gw-basic-2026/docs/development.md

# Development

## Development History

| Version | Commit | Description |
|---------|--------|-------------|
| 0.1.0 | `d8e8375` | Expression calculator with direct mode |
| 0.2.0 | `6162595` | Variables, arrays, program storage, control flow |
| 0.3.0 | `c2d73e9` | File I/O, PRINT USING, SAVE/LOAD, MID$ assignment, graphics stubs |
| 0.4.0 | `df5c308` | CHAIN, RUN "file", random-access I/O (FIELD/PUT/GET), CVI/CVS/CVD/MKI$/MKS$/MKD$ |
| 0.5.0 | `ad21350` | Full-screen TUI editor, KEY statement, Ctrl+Break, Sixel graphics, SOUND/BEEP/PLAY, DOSBox-X compat testing, project rename |
| 0.6.0 | `ece018d` | DATE$/TIME$/TIMER, FILES, SHELL, CHDIR, MKDIR, RMDIR |
| 0.7.0 | `da6b513` | AUTO, RENUM (with GOTO/GOSUB patching), DELETE, COMMON, LIST range fix |
| 0.8.0 | `c68167c` | Dynamic TUI screen buffer, `--full` flag, LPRINT/LLIST with `--lpt` |
| 0.9.0 | | EDIT statement, ON TIMER/ON KEY event trapping, F-key escape parser fixes |

## Tests

56 test programs in `tests/programs/`. Run the full suite:

```bash
bash tests/run_tests.sh
```

Each test has a 5-second timeout. When `.expected` files are present
(generated from real GWBASIC.EXE), the runner also reports compatibility
match status.

### Compatibility Testing

Compare output against real GWBASIC.EXE running under DOSBox-X:

```bash
# Generate .expected files from GWBASIC.EXE (requires DOSBox-X Flatpak)
bash tests/run_compat.sh --generate

# Compare gwbasic output against .expected
bash tests/run_compat.sh
```

## CI

GitHub Actions runs on every push to `main` and on pull requests. The workflow
builds the project with PulseAudio support and runs all 56 test programs.

See [`.github/workflows/ci.yml`](https://github.com/evvaletov/gw-basic-2026/blob/main/.github/workflows/ci.yml).