#!/bin/bash

die() { echo "ABORT: $*"; exit 1; }

TARGET=${CARGO_TARGET_DIR:-./target}

rm -r kcov >/dev/null 2>&1
mkdir kcov || die "Can't creat kcov/"

COUNT=10000
./run-feature-combinations | while read features; do
    echo "=== Features: $features"

    # Depending on the Rust version, test executables may be
    # dumped in $TARGET/debug or $TARGET/debug/deps
    rm -r $(find $TARGET/debug -name "pipebuf-*") >/dev/null 2>&1

    # Can't use --no-run because it excludes some of the tests.
    # Need "link-dead-code" to get all the source (including
    # source without coverage) to show up.  Need "opt-level=0" or
    # otherwise "link-dead-code" fails with linking problems.
    RUSTFLAGS="-C link-dead-code -C codegen-units=1 -C opt-level=0" \
             cargo test --no-default-features --features "$features" >kcov/test-$$ 2>&1 ||
        die "cargo test failed; see kcov/test-$$"
    rm kcov/test-$$

    # Expect two test binaries to be generated: one for the unit
    # tests, the other for the integration tests.  Requires that
    # integration tests be called pipebuf.rs
    set ""
    set $(find $TARGET/debug -name "pipebuf-*" -type f -executable)

    [ -z "$1" ] && die "Can't find first test binary in $TARGET/debug"
    [ -z "$2" ] && die "Can't find second test binary in $TARGET/debug"
    [ ! -z "$3" ] && die "Found more than two test binaries in $TARGET/debug"

    for EXE in "$@"
    do
        OUT=kcov/out-$$-${COUNT#1}
        let COUNT=COUNT+1
        mkdir $OUT

        kcov --verify \
             --include-pattern=pipebuf/src \
             $OUT $EXE ||
            die "kcov failed"
    done
done || exit 1

echo "=== MERGING reports to kcov/out/ ..."
mkdir kcov/out
kcov --merge kcov/out kcov/out-*

# Check that no files have been excluded
( find src -name "*.rs" |
      fgrep -v test |
      perl -pe 's|.*/||';
) | sort >kcov/list-source
ls kcov/out/kcov-merged/*.rs.*.html |
    perl -pe 's/\.rs.*/.rs/; s|.*/||;' |
    sort >kcov/list-covered
cmp kcov/list-source kcov/list-covered >/dev/null 2>&1 || {
    echo "WARNING: Some files not included in report:" $(comm -23 kcov/list-source kcov/list-covered)
}