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Minimalist cross-platform audio editor inspired by Syntrillium Cool Edit

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# Cupuacu -- A minimalist cross-platform audio editor inspired by Syntrillium Cool Edit

Cupuacu started because I sometimes want to do simple things with audio files, like:

1. Open WAV
2. Trim/normalize/change gain
3. Save WAV

I'm not so keen on the workflow for this kind of task with Audacity, so I decided to take a stab at writing an audio editor myself.

Many years ago I used to work with Cool Edit, and it has many of the aspects that I would like to see in an audio editor. Chances are if you like Cool Edit, you might like where Cupuacu is going.

## Guides

- User manual: [`USER_MANUAL.md`](./USER_MANUAL.md)
- Developer guide: [`DEV.md`](./DEV.md)

## Name

I love fruit, especially uncommon, wild, tropical ones. Cupuacu, typically spelled "cupuaçu", is such a fruit, and I can recommend everyone to try it. For this project I was looking a name that is reminiscent of Cool Edit, and Cupuacu is a close enough match.

## Development setup

* CMake
* C++

That's it, really. Then you do something like this:

```sh
git clone https://github.com/izzyreal/cupuacu
cd cupuacu
cmake -B build
cmake --build build --target Cupuacu
./build/Cupuacu
```

That will default to the `make` build system on macOS and Linux, which is fine. But in reality I tend to use Ninja, because it gives you an easy way to switch between Debug and Release builds. So we get something like this (after installing Ninja on your system):

```sh
git clone https://github.com/izzyreal/cupuacu
cd cupuacu
cmake -G "Ninja Multi-Config" -B build
cmake --build build --config Debug --target Cupuacu
./build/Cupuacu
```

The `CMakeLists.txt` creates a nice little `compile_commands.json` in the root of the repo, making it play nice with `vim` and `YouCompleteMe`.

## Developer notes

There is now a separate developer-oriented guide in [`DEV.md`](./DEV.md).

It covers:

- codebase structure and architecture
- effect implementation patterns
- realtime preview design
- modal dialog behavior
- sanitizer targets (`RTSan` / `TSan`)
- SDL-backed test behavior and platform-specific test notes, especially on Windows

Typical local test commands:

```sh
cmake --build build-coverage-macos --target cupuacu-tests -j2
./build-coverage-macos/cupuacu-tests "[audio]"
./build-coverage-macos/cupuacu-tests "[actions]"
./build-coverage-macos/cupuacu-tests "[gui]"
./build-coverage-macos/cupuacu-tests "[file]"
```

Integration tests are intentionally separate from the unit suite. They are
meant to run only in a pinned Linux/Xvfb environment:

```sh
cmake -G Ninja -B build-integration-linux -DCUPUACU_BUILD_INTEGRATION_TESTS=ON
cmake --build build-integration-linux --target cupuacu-tests-integration -j2
DISPLAY=:99 SDL_VIDEODRIVER=x11 SDL_RENDER_DRIVER=software \
  ./build-integration-linux/cupuacu-tests-integration
```

There is also a helper script for the blessed Linux contract:

```sh
./scripts/run-integration-linux.sh
```

It reuses the existing `build-integration-linux` directory for incremental
builds. To force a fresh CMake configure, run:

```sh
CUPUACU_FORCE_CMAKE_CONFIGURE=1 ./scripts/run-integration-linux.sh
```

On macOS, you can run that same Linux contract locally through Podman:

```sh
podman machine start
./scripts/run-integration-podman.sh
```

For a clean joint unit+integration coverage run under that same Linux contract:

```sh
podman machine start
./scripts/run-joint-coverage-podman.sh
```

That writes:

- `dist/coverage.info`
- `dist/coverage-html/index.html`
- `dist/junit-unit.xml`
- `dist/junit-integration.xml`

Where supported, sanitizer targets are also available:

```sh
cmake --build build-coverage-macos --target cupuacu-tests-rtsan -j2
./build-coverage-macos/cupuacu-tests-rtsan
```

and:

```sh
cmake --build build-coverage-macos --target cupuacu-tests-tsan -j2
./build-coverage-macos/cupuacu-tests-tsan
```

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