Add patch-check steps in PRESUBMIT.py

It substitutes patch-check and style-check by:

- man format checks and warnings
- long lines (max 80, except urls)
- trailing whitespaces
- tab indentation (except make)
- EOL

Change-Id: I33f391bac37c15e995182d735afdbd4efb5c7cae
Bug: b:185520507

PRESUBMIT.py

@@ -0,0 +1,111 @@
+# Copyright (c) 2021, Google Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#   * Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+#
+#   * Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in
+#     the documentation and/or other materials provided with the
+#     distribution.
+#
+#   * Neither the name of Google nor the names of its contributors may
+#     be used to endorse or promote products derived from this software
+#     without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+"""Top-level presubmit script for libwebp.
+
+See https://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts for
+details on the presubmit API built into depot_tools.
+"""
+
+import subprocess2
+USE_PYTHON3 = True
+_INCLUDE_MAN_FILES_ONLY = [r"man/.+\.1$"]
+_LIBWEBP_MAX_LINE_LENGTH = 80
+
+
+def _RunManCmd(input_api, output_api, man_file):
+    """man command wrapper."""
+    cmd = ["man", "--warnings", "-EUTF-8", "-l", "-Tutf8", "-Z", man_file]
+    name = "Check %s file." % man_file
+    start = input_api.time.time()
+    output, _ = subprocess2.communicate(cmd,
+                                        stdout=None,
+                                        stderr=subprocess2.PIPE,
+                                        universal_newlines=True)
+    duration = input_api.time.time() - start
+    if output[1]:
+        return output_api.PresubmitError(
+            "%s\n%s (%4.2fs) failed\n%s" %
+            (name, " ".join(cmd), duration, output[1]))
+    return output_api.PresubmitResult("%s\n%s (%4.2fs)\n" %
+                                      (name, " ".join(cmd), duration))
+
+
+def _CheckManFiles(input_api, output_api):
+    """Makes sure that libwebp/ man files are clean."""
+
+    man_sources = lambda x: input_api.FilterSourceFile(
+        x, files_to_check=_INCLUDE_MAN_FILES_ONLY, files_to_skip=None)
+
+    affected_man_files = input_api.change.AffectedFiles(
+        file_filter=man_sources)
+    results = [
+        _RunManCmd(input_api, output_api, man_file.AbsoluteLocalPath())
+        for man_file in affected_man_files
+    ]
+    return results
+
+
+def _CommonChecks(input_api, output_api):
+    """Ensures this patch does not have trailing spaces, extra EOLs,
+       or long lines.
+    """
+
+    results = []
+    results.extend(
+        input_api.canned_checks.CheckChangeHasNoCrAndHasOnlyOneEol(
+            input_api, output_api))
+    results.extend(
+        input_api.canned_checks.CheckChangeHasNoTabs(input_api, output_api))
+    results.extend(
+        input_api.canned_checks.CheckChangeHasNoStrayWhitespace(
+            input_api, output_api))
+    results.extend(
+        input_api.canned_checks.CheckLongLines(
+            input_api, output_api, maxlen=_LIBWEBP_MAX_LINE_LENGTH))
+    results.extend(
+        input_api.canned_checks.CheckPatchFormatted(input_api,
+                                                    output_api,
+                                                    check_clang_format=False,
+                                                    check_python=True))
+    return results
+
+
+def CheckChangeOnUpload(input_api, output_api):
+    results = []
+    results.extend(_CommonChecks(input_api, output_api))
+    results.extend(_CheckManFiles(input_api, output_api))
+    return results
+
+
+def CheckChangeOnCommit(input_api, output_api):
+    results = []
+    results.extend(_CommonChecks(input_api, output_api))
+    results.extend(_CheckManFiles(input_api, output_api))
+    return results