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# Idempotent refreshable operations

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apply_GETOPTS='pFn'

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APPLY=

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APPLY_FORCE=

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APPLY_DIFF=

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function apply_help {

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    cat <<END

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Apply:

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    -p      show changes

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    -F      force-updates without checking src mtime

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    -n      no-op/mock-update; don't actually change/deploy anything; implies -SpC

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END

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}

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function apply_opt {

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    local opt=$1

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    local optarg="$2"

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    case $opt in

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        p)  APPLY_DIFF=1   ;;

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        F)  APPLY_FORCE=1  ;;

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        n) 

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            APPLY=0

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            APPLY_DIFF=1

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        ;;

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        *)  return 1

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    esac

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}

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. $LIB/pvl/apply/dir.sh

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. $LIB/pvl/apply/link.sh

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. $LIB/pvl/apply/cmd.sh

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. $LIB/pvl/apply/cat.sh

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## Compare the given output file with all given source files:

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#

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#   check_update $out ${deps[@]} && do_update $out ... || ...

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#

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# Returns true if the output file needs to be updated.

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function apply_check {

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    local update=

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    local out="$1"

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    log_debug           "$out"

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    if [ ${#@} -eq 1 ]; then

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        log_changed     "  update: empty deps"

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        return 2

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    elif [ ! -e "$out" ]; then

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        log_changed     "  update: dest missing"

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        return 2

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    elif [ "$APPLY_FORCE" = 1 ]; then

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        log_changed     "  update: forced"

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        return 2

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    fi

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    # check deps

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    for dep in "${@:2}"; do

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        # check

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        if [ ! -e "$dep" ]; then

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            warn        "$out: Missing source: $dep"

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        elif [ "$out" -ot "$dep" ]; then

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            log_changed "   changed: $dep"

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            return 1

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        else

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            log_debug   "  check: $dep"

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        fi

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    done

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    log_debug           "  up-to-date"

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    return 0

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}