add time diff plugin

src/plugins/timediffplugin.py

@@ -0,0 +1,34 @@
+from typing import Optional
+
+from PySide6.QtGui import QIcon
+
+from src.pluginbase import PluginBase
+from src.plugins.domain.raction import RAction
+from src.plugins.logfile.preprocesslineshook import PreProcessLinesHook
+from src.plugins.timediff.time_diff_pre_process_lines_hook import TimeDiffPreProcessLinesHook
+from src.i18n import _
+
+
+class TimeDiffPlugin(PluginBase):
+    def __init__(self):
+        super(TimeDiffPlugin, self).__init__()
+        self.time_diff_state = False
+        self.time_diff_action = RAction(_(""), lambda: self._toggle_time_diff(),
+                                        icon_file="icons/ionicons/stopwatch-outline.svg", checkable=True)
+
+    def copy(self):
+        return TimeDiffPlugin()
+
+    def get_filter_widget_actions(self) -> [RAction]:
+        return [
+            self.time_diff_action
+        ]
+
+    def get_pre_process_lines_hook(self) -> Optional[PreProcessLinesHook]:
+        if self.time_diff_state:
+            return TimeDiffPreProcessLinesHook()
+        return None
+
+    def _toggle_time_diff(self):
+        self.time_diff_state = not self.time_diff_state
+        self.time_diff_action.set_checked(self.time_diff_state)