#!/bin/sh
set -e -u -x

# needs 'gcov' executable and gcovr script installed
# as well https://github.com/gcovr/gcovr

gcovr --version
jq --version
sed --version
mktemp --version

REV="${1:-HEAD}"

TDIR=`mktemp -d`
trap 'rm -rf "$TDIR"' EXIT INT QUIT TERM

git archive --format tar "$REV" | tar -C "$TDIR" -xv

if [ -f configure/RELEASE.local ]
then
    sed -e "s|\$(TOP)|${PWD}|g" configure/RELEASE.local > "$TDIR/configure"/RELEASE.local
else
    sed -e "s|\$(TOP)|${PWD}|g" configure/RELEASE > "$TDIR/configure"/RELEASE.local
fi

if [ -f configure/CONFIG_SITE.local ]
then
    sed -e 's|-Werror||g' configure/CONFIG_SITE.local > "$TDIR/configure"/CONFIG_SITE.local
fi

make -C "$TDIR" -j8 \
 CROSS_COMPILER_TARGET_ARCHS= \
 CMD_CXXFLAGS='-fprofile-arcs -ftest-coverage -O0' \
 CMD_LDFLAGS='-fprofile-arcs -ftest-coverage' \
 test

# run tests, which write .gcdc/gcno files
make -C "$TDIR" -j8 \
 CROSS_COMPILER_TARGET_ARCHS= \
 CMD_CXXFLAGS='-fprofile-arcs -ftest-coverage -O0' \
 CMD_LDFLAGS='-fprofile-arcs -ftest-coverage' \
 runtests

OUTDIR="$PWD"/coverage
install -d "$OUTDIR"

# pre-process for each directory, correcting "file" relative to repo root
for dir in src ioc
do
    ( cd "$TDIR"/$dir/O.linux-* \
    && gcovr --gcov-ignore-parse-errors -v -r .. --json \
    | jq '.files[].file |= "'${dir}'/" + .' ) \
    > "$TDIR"/${dir}.json
done

# aggregate and summarize
gcovr \
 --add-tracefile "$TDIR"/src.json \
 --add-tracefile "$TDIR"/ioc.json \
 --html --html-details -o "$OUTDIR"/coverage.html

cd "$OUTDIR"
tar -cavf coverage.tar.bz2 coverage*.html