator::get(QFileInfo &info)
 {

gui/previewgeneratorodt.cpp

@@ -0,0 +1,32 @@
+#include <quazip.h>
+#include <quazipfile.h>
+#include "previewgeneratorplaintext.h"
+#include "previewgeneratorodt.h"
+#include "previewresultodt.h"
+#include "../shared/tagstripperprocessor.h"
+
+QSharedPointer<PreviewResult> PreviewGeneratorOdt::generate(RenderConfig config, QString documentPath,
+															unsigned int page)
+{
+	PreviewResultOdt *result = new PreviewResultOdt(documentPath, page);
+
+	QFileInfo info{documentPath};
+
+	QuaZipFile zipFile(documentPath);
+	zipFile.setFileName("content.xml");
+	if(!zipFile.open(QIODevice::ReadOnly))
+	{
+		return QSharedPointer<PreviewResult>(result);
+	}
+	QByteArray entireContent = zipFile.readAll();
+	if(entireContent.isEmpty())
+	{
+		throw LooqsGeneralException("Error while reading content.xml of " + documentPath);
+	}
+	TagStripperProcessor tsp;
+	QString content = tsp.process(entireContent).first().content;
+
+	PreviewGeneratorPlainText plainTextGenerator;
+	result->setText(plainTextGenerator.generatePreviewText(content, config, info.fileName()));
+	return QSharedPointer<PreviewResult>(result);
+}

gui/previewgeneratorodt.h

@@ -0,0 +1,12 @@
+#ifndef PREVIEWGENERATORODT_H
+#define PREVIEWGENERATORODT_H
+
+#include "previewgenerator.h"
+class PreviewGeneratorOdt : public PreviewGenerator
+{
+  public:
+	using PreviewGenerator::PreviewGenerator;
+
+	QSharedPointer<PreviewResult> generate(RenderConfig config, QString documentPath, unsigned int page);
+};
+#endif // PREVIEWGENERATORODT_H

gui/previewgeneratorplaintext.cpp

@@ -2,35 +2,26 @@
 
 #include "previewgeneratorplaintext.h"
 #include "previewresultplaintext.h"
+#include "../shared/limitqueue.h"
 
-QSharedPointer<PreviewResult> PreviewGeneratorPlainText::generate(RenderConfig config, QString documentPath,
-																  unsigned int page)
+QString PreviewGeneratorPlainText::generatePreviewText(QString content, RenderConfig config, QString fileName)
 {
-	PreviewResultPlainText *result = new PreviewResultPlainText(documentPath, page);
-	QFile file(documentPath);
-	if(!file.open(QFile::ReadOnly | QFile::Text))
-	{
-		return QSharedPointer<PreviewResultPlainText>(result);
-	}
-	QTextStream in(&file);
-
 	QString resulText = "";
-	QString content = in.readAll();
+
 	QMap<int, QString> snippet;
 
-	int coveredRange = 0;
+	int coveredRange = -1;
+	int lastWordPos = -1;
 
-	int lastWordPos = 0;
 	QHash<QString, int> countmap;
 
-	const unsigned int maxSnippets = 7;
 	unsigned int currentSnippets = 0;
 	for(QString &word : config.wordsToHighlight)
 	{
 
 		int lastPos = 0;
 		int index = content.indexOf(word, lastPos, Qt::CaseInsensitive);
-		while(index != -1 && currentSnippets < maxSnippets)
+		while(index != -1 && currentSnippets < MAX_SNIPPETS)
 		{
 			countmap[word] = countmap.value(word, 0) + 1;
 
@@ -66,25 +57,110 @@ QSharedPointer<PreviewResult> PreviewGeneratorPlainText::generate(RenderConfig c
 		++i;
 	}
 
