source: MondoRescue/branches/2.2.9/mindi-busybox/scripts/gen_build_files.sh@ 2725

#!/bin/sh

test $# -ge 2 || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }

# cd to objtree
cd -- "$2" || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }
# In separate objtree build, include/ might not exist yet
mkdir include 2>/dev/null

srctree="$1"

status() { printf '  %-8s%s\n' "$1" "$2"; }
gen() { status "GEN" "$@"; }
chk() { status "CHK" "$@"; }

generate()
{
    local src="$1" dst="$2" header="$3" insert="$4"
    #chk "${dst}"
    (
        printf "%s\n" "${header}"
        if grep -qs '^INSERT$' "${src}"; then
            sed -n '1,/^INSERT$/p' "${src}"
            printf "%s\n" "${insert}"
            sed -n '/^INSERT$/,$p' "${src}"
        else
            if [ -n "${insert}" ]; then
                printf "%s\n" "ERROR: INSERT line missing in: ${src}" 1>&2
            fi
            cat "${src}"
        fi
    ) | sed '/^INSERT$/d' > "${dst}.tmp"
    if ! cmp -s "${dst}" "${dst}.tmp"; then
        gen "${dst}"
        mv "${dst}.tmp" "${dst}"
    else
        rm -f "${dst}.tmp"
    fi
}

# (Re)generate include/applets.h
s=`sed -n 's@^//applet:@@p' -- "$srctree"/*/*.c "$srctree"/*/*/*.c`
generate \
    "$srctree/include/applets.src.h" \
    "include/applets.h" \
    "/* DO NOT EDIT. This file is generated from applets.src.h */" \
    "${s}"

# (Re)generate include/usage.h
# We add line continuation backslash after each line,
# and insert empty line before each line which doesn't start
# with space or tab
# (note: we need to use \\\\ because of ``)
s=`sed -n -e 's@^//usage:\([ \t].*\)$@\1 \\\\@p' -e 's@^//usage:\([^ \t].*\)$@\n\1 \\\\@p' -- "$srctree"/*/*.c "$srctree"/*/*/*.c`
generate \
    "$srctree/include/usage.src.h" \
    "include/usage.h" \
    "/* DO NOT EDIT. This file is generated from usage.src.h */" \
    "${s}"

# (Re)generate */Kbuild and */Config.in
{ cd -- "$srctree" && find . -type d; } | while read -r d; do
    d="${d#./}"

    src="$srctree/$d/Kbuild.src"
    dst="$d/Kbuild"
    if test -f "$src"; then
        mkdir -p -- "$d" 2>/dev/null

        s=`sed -n 's@^//kbuild:@@p' -- "$srctree/$d"/*.c`
        generate \
            "${src}" "${dst}" \
            "# DO NOT EDIT. This file is generated from Kbuild.src" \
            "${s}"
    fi

    src="$srctree/$d/Config.src"
    dst="$d/Config.in"
    if test -f "$src"; then
        mkdir -p -- "$d" 2>/dev/null

        s=`sed -n 's@^//config:@@p' -- "$srctree/$d"/*.c`
        generate \
            "${src}" "${dst}" \
            "# DO NOT EDIT. This file is generated from Config.src" \
            "${s}"
    fi
done

# Last read failed. This is normal. Don't exit with its error code:
exit 0