#!/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".
#

# prevent pushing from anyone but the logerrit user
if [ "$(id -u -n )" != "logerrit" ] ; then
       echo "*** The reference for this repo is gerrit. do not push directly to fdo" >&2
       exit 1
fi
from="\"$(git show -s --pretty=format:'%an' $3^{}) (via logerrit)\" <logerrit@kemper.freedesktop.org>"

project=$(cat $GIT_DIR/description)
recipients="libreoffice-commits@lists.freedesktop.org"

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

# Avoid re-introducing obsolete tags
if grep -q "^$1$" hooks/obsolete-tags; then
	echo "*** Re-introducing an obsolete tag ($1) is not allowed in this repo" >&2
	echo "*** Use corereleasebranches/killtagslocal.sh from contrib/dev-tools.git to get rid of them." >&2
	exit 1
fi

# 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"

# Set to the number of pathname components you want in the subject line to
# indicate which components of a project changed.
num_path_components=2

# Set subject
repo=$(basename $(cd $GIT_DIR ; pwd))
if expr "$2" : '0*$' >/dev/null ; then
	subject="$repo: Changes to '${1##refs/heads/}'"
else
	base=$(git-merge-base "$2" "$3")
	subject=$(git-diff-tree -r --name-only "$base" "$3" |
	          cut -d/ -f-$num_path_components | sort -u | xargs echo -n)
        commits=$(git-rev-list "$3" "^$base" | wc -l)
	if [ "$commits" -ne 1 ] ; then
		subject="$commits commits - $subject"
	fi
	branch="${1##refs/heads/}"
	if [ "$branch" != "master" ] ; then
		subject="Branch '$branch' - $subject"
	fi
	subject="$repo: $subject"
fi

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" $(git-rev-parse --not --all)
		;;
	esac
else
	case "$base" in
	"$2")
		git diff "$3" "^$base" | diffstat -p1
		echo
		echo "New commits:"
		;;
	*)
		echo "Rebased ref, commits from common ancestor:"
		;;
	esac
	bytes=0
	IFS="$(echo)"
	git-rev-list "$3" "^$base" | while read rev; do git-show -M --pretty=fuller $rev; done | sed 's#\\#\\\\#g' |
		while read line
		do
			if [ "$bytes" -ge "0" ] ; then
				bytes=$(( $bytes + ${#line} + 1 ))
				if [ "$bytes" -gt "100000" ] ; then
					bytes=-1
					echo -e "\n... etc. - the rest is truncated"
				else
					echo "$line"
				fi
			fi
		done
fi |
mail -s "$subject" -a "X-Git-Repository: https://git.libreoffice.org/core" \
     -a "List-Post: <mailto:libreoffice@lists.freedesktop.org>" -a "From: $from" $recipients
exit 0