#!/bin/sh

 repos="$1"

 pdir="$2"

 if [ -z "${repos}" -o ! -d "${repos}" -o -z "${pdir}" -o ! -d "${pdir}" ];then

     printf "Usage: ${0##*/} <repos_dir> <patch_dir>\n"

     exit 1

 fi

 pdir="$( cd "${pdir}"; pwd)"

 version="$( echo "${pdir}" |sed -r -e 's,.*/([^/]+)/*$,\1,' )"

 branch="${version%.*}"

 n=$( ls -1 "${pdir}" 2>/dev/null |wc -l )

 r1="$( hg -R "${repos}" log -b "${branch}"  \

        |awk '

             $1=="changeset:" {

                 prev=rev;

                 split($2,a,":");

                 rev=a[1];

             }

             $0~/^summary:[[:space:]]+'"${branch}: (bump|update) version to ${version}\+hg"'$/ {

                 printf( "%d\n", prev );

             }

             '

      )"

 i=0

 hg -R "${repos}" log -b "${branch}" -r "${r1}:tip" --template '{rev}\n'    \

 |while read rev; do

     p="$( printf "%03d" ${i} )"

     i=$((i+1))

     if [ $( ls -1 "${pdir}/${p}-"*.patch 2>/dev/null |wc -l ) -ne 0 ]; then

         continue

     fi

     plog=$( hg -R "${repos}" log -r ${rev} --template '{desc|firstline}\n'  \

             |sed -r -e 's,[^[:alnum:]],_,g; s/_+/_/g;'                      \

           )

     pname="${p}-${plog}.patch"

     printf "Revision '%d' --> '%s'\n" ${rev} "${pname}"

     hg -R "${repos}" diff -c ${rev} --color=never >"${pdir}/${pname}"

     pdate="$( hg -R "${repos}" log -r ${rev} --template '{date|isodate}\n' )"

     touch -d "${pdate}" "${pdir}/${pname}"

 done