git-bz-rebase

git-bz-rebase

#!/bin/sh

usage="Usage: git bz-rebase BUG_NUMBER"

if [ -z "$1" ]; then
	echo "$usage" && exit 1
fi

if [ ! -x "$(which pup)" ]; then
	echo "pup is required for this to work"
	echo "To install it, run: go get github.com/ericchiang/pup"
	echo "You must have go installed and GOPATH set"
	exit 1
fi

run() {
	echo "$@" && eval "$@"
}

silent() {
	"$@" >/dev/null
}

first_patch_date() {
	wget -q -O- "http://bugs.koha-community.org/bugzilla3/attachment.cgi?bugid=$1&action=viewall&hide_obsolete=1" \
	| pup 'table.viewall_desc tr:nth-child(2) json{}' \
	| perl -MJSON -MList::Util=first -E '
		my $trs = JSON->new->decode(do { local $/; <STDIN> });
		$trs = ref $trs eq "ARRAY" ? $trs : [ $trs ];
		say ( ( first {
			defined $_->{children}[1]{children} and $_->{children}[1]{children}[0]{text} eq "patch"
		} @$trs )->{children}[2]{text} );
	'
}

branch_exists() {
	git show-ref --verify --quiet "refs/heads/$1"
}

current_branch() {
	git symbolic-ref --short HEAD
}

bugnumber=$1

date=$(first_patch_date $bugnumber)
if [ -z "$date" ]; then
	echo "Failed to find the date of the first patch for bug $bugnumber. Are you sure there are patches ?"
	exit 1
fi

if [ "$(current_branch)" != "rebase/bug/$bugnumber" ]; then
	branch_exists "rebase/bug/$bugnumber" && run silent git branch -D "rebase/bug/$bugnumber"
	run silent git checkout -b "rebase/bug/$bugnumber"
fi
commit=$(git rev-list -n 1 --before="'$date'" origin/master)
echo "Resetting HEAD to where origin/master was at $date"
run silent git reset --hard $commit
run git bz apply $bugnumber

echo ""
echo "If all patches were applied successfully, you can run: git rebase origin/master"