Add version flag

README.md

@@ -12,7 +12,7 @@ use it at your own risk.
 - Contributions for testing and support on other OS platforms and Calibre versions
 are greatly welcome.
 
-calibre-rest is built with Flask and Gunicorn. See [API.md](#API.md) for
+calibre-rest is built with Flask and Gunicorn. See [API.md](API.md) for
 documentation on all API endpoints.
 
 ## Install
@@ -127,7 +127,20 @@ $ docker compose up -d app
 or directly on your local machine:
 
 ```console
-$ ./app.py
+$ python3 ./app.py -h
+
+usage: app.py [options]
+
+Options:
+  -h, --help         show this help message and exit
+  -d, --dev          Start in dev/debug mode
+  -c, --calibre      Path to calibre binary directory
+  -l, --library      Path to calibre library
+  -u, --username     Calibre library username
+  -p, --password     Calibre library password
+  -b, --bind         Bind address HOST:PORT
+  -g, --log-level    Log level
+  -v, --version      Print version
 ```
 
 calibre-rest can access any local Calibre libraries or remote [Calibre content
@@ -138,8 +151,6 @@ For the latter, authentication must be enabled and configured.
 For more information, refer to the [calibredb
 documentation](https://manual.calibre-ebook.com/generated/en/calibredb.html).
 
-See [API.md](API.md) for reference.
-
 ### Configuration
 
 The server can be configured with the following environment variables.

app.py

@@ -2,7 +2,7 @@
 
 import argparse
 
-from calibre_rest import GunicornApp, create_app
+from calibre_rest import GunicornApp, __version__, create_app
 from config import DevConfig, ProdConfig
 
 if __name__ == "__main__":
@@ -12,7 +12,7 @@
         "--dev",
         required=False,
         action="store_true",
-        help="Run dev server",
+        help="Start in dev/debug mode",
     )
     parser.add_argument(
         "-c",
@@ -43,8 +43,15 @@
     parser.add_argument(
         "-b", "--bind", required=False, type=str, help="Bind address HOST:PORT"
     )
+    parser.add_argument(
+        "-v", "--version", required=False, action="store_true", help="Print version"
+    )
     args = parser.parse_args()
 
+    if args.version:
+        print(__version__)
+        exit(0)
+
     if args.dev:
         app_config = DevConfig(
             calibredb=args.calibre,