#!/bin/sh

# git update hook to check that pushed changes don't introduce new flake8
# errors

# --- Command line
refname="$1"
oldrev="$2"
newrev="$3"

# --- Safety check
if [ -z "$GIT_DIR" ]; then
	echo "Don't run this script from the command line." >&2
	echo " (if you want, you could supply GIT_DIR then run" >&2
	echo "  $0 <ref> <oldrev> <newrev>)" >&2
	exit 1
fi

if [ -z "$refname" -o -z "$oldrev" -o -z "$newrev" ]; then
	echo "usage: $0 <ref> <oldrev> <newrev>" >&2
	exit 1
fi


TMPDIR=`mktemp -d`
TMPDIFF=`tempfile`

[ $refname != "refs/heads/master" -a $refname != "refs/heads/stable" ] && exit 0

# select only changed python files which are not migrations
changed=`git diff --name-only $oldrev $newrev | grep 'py$' | grep -v 'migrations/[0-9]'`
if [ -z $changed ] ; then
    # Nothing to check. Note the exit is necessary -- we would not pass any
    # paths to git diff below and it would output the diff unfiltered.
    exit 0
fi

git diff --unified=1 $oldrev $newrev -- $changed >${TMPDIFF}

# there is no working tree in bare git repository, so we recreate it for flake8
git archive $newrev | tar -x -C ${TMPDIR}

cd ${TMPDIR}
# report only errors on lines in diff
# (if threre was flake8 installed on atrey, we could just call flake8)
/akce/MaM/WWW/mamweb-test/bin/flake8 --diff <${TMPDIFF}
status=$?
if [ $status != 0 ] ; then
    echo
    echo -n "Změny, které se snažíte pushnout, obsahují kód v pythonu "
    echo -n "nevyhovující flake8 (viz výše). Opravte je a zkuste to znovu. "
    echo -n "Nezapomeňte, že můžete editovat historii (git commit --amend, "
    echo -n "git rebase -i). Pokud byste chybu příště raději odhalili už při "
    echo "commitu, zkopírujte si pre-commit hook z _git_hooks do .git/hooks."
    echo
fi

rm -rf ${TMPDIR}
rm -f ${TMPDIFF}

exit $status