add pacroller-analyze script

setup.py

@@ -23,7 +23,8 @@ setuptools.setup(
     python_requires='>=3.9',
     entry_points={
         'console_scripts': [
-            'pacroller=pacroller.main:main'
+            'pacroller=pacroller.main:main',
+            'pacroller-analyze=pacroller.analyze:main'
         ]
     },
     install_requires=['pyalpm']

src/pacroller/analyze.py

@@ -0,0 +1,48 @@
+#!/usr/bin/python
+
+from pacroller.config import PACMAN_LOG
+from pacroller.checker import _log_parser, checkReport
+from pacroller.utils import back_readline
+import logging
+
+def main() -> None:
+    import argparse
+    parser = argparse.ArgumentParser(description='Standalone Parsing Tool for pacman.log')
+    parser.add_argument('-l', '--log-file', type=str, default=PACMAN_LOG, help='pacman log location')
+    parser.add_argument('-d', '--debug', action='store_true', help='enable debug mode')
+    parser.add_argument('-v', '--verbose', action='store_true', help='show verbose report')
+    parser.add_argument('-n', '--number', type=int, default=0, help='which upgrade to parse')
+    parser.add_argument('-p', '--no-package', action='store_true', help='do not show package changes')
+    args = parser.parse_args()
+    args.number = args.number if args.number >= 0 else - args.number - 1
+
+    logging.basicConfig(level=logging.DEBUG if args.debug else logging.INFO,
+                        format='%(asctime)s - %(module)s - %(funcName)s - %(levelname)s - %(message)s')
+    logger = logging.getLogger()
+    with open(args.log_file, "rb") as f:
+        current_at = 0
+        log = list()
+        for line in back_readline(f):
+            if not line:
+                continue
+            (_, rsrc, msg) = line.split(' ', maxsplit=2)
+            logger.debug(f"{rsrc=} {msg=}")
+            if rsrc == "[PACMAN]":
+                continue
+            log.insert(0, line)
+            if rsrc == "[ALPM]" and msg == "transaction started":
+                current_at += 1
+                if current_at > args.number:
+                    break
+                else:
+                    log.clear()
+        else:
+            logger.info("number out of bound")
+            log.clear()
+        if log:
+            report = checkReport()
+            _log_parser(log, report)
+            print(report.summary(show_package=not args.no_package, verbose=args.verbose))
+
+if __name__ == '__main__':
+    main()