# begin common.sh {{{

# Copyright (C) 2013-2014, 2016-2017 Luke Shumaker <lukeshu@sbcglobal.net>
#
# This file is not considered part of GNU Emacs.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

unset IFS
IFS=$' \t\n'

if type gettext &>/dev/null; then
	_() { gettext "$@"; }
else
	_() { echo "$@"; }
fi

print() {
	printf -- "$(_ "$1")\n" "${@:2}"
}

flag() {
	if [[ -z "$_flag_indent" ]]; then
		local str=$(emacsclient --help |
		            sed -rn '/^-.*\s\s/{ s/(\s\s)\S.*/\1/p; q; }' |
		            expand)
		declare -gi _flag_indent=${#str}
	fi
	local flag=$1
	if [[ ${#1} -ge $_flag_indent ]]; then
		printf -- "%s\n" "$flag"
		flag=''
	fi
	local text
	text="$(print "${@:2}")"
	printf -- "%- ${_flag_indent}s%s\n" "$flag" "${text//$'\n'/"$(printf -- "\n%- ${_flag_indent}s%s\n" '')"}"
}

error() {
	printf -- "%s: %s\n" "$0" "$(print "$@")" >&2
}

emacs_quote() {
	declare -a args=("$@")
	args=("${args[@]//\\/\\\\}") # \ -> \\
	args=("${args[@]//\"/\\\"}") # " -> \"
	printf -- '"%s" ' "${args[@]}" # wrap them in quotes, return
}

version() {
	print '%s (Emacs utils) %s, %s' \
	      "${0##*/}" @VERSION@ "$(emacsclient --version)"
}

# Sets the global variables:
# - emacs_getopt_o
# - emacs_getopt_l
# - emacs_getopt_2
emacs_getopt_init() {
	declare -a a_flags
	readarray -t a_flags < <(
		LC_ALL=C emacsclient --help |
		grep ^- |
		sed -e 's/\s\s.*//' -e 's/, /\n/g' |
		sed -e 's/[ =].*/:/' -e 's/^-*//' |
		grep -vEx 'e|eval'
	)

	declare -a a_flags_o a_flags_l a_flags_2
	readarray -t a_flags_o < <(printf '%s\n' "${a_flags[@]}"|grep -v '^.[^:]')
	readarray -t a_flags_l < <(printf '%s\n' "${a_flags[@]}"|grep    '^.[^:]')
	readarray -t a_flags_2 < <(printf '%s\n' "${a_flags[@]}"|sed -rn -e 's/^(.):$/-\1/p' -e 's/^([^-].*):$/--\1/p')

	local IFS
	IFS=''  emacs_getopt_o="${a_flags_o[*]}"
	IFS=',' emacs_getopt_l="${a_flags_l[*]}"
	IFS='|' emacs_getopt_2="^(${a_flags_2[*]})\$"
}

# Sets the global variable:
# - args
emacs_getopt() {
	declare o="$1"
	declare l="$2"
	shift 2
	[[ -z "${emacs_getopt_o}" ]] ||
	[[ -z "${emacs_getopt_l}" ]] ||
		emacs_getopt_init
	getopt -a \
	       -n "$0" \
	       -o "${emacs_getopt_o}${o}" \
	       -l "${emacs_getopt_l}${l:+,$l}" \
	       -- "$@"
}

emacs_usage() {
	emacsclient --help | grep -E '^(\s|-)' | grep -v '^-e, --eval'
}


next() {
	local mode=$1
	shift
	case "$mode" in
		error) print "Try \``%q --help'' for more information" "$0" >&2; return 1;;
		usage) usage; return 0;;
		version) version; return 0;;
		normal) exec -- "$@";;
		*) error 'Internal error.  The programmer writing this tool screwed up.'; exit 1;;
	esac
}

# }}} end common.sh