feat(search): search for the selected body text

selectedText() reads the selection with no script injection; JavaScript stays
disabled in the profile. The page's standard menu is kept and the entries are
added to it below a separator.

The quoting is tested through a function taking the text, so it needs no live
web engine: a selection is arbitrary prose and can carry quotes, newlines and
query syntax, none of which notmuch reports as an error.

1 files changed, 34 insertions, 0 deletions

diff --git a/tests/test_messageview.cpp b/tests/test_messageview.cpp
index 6403308..f83a377 100644
--- a/tests/test_messageview.cpp
+++ b/tests/test_messageview.cpp
@@ -52,6 +52,7 @@ private slots:
     void headerOffersSubjectDateAndSenderForOneMessage();
     void headerOffersNoSenderForARealThread();
     void headerOffersNothingForAnAbsentField();
+    void bodySelectionBecomesAQuotedSearch();
 
 private:
     QWebEngineView *webViewOf(MessageView *view) const
@@ -663,5 +664,38 @@ void TestMessageView::headerOffersNothingForAnAbsentField()
         QVERIFY(!query.startsWith(QStringLiteral("cc:")));
 }
 
+void TestMessageView::bodySelectionBecomesAQuotedSearch()
+{
+    // The selection reaches the query as ONE quoted term. Asserted on the
+    // constructed string: a query that lost its quoting is not an error to
+    // notmuch, it simply matches nothing, so nothing downstream would report
+    // this being wrong.
+    //
+    // Takes the text as an argument rather than reading the page, so the
+    // quoting is testable without a live web engine and a rendered document.
+    MessageView view;
+
+    QCOMPARE(view.selectionSearchOffer(QStringLiteral("invoice 4471")).query,
+             QStringLiteral("\"invoice 4471\""));
+
+    // A selection spanning paragraphs arrives full of newlines.
+    QCOMPARE(view.selectionSearchOffer(
+                 QStringLiteral("first line\n\nsecond line")).query,
+             QStringLiteral("\"first line second line\""));
+
+    // Query syntax in the selection is data, not syntax: it is quoted, not
+    // interpreted, so a selection reading "a or b" searches for that phrase.
+    QCOMPARE(view.selectionSearchOffer(QStringLiteral("tag:inbox or x")).query,
+             QStringLiteral("\"tag:inbox or x\""));
+
+    // Nothing selected means no entry, rather than an entry searching for "".
+    QVERIFY(view.selectionSearchOffer(QString()).query.isEmpty());
+    QVERIFY(view.selectionSearchOffer(QStringLiteral("  \n ")).query.isEmpty());
+
+    // A usable offer always carries a label for the menu to show.
+    QVERIFY(!view.selectionSearchOffer(QStringLiteral("invoice 4471"))
+                 .label.isEmpty());
+}
+
 QTEST_MAIN(TestMessageView)
 #include "test_messageview.moc"