#!/bin/bash
#  $HeadURL$ $LastChangedRevision$

#  Modules
. $(miniade) || { echo "${0##*/}: ERROR: miniade failed (hint: run 'miniade' to see error)" >&2; exit 1; }

#  Configurable stuff

#  Other globals

main()
{
    local MY_ARGS
    local -a LINEINFILE_OPTS

    #  Defaults for options
    LOGIC=true
    PRESENT=unset
    BEFORE=unset
    AFTER=unset
    REPLACE=unset
    TEXT=unset
    FILE=unset

    #  Process options
    special_opts_handler()
    {
        case $1 in
            --present=*) LINEINFILE_OPTS=("${LINEINFILE_OPTS[@]}" "$1") ;;
            --before=*)  LINEINFILE_OPTS=("${LINEINFILE_OPTS[@]}" "$1") ;;
            --after=*)   LINEINFILE_OPTS=("${LINEINFILE_OPTS[@]}" "$1") ;;
            --replace=*) LINEINFILE_OPTS=("${LINEINFILE_OPTS[@]}" "$1") ;;
            --text=*)    LINEINFILE_OPTS=("${LINEINFILE_OPTS[@]}" "$1") ;;
            --file=*)    FILE=${1#*=} ;;
            *)           return 1 ;;
        esac
    }
    miniade_process_options --help-handler=help --special-opts-handler=special_opts_handler MY_ARGS "$@" && set -- "${MY_ARGS[@]}"

    #  Process arguments
    [ $# = 0 ] || miniade_bad_usage

    #  Sanity checks and derivations
    check_not_unset TEXT FILE
    [ -f "$FILE" ] || miniade_error "$FILE: not accessible"

    #  Guts
    TMP_FILE=$(mktemp)
    TMP2_FILE=$(mktemp)
    ini2txt < $FILE > $TMP_FILE
    miniade_debug 10 "main: calling [lineinfile --debug=$VERBOSELEVEL ${LINEINFILE_OPTS[*]} --file=$TMP_FILE] ..."
    lineinfile --debug=$VERBOSELEVEL "${LINEINFILE_OPTS[@]}" --file=$TMP_FILE
    txt2ini < $TMP_FILE > $TMP2_FILE
    rm -f $TMP_FILE
    cmp -s $FILE $TMP2_FILE || cat $TMP2_FILE > $FILE
    rm -f $TMP2_FILE
}

ini2txt()
{
    local LINE SECTION
    while read LINE; do
        if [[ $LINE =~ ^\[(.*)\]$ ]]; then
            SECTION=${BASH_REMATCH[1]}
        elif [[ $LINE =~ ^[\t\ ]*$ ]]; then
            :
        else
            echo "$SECTION:$LINE"
        fi
    done
}

txt2ini()
{
    local LINE SECTION
    local -A SECTIONS
    cat > /tmp/$PROGNAME.$$.txt2ini
    while read LINE; do
        [[ $LINE =~ ^([^:]*):.* ]]
        SECTIONS[${BASH_REMATCH[1]}]=whatever
    done < /tmp/$PROGNAME.$$.txt2ini
    for SECTION in "${!SECTIONS[@]}"; do
        echo "[$SECTION]"
        sed -n "s/^$SECTION://p" /tmp/$PROGNAME.$$.txt2ini
        echo
    done
}

check_not_unset()
{
    local VAR VAL
    for VAR in "$@"; do
        eval "VAL=\"\$$VAR\""
        miniade_debug 20 "check_not_unset: VAR=$VAR, VAL=$VAL"
        [ "X$VAL" != Xunset ] || miniade_bad_usage
    done
}

check_all_but_one_unset()
{
    local SET_COUNT UNSET_COUNT

    SET_COUNT=0
    UNSET_COUNT=0

    for VAR in "$@"; do
        eval "VAL=\$$VAR"
        miniade_debug 10 "check_all_but_one_unset: $VAR=$VAL"
        case $VAL in
            unset) ((++UNSET_COUNT)) ;;
            *)     ((++SET_COUNT)) ;;
        esac
    done

    [ $SET_COUNT = 1 ] || miniade_bad_usage
}

help()
{
    local PROGNAME

    miniade_get_progname PROGNAME
    echo "Usage: $PROGNAME [ <standard-options> ] --text=<text> --file=<file> [ --present=<text> ] --{before|after|replace}=<text>"
    exit 0
}

main "$@"