#!/bin/bash
# Copyright (C) 2006 Andre Noll
# Licensed under the LGPL, version 3. See COPYING and COPYING.LESSER.

_gsu_init_errors()
{
	gsu_errors="
GSU_SUCCESS			success
E_GSU_BAD_COMMAND		invalid command
E_GSU_NOT_A_NUMBER		not a number
E_GSU_BAD_CONFIG_VAR		invalid config variable
E_GSU_NEED_VALUE		value required but not given
E_GSU_BAD_BOOL			bad value for boolian option
E_GSU_BAD_OPTION_TYPE		invalid option type
E_GSU_BAD_ARG_COUNT		invalid number of arguments
E_GSU_EDITOR			failed to execute editor
E_GSU_MKDIR			failed to create directory
E_GSU_GETOPTS			getopts error
E_GSU_DIALOG			dialog error
E_GSU_MKTEMP			mktemp error
E_GSU_MENU_TREE			invalid menu tree
${gsu_errors:-}
"
	local a b i=0
	while read a b; do
		if test -z "$a"; then
			continue
		fi
		#echo "a:$a,  b: $b"
		gsu_error_txt[i]="$b"
		eval $a=$i
		i=$(($i + 1))
	done << EOF
	$gsu_errors
EOF
}

# check if $1 is a number
gsu_is_a_number()
{
	result="$1"
	if [ "$1" -eq "$1" ] &> /dev/null; then
		ret=$GSU_SUCCESS
	else
		ret=-$E_GSU_NOT_A_NUMBER
	fi
}

gsu_short_msg()
{
	echo "$1" 1>&2
}

gsu_msg()
{
	gsu_short_msg "$gsu_name: $1"
}

gsu_date_msg()
{
	gsu_short_msg "$gsu_name $(date): $1"
}

gsu_err_msg()
{
	local txt="$result" err

	gsu_is_a_number "$ret"
	if (($ret < 0)); then
		gsu_msg "unknown error ($ret:$txt)"
		exit 1
	fi
	if (($result >= 0)); then
		gsu_msg "unknown error ($result:$txt)"
		exit 1
	fi
	err=$((0 - $result))
	if test -n "$txt"; then
		txt="$txt: ${gsu_error_txt[$err]}"
	else
		txt="${gsu_error_txt[$err]}"
	fi
	gsu_msg "$txt"
}

_gsu_setup()
{
	gsu_name="${gsu_name:-${0##*/}}"
	gsu_config_var_prefix="${gsu_config_var_prefix:=$gsu_name}"
	gsu_banner_txt="${gsu_banner_txt:-set \$gsu_banner_txt to customize this message}"
	_gsu_init_errors
}

# We'd love to use mktemp -t here, but on Linux -t is deprecated in favor of
# --tempdir, which is not supported on *BSD. Hence we have to implement our own
# logic for -t.
#
# The second parameter to this function is optional. It is ignored if the
# template ($1) is an absolute path. Conversely, if the template is a relative
# path and a second parameter is given, $2 is assumed to be the directory in
# which the temporary file should be created.
gsu_make_tempfile()
{
	local template="$1"
	local dir

	if [[ "${template:0:1}" != '/' ]]; then # relative path
		if (($# > 1)); then
			dir="$2"
		elif [[ -n "${TMPDIR:-}" ]]; then
			dir="$TMPDIR"
		else
			dir="/tmp"
		fi
		template="$dir/$template"
	fi
	result="$(mktemp "$template")"
	if (($? != 0)); then
		ret=-$E_GSU_MKTEMP
		result="template: $template"
		return
	fi
	ret=$GSU_SUCCESS
}