#!/bin/sh
set -e

if [ -z "$ETCKEEPER_CONF_DIR" ]; then
	ETCKEEPER_CONF_DIR=/etc/etckeeper
fi

conf="$ETCKEEPER_CONF_DIR/etckeeper.conf"

usage() {
	echo "usage: etckeeper command [-d directory]" >&2
	exit 1
}

if [ -e $conf ]; then
	. $conf
fi

if [ -n "$GIT_WORK_TREE" ]; then
	unset GIT_WORK_TREE
fi
if [ -n "$GIT_DIR" ]; then
	unset GIT_DIR
fi

program_directory="${0%/*}"
if [ -n "$program_directory" ]; then
	PATH="$PATH:$program_directory"
	export PATH
fi

if [ ! -z "$GIT_COMMIT_OPTIONS" ]; then
	export GIT_COMMIT_OPTIONS
fi
if [ ! -z "$HG_COMMIT_OPTIONS" ]; then
	export HG_COMMIT_OPTIONS
fi
if [ ! -z "$BZR_COMMIT_OPTIONS" ]; then
	export BZR_COMMIT_OPTIONS
fi
if [ ! -z "$DARCS_COMMIT_OPTIONS" ]; then
	export DARCS_COMMIT_OPTIONS
fi

if [ ! -z "$HIGHLEVEL_PACKAGE_MANAGER" ]; then
	export HIGHLEVEL_PACKAGE_MANAGER
fi
if [ ! -z "$LOWLEVEL_PACKAGE_MANAGER" ]; then
	export LOWLEVEL_PACKAGE_MANAGER
fi
if [ ! -z "$AVOID_COMMIT_BEFORE_INSTALL" ]; then
	export AVOID_COMMIT_BEFORE_INSTALL
fi
if [ ! -z "$AVOID_SPECIAL_FILE_WARNING" ]; then
	export AVOID_SPECIAL_FILE_WARNING
fi

if [ ! -z "$PUSH_REMOTE" ]; then
	export PUSH_REMOTE
fi

if [ -z "$HOME" ]; then
	HOME=~root
	export HOME
fi

if [ -z "$1" ]; then
	usage
elif [ "x$1" = "x-h" ] || [ "x$1" = "x--help" ]; then
	man etckeeper || echo "Usage: etckeeper command [-d directory]" >&2
	exit 0
elif [ "x$1" = "x-v" ] || [ "x$1" = "x--version" ]; then
	# This is automatically updated by the Makefile.
	echo "Version: 1.18.20"
	exit 0
fi
command="$1"
shift 1

# compatability code
if [ "$command" = "post-apt" ]; then
	command=post-install
elif [ "$command" = "pre-apt" ]; then
	command=pre-install
fi

if echo "$command" | LANG=C grep -E -q '[^-a-z_]'; then
	echo "etckeeper: invalid command $command" >&2
	exit 1
fi

if [ ! -d "$ETCKEEPER_CONF_DIR/$command.d" ]; then
	echo "etckeeper: $ETCKEEPER_CONF_DIR/$command.d does not exist" >&2
	exit 1
fi

if [ "x$1" = "x-d" ]; then
	if [ -n "$2" ]; then
		ETCKEEPER_DIR="$2"
		shift 2
	else
		usage
	fi
fi

if [ -z "$ETCKEEPER_DIR" ]; then
	ETCKEEPER_DIR=/etc
fi
cd "$ETCKEEPER_DIR"
export ETCKEEPER_DIR

if [ -d ".git" ]; then
	VCS=git
elif [ -d ".hg" ]; then
	VCS=hg
elif [ -d "_darcs" ]; then
	VCS=darcs
elif [ -d ".bzr" ]; then
	VCS=bzr
fi

if [ -z "$VCS" ]; then
	echo "Please configure a VCS in $conf" >&2
	exit 1
fi
export VCS

if command -v perl >/dev/null; then
	lsscripts() {
		LANG=C perl -e '
			$dir=shift;
			print join "\n", grep { ! -d $_ && -x $_ }
				grep /^\Q$dir\/\E[-a-zA-Z0-9]+$/,
				glob "$dir/*";
		' "$1"
	}

	for script in $(lsscripts "$ETCKEEPER_CONF_DIR/$command.d"); do
		"$script" "$@"
	done
else
	# fallback if perl isn't present
	for script in $ETCKEEPER_CONF_DIR/$command.d/*; do
		if [ ! -d "$script" -a -x "$script" ]; then
			echo "$script" | grep -E -q "/[-a-zA-Z0-9]+$"
			[ $? -eq 0 ] && "$script" "$@"
		fi
	done
fi