#!/bin/sh
#
# 2011-2013 Nico Schottelius (nico-cdist at schottelius.org)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#
#
# This file contains the heavy lifting found usually in the Makefile
#

basedir=${0%/*}/../
# Change to checkout directory
cd "$basedir"

version=$(git describe)

option=$1; shift

case "$option" in
    changelog-changes)
        if [ "$#" -eq 1 ]; then
            start=$1
        else
            start="[[:digit:]]"
        fi

        end="[[:digit:]]"

        awk -F: "BEGIN { start=0 }
            {
                if(start == 0) {
                    if (\$0 ~ /^$start/) {
                        start = 1
                    }
                } else {
                    if (\$0 ~ /^$end/) {
                        exit
                    } else {
                        print \$0 
                    }
                }
            }" "$basedir/docs/changelog"
    ;;

    changelog-version)
        # get version from changelog
        grep '^[[:digit:]]' "$basedir/docs/changelog" | head -n1 | sed 's/:.*//'
    ;;

    check-date)
        # verify date in changelog is today
        date_today="$(date +%Y-%m-%d)"
        date_changelog=$(grep '^[[:digit:]]' "$basedir/docs/changelog" | head -n1 | sed 's/.*: //')

        if [ "$date_today" != "$date_changelog" ]; then
            echo "Date in changelog is not today"
            echo "Changelog: $date_changelog"
            exit 1
        fi
    ;;

    check-unittest)
        "$0" test
    ;;

    blog)
        version=$1; shift
        blogfile=$1; shift
        dir=${blogfile%/*}
        file=${blogfile##*/}


        cat << eof > "$blogfile"
[[!meta title="Cdist $version released"]]

Here's a short overview about the changes found in version ${version}:

eof

        $0 changelog-changes "$version" >> "$blogfile"

        cat << eof >> "$blogfile"
For more information visit the [[cdist homepage|software/cdist]].

[[!tag cdist config unix]]
eof
        cd "$dir"
        git add "$file"
        # Allow git commit to fail if there are no changes
        git commit -m "cdist blog update: $version" "$blogfile" || true
    ;;

    ml-release)
        if [ $# -ne 1 ]; then
            echo "$0 ml-release version" >&2
            exit 1
        fi

        version=$1; shift

        to_a=cdist
        to_d=l.schottelius.org
        to=${to_a}@${to_d}

        from_a=nico-cdist
        from_d=schottelius.org
        from=${from_a}@${from_d}

        ( 
        cat << eof
From: Nico -telmich- Schottelius <$from>
To: cdist mailing list <$to>
Subject: cdist $version released

Hello .*,

cdist $version has been released with the following changes:

eof

        "$0" changelog-changes "$version"
        cat << eof

Cheers,

Nico

-- 
Automatisation at its best level. With cdist.
eof
        ) | /usr/sbin/sendmail -f "$from" "$to"
    ;;


    release-git-tag)
        target_version=$($0 changelog-version)
        if git rev-parse --verify refs/tags/$target_version 2>/dev/null; then
            echo "Tag for $target_version exists, aborting"
            exit 1
        fi
        printf "Enter tag description for ${target_version}: "
        read tagmessage
        git tag "$target_version" -m "$$tagmessage"
    ;;

    release)
        set -e
        target_version=$($0 changelog-version)
        target_branch=$($0 version-branch)

        echo "Beginning release process for $target_version"

        # First check everything is sane
        "$0" check-date
        "$0" check-unittest

        # Generate version file to be included in packaging
        "$0" version

        # Ensure the git status is clean, else abort
        if ! git diff-index --name-only --exit-code HEAD ; then
            echo "Unclean tree, see files above, aborting"
            exit 1
        fi

        # Ensure we are on the master branch
        masterbranch=yes
        if [ "$(git rev-parse --abbrev-ref HEAD)" != "master" ]; then
            echo "Releases are happening from the master branch, aborting"

            echo "Enter the magic word to release anyway"
            read magicword

            if [ "$magicword" = "iknowwhatido" ]; then
                masterbranch=no
            else
                exit 1
            fi
        fi

        if [ "$masterbranch" = yes ]; then
            # Ensure version branch exists
            if ! git rev-parse --verify refs/heads/$target_branch 2>/dev/null; then
                git branch "$target_branch"
            fi

            # Merge master branch into version branch
            git checkout "$target_branch"
            git merge master
        fi

        # Verify that after the merge everything works
        "$0" check-date
        "$0" check-unittest

        # Generate man pages (indirect check if they build)
        make man

        # Generate speeches (indirect check if they build)
        make speeches

        ############################################################# 
        # Everything green, let's do the release

        # Tag the current commit
        "$0" release-git-tag

        # Also merge back the version branch
        if [ "$masterbranch" = yes ]; then
            git checkout master
            git merge "$target_branch"
        fi

        # Publish git changes
        make pub

        # publish man, speeches, website
        if [ "$masterbranch" = yes ]; then
            make web-release-all
        else
            make web-release-all-no-latest
        fi

        # Ensure that pypi release has the right version
        "$0" version

        # Create and publish package for pypi
        make pypi-release

        # Archlinux release is based on pypi
        make archlinux-release

        # Announce change on ML
        make ml-release

        cat << eof
Manual steps post release:

    - linkedin
    - hackernews
    - reddit
    - twitter

eof

    ;;

    test)
        export PYTHONPATH="$(pwd -P)"

        if [ $# -lt 1 ]; then
            python3 -m cdist.test
        else
            python3 -m unittest "$@"
        fi
    ;;

    version-branch)
        "$0" changelog-version | cut -d. -f '1,2'
    ;;

    version)
        echo "VERSION = \"$(git describe)\"" > cdist/version.py
    ;;

    *)
        echo "Unknown helper target $@ - aborting"
        exit 1
    ;;

esac