#!/bin/sh
#
# An example hook script to mail out commit update information.
# It also blocks tags that aren't annotated.
# Called by git-receive-pack with arguments: refname sha1-old sha1-new
#
# To enable this hook:
# (1) change the recipient e-mail address
# (2) make this file executable by "chmod +x update".
#

project="xf86-video-radeonhd"
recipients="radeonhd@opensuse.org"
site="http://gitweb.freedesktop.org/?p=xorg/driver/xf86-video-radeonhd"
giturl="git://anongit.freedesktop.org/xorg/driver/xf86-video-radeonhd"

ref_type=$(git cat-file -t "$3")

# Only allow annotated tags in a shared repo
# Remove this code to treat dumb tags the same as everything else
case "$1","$ref_type" in
refs/tags/*,commit)
	echo "*** Un-annotated tags are not allowed in this repo" >&2
	echo "*** Use 'git tag [ -a | -s ]' for tags you want to propagate."
	exit 1;;
refs/tags/*,tag)
	echo "### Pushing version '${1##refs/tags/}' to the masses" >&2
	# recipients="release-announce@somwehere.com announce@somewhereelse.com"
	;;
esac

# set this  to 'cat' to get a very detailed listing.
# short only kicks in when an annotated tag is added
short='git shortlog'

# see 'date --help' for info on how to write this
# The default is a human-readable iso8601-like format with minute
# precision ('2006-01-25 15:58 +0100' for example)
date_format="%F %R %z"

if expr "$2" : '0*$' >/dev/null
then
        (
	# new ref
	case "$1" in
	refs/tags/*)
		# a pushed and annotated tag (usually) means a new version
		tag="${1##refs/tags/}"
		if [ "$ref_type" = tag ]; then
			eval $(git cat-file tag $3 | \
				sed -n '4s/tagger \([^>]*>\)[^0-9]*\([0-9]*\).*/tagger="\1" ts="\2"/p')
			date=$(date --date="1970-01-01 00:00:00 $ts seconds" +"$date_format")
			echo "Tag '$tag' created by $tagger at $date"
			git cat-file tag $3 | sed -n '5,$p'
			echo
		fi
		prev=$(git describe "$3^" | sed 's/-g.*//')
		# the first tag in a repo will yield no $prev
		if [ -z "$prev" ]; then
			echo "Changes since the dawn of time:"
			git rev-list --pretty $3 | $short
		else
			echo "Changes since $prev:"
			git rev-list --pretty $prev..$3 | $short
			echo ---
			git diff $prev..$3 | diffstat -p1
			echo ---
		fi
		;;

	refs/heads/*)
		branch="${1##refs/heads/}"
		echo "New branch '$branch' available with the following commits:"
		git-rev-list --pretty "$3" $(git-rev-parse --not --all)
		;;
	esac) |
        mail -s "$project: Changes to '${1##refs/heads/}'" $recipients

else 
    base=$(git-merge-base "$2" "$3")
    refs=$(git-rev-list "$3" "^$base")
    commits=$(echo "$refs" | wc -l)
    branch="${1##refs/heads/}"
    description="$(cat $GIT_DIR/description)"

    (
        echo "Reporting from $project: $description"
        echo
        echo "Please visit:"
        echo "    $site"
        echo "Or get your own copy by using:"
        echo "    git-clone $giturl"
        echo

        if [ "$commits" == "1" ]; then
            commitmsg="Commit"
        else
            commitmsg="$commits commits"
        fi

        if [ "$branch" == "$2" ]; then
            echo "$commitmsg against HEAD of $branch:"
        else
            commitish=${base:0:8}
            echo "$commitmsg against $branch at ${base:0:8}...:"
        fi

        if [ "$commits" != "1" ]; then
            git diff "$3" "^$base" | diffstat -p1
            echo
            echo
        fi
        
        for ref in $refs; do
            git-rev-list --max-count=1 --pretty $ref
            echo "diffstat:"
            git-show $ref | diffstat -p1 -w76 | sed s/^/\ \ \ /
            echo
            echo "gitweb url:"
            echo "$site;a=commit;h=${3:0:8}"
            echo
            echo
        done
     ) |
     mail -s "$project:$branch: $commits commit(s)" $recipients
fi
exit 0