#!/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