+	QString header = "<b>" + fileName + "</b> ";
 	for(QString &word : config.wordsToHighlight)
 	{
 		resulText.replace(word, "<span style=\"background-color: yellow;\">" + word + "</span>", Qt::CaseInsensitive);
-	}
-
-	QFileInfo info{documentPath};
-
-	QString header = "<b>" + info.fileName() + "</b> ";
-	for(QString &word : config.wordsToHighlight)
-	{
 		header += word + ": " + QString::number(countmap[word]) + " ";
 	}
-	if(currentSnippets == maxSnippets)
+
+	if(currentSnippets == MAX_SNIPPETS)
 	{
 		header += "(truncated)";
 	}
 
 	header += "<hr>";
 
-	result->setText(header + resulText.replace("\n", "<br>").mid(0, 1000));
+	return header + resulText.replace("\n", "<br>").mid(0, 1000);
+}
+
+QString PreviewGeneratorPlainText::generateLineBasedPreviewText(QTextStream &in, RenderConfig config, QString fileName)
+{
+	QString resultText;
+	const unsigned int contextLinesCount = 2;
+	LimitQueue<QString> queue(contextLinesCount);
+	QString currentLine;
+	currentLine.reserve(512);
+
+	/* How many lines to read after a line with a match (like grep -A ) */
+	int justReadLinesCount = -1;
+
+	auto appendLine = [&resultText](int lineNumber, QString &line)
+	{ resultText.append(QString("<b>%1</b>%2<br>").arg(lineNumber).arg(line)); };
+
+	QHash<QString, int> countmap;
+	QString header = "<b>" + fileName + "</b> ";
+
+	unsigned int snippetsCount = 0;
+	unsigned int lineCount = 0;
+	while(in.readLineInto(&currentLine) && snippetsCount < MAX_SNIPPETS)
+	{
+		++lineCount;
+		bool matched = false;
+		if(justReadLinesCount > 0)
+		{
+			appendLine(lineCount, currentLine);
+			--justReadLinesCount;
+			continue;
+		}
+		if(justReadLinesCount == 0)
+		{
+			resultText += "---<br>";
+			justReadLinesCount = -1;
+			++snippetsCount;
+		}
+		for(QString &word : config.wordsToHighlight)
+		{
+			if(currentLine.contains(word, Qt::CaseInsensitive))
+			{
+				countmap[word] = countmap.value(word, 0) + 1;
+				matched = true;
+				currentLine.replace(word, "<span style=\"background-color: yellow;\">" + word + "</span>",
+									Qt::CaseInsensitive);
+			}
+		}
+		if(matched)
+		{
+			while(queue.size() > 0)
+			{
+				int queuedLineCount = lineCount - queue.size();
+				QString queuedLine = queue.dequeue();
+
+				appendLine(queuedLineCount, queuedLine);
+			}
+			appendLine(lineCount, currentLine);
+			justReadLinesCount = contextLinesCount;
+		}
+		else
+		{
+			queue.enqueue(currentLine);
+		}
+	}
+
+	for(QString &word : config.wordsToHighlight)
+	{
+		header += word + ": " + QString::number(countmap[word]) + " ";
+	}
+	if(snippetsCount == MAX_SNIPPETS)
+	{
+		header += "(truncated)";
+	}
+	header += "<hr>";
+
+	return header + resultText;
+}
+
+QSharedPointer<PreviewResult> PreviewGeneratorPlainText::generate(RenderConfig config, QString documentPath,
+																  unsigned int page)
+{
+	PreviewResultPlainText *result = new PreviewResultPlainText(documentPath, page);
+	QFile file(documentPath);
+	if(!file.open(QFile::ReadOnly | QFile::Text))
+	{
+		return QSharedPointer<PreviewResultPlainText>(result);
+	}
+	QTextStream in(&file);
+	QFileInfo info{documentPath};
+	result->setText(generateLineBasedPreviewText(in, config, info.fileName()));
 	return QSharedPointer<PreviewResultPlainText>(result);
 }

