[CI] enable code format check

.github/workflows/format-check.yml

@@ -0,0 +1,43 @@
+name: format-check
+
+on:
+  pull_request:
+    branches:
+      - main
+      - xpu-main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
+permissions: read-all
+
+jobs:
+  format-check:
+    # Don't run on forked repos
+    # if: github.repository_owner == 'intel'
+    name: format-check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout intel_extension_for_pytorch
+        uses: actions/checkout@v2
+
+      - name: Checkout submodules
+        run: |
+          git submodule update --init --recursive
+      
+      - name: flake8-check
+        run: |
+          pwd
+          pip install lintrunner pip install lintrunner-adapters
+          lintrunner init
+          python scripts/tools/setup/flake8.py
+ 
+      - name: clang-check
+        run: |
+          pwd
+          python -m pip install clang-format==12.0.1
+          git diff -U0 --no-color  ${{ github.event.pull_request.base.ref }} | python scripts/tools/setup/clang-format-diff.py -p1
+
+
+

scripts/tools/setup/clang-format-diff.py

@@ -0,0 +1,176 @@
+#!/usr/bin/env python
+#
+# ===- clang-format-diff.py - ClangFormat Diff Reformatter ----*- python -*--===#
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+# ===------------------------------------------------------------------------===#
+
+r"""
+ClangFormat Diff Reformatter
+============================
+
+This script reads input from a unified diff and reformats all the changed
+lines. This is useful to reformat all the lines touched by a specific patch.
+Example usage for git/svn users:
+
+  git diff -U0 --no-color HEAD^ | clang-format-diff.py -p1 -i
+  svn diff --diff-cmd=diff -x-U0 | clang-format-diff.py -i
+
+"""
+from __future__ import absolute_import, division, print_function
+
+import argparse
+import difflib
+import re
+import subprocess
+import sys
+
+if sys.version_info.major >= 3:
+    from io import StringIO
+else:
+    from io import BytesIO as StringIO
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Reformat changed lines in diff. Without -i "
+        "option just output the diff that would be "
+        "introduced."
+    )
+    parser.add_argument(
+        "-i",
+        action="store_true",
+        default=False,
+        help="apply edits to files instead of displaying a diff",
+    )
+    parser.add_argument(
+        "-p",
+        metavar="NUM",
+        default=0,
+        help="strip the smallest prefix containing P slashes",
+    )
+    parser.add_argument(
+        "-regex",
+        metavar="PATTERN",
+        default=None,
+        help="custom pattern selecting file paths to reformat "
+        "(case sensitive, overrides -iregex)",
+    )
+    parser.add_argument(
+        "-iregex",
+        metavar="PATTERN",
+        default=r".*\.(cpp|cc|c\+\+|cxx|c|cl|h|hpp|m|mm|inc|js|ts|proto"
+        r"|protodevel|java)",
+        help="custom pattern selecting file paths to reformat "
+        "(case insensitive, overridden by -regex)",
+    )
+    parser.add_argument(
+        "-sort-includes",
+        action="store_true",
+        default=False,
+        help="let clang-format sort include blocks",
+    )
+    parser.add_argument(
+        "-v",
+        "--verbose",
+        action="store_true",
+        help="be more verbose, ineffective without -i",
+    )
+    parser.add_argument(
+        "-style",
+        help="formatting style to apply (LLVM, Google, Chromium, " "Mozilla, WebKit)",
+    )
+    parser.add_argument(
+        "-binary",
+        default="clang-format",
+        help="location of binary to use for clang-format",
+    )
+    args = parser.parse_args()
+
+    # Extract changed lines for each file.
+    filename = None
+    lines_by_file = {}
+    for line in sys.stdin:
+        match = re.search("^\\+\\+\\+\\ (.*?/){%s}(\\S*)" % args.p, line)
+        if match:
+            filename = match.group(2)
+        if filename is None:
+            continue
+
+        if args.regex is not None:
+            if not re.match("^%s$" % args.regex, filename):
+                continue
+        else:
+            if not re.match("^%s$" % args.iregex, filename, re.IGNORECASE):
+                continue
+
+        match = re.search("^@@.*\\+(\\d+)(,(\\d+))?", line)
+        if match:
+            start_line = int(match.group(1))
+            line_count = 1
+            if match.group(3):
+                line_count = int(match.group(3))
+            if line_count == 0:
+                continue
+            end_line = start_line + line_count - 1
+            lines_by_file.setdefault(filename, []).extend(
+                ["-lines", str(start_line) + ":" + str(end_line)]
+            )
+
+    nerr = 0
+    # Reformat files containing changes in place.
+    for filename, lines in lines_by_file.items():
+        if args.i and args.verbose:
+            print("Formatting {}".format(filename))
+        command = [args.binary, filename]
+        if args.i:
+            command.append("-i")
+        if args.sort_includes:
+            command.append("-sort-includes")
+        command.extend(lines)
+        if args.style:
+            command.extend(["-style", args.style])
+        p = subprocess.Popen(
+            command,
+            stdout=subprocess.PIPE,
+            stderr=None,
+            stdin=subprocess.PIPE,
+            universal_newlines=True,
+        )
+        stdout, stderr = p.communicate()
+        if p.returncode != 0:
+            sys.exit(p.returncode)
+
+        if not args.i:
+            with open(filename) as f:
+                code = f.readlines()
+            formatted_code = StringIO(stdout).readlines()
+            diff = difflib.unified_diff(
+                code,
+                formatted_code,
+                filename,
+                filename,
+                "(before formatting)",
+                "(after formatting)",
+            )
+            diff_string = "".join(diff)
+            if len(diff_string) > 0:
+                sys.stdout.write(diff_string)
+                nerr += 1
+
+    if nerr > 0:
+        sys.stdout.write(
+            "\nFormatter check failed. Please format the code"
+            " changes accoding to the formatting advice above.\n"
+        )
+        sys.exit(1)
+    else:
+        sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()