Add tool to blend logs, taking timestamps into consideration

tools/merge_logs.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+#
+# Blend log files, keeping events in order.
+#
+
+import sys
+import re
+from datetime import datetime
+
+
+if len(sys.argv) < 2:
+    print("Usage: log_parse.py filename0.log filename1.log ...")
+    sys.exit(1)
+
+
+# 7-bit C1 ANSI sequences
+# https://stackoverflow.com/a/14693789
+ansi_escape = re.compile(r'''
+    \x1B  # ESC
+    (?:   # 7-bit C1 Fe (except CSI)
+        [@-Z\\-_]
+    |     # or [ for CSI, followed by a control sequence
+        \[
+        [0-?]*  # Parameter bytes
+        [ -/]*  # Intermediate bytes
+        [@-~]   # Final byte
+    )
+''', re.VERBOSE)
+
+RE = '\[(?P<time>[0-9]{2}:[0-9]{2}:[0-9]{2}) (?P<name>.*?)\] (?P<message>.*)'
+
+def parse(f):
+    for line in f:
+        line = ansi_escape.sub('', line)
+        m = re.match(RE, line)
+        if m:
+            fields = m.groupdict()
+            fields['time'] = datetime.strptime(fields['time'], '%H:%M:%S')
+            yield fields
+
+
+all_events = []
+for fn in sys.argv[1:]:
+    with open(fn, 'r') as f:
+        all_events.extend(list(parse(f)))
+
+all_events = sorted(all_events, key=lambda fields: fields['time'])
+for event in all_events:
+    print(f"[{event['time'].strftime('%H:%M:%S')} {event['name']}] {event['message']}")