format-cpp

   1 #!/bin/bash
   2 #
   3 # SPDX-License-Identifier: GPL-2.0-only
   4 #
   5 # Copyright (C) 2020-2022 Philippe Proulx <pproulx@efficios.com>
   6
   7 expected_formatter_major_version=14
   8
   9 # Runs the formatter, making sure it's the expected version.
  10 format_cpp() {
  11         local formatter=$1
  12         local version
  13
  14         version=$($formatter --version)
  15
  16         # shellcheck disable=SC2181
  17         if (($? != 0)); then
  18                 echo "Cannot execute \`$formatter --version\`." >&2
  19                 return 1
  20         fi
  21
  22         if [[ "$version" != *"clang-format version $expected_formatter_major_version"* ]]; then
  23                 echo "Expecting clang-format $expected_formatter_major_version." >&2
  24                 echo -n Got: >&2
  25                 echo " \`$version\`" >&2
  26                 echo >&2
  27                 echo "Use the FORMATTER environment variable to specify the location of clang-format $expected_formatter_major_version"
  28                 return 1
  29         fi
  30
  31         local root_dir
  32
  33         root_dir="$(dirname "${BASH_SOURCE[0]}")"
  34
  35         # Using xargs to fail as soon as the formatter fails (`-exec`
  36         # won't stop if its subprocess fails).
  37         #
  38         # shellcheck disable=SC2086
  39         find "$root_dir" -path './src/vendor' -prune \
  40                 -o -type f \( -name '*\.h' -o -name '*\.hpp' -o -name '*\.c' -o -name '*\.cpp' \) \
  41                 -not -path '*/\.*' -print0 | xargs -P$(nproc) -n1 -0 $formatter -i --style=file --fallback-style=none
  42 }
  43
  44 if [[ -n "$FORMATTER" ]]; then
  45         # Try using environment-provided formatter
  46         formatter=$FORMATTER
  47 elif command -v clang-format-$expected_formatter_major_version &> /dev/null; then
  48         # Try using the expected version of clang-format
  49         formatter="clang-format-$expected_formatter_major_version"
  50 else
  51         # Try using `clang-format` as is
  52         formatter='clang-format'
  53 fi
  54
  55 # Try to format files
  56 format_cpp "$formatter"