[PATCH 4/5] Add "utils"

["Yordan Karadzhov (VMware)" <y.karadz@gmail.com>]

Place the rest of the code, that is pure Python in tracecrunche/utils.py

Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
---
 tracecruncher/utils.py | 54 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 tracecruncher/utils.py

diff --git a/tracecruncher/utils.py b/tracecruncher/utils.py
new file mode 100644
index 0000000..f785c01
--- /dev/null
+++ b/tracecruncher/utils.py
@@ -0,0 +1,54 @@
+"""
+SPDX-License-Identifier: LGPL-2.1
+
+Copyright 2019 VMware Inc, Yordan Karadzhov (VMware) <y.karadz@gmail.com>
+"""
+
+import json
+
+from . import datawrapper as dw
+from . import ksharkpy as ks
+
+def size(data):
+    """ Get the number of trace records.
+    """
+    for key in dw.data_column_types:
+        if data[key] is not None:
+            return data[key].size
+
+    raise Exception('Data size is unknown.')
+
+def save_session(session, s):
+    """ Save a KernelShark session description of a JSON file.
+    """
+    s.seek(0)
+    json.dump(session, s, indent=4)
+    s.truncate()
+
+
+def new_gui_session(fname, sname):
+    """ Generate and save a default KernelShark session description
+        file (JSON).
+    """
+    ks.new_session_file(fname, sname)
+
+    with open(sname, 'r+') as s:
+        session = json.load(s)
+
+        session['Filters']['filter mask'] = 7
+        session['CPUPlots'] = []
+        session['TaskPlots'] = []
+        session['Splitter'] = [1, 1]
+        session['MainWindow'] = [1200, 800]
+        session['ViewTop'] = 0
+        session['ColorScheme'] = 0.75
+        session['Model']['bins'] = 1000
+
+        session['Markers']['markA'] = {}
+        session['Markers']['markA']['isSet'] = False
+        session['Markers']['markB'] = {}
+        session['Markers']['markB']['isSet'] = False
+        session['Markers']['Active'] = 'A'
+
+        save_session(session, s)
+
-- 
2.20.1