gui/previewgeneratorplaintext.h

@@ -1,11 +1,17 @@
 #ifndef PREVIEWGENERATORPLAINTEXT_H
 #define PREVIEWGENERATORPLAINTEXT_H
+#include <QTextStream>
 #include "previewgenerator.h"
 
 class PreviewGeneratorPlainText : public PreviewGenerator
 {
+  protected:
+	const unsigned int MAX_SNIPPETS = 7;
+
   public:
 	using PreviewGenerator::PreviewGenerator;
+	QString generatePreviewText(QString content, RenderConfig config, QString fileName);
+	QString generateLineBasedPreviewText(QTextStream &in, RenderConfig config, QString fileName);
 	QSharedPointer<PreviewResult> generate(RenderConfig config, QString documentPath, unsigned int page);
 };
 

gui/previewresultodt.cpp

@@ -0,0 +1 @@
+#include "previewresultodt.h"

gui/previewresultodt.h

@@ -0,0 +1,10 @@
+#ifndef PREVIEWRESULTODT_H
+#define PREVIEWRESULTODT_H
+#include "previewresultplaintext.h"
+
+class PreviewResultOdt : public PreviewResultPlainText
+{
+	using PreviewResultPlainText::PreviewResultPlainText;
+};
+
+#endif // PREVIEWRESULTODT_H

shared/common.cpp

@@ -22,46 +22,29 @@ inline void initResources()
 
 bool Common::initSqliteDatabase(QString path)
 {
-	QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
-	db.setDatabaseName(path);
-	if(!db.open())
+	try
 	{
-		qDebug() << "failed to open database: " << path;
+		initResources();
+		DatabaseFactory factory(path);
+		DBMigrator migrator{factory};
+		migrator.performMigrations();
+	}
+	catch(std::exception &ex)
+	{
+		Logger::error() << "Failed to init dabase: " << ex.what();
 		return false;
 	}
-	initResources();
-	DBMigrator migrator{db};
-	migrator.performMigrations();
-	db.close();
 	return true;
 }
 
-QString Common::findInPath(QString needle)
-{
-	QStringList results;
-	QString pathVar = QProcessEnvironment::systemEnvironment().value("PATH", "/usr/bin/:/bin/:");
-	QStringList paths = pathVar.split(":");
-	for(const QString &path : paths)
-	{
-		// TODO: can pass ../ but so be it for now.
-
-		QFileInfo info{path + "/" + needle};
-		if(info.exists())
-		{
-			return info.absoluteFilePath();
-		}
-	}
-	return "";
-}
-
 void Common::setPdfViewer()
 {
 	QString value;
 
 	/* TODO: well, we should query this probably from xdg*/
-	QString okularPath = findInPath("okular");
-	QString evincePath = findInPath("evince");
-	QString qpdfviewPath = findInPath("qpdfview");
+	QString okularPath = QStandardPaths::findExecutable("okular");
+	QString evincePath = QStandardPaths::findExecutable("evince");
+	QString qpdfviewPath = QStandardPaths::findExecutable("qpdfview");
 
 	if(okularPath != "")
 	{
@@ -76,9 +59,9 @@ void Common::setPdfViewer()
 		value = qpdfviewPath + " %f#%p";
 	}
 
