hook-wrapper

#! /usr/bin/env sh
set -e

# Wrapper for run scripts in ${g_hooks_source}/<hook-name>.d
# Run it directly to setup

# Opts
g_hooks_source='../git-hooks' # Storage for <hook-name>.d (can be relative to this script)
g_page_size=20 # Maximum hooks per page
TAG='[HOOK-WRAPPER]' # Prefix in logs

# Find real path. Details on http://stackoverflow.com/a/29835459
rreadlink() (
	target="$1" fname= targetDir= CDPATH=
	{ \unalias command; \unset -f command; } >/dev/null 2>&1 || true
	[ -n "${ZSH_VERSION}" ] && options[POSIX_BUILTINS]=on
	while :; do
		[ -L "${target}" ] || [ -e "${target}" ] || { command printf '%s\n' "ERROR: '${target}' does not exist." >&2; return 1; }
		command cd "$(command dirname -- "${target}")"
		fname=$(command basename -- "${target}")
		[ "${fname}" = '/' ] && fname=''
		if [ -L "${fname}" ]; then
			target=$(command ls -l "${fname}")
			target="${target#* -> }"
			continue
		fi
		break
	done
	targetDir=$(command pwd -P)
	if [ "${fname}" = '.' ]; then
		command printf '%s\n' "${targetDir%/}"
	elif  [ "${fname}" = '..' ]; then
		command printf '%s\n' "$(command dirname -- "${targetDir}")"
	else
		command printf '%s\n' "${targetDir%/}/${fname}"
	fi
)

# Stolen from http://www.etalabs.net/sh_tricks.html
# escape args and print in array-like form
asave () {
	for i do printf '%s\n' "${i}" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
	printf '%s\n' ' '
}

# escape find results and print in array-like form
afind () {
	find "$@" -exec sh -c "for i do printf %s\\\\n \"\${i}\" \\
	| sed \"s/'/'\\\\\\\\''/g;1s/^/'/;\\\$s/\\\$/' \\\\\\\\/\"
	done; printf '%s\n' ' '" dummy '{}' +
}

setup() {
	. "$(dirname -- "${self}")/hook-setup"
}

wrapper() {
	printf "\n${TAG}: %s\n" "Begin '${hook}'..."
	hook_d="$(rreadlink "${g_hooks_source}/${hook}.d/")"
	if [ ! -e "${hook_d}" ] || [ ! -d "${hook_d}" ]; then
		printf "${TAG}: %s\n" "Missed '${hook_d}', nothing to do..."
		exit 0
	else
		args=$(asave "${@}")
		eval "set -- $(afind "${hook_d}" -maxdepth 1 -type f | sort -n | sed '/^[[:space:]]*$/d'; printf '%s\n' ' ' )"
		[ "$#" -eq 0 ] && printf "${TAG}: %s\n" "Empty '$(basename -- "${hook_d}")', nothing to do..."
		for file; do
			if [ -s ${file} ] && [ -x ${file} ]; then
				printf "${TAG}: %s\n" "Running '$(basename -- "${file}")'..." #"Args: ${*}"
				(eval "set -- ${args}"; "${file}" "${@}"); err=$?
				[ ${err} -ne 0 ] && printf "${TAG}: %s\n" "...Failed with '${err}'" >&2 && exit ${err}
			else
				printf "${TAG}: %s\n" "Empty/non-exec '$(basename -- "${file}")', ignoring..."
				continue
			fi
		done
	fi
	printf "${TAG}: %s\n" "Completed '$(basename -- "$0")'."
	return 0
}

# Begin
IFS="$(printf '%b' '\n\t')"
self="$(rreadlink "$0")"
hook="$(basename -- "$0")"
[ ! x"{g_hooks_source}" = x ] && [ "${g_hooks_source#/}" = "${g_hooks_source}" ] \
	&& g_hooks_source="$(dirname -- "${self}")/${g_hooks_source}" \
	|| g_hooks_source="$(dirname -- "${self}")/../git-hooks}"

case "${hook}" in
	"$(basename -- "${self}")") setup "${@}";;
	*) wrapper "${@}";;
esac
exit 0