DevTools: Introduce SQL Studio

SQL Studio is a graphical SQL manager program that allows the user
to create and edit SQL scripts.

Userland/DevTools/SQLStudio/ScriptEditor.cpp

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+/*
+ * Copyright (c) 2022, Dylan Katz <dykatz@uw.edu>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCore/Stream.h>
+#include <LibGUI/Dialog.h>
+#include <LibGUI/FilePicker.h>
+#include <LibGUI/MessageBox.h>
+#include <LibGUI/TabWidget.h>
+#include <LibSQL/AST/SyntaxHighlighter.h>
+
+#include "ScriptEditor.h"
+
+namespace SQLStudio {
+
+ScriptEditor::ScriptEditor()
+{
+    set_syntax_highlighter(make<SQL::AST::SyntaxHighlighter>());
+    set_ruler_visible(true);
+}
+
+void ScriptEditor::new_script_with_temp_name(String name)
+{
+    set_name(name);
+}
+
+ErrorOr<void> ScriptEditor::open_script_from_file(LexicalPath const& file_path)
+{
+    auto file = TRY(Core::Stream::File::open(file_path.string(), Core::Stream::OpenMode::Read));
+    auto file_size = TRY(file->size());
+    auto buffer = TRY(ByteBuffer::create_uninitialized(file_size));
+
+    if (!file->read_or_error(buffer))
+        return Error::from_string_literal("Failed to read from file");
+
+    set_text({ buffer.bytes() });
+    m_path = file_path.string();
+    set_name(file_path.title());
+    return {};
+}
+
+ErrorOr<bool> ScriptEditor::save()
+{
+    if (m_path.is_empty())
+        return save_as();
+
+    auto file = TRY(Core::Stream::File::open(m_path, Core::Stream::OpenMode::Write));
+    if (!file->write_or_error(text().bytes()))
+        return Error::from_string_literal("Failed to write to file");
+
+    document().set_unmodified();
+    return true;
+}
+
+ErrorOr<bool> ScriptEditor::save_as()
+{
+    auto maybe_save_path = GUI::FilePicker::get_save_filepath(window(), name(), "sql");
+    if (!maybe_save_path.has_value())
+        return false;
+    auto save_path = maybe_save_path.release_value();
+
+    auto file = TRY(Core::Stream::File::open(save_path, Core::Stream::OpenMode::Write));
+    if (!file->write_or_error(text().bytes()))
+        return Error::from_string_literal("Failed to write to file");
+
+    m_path = save_path;
+
+    auto lexical_path = LexicalPath(save_path);
+    set_name(lexical_path.title());
+
+    auto parent = static_cast<GUI::TabWidget*>(parent_widget());
+    if (parent)
+        parent->set_tab_title(*this, lexical_path.title());
+
+    document().set_unmodified();
+    return true;
+}
+
+ErrorOr<bool> ScriptEditor::attempt_to_close()
+{
+    if (!document().is_modified())
+        return true;
+
+    auto result = GUI::MessageBox::ask_about_unsaved_changes(window(), m_path.is_empty() ? name() : m_path, document().undo_stack().last_unmodified_timestamp());
+    switch (result) {
+    case GUI::Dialog::ExecResult::ExecYes:
+        return save();
+    case GUI::Dialog::ExecResult::ExecNo:
+        return true;
+    default:
+        return false;
+    }
+}
+
+}