Nacho/fix xunit report (#8)

* Reformat a bit the help, no real changes

* Use black python API to fetch the list of checked files

ament_black/ament_black/main.py

@@ -23,15 +23,19 @@
 import time
 from xml.sax.saxutils import escape, quoteattr
 
+import click
+from black import get_sources
+from black import main as black
+from black import re_compile_maybe_verbose
+from black.concurrency import maybe_install_uvloop
+from black.const import DEFAULT_EXCLUDES, DEFAULT_INCLUDES
+from black.report import Report
 from unidiff import PatchSet
 
 
 def patched_black(*args, **kwargs) -> None:
     from multiprocessing import freeze_support
 
-    from black import main as black
-    from black.concurrency import maybe_install_uvloop
-
     maybe_install_uvloop()
     freeze_support()
     black(*args, **kwargs)
@@ -46,7 +50,7 @@ def main(argv=sys.argv[1:]):
         "paths",
         nargs="*",
         default=[os.curdir],
-        help="The files or directories to check. this argument is directly passed to  black",
+        help="The files or directories to check. this argument is directly passed to black",
     )
     parser.add_argument(
         "--config",
@@ -56,21 +60,38 @@ def main(argv=sys.argv[1:]):
         help="The config file",
     )
     parser.add_argument(
-        "--reformat", action="store_true", help="Reformat the files in place"
+        "--reformat",
+        action="store_true",
+        help="Reformat the files in place",
+    )
+    parser.add_argument(
+        "--xunit-file",
+        help="Generate a xunit compliant XML file",
     )
-    # not using a file handle directly
-    # in order to prevent leaving an empty file when something fails early
-    parser.add_argument("--xunit-file", help="Generate a xunit compliant XML file")
     args = parser.parse_args(argv)
 
     # if we have specified a config file, make sure it exists and abort if not
     if args.config_file is not None and not os.path.exists(args.config_file):
         print("Could not find config file '%s'" % args.config_file, file=sys.stderr)
         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="",
+    )
+    checked_files = [str(path) for path in sources]
+
     if args.xunit_file:
         start_time = time.time()
-    report = []
 
     # invoke black
     black_args_withouth_path = []
@@ -124,7 +145,9 @@ def main(argv=sys.argv[1:]):
             file_name = file_name.split(suffix)[0]
         testname = "%s.%s" % (folder_name, file_name)
 
-        xml = get_xunit_content(report, testname, time.time() - start_time)
+        xml = get_xunit_content(
+            report, testname, time.time() - start_time, checked_files
+        )
         path = os.path.dirname(os.path.abspath(args.xunit_file))
         if not os.path.exists(path):
             os.makedirs(path)
@@ -154,7 +177,7 @@ def get_line_number(data, offset):
     return data[0:offset].count("\n") + data[0:offset].count("\r") + 1
 
 
-def get_xunit_content(report, testname, elapsed):
+def get_xunit_content(report, testname, elapsed, checked_files):
     test_count = sum(max(len(r), 1) for r in report.values())
     error_count = sum(len(r) for r in report.values())
     data = {
@@ -212,10 +235,10 @@ def get_xunit_content(report, testname, elapsed):
 
     # output list of checked files
     data = {
-        "escaped_files": escape("".join(["\n* %s" % r for r in sorted(report.keys())]))
+        "checked_files": escape("".join(["\n* %s" % r for r in sorted(checked_files)]))
     }
     xml += (
-        """  <system-out>Checked files:%(escaped_files)s</system-out>
+        """  <system-out>Checked files:%(checked_files)s</system-out>
 """
         % data
     )