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#!/usr/bin/env bash
# Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "cmake-common" project.
# For details, see https://github.com/egor-tensin/cmake-common.
# Distributed under the MIT License.
set -o errexit -o nounset -o pipefail
# Utility
script_name="$( basename -- "${BASH_SOURCE[0]}" )"
readonly script_name
dump() {
local prefix="${FUNCNAME[0]}"
[ "${#FUNCNAME[@]}" -gt 1 ] && prefix="${FUNCNAME[1]}"
local msg
for msg; do
echo "$script_name: $prefix: $msg"
done
}
# Settings
clang_format='clang-format'
clang_format_style='file'
clang_format_diff=
update_clang_format() {
if [ "$#" -ne 1 ]; then
echo "usage: ${FUNCNAME[0]} CLANG_FORMAT_PATH" >&2
return 1
fi
local new_clang_format="$1"
if ! command -v "$new_clang_format" > /dev/null 2>&1; then
dump "couldn't find clang-format at: $new_clang_format" >&2
return 1
fi
clang_format="$new_clang_format"
}
# Command line parsing
script_usage() {
local msg
for msg; do
echo "$script_name: $msg"
done
echo "usage: $script_name [-h|--help] [-b|--clang-format PATH] [-s|--style STYLE] [--diff]
-h,--help show this message and exit
-b,--clang-format set path to clang-format executable
-s,--style clang-format -style parameter argument
--diff don't edit the files, just show the diff"
}
parse_script_options() {
while [ "$#" -gt 0 ]; do
local key="$1"
shift
case "$key" in
-h|--help)
script_usage
exit 0
;;
--diff)
clang_format_diff=1
continue
;;
-b|--clang-format|-s|--style)
;;
*)
script_usage "unrecognized parameter: $key" >&2
exit 1
;;
esac
if [ "$#" -eq 0 ]; then
script_usage "missing argument for parameter: $key" >&2
exit 1
fi
local value="$1"
shift
case "$key" in
-b|--clang-format)
update_clang_format "$value"
;;
-s|--style)
clang_format_style="$value"
;;
*)
script_usage "unrecognized parameter: $key" >&2
exit 1
;;
esac
done
}
# Routines for running clang-format
run_clang_format_diff() {
local exit_code=0
local file
for file; do
if "$clang_format" "-style=$clang_format_style" -- "$file" | diff --unified --label="$file (original)" --label="$file (clang-format)" -- "$file" -; then
continue
else
exit_code="$?"
[ "$exit_code" -eq 1 ] && continue
break
fi
done
return "$exit_code"
}
run_clang_format_edit() {
"$clang_format" -i "-style=$clang_format_style" -- "$@"
}
run_clang_format() {
if [ -z "$clang_format_diff" ]; then
run_clang_format_edit "$@"
else
run_clang_format_diff "$@"
fi
}
# File traversal
list_all_files() {
git ls-tree -r -z --name-only HEAD
}
declare -a cpp_extensions=(c h cc hh cpp hpp cxx hxx cp c++)
list_cpp_files() {
local -A cpp_extension_set
local ext
for ext in ${cpp_extensions[@]+"${cpp_extensions[@]}"}; do
cpp_extension_set[$ext]=1
done
local -a files=()
local file
while IFS= read -d '' -r file; do
basename="$( basename -- "$file" )"
ext="${basename##*.}"
[ "$ext" = "$basename" ] && continue # No .EXTension
[ -n "${cpp_extension_set[$ext]+x}" ] && files+=("$file")
done < <( list_all_files )
printf -- '%s\0' ${files[@]+"${files[@]}"}
}
# Main routines
process_cpp_files() {
local -a files=()
local file
while IFS= read -d '' -r file; do
files+=("$file")
done < <( list_cpp_files )
run_clang_format ${files[@]+"${files[@]}"}
}
main() {
parse_script_options "$@"
process_cpp_files
}
main "$@"
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