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#!/bin/bash
set -eu
# SPDX-License-Identifier: GPL-2.0-or-later
#
# Copyright (C) 2020-2021 Patryk Obara <patryk.obara@gmail.com>
SCRIPT=$(basename "$0")
readonly SCRIPT
print_usage () {
echo "usage: $SCRIPT [-V|--verify|-d|--diff|-a|--amend] [<commit>]"
echo
echo "Fixes formatting of C and C++ files, that were touched by "
echo "commits since <commit>. Changes are limited only to files and "
echo "lines that were modified. If a file was moved/renamed and only "
echo "slightly modified (less than 10%), then it's not reformatted."
echo
echo "If no <commit> is passed, then default is HEAD~1 - which means "
echo "that only lines touched by the latest commit will be fixed, "
echo "therefore usage of this script is simply:"
echo
echo " $ ./$SCRIPT"
echo
echo "Files are formatted only if .clang-format file is located in one "
echo "of the parent directories of the source file."
echo
echo "Optional parameter --diff (or --verify) displays diff of what was "
echo "formatted and exits with a failure status if diff is not empty"
echo "(this option is intended for CI usage):"
echo
echo " $ ./$SCRIPT --diff"
echo
echo "Optional parameter --amend will amend the latest commit for you."
echo
echo " $ ./$SCRIPT --amend"
echo
echo "If you want to format a whole file instead then use clang-format "
echo "directly, e.g.:"
echo
echo " $ clang-format path/to/file.cpp"
}
main () {
case ${1:-} in
-h|-help|--help) print_usage ;;
-d|--diff) handle_dependencies ; shift ; format "$@" ; assert_empty_diff ;;
-V|--verify) handle_dependencies ; shift ; format "$@" ; assert_empty_diff ;;
-a|--amend) handle_dependencies ; shift ; format "$@" ; amend ;;
*) handle_dependencies ; format "$@" ; show_tip ;;
esac
}
handle_dependencies () {
assign_gnu_sed
assert_min_version git 1007010 "Use git version 1.7.10 or newer."
assert_min_version clang-format 12000000 "Use clang-format version 12.0.0 or newer."
}
SED=""
assign_gnu_sed () {
# Is sed GNU? (BSD seds don't support --version)
if sed --version &>/dev/null; then
SED="sed"
# No, but do we have gsed?
elif command -v gsed &> /dev/null; then
SED="gsed"
# No, so help the user install it and then quit.
else
echo "'sed' is not GNU and 'gsed' is not available."
if [[ "${OSTYPE:-}" == "darwin"* ]]; then
echo "Install GNU sed with: brew install gnu-sed"
else
echo "Install GNU sed with your $OSTYPE package manager."
fi
exit 1
fi
}
assert_min_version () {
if ! check_min_version "$1" "$2" ; then
echo "$3"
exit 1
fi
}
check_min_version () {
$1 --version
$1 --version \
| "$SED" -e "s|.* \([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*|\1 \2 \3|" \
| test_version "$2"
return "${PIPESTATUS[2]}"
}
test_version () {
read -r major minor patch
local -r version=$((major * 1000000 + minor * 1000 + patch))
test "$1" -le "$version"
}
format () {
local -r since_ref=${1:-HEAD~1}
pushd "$(git rev-parse --show-toplevel)" > /dev/null
echo "Using paths relative to: $(pwd)"
find_cpp_files "$since_ref" | run_clang_format
popd > /dev/null
}
assert_empty_diff () {
if [[ -n "$(git_diff HEAD)" ]] ; then
git_diff HEAD
echo
echo "clang-format formatted some code for you."
echo
echo "Run 'git commit -a --amend' to save the result."
exit 1
fi
}
show_tip () {
if [[ -n "$(git_diff HEAD)" ]] ; then
echo
echo "clang-format formatted some code for you."
echo
echo "Run 'git diff' to see what changed."
echo "Run 'git commit -a --amend' to save the result."
exit 0
fi
}
amend () {
git commit -a --amend
}
git_diff () {
git diff --no-ext-diff "$@"
}
find_cpp_files () {
set +e
list_changed_files "$1" | grep -E "\.(h|hpp|c|cpp|cc)$"
set -e
}
list_changed_files () {
git_diff \
--no-renames \
--diff-filter=AMrcd \
--find-renames=90% \
--find-copies=90% \
--name-only \
"$1"
}
run_clang_format () {
while read -r src_file ; do
local ranges=()
while IFS=$'\n' read -r range ; do
ranges+=("$range")
done < <(git_diff_to_clang_line_range "$src_file")
if (( "${#ranges[@]}" )); then
echo "clang-format -i ${ranges[*]} \"$src_file\""
clang-format -i "${ranges[@]}" "$src_file"
fi
done
}
git_diff_to_clang_line_range () {
local -r file=$1
git_diff --ignore-space-at-eol -U0 HEAD~1 "$file" \
| grep -E "^@@" \
| filter_line_range \
| to_clang_line_range
}
# expects line in diff format: "@@ -<line range> +<line range> @@ <context>"
# where <line range> is either <line_number> or <line_number>,<offset>
#
filter_line_range () {
"$SED" -e 's|@@ .* +\([0-9]\+\),\?\([0-9]\+\)\? @@.*|\1 \2|'
}
to_clang_line_range () {
while read -r from_line offset ; do
local to_line=$(( from_line + offset ))
if [[ $from_line -gt 0 && $from_line -le $to_line ]] ; then
echo "-lines=$from_line:$to_line"
fi
done
}
main "$@"
|
