rename ravenlog to krowlog

There is a database named RavenDB.
KrowLog starts with a K, which is a) distinctive and b) has an association to KDE.

src/ui/tabs.py

@@ -0,0 +1,71 @@
+from typing import Optional
+
+from PySide6.QtWidgets import QWidget, QTabWidget, QVBoxLayout
+
+from src.pluginregistry import PluginRegistry
+from src.plugins.krowlog.Tab import Tab
+from src.settings.settings import Settings
+
+
+class Tabs(QWidget):
+    def __init__(self, settings: Settings):
+        super(Tabs, self).__init__()
+
+        self.settings = settings
+
+        self.tabs = QTabWidget()
+        self.tabs.setTabsClosable(True)
+        self.tabs.setMovable(True)
+        self.tabs.tabCloseRequested.connect(self._close_tab)
+        self.tabs.currentChanged.connect(self._current_tab_changed)
+
+        self.layout = QVBoxLayout(self)
+        self.layout.setContentsMargins(0, 0, 0, 0)
+
+        self.layout.addWidget(self.tabs)
+
+    def add_tab(self, tab: Tab):
+        # if tab already exists then open it
+        for tab_index in range(0, self.tabs.count()):
+            widget: Tab = self.tabs.widget(tab_index)
+            if widget.unique_id == tab.unique_id:
+                self.tabs.setCurrentIndex(tab_index)
+                return
+
+        tab_index = self.tabs.addTab(tab, tab.title)
+        self.tabs.setCurrentIndex(tab_index)
+
+    def _current_tab_changed(self, tab_index: int):
+        tab: Tab = self.tabs.widget(tab_index)
+        if tab:
+            PluginRegistry.execute("update_window_title", tab.title)
+            PluginRegistry.execute("update_status_bar", tab.get_status_text())
+        else:
+            PluginRegistry.execute("update_window_title", "")
+            PluginRegistry.execute("update_status_bar", "")
+
+    def _close_tab(self, tab_index: int):
+        full_tab: Tab = self.tabs.widget(tab_index)
+        full_tab.destruct()
+        self.tabs.removeTab(tab_index)
+
+    def destruct(self):
+        while self.tabs.count() > 0:
+            self._close_tab(0)
+
+    def _current_tab(self) -> int:
+        return self.tabs.currentIndex()
+
+    def current_file(self) -> Optional[str]:
+        if self.tabs.currentIndex() < 0:
+            return None
+
+        tab: Tab = self.tabs.widget(self.tabs.currentIndex())
+        return tab.get_file()
+
+    def open_files(self) -> [str]:
+        result = []
+        for i in range(self.tabs.count()):
+            tab: Tab = self.tabs.widget(i)
+            result.append(tab.get_file())
+        return result