tools: Add code formatting and CI scripts.

Adapted from the micropython repo.

Signed-off-by: Damien George <damien@micropython.org>

tools/ci.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+########################################################################################
+# code formatting
+
+function ci_code_formatting_setup {
+    sudo apt-add-repository --yes --update ppa:pybricks/ppa
+    sudo apt-get install uncrustify
+    pip3 install black
+    uncrustify --version
+    black --version
+}
+
+function ci_code_formatting_run {
+    tools/codeformat.py -v
+}

tools/codeformat.py

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+#!/usr/bin/env python3
+#
+# This file is part of the MicroPython project, http://micropython.org/
+#
+# The MIT License (MIT)
+#
+# Copyright (c) 2020 Damien P. George
+# Copyright (c) 2020 Jim Mussared
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import argparse
+import glob
+import itertools
+import os
+import re
+import subprocess
+
+# Relative to top-level repo dir.
+PATHS = [
+    # C
+    "**/*.[ch]",
+    # Python
+    "**/*.py",
+]
+
+EXCLUSIONS = []
+
+# Path to repo top-level dir.
+TOP = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
+
+UNCRUSTIFY_CFG = os.path.join(TOP, "tools/uncrustify.cfg")
+
+C_EXTS = (
+    ".c",
+    ".h",
+)
+PY_EXTS = (".py",)
+
+
+def list_files(paths, exclusions=None, prefix=""):
+    files = set()
+    for pattern in paths:
+        files.update(glob.glob(os.path.join(prefix, pattern), recursive=True))
+    for pattern in exclusions or []:
+        files.difference_update(glob.fnmatch.filter(files, os.path.join(prefix, pattern)))
+    return sorted(files)
+
+
+def fixup_c(filename):
+    # Read file.
+    with open(filename) as f:
+        lines = f.readlines()
+
+    # Write out file with fixups.
+    with open(filename, "w", newline="") as f:
+        dedent_stack = []
+        while lines:
+            # Get next line.
+            l = lines.pop(0)
+
+            # Dedent #'s to match indent of following line (not previous line).
+            m = re.match(r"( +)#(if |ifdef |ifndef |elif |else|endif)", l)
+            if m:
+                indent = len(m.group(1))
+                directive = m.group(2)
+                if directive in ("if ", "ifdef ", "ifndef "):
+                    l_next = lines[0]
+                    indent_next = len(re.match(r"( *)", l_next).group(1))
+                    if indent - 4 == indent_next and re.match(r" +(} else |case )", l_next):
+                        # This #-line (and all associated ones) needs dedenting by 4 spaces.
+                        l = l[4:]
+                        dedent_stack.append(indent - 4)
+                    else:
+                        # This #-line does not need dedenting.
+                        dedent_stack.append(-1)
+                else:
+                    if dedent_stack[-1] >= 0:
+                        # This associated #-line needs dedenting to match the #if.
+                        indent_diff = indent - dedent_stack[-1]
+                        assert indent_diff >= 0
+                        l = l[indent_diff:]
+                    if directive == "endif":
+                        dedent_stack.pop()
+
+            # Write out line.
+            f.write(l)
+
+        assert not dedent_stack, filename
+
+
+def main():
+    cmd_parser = argparse.ArgumentParser(description="Auto-format C and Python files.")
+    cmd_parser.add_argument("-c", action="store_true", help="Format C code only")
+    cmd_parser.add_argument("-p", action="store_true", help="Format Python code only")
+    cmd_parser.add_argument("-v", action="store_true", help="Enable verbose output")
+    cmd_parser.add_argument("files", nargs="*", help="Run on specific globs")
+    args = cmd_parser.parse_args()
+
+    # Setting only one of -c or -p disables the other. If both or neither are set, then do both.
+    format_c = args.c or not args.p
+    format_py = args.p or not args.c
+
+    # Expand the globs passed on the command line, or use the default globs above.
+    files = []
+    if args.files:
+        files = list_files(args.files)
+    else:
+        files = list_files(PATHS, EXCLUSIONS, TOP)
+
+    # Extract files matching a specific language.
+    def lang_files(exts):
+        for file in files:
+            if os.path.splitext(file)[1].lower() in exts:
+                yield file
+
+    # Run tool on N files at a time (to avoid making the command line too long).
+    def batch(cmd, files, N=200):
+        while True:
+            file_args = list(itertools.islice(files, N))
+            if not file_args:
+                break
+            subprocess.check_call(cmd + file_args)
+
+    # Format C files with uncrustify.
+    if format_c:
+        command = ["uncrustify", "-c", UNCRUSTIFY_CFG, "-lC", "--no-backup"]
+        if not args.v:
+            command.append("-q")
+        batch(command, lang_files(C_EXTS))
+        for file in lang_files(C_EXTS):
+            fixup_c(file)
+
+    # Format Python files with black.
+    if format_py:
+        command = ["black", "--fast", "--line-length=99"]
+        if args.v:
+            command.append("-v")
+        else:
+            command.append("-q")
+        batch(command, lang_files(PY_EXTS))
+
+
+if __name__ == "__main__":
+    main()