store history using sqlite, add suggestion with open

src/browserwindow.cpp

@@ -2,6 +2,7 @@
 
 #include "adblock.h"
 #include "commandline.h"
+#include "completionview.h"
 #include "hints.h"
 #include "statusbar.h"
 #include "urlutil.h"
@@ -11,8 +12,10 @@
 #include <QEvent>
 #include <QKeyEvent>
 #include <QMouseEvent>
+#include <QRegularExpression>
 #include <QVBoxLayout>
 #include <QWebEnginePage>
+#include <QWebEngineProfile>
 #include <QWebEngineScript>
 #include <QWebEngineView>
 #include <QWidget>
@@ -21,6 +24,14 @@ namespace {
 
 constexpr int kScrollStep = 60;
 constexpr double kZoomStep = 0.1;
+constexpr int kCompletionLimit = 100;
+
+// ":open <query>" or ":o <query>"; captures the prefix and the query.
+const QRegularExpression &openCommand()
+{
+    static const QRegularExpression re(QStringLiteral("^(:(?:open|o) +)(.*)$"));
+    return re;
+}
 
 } // namespace
 
@@ -31,6 +42,7 @@ BrowserWindow::BrowserWindow(QWebEngineProfile *profile, AdBlocker *adBlocker,
     , m_view(new QWebEngineView(profile, this))
     , m_status(new StatusBar(this))
     , m_commandLine(new CommandLine(this))
+    , m_completion(new CompletionView(this))
 {
     setupUi();
     connectView();
@@ -42,6 +54,8 @@ BrowserWindow::BrowserWindow(QWebEngineProfile *profile, AdBlocker *adBlocker,
     connect(m_commandLine, &CommandLine::cancelled, this, [this] {
         setMode(Mode::Normal);
     });
+    connect(m_commandLine, &QLineEdit::textEdited, this, &BrowserWindow::updateCompletion);
+    connect(m_commandLine, &CommandLine::completionCycled, this, &BrowserWindow::cycleCompletion);
     connect(m_adBlocker, &AdBlocker::message, m_status, &StatusBar::showMessage);
 
     qApp->installEventFilter(this);
@@ -61,6 +75,7 @@ void BrowserWindow::setupUi()
     layout->setContentsMargins(0, 0, 0, 0);
     layout->setSpacing(0);
     layout->addWidget(m_view, 1);
+    layout->addWidget(m_completion);
     layout->addWidget(m_status);
     layout->addWidget(m_commandLine);
     setCentralWidget(central);
@@ -80,11 +95,17 @@ void BrowserWindow::connectView()
     connect(m_view, &QWebEngineView::titleChanged, this, [this](const QString &title) {
         setWindowTitle(title.isEmpty() ? QStringLiteral("att")
                                        : QStringLiteral("%1 - att").arg(title));
+        m_history.updateTitle(m_view->url(), title);
     });
     connect(m_view, &QWebEngineView::loadFinished, this, [this](bool ok) {
         m_status->setProgress(100);
-        if (!ok)
+        if (!ok) {
             m_status->showMessage(QStringLiteral("Failed to load page"), true);
+            return;
+        }
+        // Here rather than on urlChanged, which also fires for every redirect
+        // hop and in-page #anchor jump.
+        m_history.addVisit(m_view->url(), m_view->title());
     });
 }
 
@@ -96,6 +117,9 @@ void BrowserWindow::setMode(Mode mode)
     m_mode = mode;
     m_pendingKeys.clear();
 
+    if (mode != Mode::Command)
+        m_completion->setEntries({});
+
     switch (mode) {
     case Mode::Normal:
         m_status->setMode(QString());
@@ -109,6 +133,7 @@ void BrowserWindow::setMode(Mode mode)
         break;
     case Mode::Command:
         m_status->hide();
+        updateCompletion();
         break;
     case Mode::Hint:
         m_status->setMode(QStringLiteral("hint"));
@@ -363,6 +388,14 @@ void BrowserWindow::runCommand(const QString &command)
         m_view->forward();
     } else if (name == QLatin1String("stop")) {
         m_view->stop();
+    } else if (name == QLatin1String("history-clear")) {
+        if (m_history.clear()) {
+            // Also forget Chromium's own record, which colours visited links.
+            m_view->page()->profile()->clearAllVisitedLinks();
+            m_status->showMessage(QStringLiteral("History cleared"));
+        } else {
+            m_status->showMessage(QStringLiteral("Could not clear history"), true);
+        }
     } else if (name == QLatin1String("adblock-update")) {
         m_adBlocker->update();
     } else if (name == QLatin1String("adblock-toggle")) {
@@ -374,6 +407,30 @@ void BrowserWindow::runCommand(const QString &command)
     }
 }
 
+void BrowserWindow::updateCompletion()
+{
+    const QRegularExpressionMatch match = openCommand().match(m_commandLine->text());
+    if (!match.hasMatch()) {
+        m_completion->setEntries({});
+        return;
+    }
+    const QStringList words = match.captured(2).split(QLatin1Char(' '), Qt::SkipEmptyParts);
+    m_completion->setEntries(m_history.search(words, kCompletionLimit));
+}
+
+void BrowserWindow::cycleCompletion(int step)
+{
+    if (!m_completion->isVisible())
+        return;
+    const QString url = m_completion->cycle(step);
+    if (url.isEmpty())
+        return;
+    // Keep whichever of ":o " / ":open " the user typed.
+    const QRegularExpressionMatch match = openCommand().match(m_commandLine->text());
+    const QString prefix = match.hasMatch() ? match.captured(1) : QStringLiteral(":open ");
+    m_commandLine->setCommandText(prefix + url);
+}
+
 void BrowserWindow::openUrl(const QString &input)
 {
     const QUrl url = urlutil::fromUserInput(input);