#!/bin/bash

#set -x

my_name="$( basename "${0}" )"

usage() {

    cat <<-_EOF_

		Usage:

		    ${my_name} <repos_dir> <M.m.p>

	_EOF_

}

repos="${1}"

version="${2}"

[ -n "${repos}"   ] || { usage; exit 1; }

[ -d "${repos}"   ] || { printf "${my_name}: ${repos}: no such file or directory\n"; exit 1; }

[ -n "${version}" ] || { usage; exit 1; }

gen_bound_revs() {

    r1=$( hg log    \

          |awk 'BEGIN {

                  found=0;

                }

                $1=="'"${label}"':" {

                  split($2,a,":"); rev=a[1];

                }

                $0~/^summary:[[:space:]]*[[:digit:]]+\.[[:digit:]]+: '"${msg}"'/ \

                && found==0 {

                  printf( "%d\n", rev ); found=1;

                }'

        )

    r2=$( hg log -b "${branch}" \

          |awk '$1=="changeset:" {

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

                  printf( "%d\n", a[1] );

                  nextfile;

                }'

        )

    r1_log=$((r1+log_offset))

    if [ ${#r1_log} -gt ${#r2} ]; then

        rev_w=${#r1_log}

    else

        rev_w=${#r2}

    fi

}

print_intro_mail() {

    cat <<-_EOF_

		Hello all!

		I'm pleased to announce the release of crosstool-NG ${version}!

		As usual, there has been quite a number of improvements, new features,

		and bug fixes all around. The most notable changes are listed below:

		YEM:

		YEM: PUT YOUR MESSAGE HERE

		YEM:

		This marks the beginning of the ${ver_M}.${ver_m} maintenance branch, and the end of

		the previous maintenance branch. As always, comments and suggestions

		are most welcome!

		The release can be found at the following URLs:

		Changelog: http://ymorin.is-a-geek.org/download/crosstool-ng/crosstool-ng-${version}.changelog

		Tarball:   http://ymorin.is-a-geek.org/download/crosstool-ng/crosstool-ng-${version}.tar.bz2

		Patches:   http://ymorin.is-a-geek.org/download/crosstool-ng/01-fixes/${version}

		As a reminder, the home for crosstool-NG is:

		http://ymorin.is-a-geek.org/projects/crosstool

		Crosstool-NG also has a Freshmeat page:

		http://freshmeat.net/projects/crosstool-ng/

	_EOF_

}

print_intro_changelog_full_release() {

    cat <<-_EOF_

		crosstool-NG ${version} -- ${date}

		This is a feature-release. Significant changes are:

		YEM:

		YEM: PUT YOUR MESSAGE HERE

		YEM:

	_EOF_

}

print_intro_changelog_bug_fix() {

    cat <<-_EOF_

		crosstool-NG ${version} -- ${date}

		This is a bug-fix-only release.

	_EOF_

}

print_author_stats() {

    printf "\nMany thanks to the people who contributed to this release:\n\n"

    prev_author=""

    template='{author|person}\n'

    hg log -b "${branch}" -r "${r1_log}:${r2}"                  \

           --template "${template}"                             \

    |sed -r -e 's/"//g;'                                        \

    |awk -F '' '{

                  nb[$0]++;

                }

                END {

                  for( author in nb ) {

                    printf( "   %4d  %s\n", nb[author], author );

                  }

                }'                                              \

    |sort -rn

}

print_author_shortlog() {

    printf "\nHere is the per-author shortlog:\n"

    prev_author=""

    template='{author|person}|{rev}|{branches}|{desc|firstline}\n'

    hg log -b "${branch}" -r "${r1_log}:${r2}"              \

           --template "${template}"                         \

    |awk -F '' '{

                  n=split( $0,a,"|" );

                  printf( "%s", gensub("\"","","g",a[1]) );

                  printf( "|%0*d", '${rev_w}', a[2] );

                  for(i=3;i<=n;i++) {

                    printf( "|%s", a[i] );

                  }

                  printf( "\n" );

                }'                                          \

    |sort                                                   \

    |while read line; do

        author="$( echo "${line}" |cut -d \| -f 1 )"

        rev="$( echo "${line}" |cut -d \| -f 2 )"

        br="$( echo "${line}" |cut -d \| -f 3 )"

        desc="$( echo "${line}" |cut -d \| -f 4- )"

        case "${br}" in

            ${branch})  ;;

            [0-9]*.*)    continue;;

            *) ;;

        esac

        case "${desc}" in

            Merge.)                 continue;;

            *": close "*" branch"*) continue;;

