qmk fileformat: only print complaints, and fix some of them (#11278)

lib/python/qmk/cli/fileformat.py

@@ -0,0 +1,13 @@
+"""Format files according to QMK's style.
+"""
+from milc import cli
+
+import subprocess
+
+
+@cli.subcommand("Format files according to QMK's style.", hidden=True)
+def fileformat(cli):
+    """Run several general formatting commands.
+    """
+    dos2unix = subprocess.run(['bash', '-c', 'git ls-files -z | xargs -0 dos2unix'], stdout=subprocess.DEVNULL)
+    return dos2unix.returncode