-	QSettings settings;
 	if(value != "")
 	{
+		QSettings settings;
 		settings.setValue(SETTINGS_KEY_PDFVIEWER, value);
 	}
 }
@@ -107,21 +90,6 @@ void Common::ensureConfigured()
 		}
 		settings.setValue(SETTINGS_KEY_DBPATH, dbpath);
 	}
-	DatabaseFactory factory{dbpath};
-	auto db = factory.forCurrentThread();
-	DBMigrator migrator{db};
-	if(migrator.migrationNeeded())
-	{
-		QFile out;
-		out.open(stderr, QIODevice::WriteOnly);
-		Logger migrationLogger{&out};
-		migrationLogger << "Database is being upgraded, please be patient..." << Qt::endl;
-		QObject::connect(&migrator, &DBMigrator::migrationDone,
-						 [&migrationLogger](uint32_t migration)
-						 { migrationLogger << "Progress: Successfully migrated to: " << migration << Qt::endl; });
-		migrator.performMigrations();
-		migrationLogger << "Database upgraded successfully" << Qt::endl;
-	}
 	QVariant pdfViewer = settings.value(SETTINGS_KEY_PDFVIEWER);
 	if(!pdfViewer.isValid())
 	{
@@ -234,3 +202,8 @@ QString Common::versionText()
 	QString tag = GIT_TAG;
 	return tag + " (" + commitid + ") built " + __DATE__ + " " + __TIME__;
 }
+
+QString Common::userManualUrl()
+{
+	return QString("https://github.com/quitesimpleorg/looqs/blob/%1/USAGE.md").arg(QString(GIT_COMMIT_ID));
+}

shared/common.h

@@ -9,6 +9,8 @@
 #define SETTINGS_KEY_EXCLUDEDPATHS "excludedpaths"
 #define SETTINGS_KEY_MOUNTPATHS "mountpaths"
 #define SETTINGS_KEY_PREVIEWSPERPAGE "previewsPerPage"
+#define SETTINGS_KEY_SEARCHHISTORY "searchhistory"
+#define SETTINGS_KEY_PREVIEWS_SCROLL_HORIZONTALLY "horizontalscroll"
 
 namespace Common
 {
@@ -16,7 +18,6 @@ void setupAppInfo();
 QString databasePath();
 QString ipcSocketPath();
 void setPdfViewer();
-QString findInPath(QString needle);
 bool initSqliteDatabase(QString path);
 void ensureConfigured();
 QStringList excludedPaths();
@@ -25,5 +26,6 @@ bool isTextFile(QFileInfo fileInfo);
 bool isMountPath(QString path);
 bool noSandboxModeRequested();
 QString versionText();
+QString userManualUrl();
 } // namespace Common
 #endif

shared/dbmigrator.cpp

@@ -6,10 +6,10 @@
 #include "dbmigrator.h"
 #include "looqsgeneralexception.h"
 
-DBMigrator::DBMigrator(QSqlDatabase &db)
+DBMigrator::DBMigrator(DatabaseFactory &factory)
 {
 	Q_INIT_RESOURCE(migrations);
-	this->db = &db;
+	this->dbFactory = &factory;
 }
 
 DBMigrator::~DBMigrator()
@@ -30,7 +30,8 @@ QStringList DBMigrator::getMigrationFilenames()
 
 uint32_t DBMigrator::currentRevision()
 {
-	QSqlQuery dbquery(*db);
+	QSqlDatabase db = dbFactory->forCurrentThread();
+	QSqlQuery dbquery(db);
 	dbquery.exec("PRAGMA user_version;");
 	if(!dbquery.next())
 	{
@@ -48,38 +49,56 @@ bool DBMigrator::migrationNeeded()
 	return currentRev < static_cast<uint32_t>(migrations.size());
 }
 
+void DBMigrator::start()
+{
+	performMigrations();
+}
+
 void DBMigrator::performMigrations()
 {
 	QStringList migrations = getMigrationFilenames();
 	uint32_t currentRev = currentRevision();
 	uint32_t targetRev = (migrations.size());
 
-	for(uint32_t i = currentRev + 1; i <= targetRev; i++)
-	{
-		QString fileName = QString(":/looqs-migrations/%1.sql").arg(i);
-		QFile file{fileName};
-		if(!file.open(QIODevice::ReadOnly))
-		{
-			throw LooqsGeneralException("Migration: Failed to find required revision file");
-		}
-		QTextStream stream(&file);
-		db->transaction();
-		while(!stream.atEnd())
-		{
-			QString sql = stream.readLine();
-			QSqlQuery sqlQuery{*db};
-			if(!sqlQuery.exec(sql))
-			{
+	QSqlDatabase db = dbFactory->forCurrentThread();
 