#           *\(merged\))            continue;;

        esac

        author="$( echo "${author}" |sed -r -e 's/"//g;' )"

        if [ ! "${prev_author}" = "${author}" ]; then

            printf "\n"

            printf "    ${author}:\n"

            prev_author="${author}"

        fi

        rev="$( echo "${rev}" |sed -r -e 's/^0*//;' )"

        printf "%s\n" "${desc}"     \

        |fmt -w 65                  \

        |(first=1; while read l; do

            if [ -n "${first}" ]; then

                printf "        [%*d] %s\n" ${rev_w} ${rev} "${l}"

                first=

            else

                printf "         %*.*s  %s\n" ${rev_w} ${rev_w} '' "${l}"

            fi

        done)

    done

}

print_diffstat() {

    printf "\nThe diffstat follows:\n\n"

    hg diff -r "${r1}:${r2}" --color=never  \

    |diffstat -r 2 -p 1 -w 10               \

    |tail -n 1                              \

    |sed -r -e 's/^ */    /;'

    hg diff -r "${r1}:${r2}" --color=never  \

    |diffstat -f 1 -r 2 -p 1 -w 10          \

    |head -n -1                             \

    |while read file line; do

        if [ ${#file} -gt 57 ]; then

            file="...$( echo "${file}" |sed -r -e 's/^.*(.{54})$/\1/;' )"

        fi

        printf "    %-57s %s\n" "${file}" "${line}"

    done

}

ver_M="$( printf "${version}" |cut -d . -f 1 )"

ver_m="$( printf "${version}" |cut -d . -f 2 )"

ver_p="$( printf "${version}" |cut -d . -f 3 )"

prefix="$(pwd)/crosstool-ng-${version}"

pushd "${repos}" >/dev/null 2>&1

printf "Checking for existing tag: "

if hg tags |grep -E '^'"crosstool-ng-${version}"'\>' >/dev/null; then

    printf "already tagged\n"

    exit 1

fi

printf "no\n"

if [ ${ver_p} -eq 0 ]; then

    print_mail="yes"

    print_intro_changelog="print_intro_changelog_full_release"

    label="parent"

    msg="create maintenance branch, (update|bump) version to [[:digit:]]+"'\'".[[:digit:]]+"'\'".0"'$'

    branch="default"

    log_offset=0

else

    print_mail="no"

    print_intro_changelog="print_intro_changelog_bug_fix"

    label="changeset"

    msg="(update|bump) version to ${ver_M}"'\'".${ver_m}"'\'".$((ver_p-1))"'\+hg$'

    branch="${ver_M}.${ver_m}"

    log_offset=1

fi

printf "Computing boundary revisions:"

gen_bound_revs

printf " %d:%d\n" ${r1} ${r2}

printf "Tagging release:"

hg up "${branch}" >/dev/null

if [ ${ver_p} -eq 0 ]; then

    printf " update version"

    hg branch "${ver_M}.${ver_m}" >/dev/null

    echo "${version}" >".version"

    hg ci -m "${ver_M}.${ver_m}: create maintenance branch, update version to ${version}"

else

    printf " update version"

    echo "${version}" >".version"

    hg ci -m "${ver_M}.${ver_m}: update version to ${version}"

fi

printf ", tag"

hg tag -m "Tagging release ${version}" crosstool-ng-${version}

printf ", update version"

echo "${version}+hg" >".version"

hg ci -m "${ver_M}.${ver_m}: update version to ${version}+hg"

printf ", date"

date="$( hg log -r crosstool-ng-${version} --template '{date|isodate}\n'    \

         |sed -r -e 's/-|://g; s/ /./; s/ //;'                              \

       )"

printf ", done.\n"

if [ ${ver_p} -eq 0 ]; then

    printf "Generating release mail:"

    printf " intro"

    print_intro_mail        > "${prefix}.mail"

    printf ", stats"

    print_author_stats      >>"${prefix}.mail"

    printf ", shortlog"

    print_author_shortlog   >>"${prefix}.mail"

    printf ", done.\n"

fi

printf "Generating release changelog:"

printf " intro"

${print_intro_changelog}    > "${prefix}.changelog"

printf ", stats"

print_author_stats          >>"${prefix}.changelog"

printf ", shortlog"

print_author_shortlog       >>"${prefix}.changelog"

printf ", diffstat"

print_diffstat              >>"${prefix}.changelog"

printf ", done.\n"

popd >/dev/null 2>&1

printf "Creating tarball:"

prefix="crosstool-ng-${version}"

printf " cloning"

hg clone "${repos}" "${prefix}" >/dev/null

hg up -R "${prefix}" "${prefix}" >/dev/null

date="$( hg log -R "${prefix}" -r "${prefix}" --template '{date|rfc822date}\n' )"

printf ", purging"

rm -rf "${prefix}/"{.hg,.hgtags,.hgignore}

printf ", tarball"

tar cjf "${prefix}.tar.bz2" "${prefix}"

printf ", sum"

for s in md5 sha1 sha512; do

    ${s}sum "${prefix}.tar.bz2" >"${prefix}.tar.bz2.${s}"

done

printf ", cleaning"

rm -rf "${prefix}"

printf ", touch"

touch -d "${date}" "${prefix}"*

printf ", done.\n"

if [ ${ver_p} -eq 0 ]; then

    printf "\nAn editor will be launched for you to edit the mail.\n"

    read -p "Press enter when ready..." foo

	cp "${prefix}.mail"{,.orig}

    vi "${prefix}.mail"

	diff -du -U 1 "${prefix}.mail"{.orig,} |patch -p0 "${prefix}.changelog" >/dev/null

fi

printf "\nAn editor will be launched for you to review the changelog.\n"

read -p "Press enter when ready..." foo

vi "${prefix}.changelog"

printf "\nNow, you can push the changes with:   hg push -R '${repos}'\n"