#!/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