1 files changed, 124 insertions, 0 deletions
diff --git a/src/merge.py b/src/merge.py
new file mode 100644
index 0000000..a004da5
--- /dev/null
+++ b/src/merge.py
@@ -0,0 +1,124 @@
+#!/usr/bin/env python
+
+import argparse
+import json
+import sys
+
+from urllib.parse import parse_qs, urlencode, urlparse, urlunparse
+
+
+def validate_schema(schema):
+    if "format" not in schema:
+        raise ValueError("No format")
+    if schema["format"] != "clicks":
+        raise ValueError(f"Unsupported format: {schema['format']}")
+    if "version" not in schema:
+        raise ValueError("No version")
+    if schema["version"] != "1.0":
+        raise ValueError(f"Unsupported version: {schema['version']}")
+
+
+def cleanup_url(url):
+    parts = urlparse(url)
+    query = parse_qs(parts.query, keep_blank_values=True)
+    if "activeTab" in query:
+        new_query = urlencode({"activeTab": query["activeTab"]})
+    else:
+        new_query = ""
+    parts = parts._replace(query=new_query)
+    return urlunparse(parts)
+
+
+def bad_event(event):
+    # There is a confusing causing "header" event to be reported as click events
+    # "header" events can be reconized by containing brands in tag or x > 1
+    return "Chromium" in event["tag"] or event["x"] > 1.0
+
+
+def merge(input_files, output_fh):
+    merged = {
+        "format": "clicks",
+        "version": "1.0",
+    }
+
+    schemas = []
+    for input_file in input_files:
+        with open(input_file, "r", encoding="utf-8") as in_fh:
+            try:
+                schema = json.load(in_fh)
+                validate_schema(schema)
+                schemas.append(schema)
+            except json.JSONDecodeError:
+                print(f"{input_file}: Invalid JSON, ignored", file=sys.stderr)
+                continue
+            except ValueError:
+                print(f"{input_file}: Invalid JSON, ignored", file=sys.stderr)
+                continue
+
+    max_width = 0.0
+    max_height = 0.0
+    for schema in schemas:
+        if schema["width"] > max_width:
+            max_width = schema["width"]
+        if schema["height"] > max_height:
+            max_height = schema["height"]
+
+    merged["width"] = max_width
+    merged["height"] = max_height
+    url_events = {}
+
+    for schema in schemas:
+        events = None
+        for event in schema["events"]:
+            if "url" in event:
+                url = cleanup_url(event["url"])
+                events = url_events.get(url, None)
+                if events is None:
+                    events = []
+                    url_events[url] = {
+                        "url": event["url"],
+                        "events": events,
+                    }
+                else:
+                    events = events["events"]
+            elif not bad_event(event):
+                # x and y in event is already in percentage of width so should scale
+                events.append(event)
+
+    merged["events"] = []
+    for url, events in url_events.items():
+        merged["events"].append(
+            {
+                "url": events["url"],
+            }
+        )
+        merged["events"].extend(events["events"])
+
+    json.dump(merged, output_fh)
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        prog="merge",
+        description="Merges multiple session reports into one",
+    )
+    parser.add_argument(
+        "-o",
+        "--output",
+        nargs="?",
+        help="output to FILE instead of stdout",
+        metavar="FILE",
+    )
+    parser.add_argument("filename", nargs="+", help="input files")
+
+    args = parser.parse_args()
+
+    if args.output is not None:
+        with open(args.output, "w", encoding="utf-8") as out:
+            merge(args.filename, out)
+    else:
+        merge(args.filename, sys.stdout)
+
+
+if __name__ == "__main__":
+    main()