-				db->rollback();
-				throw LooqsGeneralException("Failed to execute sql statement while initializing database: " +
-											sqlQuery.lastError().text());
+	try
+	{
+		for(uint32_t i = currentRev + 1; i <= targetRev; i++)
+		{
+			QString fileName = QString(":/looqs-migrations/%1.sql").arg(i);
+			QFile file{fileName};
+			if(!file.open(QIODevice::ReadOnly))
+			{
+				throw LooqsGeneralException("Migration: Failed to find required revision file");
 			}
+			QTextStream stream(&file);
+			db.transaction();
+			while(!stream.atEnd())
+			{
+				QString sql = stream.readLine();
+				QSqlQuery sqlQuery{db};
+				if(!sqlQuery.exec(sql))
+				{
+
+					db.rollback();
+					throw LooqsGeneralException("Failed to execute sql statement while initializing database: " +
+												sqlQuery.lastError().text());
+				}
+			}
+			QSqlQuery updateVersion{db};
+			updateVersion.exec(QString("PRAGMA user_version=%1;").arg(i));
+			db.commit();
+
+			QSqlQuery vacuumQuery{db};
+			vacuumQuery.exec("VACUUM;");
+
+			emit migrationDone(i);
 		}
-		QSqlQuery updateVersion{*db};
-		updateVersion.exec(QString("PRAGMA user_version=%1;").arg(i));
-		db->commit();
-		emit migrationDone(i);
+		emit done();
+	}
+	catch(LooqsGeneralException &e)
+	{
+		emit error(e.message);
 	}
-	emit done();
 }

shared/dbmigrator.h

@@ -3,14 +3,15 @@
 #include <QStringList>
 #include <QSqlDatabase>
 #include <QObject>
+#include "databasefactory.h"
 class DBMigrator : public QObject
 {
 	Q_OBJECT
   private:
-	QSqlDatabase *db;
+	DatabaseFactory *dbFactory;
 
   public:
-	DBMigrator(QSqlDatabase &db);
+	DBMigrator(DatabaseFactory &dbFactory);
 	~DBMigrator();
 	uint32_t currentRevision();
 	void performMigrations();
@@ -19,6 +20,9 @@ class DBMigrator : public QObject
   signals:
 	void migrationDone(uint32_t);
 	void done();
+	void error(QString e);
+  public slots:
+	void start();
 };
 
 #endif // DBMIGRATOR_H

shared/indexer.cpp

@@ -120,7 +120,7 @@ void Indexer::dirScanProgress(int current, int total)
 
 void Indexer::processFileScanResult(FileScanResult result)
 {
-	if(result.second != OK || result.second != OK_WASEMPTY || result.second != SKIPPED)
+	if(isErrorSaveFileResult(result.second))
 	{
 		this->currentIndexResult.results.append(result);
 		if(!keepGoing)

shared/limitqueue.h

@@ -0,0 +1,48 @@
+#ifndef LIMITQUEUE_H
+#define LIMITQUEUE_H
+#include <QQueue>
+
+template <class T> class LimitQueue
+{
+  protected:
+	QQueue<T> queue;
+	unsigned int limit = 0;
+
+  public:
+	LimitQueue();
+	LimitQueue(unsigned int limit)
+	{
+		this->limit = limit;
+	}
+
+	void enqueue(const T &t)
+	{
+		if(queue.size() == limit)
+		{
+			queue.dequeue();
+		}
+		queue.enqueue(t);
+	}
+
+	int size()
+	{
+		return queue.size();
+	}
+
+	T dequeue()
+	{
+		return queue.dequeue();
+	}
+
+	void setLimit(unsigned int limit)
+	{
+		this->limit = limit;
+	}
+
+	void clear()
+	{
+		queue.clear();
+	}
+};
+
+#endif // LIMITQUEUE_H

shared/looqsquery.cpp

@@ -180,9 +180,8 @@ LooqsQuery LooqsQuery::build(QString expression, TokenType loneWordsTokenType, b
 
