linux build line count bubble graph generator

#!/bin/sh
# ref: http://unix.stackexchange.com/questions/223746/why-is-the-linux-kernel-15-million-lines-of-code/223770#223770
# create a json to be used with this js bubble chart http://bl.ocks.org/mbostock/4063269
# 1. build the kernel with the chosen config
# 2. use the script with this argument $(find -name "*.cmd" | grep -v "/scripts/" )
wrap() {
    xargs=""
    deps=""
    out=""
    set -- $1
    while [ $# -gt 0 ]; do
        arg="$1"
        case "$arg" in
            -o) shift; out="$1.c" ;;
            *\.c) deps="$deps $arg" ;;
        esac
        shift
    done
    for dep in $deps; do
        cat "$dep" >"$dep-dep.c"
        size=$(wc -l <"$dep-dep.c")
        printf "%s %s %s\n" "$(dirname "$dep")" \
               "$(basename "$dep")" "$size" >> wc-data.tmp
    done
}
printf "" >wc-data.tmp
while [ $# -gt 0 ]; do
    args="$(sed -n 's/^.*\.o := gcc//p' "$1")"
    if [ ! -z "$args" ]; then
        wrap "$args"
    fi
    shift
done
printf "{\n   \"name\": \"tinyconfig\",\n" > graph.json
printf "   \"children\": [\n" >> graph.json
sort < wc-data.tmp | while read -r DIR NAME SIZE; do
    # printf "      $DIR $NAME $SIZE\n" >> grap.json
    if test "$line0" = "" ; then
        line0=1
        printf "         { \"name\": \"%s\",\n" "$DIR" >> graph.json
        printf "           \"children\": [\n" >> graph.json
        ODIR="$DIR"
    elif test "$DIR" != "$ODIR" ; then
        printf "\n            ]\n         },\n" >> graph.json
        printf "         { \"name\": \"%s\",\n" "$DIR" >> graph.json
        printf "           \"children\": [\n" >> graph.json
        ODIR="$DIR"
    else
        printf ",\n" >> graph.json
    fi
    printf "            { \"name\": \"%s\", \"size\": %s }" "$DIR/$NAME" "$SIZE" >> graph.json
done
printf "            ]\n         }\n" >> graph.json
printf "   ]\n}\n" >> graph.json