Add script to compare a Frame Profile JSON stats file vs. baseline.

Extract `latest_file()` logic replicated in profile_pretty.py and
profile_csv.py out to logsdir.py, and use for new profile_cmp.py.

(cherry picked from commit 439cfc97a81f221daaf8ba13aa5daa87e8511047)

1 files changed, 46 insertions, 0 deletions

diff --git a/scripts/perf/logsdir.py b/scripts/perf/logsdir.py
new file mode 100644
index 0000000000..c8b498cf78
--- /dev/null
+++ b/scripts/perf/logsdir.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+"""\
+@file   logsdir.py
+@author Nat Goodspeed
+@date   2024-09-12
+@brief  Locate the Second Life logs directory for the current user on the
+        current platform.
+
+$LicenseInfo:firstyear=2024&license=viewerlgpl$
+Copyright (c) 2024, Linden Research, Inc.
+$/LicenseInfo$
+"""
+
+import os
+from pathlib import Path
+import platform
+
+class Error(Exception):
+    pass
+
+# logic used by SLVersionChecker
+def logsdir():
+    app = 'SecondLife'
+    system = platform.system()
+    if (system == 'Darwin'):
+        base_dir = os.path.join(os.path.expanduser('~'),
+                                'Library','Application Support',app)
+    elif (system == 'Linux'): 
+        base_dir = os.path.join(os.path.expanduser('~'),
+                                '.' + app.lower())
+    elif (system == 'Windows'):
+        appdata = os.getenv('APPDATA')
+        base_dir = os.path.join(appdata, app)
+    else:
+        raise ValueError("Unsupported platform '%s'" % system)
+
+    return os.path.join(base_dir, 'logs')
+
+def latest_file(dirpath, pattern):
+    files = Path(dirpath).glob(pattern)
+    sort = [(p.stat().st_mtime, p) for p in files if p.is_file()]
+    sort.sort(reverse=True)
+    try:
+        return sort[0][1]
+    except IndexError:
+        raise Error(f'No {pattern} files in {dirpath}')