 	QStringList loneWords;
 	LooqsQuery result;
-	QRegularExpression rx(
-		"((?<filtername>(\\.|\\w)+):(?<args>\\((?<innerargs>[^\\)]+)\\)|([\\p{L}\\p{N},])+)|(?<boolean>AND|OR)"
-		"|(?<negation>!)|(?<bracket>\\(|\\))|(?<loneword>[\"\\p{L}\\p{N}]+))");
+	QRegularExpression rx("((?<filtername>(\\.|\\w)+):(?<args>\\((?<innerargs>[^\\)]+)\\)|([^\\s])+)|(?<boolean>AND|OR)"
+						  "|(?<negation>!)|(?<bracket>\\(|\\))|(?<loneword>[^\\s]+))");
 	QRegularExpressionMatchIterator i = rx.globalMatch(expression);
 	auto previousWasBool = [&result] { return !result.tokens.empty() && ((result.tokens.last().type & BOOL) == BOOL); };
 	auto previousWas = [&result](TokenType t) { return !result.tokens.empty() && (result.tokens.last().type == t); };
@@ -320,7 +319,7 @@ LooqsQuery LooqsQuery::build(QString expression, TokenType loneWordsTokenType, b
 	QVector<Token> newTokens;
 
 	TokenType prevType = BOOL_AND;
-	int needsBoolean = FILTER_CONTENT | FILTER_PATH | NEGATION;
+	int needsBoolean = FILTER_CONTENT | FILTER_PATH | NEGATION | WORD;
 	for(Token &t : result.tokens)
 	{
 		if(t.type == BRACKET_OPEN || t.type & needsBoolean)

shared/looqsquery.h

@@ -44,6 +44,13 @@ class LooqsQuery
 	QVector<Token> tokens;
 	QVector<SortCondition> sortConditions;
 	void addToken(Token t);
+	void updateTokensMask()
+	{
+		for(const Token &t : tokens)
+		{
+			this->tokensMask |= t.type;
+		}
+	}
 
   public:
 	const QVector<Token> &getTokens() const;
@@ -65,8 +72,34 @@ class LooqsQuery
 	bool hasPathSearch() const;
 
 	void addSortCondition(SortCondition sc);
+
+	void setTokens(const QVector<Token> &tokens)
+	{
+		this->tokens = tokens;
+		updateTokensMask();
+	}
+
 	static bool checkParanthesis(QString query);
 	static LooqsQuery build(QString query, TokenType loneWordsTokenType, bool mergeLoneWords);
+
+	LooqsQuery()
+	{
+	}
+
+	LooqsQuery(const QVector<Token> &tokens, const QVector<SortCondition> &sortConditions)
+	{
+		this->tokens = tokens;
+		this->sortConditions = sortConditions;
+		updateTokensMask();
+	}
+
+	LooqsQuery(const LooqsQuery &o)
+	{
+		this->tokens = o.tokens;
+		this->sortConditions = o.sortConditions;
+		this->tokensMask = o.tokensMask;
+		this->limit = o.limit;
+	}
 };
 
 #endif // LOOQSQUERY_H

shared/migrations/2.sql

@@ -0,0 +1,14 @@
+ALTER TABLE content ADD ftsid integer;
+CREATE VIRTUAL TABLE fts USING fts5(content, content='');
+DROP TRIGGER contents_ai;
+DROP TRIGGER contents_au;
+DROP TRIGGER contents_ad;
+CREATE TEMP TABLE contentstemp(id INTEGER PRIMARY KEY, content text);
+CREATE TRIGGER contentstemp_ai AFTER INSERT ON contentstemp BEGIN  INSERT INTO fts(content) VALUES (new.content); UPDATE content SET ftsid=last_insert_rowid() WHERE id = new.id; END;
+INSERT INTO contentstemp(id, content) SELECT id, content FROM content;
+DROP TRIGGER contentstemp_ai;
+DROP TABLE contentstemp;
+DROP TABLE content_fts;
+ALTER TABLE content DROP COLUMN content;
+CREATE INDEX content_ftsid ON content (ftsid);
+CREATE TRIGGER content_ad AFTER DELETE ON content BEGIN  INSERT INTO fts(fts, rowid) VALUES('delete', old.ftsid); END;

