Adds webp support in the CLI

doc/cli/image.rst

@@ -16,11 +16,12 @@ YOGA Image Command Line Interface
       -h, --help            show this help message and exit
       -v, --verbose         enable verbose mode
       -q, --quiet           enable quiet mode (takes precedence over verbose)
-      --output-format {orig,auto,jpeg,png}
+      --output-format {orig,auto,jpeg,png,webp,webpl}
                             format of the output image
       --resize {orig,<SIZE>,<WIDTH>x<HEIGHT>}
                             resize the image
       --jpeg-quality 0-100  JPEG quality if the output format is set to 'jpeg'
+      --webp-quality 0-100  WEBP quality if the output format is set to 'webp'
       --opacity-threshold 0-255
                             threshold below which a pixel is considered transparent
 
@@ -94,6 +95,25 @@ The default JPEG quality is ``84%``.
    This option has effect only when the output image is a JPEG.
 
 
+Output WEBP Quality
+-------------------
+
+YOGA allows you to tune the desired quality of the WEBP it outputs with the ``--webp-quality`` option. This option takes an integer between ``0`` and ``100`` as parameter:
+
+* ``0``: ugly images but smaller files,
+* ``100``: best quality images but larger files.
+
+The default WEBP quality is ``90%``.
+
+::
+
+    yoga  image  --output-format=webp  --webp-quality=90  input.png  output.webp
+
+.. NOTE::
+
+   This option has effect only when the output image is a lossy WEBP.
+
+
 Opacity Threshold
 -----------------
 

yoga/image/cli.py

@@ -40,8 +40,8 @@ def add_image_cli_options(parser, prefix=""):
     parser.add_argument(
         "--%soutput-format" % prefix,
         help="format of the output image",
-        metavar="{orig,auto,jpeg,png}",
-        choices=["orig", "auto", "jpeg", "jpg", "png"],
+        metavar="{orig,auto,jpeg,png,webp,webpl}",
+        choices=["orig", "auto", "jpeg", "jpg", "png", "webp", "webpl"],
         default=DEFAULT_OPTIONS["output_format"],
     )
     parser.add_argument(
@@ -58,6 +58,13 @@ def add_image_cli_options(parser, prefix=""):
         type=partial(_type_range, 0, 100),
         default=DEFAULT_OPTIONS["jpeg_quality"],
     )
+    parser.add_argument(
+        "--%swebp-quality" % prefix,
+        help="WEBP quality if the output format is set to 'webp'",
+        metavar="0-100",
+        type=partial(_type_range, 0, 100),
+        default=DEFAULT_OPTIONS["webp_quality"],
+    )
     parser.add_argument(
         "--%sopacity-threshold" % prefix,
         help="threshold below which a pixel is considered transparent",