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readonly SESSION_DIR="$(cd $(dirname ${BASH_SOURCE[0]}) ; pwd)"
readonly WIZARD_DIR="${SESSION_DIR}"/install
readonly SESSION_INCLUDE_FILENAME=session-common.sh.inc # this file
readonly SESSION_STATE_FILENAME=.session_state
readonly TRANSLATIONS_FILENAME=translations.sh.inc
readonly CHROOT_ENVIRONMENT_FILENAME=chroot-environment.sh
readonly CHROOT_LOGIN_FILENAME=chroot-login.sh
readonly CHROOT_SERVICES_FILENAME=chroot-services.sh
readonly SESSION_INCLUDE_FILE="${SESSION_DIR}"/${SESSION_INCLUDE_FILENAME} # this file
readonly SESSION_STATE_FILE="${SESSION_DIR}"/${SESSION_STATE_FILENAME}
readonly TRANSLATIONS_FILE="${SESSION_DIR}"/${TRANSLATIONS_FILENAME}
readonly CHROOT_ENVIRONMENT_FILE="${WIZARD_DIR}"/${CHROOT_ENVIRONMENT_FILENAME}
readonly CHROOT_LOGIN_FILE="${WIZARD_DIR}"/${CHROOT_LOGIN_FILENAME}
readonly CHROOT_SERVICES_FILE="${WIZARD_DIR}"/${CHROOT_SERVICES_FILENAME}
## sanity checks ##
! which dialog &> /dev/null && echo "can not find the \`dialog\` program" && exit
(( $EUID )) && echo "this program requires superuser privilege" && exit
## state helpers ##
SetStateVar() # (var_name value*)
{
local var_name=$1 ; shift ;
local value=$*
sed -i "/^${var_name}=.*/d" "${SESSION_STATE_FILE}"
echo "${var_name}=${value}" >> "${SESSION_STATE_FILE}"
}
GetStateVar() # (var_name [def_value])
{
local var_name=$1
local def_value=$2
local stored_value=$(grep "${var_name}=" "${SESSION_STATE_FILE}" | cut -d '=' -f 2)
if [[ -n "${stored_value}" ]] && [[ "${stored_value}" != '_UNDEFINED_' ]]
then echo ${stored_value}
else echo ${def_value}
fi
}
## dialog prompt helpers ##
InitDlg() # (title prompt default_option options*)
{
declare -l title="$1"
declare -l prompt="$2"
declare -l default_option="$3"
declare -l options=("${@:4}")
dialog --stdout --sleep 1 --timeout 30 --no-tags --no-cancel \
--backtitle "$title" \
--default-item "${default_option}" \
--menu "$prompt" $H $W $N_ITEMS "${options[@]}"
}
WizardDlg() # (title dialog_args*)
{
declare -l title="$1"
declare -l options=("${@:2}")
# when the "Cancel" button or <ESC> key is pressed, in a '--msgbox',
# dialog exits with status 1; but nothing is printed to STDOUT
# install.sh runs under `set -e`; so we can not propogate the non-zero status,
# otherwise, callers would need to supress it
# callers should instead, exit upon the empty result, when a selection is mandatory
#
# the exception is '--yesno' dialogs, which exits with status 1 for the 'No' button
# the non-zero status is propogated for '--yesno' dialogs; and callers must handle it
# ASSERT: '--yesno' dialogs should pass '--yesno' as positional parameter #2 (options[0])
dialog --stdout --sleep 1 \
--backtitle "${TR[wizard-${TR_KEY}]}" \
--title "${title}" "${options[@]}" || \
( (( $? == 1 )) && [[ "${options[0]}" != '--yesno' ]] )
clear >&2
}
## error logging helpers ##
LogError() # (source_file func_name line_n)
{
local SOURCE_FILE="$1"
local FUNC_NAME="$( [[ -n "$2" ]] && echo "$2" || echo "${SOURCE_FILE}" )"
local LINE_N=$3
local N_CONTEXT_LINES=3
local N_LINES=$(( 1 + (2 * N_CONTEXT_LINES) ))
local BEGIN_LINE_N=$(( LINE_N - N_CONTEXT_LINES ))
local END_LINE_N=$(( LINE_N + N_CONTEXT_LINES ))
local marker line
echo "ERROR: in ${FUNC_NAME}::${LINE_N}" >&2
sed 's|\\$||' "${SOURCE_FILE}" | pr -tn | \
tail -n +${BEGIN_LINE_N} | head -n ${N_LINES} | tr '\n' '\n' | \
while read line
do line_n=$(sed -E 's|([0-9]+).*|\1|' <<<${line})
(( line_n == LINE_N )) && marker='==>' || marker=' '
printf "%s %s\n" "${marker}" "${line}" >&2
done
}
## translations for user-facing strings ##
readonly TRANSLATIONS=" en es gl pt " # pending translations 'eo' 'fr' 'it' 'pl'
readonly TR_KEY=$(GetStateVar 'TR_KEY' 'en')
source "${TRANSLATIONS_FILE}"
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