fix: format command

Author: dshemetov

README.md

@@ -85,7 +85,7 @@ pip install -r requirements.lint.txt
 # Run lint
 inv lint
 # Run formatter (will tell you which files it modified)
-inv lint --format
+inv format
 ```
 
 If you get the error `ERROR:darker.git:fatal: Not a valid commit name <hash>`,

tasks.py

@@ -31,14 +31,22 @@ def _migrate_file(url: str, filename: str):
 
 
 @task
-def lint(c, format=False, revision="origin/dev"):
-    """Lint and format.
+def lint(c, revision="origin/dev"):
+    """Lint.
 
-    Linter/formatter are automatically read from `pyproject.toml`.
+    Linters automatically read from `pyproject.toml`.
     """
-    diff = "--diff --check" if not format else ""
-    c.run(f"darker {diff} --revision {revision} .", warn=True)
+    c.run(f"darker --diff --check --revision {revision} .", warn=True)
     c.run("echo '\n'")
     out = c.run(f"git diff -U0 {revision} | lint-diffs")
     if out.stdout.strip() != "=== pylint: mine=0, always=0":
         print(out.stdout)
+
+
+@task
+def format(c, revision="origin/dev"):  # pylint: disable=redefined-builtin
+    """Format.
+
+    Darker will format files for you and print which ones changed.
+    """
+    c.run(f"darker --verbose --revision {revision} .", warn=True)