CLI: Add a --version option to display the YOGA's version

README.rst

@@ -64,6 +64,7 @@ Changelog
   * JPEG optimization has been improved by using some optimizations from
     MozJPEG after the Guetzli encoding (from 2.4 % to 7.3 % of additional size
     reduction)
+  * CLI: add a ``--version`` option to get YOGA's version
   * **For packagers:**
 
     * new dependency to `mozjpeg-lossless-optimization

doc/cli/index.rst

@@ -12,6 +12,7 @@ Command Line Interface
 
     optional arguments:
       -h, --help     show this help message and exit
+      --version      show program's version number and exit
 
 
 The YOGA command line interface is divided in two sub-commands:

yoga/cli.py

@@ -4,6 +4,7 @@ from functools import partial
 
 from .image.cli import add_image_cli_options
 from .model.cli import add_model_cli_options
+from .version import VERSION
 
 
 def _type_path(mode, string):
@@ -71,6 +72,12 @@ def generate_main_cli():
         prog="yoga",
         usage="%(prog)s [-h] {image,model} [options...] input output",
     )
+    parser.add_argument(
+        "--version",
+        action="version",
+        version="%%(prog)s %s" % VERSION,
+    )
+
     subparsers = parser.add_subparsers(dest="subcommand")
 
     image_parser = subparsers.add_parser(

yoga/version.py

@@ -0,0 +1 @@
+VERSION = "1.0.0"