#!/bin/sh

# Yes, this intends to be a true POSIX script file.

set -e

myname="$0"

# Parse the tools' paths configuration

. "paths.mk"

doUsage() {

  cat <<_EOF_

Usage: ${myname} <dir> <base> <inc> [sed_re]

    Will renumber all patches found in 'dir', starting at 'base', and with

    an increment of 'inc'.

    If 'sed_re' is given, it is interpreted as a valid sed expression, and

    it will be applied to the patch name.

    If the environment variable FAKE is set to 'y', then the command will

    only be printed, and not executed (so you can check beforehand).

    Eg.:

      patch-renumber.sh patches/gcc/4.3.1 100 10

      patch-renumber.sh patches/gcc/4.2.4 100 10 's/(all[_-])*(gcc[-_])*//;'

_EOF_

}

[ $# -lt 3 -o $# -gt 4 ] && { doUsage; exit 1; }

[ -d "${1}" ] || { doUsage; exit 1; }

dir="${1}"

cpt="${2}"

inc="${3}"

sed_re="${4}"

case "$(LC_ALL=C hg id "${dir}" 2>/dev/null)" in

    "") CMD="";;

    *)  CMD="hg";;

esac

if [ "${FAKE}" = "y" ]; then

    CMD="echo ${CMD}"

fi

for p in "${dir}"/*.patch*; do

    [ -e "${p}" ] || { echo "No such file '${p}'"; exit 1; }

    newname="$(printf "%03d-%s"                                     \

                      "${cpt}"                                      \

                      "$( basename "${p}"                           \

                          |"${sed}" -r -e 's/^[[:digit:]]+[-_]//'   \

                                       -e "${sed_re}"               \

                        )"                                          \

              )"

    [ "${p}" = "${dir}/${newname}" ] || ${CMD} mv -v "${p}" "${dir}/${newname}"

    cpt=$((cpt+inc))

done