shared/migrations/3.sql

@@ -0,0 +1 @@
+DROP trigger content_ad;

shared/migrations/migrations.qrc

@@ -1,5 +1,7 @@
 <RCC>
     <qresource prefix="/looqs-migrations">
         <file>1.sql</file>
+        <file>2.sql</file>
+        <file>3.sql</file>
     </qresource>
 </RCC>

shared/savefileresult.h

@@ -30,4 +30,9 @@ static inline QString SaveFileResultToString(SaveFileResult sfr)
 	return SaveFileResultStr[(int)sfr];
 }
 
+static inline bool isErrorSaveFileResult(SaveFileResult result)
+{
+	return result == DBFAIL || result == PROCESSFAIL || result == NOTFOUND || result == NOACCESS;
+}
+
 #endif // SAVEFILERESULT_H

shared/searchresult.h

@@ -6,7 +6,7 @@ class SearchResult
 {
   public:
 	FileData fileData;
-	QVector<unsigned int> pages;
+	unsigned int page;
 	bool wasContentSearch = false;
 };
 

shared/shared.pro

@@ -77,6 +77,7 @@ HEADERS += sqlitesearch.h \
     filescanworker.h \
     indexer.h \
     indexsyncer.h \
+    limitqueue.h \
     logger.h \
     looqsgeneralexception.h \
     looqsquery.h \

shared/sqlitedbservice.cpp

@@ -151,11 +151,14 @@ SaveFileResult SqliteDbService::saveFile(QFileInfo fileInfo, QVector<PageData> &
 	int lastid = inserterQuery.lastInsertId().toInt();
 	for(const PageData &data : pageData)
 	{
+		QSqlQuery ftsQuery(db);
+		ftsQuery.prepare("INSERT INTO fts(content) VALUES(?)");
+		ftsQuery.addBindValue(data.content);
+		ftsQuery.exec();
 		QSqlQuery contentQuery(db);
-		contentQuery.prepare("INSERT INTO content(fileid, page, content) VALUES(?, ?, ?)");
+		contentQuery.prepare("INSERT INTO content(fileid, page, ftsid) VALUES(?, ?, last_insert_rowid())");
 		contentQuery.addBindValue(lastid);
 		contentQuery.addBindValue(data.pagenumber);
-		contentQuery.addBindValue(data.content);
 		if(!contentQuery.exec())
 		{
 			db.rollback();

shared/sqlitesearch.cpp

@@ -66,6 +66,33 @@ QString SqliteSearch::createSortSql(const QVector<SortCondition> sortConditions)
 	return "";
 }
 
