Fix ament_black for new get_sources API (#13)

* Fix ament_black for new get_sources API

* Fix import order

* Add backward compatibility with older black versions

* style

* Move global variables inside method to fix flake8

* Import only for newer versions

* Last tweak

---------

Co-authored-by: Ignacio Vizzo <ignacio@dexory.com>

ament_black/ament_black/main.py

@@ -17,6 +17,7 @@
 
 import argparse
 import contextlib
+from importlib import metadata
 import os
 import sys
 import tempfile
@@ -32,6 +33,7 @@
 from black.const import DEFAULT_INCLUDES
 from black.report import Report
 import click
+from packaging.version import Version
 from unidiff import PatchSet
 
 
@@ -78,18 +80,37 @@ def main(argv=sys.argv[1:]):
         return 1
 
     # TODO(Nacho): Inject the config file results into the ctx (use read_pyproject_toml)
-    sources = get_sources(
-        ctx=click.Context(black),
-        src=tuple(args.paths),
-        quiet=True,
-        verbose=False,
-        include=re_compile_maybe_verbose(DEFAULT_INCLUDES),
-        exclude=re_compile_maybe_verbose(DEFAULT_EXCLUDES),
-        extend_exclude=None,
-        force_exclude=None,
-        report=Report(),
-        stdin_filename='',
-    )
+    BLACK_VERSION = Version(metadata.version('black'))
+    if BLACK_VERSION < Version('23.9.0'):
+        sources = get_sources(
+            ctx=click.Context(black),
+            src=tuple(args.paths),
+            quiet=True,
+            verbose=False,
+            include=re_compile_maybe_verbose(DEFAULT_INCLUDES),
+            exclude=re_compile_maybe_verbose(DEFAULT_EXCLUDES),
+            extend_exclude=None,
+            force_exclude=None,
+            report=Report(),
+            stdin_filename='',
+        )
+    else:
+        # Hack to support newer versions of black in ROS Jazzy
+        # https://github.com/botsandus/ament_black/issues/12
+        from black import find_project_root
+
+        sources = get_sources(
+            root=find_project_root(tuple(args.paths))[0],
+            src=tuple(args.paths),
+            quiet=True,
+            verbose=False,
+            include=re_compile_maybe_verbose(DEFAULT_INCLUDES),
+            exclude=re_compile_maybe_verbose(DEFAULT_EXCLUDES),
+            extend_exclude=None,
+            force_exclude=None,
+            report=Report(),
+            stdin_filename='',
+        )
     checked_files = [str(path) for path in sources]
 
     if args.xunit_file:
@@ -238,7 +259,6 @@ def get_xunit_content(report, testname, elapsed, checked_files):
 """
         % data
     )
-
     xml += '</testsuite>\n'
     return xml