Add a JSON frame profile stats file pretty-printer script.

(cherry picked from commit ab3083819793a30911354670a7929b0d3f7c104c)

scripts/perf/profile_pretty.py

@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+"""\
+@file   profile_pretty.py
+@author Nat Goodspeed
+@date   2024-09-12
+@brief  Pretty-print a JSON file from Develop -> Render Tests -> Frame Profile
+
+$LicenseInfo:firstyear=2024&license=viewerlgpl$
+Copyright (c) 2024, Linden Research, Inc.
+$/LicenseInfo$
+"""
+
+import logsdir
+import json
+from pathlib import Path
+import sys
+
+class Error(Exception):
+    pass
+
+def pretty(path=None):
+    if not path:
+        logs = logsdir.logsdir()
+        profiles = Path(logs).glob('profile.*.json')
+        sort = [(p.stat().st_mtime, p) for p in profiles]
+        sort.sort(reverse=True)
+        try:
+            path = sort[0][1]
+        except IndexError:
+            raise Error(f'No profile.*.json files in {logs}')
+        # print path to sys.stderr in case user is redirecting stdout
+        print(path, file=sys.stderr)
+
+    with open(path) as inf:
+        data = json.load(inf)
+    json.dump(data, sys.stdout, indent=4)
+
+def main(*raw_args):
+    from argparse import ArgumentParser
+    parser = ArgumentParser(description="""
+%(prog)s pretty-prints a JSON file from Develop -> Render Tests -> Frame Profile.
+The file produced by the viewer is a single dense line of JSON.
+""")
+    parser.add_argument('path', nargs='?',
+                        help="""profile filename to pretty-print (default is most recent)""")
+
+    args = parser.parse_args(raw_args)
+    pretty(args.path)
+
+if __name__ == "__main__":
+    try:
+        sys.exit(main(*sys.argv[1:]))
+    except (Error, OSError, json.JSONDecodeError) as err:
+        sys.exit(str(err))