# Music Hoard

## Code Coverage

### Pre-requisites

``` sh
rustup component add llvm-tools-preview
cargo install grcov
```

### Generating Code Coverage

```sh
env CARGO_TARGET_DIR=codecov \
    cargo clean
env RUSTFLAGS="-C instrument-coverage" \
    LLVM_PROFILE_FILE="codecov/debug/profraw/musichoard-%p-%m.profraw" \
    CARGO_TARGET_DIR=codecov \
    cargo test
grcov codecov/debug/profraw \
      --binary-path ./codecov/debug/ \
      --output-types html \
      --source-dir . \
      --ignore-not-existing \
      --ignore "tests/*" \
      --ignore "src/main.rs" \
      --excl-start "mod tests \{|GRCOV_EXCL_START" \
      --excl-stop "GRCOV_EXCL_STOP" \
      --output-path ./codecov/debug/coverage/
xdg-open codecov/debug/coverage/index.html
```

Note that some changes may not be visible until `codecov/debug/coverage` is removed and the `grcov`
command is rerun.

For most cases `cargo clean` can be replaced with `rm -rf ./codecov/debug/{coverage,profraw}`.