+QString SqliteSearch::escapeFtsArgument(QString ftsArg)
+{
+	QString result;
+	QRegularExpression extractor(R"#("([^"]*)"|([^\s]+))#");
+	QRegularExpressionMatchIterator i = extractor.globalMatch(ftsArg);
+	while(i.hasNext())
+	{
+		QRegularExpressionMatch m = i.next();
+		QString value = m.captured(1);
+		if(value.isEmpty())
+		{
+			value = m.captured(2);
+			if(value.endsWith('*'))
+			{
+				value = value.mid(0, value.size() - 1);
+			}
+			result += "\"" + value + "\"*";
+		}
+		else
+		{
+			value = "\"\"" + value + "\"\"";
+			result += "\"" + value + "\" ";
+		}
+	}
+	return result;
+}
+
 QPair<QString, QVector<QString>> createNonArgPair(QString key)
 {
 	return {" " + key + " ", QVector<QString>()};
@@ -115,9 +142,9 @@ QPair<QString, QVector<QString>> SqliteSearch::createSql(const Token &token)
 	}
 	if(token.type == FILTER_CONTENT_CONTAINS)
 	{
-		return {" content.id IN (SELECT content_fts.ROWID FROM content_fts WHERE content_fts.content MATCH ? ORDER BY "
+		return {" content.id IN (SELECT fts.ROWID FROM fts WHERE fts.content MATCH ? ORDER BY "
 				"rank) ",
-				{value}};
+				{escapeFtsArgument(value)}};
 	}
 	throw LooqsGeneralException("Unknown token passed (should not happen)");
 }
@@ -141,11 +168,11 @@ QSqlQuery SqliteSearch::makeSqlQuery(const LooqsQuery &query)
 		{
 			if(!ftsAlreadyJoined)
 			{
-				joinSql += " INNER JOIN content_fts ON content.id = content_fts.ROWID ";
+				joinSql += " INNER JOIN fts ON content.ftsid = fts.ROWID ";
 				ftsAlreadyJoined = true;
 			}
-			whereSql += " content_fts.content MATCH ? ";
-			bindValues.append(token.value);
+			whereSql += " fts.content MATCH ? ";
+			bindValues.append(escapeFtsArgument(token.value));
 		}
 		else
 		{
@@ -167,10 +194,9 @@ QSqlQuery SqliteSearch::makeSqlQuery(const LooqsQuery &query)
 				sortSql = "ORDER BY rank";
 			}
 		}
-		prepSql =
-			"SELECT file.path AS path, group_concat(content.page) AS pages, file.mtime AS mtime, file.size AS size, "
-			"file.filetype AS filetype FROM file INNER JOIN content ON file.id = content.fileid " +
-			joinSql + " WHERE 1=1 AND " + whereSql + " GROUP BY file.path  " + sortSql;
+		prepSql = "SELECT file.path AS path,  content.page AS page, file.mtime AS mtime, file.size AS size, "
+				  "file.filetype AS filetype FROM file INNER JOIN content ON file.id = content.fileid " +
+				  joinSql + " WHERE 1=1 AND " + whereSql + " " + sortSql;
 	}
 	else
 	{
@@ -178,7 +204,7 @@ QSqlQuery SqliteSearch::makeSqlQuery(const LooqsQuery &query)
 		{
 			sortSql = "ORDER BY file.mtime DESC";
 		}
-		prepSql = "SELECT file.path AS path, '0' as pages,  file.mtime AS mtime, file.size AS size, file.filetype AS "
+		prepSql = "SELECT file.path AS path, '0' as page,  file.mtime AS mtime, file.size AS size, file.filetype AS "
 				  "filetype FROM file WHERE  1=1 AND " +
 				  whereSql + " " + sortSql;
 	}
@@ -221,15 +247,7 @@ QVector<SearchResult> SqliteSearch::search(const LooqsQuery &query)
 		result.fileData.mtime = dbQuery.value("mtime").toUInt();
 		result.fileData.size = dbQuery.value("size").toUInt();
 		result.fileData.filetype = dbQuery.value("filetype").toChar();
-		QString pages = dbQuery.value("pages").toString();
-		QStringList pagesList = pages.split(",");
-		for(QString &page : pagesList)
-		{
-			if(page != "")
-			{
-				result.pages.append(page.toUInt());
-			}
-		}
+		result.page = dbQuery.value("page").toUInt();
 		result.wasContentSearch = contentSearch;
 		results.append(result);
 	}

shared/sqlitesearch.h

@@ -18,6 +18,7 @@ class SqliteSearch
 	QString fieldToColumn(QueryField field);
 	QPair<QString, QVector<QString>> createSql(const Token &token);
 	QString createSortSql(const QVector<SortCondition> sortConditions);
+	QString escapeFtsArgument(QString ftsArg);
 };
 
 #endif // SQLITESEARCH_H