CLI: Add qmk clean (#10785)

lib/python/qmk/cli/__init__.py

@@ -8,6 +8,7 @@ from milc import cli
 
 from . import c2json
 from . import cformat
+from . import clean
 from . import compile
 from . import config
 from . import docs

lib/python/qmk/cli/clean.py

@@ -0,0 +1,16 @@
+"""Clean the QMK firmware folder of build artifacts.
+"""
+from qmk.commands import run
+from milc import cli
+
+import shutil
+
+
+@cli.argument('-a', '--all', arg_only=True, action='store_true', help='Remove *.hex and *.bin files in the QMK root as well.')
+@cli.subcommand('Clean the QMK firmware folder of build artifacts.')
+def clean(cli):
+    """Runs `make clean` (or `make distclean` if --all is passed)
+    """
+    make_cmd = 'gmake' if shutil.which('gmake') else 'make'
+
+    run([make_cmd, 'distclean' if cli.args.all else 'clean'])