scripts: output renumbered patches in a new directory

When renumbering patches, the original patches get removed and replaced
with the new ones. This can be annoying to loose the original patches.
Fix this by putting the new patchs in a directory of their own.

scripts/patch-renumber.sh

@@ -9,37 +9,47 @@ myname="$0"
 
 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'.
+Usage: ${myname} <src_dir> <dst_dir> <base> <inc> [sed_re]
+    Renumbers all patches found in 'src_dir', starting at 'base', with an
+    increment of 'inc', and puts the renumbered patches in 'dst_dir'.
+    Leading digits are replaced with the new indexes, and a subsequent '_'
+    is replaced with a '-'.
     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).
+    is be applied to the patch name.
+    If the environment variable FAKE is set to 'y', then nothing gets done,
+    the command to run is only be printed, and not executed (so you can
+    check beforehand).
+    'dst_dir' must not yet exist.
     Eg.:
-      patch-renumber.sh patches/gcc/4.3.1 100 10
-      patch-renumber.sh patches/gcc/4.2.4 100 10 's/(all[_-])*(gcc[-_])*//;'
+      patch-renumber.sh patches/gcc/4.2.3 patches/gcc/4.2.4 100 10
+      patch-renumber.sh /some/dir/my-patches patches/gcc/4.3.1 100 10 's/(all[_-])*(gcc[-_])*//;'
 _EOF_
 }
 
-[ $# -lt 3 -o $# -gt 4 ] && { doUsage; exit 1; }
-[ -d "${1}" ] || { doUsage; exit 1; }
+[ $# -lt 4 -o $# -gt 5 ] && { 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 ${CMD}"
+src="${1}"
+dst="${2}"
+cpt="${3}"
+inc="${4}"
+sed_re="${5}"
+if [ ! -d "${src}" ]; then
+    printf "%s: '%s': not a directory\n" "${myname}" "${src}"
+    exit 1
+fi
+if [ -d "${dst}" ]; then
+    printf "%s: '%s': directory already exists\n" "${myname}" "${dst}"
+    exit 1
 fi
 
-for p in "${dir}"/*.patch*; do
+Q=
+if [ -n "${FAKE}" ]; then
+    printf "%s: won't do anything: FAKE='%s'\n" "${myname}" "${FAKE}"
+    Q="echo"
+fi
+
+${Q} mkdir -pv "${dst}"
+for p in "${src}/"*.patch*; do
     [ -e "${p}" ] || { echo "No such file '${p}'"; exit 1; }
     newname="$(printf "%03d-%s"                                     \
                       "${cpt}"                                      \
@@ -48,6 +58,6 @@ for p in "${dir}"/*.patch*; do
                                        -e "${sed_re}"               \
                         )"                                          \
               )"
-    [ "${p}" = "${dir}/${newname}" ] || ${CMD} mv -v "${p}" "${dir}/${newname}"
+    ${Q} cp -v "${p}" "${dst}/${newname}"
     cpt=$((cpt+inc))
 done