sqlitegis 0.1.0

SQLiteGIS: PostGIS-style spatial functions for SQLite in pure Rust.
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# SQLiteGIS

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PostGIS-style spatial functions for SQLite in pure Rust. Ships as a SQLite loadable extension (native and WASM) and as a Diesel ORM integration. Geometries travel as EWKB BLOBs, matching the PostGIS wire format so queries port between SQLite and PostGIS without rewriting.

## SQLite extension

```sh
cargo build --release -p sqlitegis --features sqlite-extension
```

```sql
SELECT load_extension('./target/release/libsqlitegis');
SELECT ST_AsText(ST_Buffer(ST_Point(0, 0), 1.0));
SELECT ST_Distance(ST_GeomFromText('POINT(0 0)'), ST_GeomFromText('POINT(3 4)'));
```

## Pure-Rust geometry

```rust
use sqlitegis::core::functions::constructors::st_point;
use sqlitegis::core::functions::measurement::st_distance;

let a = st_point(0.0, 0.0, None).unwrap();
let b = st_point(3.0, 4.0, None).unwrap();
assert!((st_distance(&a, &b).unwrap() - 5.0).abs() < 1e-10);
```

## Diesel integration

```rust
# #[cfg(feature = "diesel-sqlite")]
# {
use diesel::prelude::*;
use sqlitegis::diesel::functions::st_point;
use sqlitegis::diesel::prelude::*;

diesel::table! {
    features (id) {
        id -> Integer,
        geom -> Nullable<sqlitegis::diesel::Geometry>,
    }
}

let _query = features::table
    .filter(features::geom.st_dwithin(st_point(13.4, 52.5).nullable(), 1000.0).eq(true))
    .select(features::geom.st_astext());
# }
```

`CreateSpatialIndex` and `DropSpatialIndex` are DDL helpers without typed wrappers, called through `diesel::sql_query`. R-tree-backed queries run 50 to 60x faster than the non-indexed equivalents (see Benchmarks).

## Notes

Geodesic functions (`ST_DistanceSphere`, `ST_DistanceSpheroid`, `ST_LengthSphere`, `ST_Azimuth`, `ST_Project`, `ST_DWithinSphere`, `ST_DWithinSpheroid`) require `SRID=4326` non-empty Point inputs and reject anything else. `ST_GeomFromGeoJSON` defaults to `SRID=4326`. `ST_DWithin*` predicates require a finite, non-negative distance.

## Benchmarks

Criterion central estimates on the included R-tree workloads:

| Scenario | Indexed | Non-indexed | Speedup |
| --- | ---: | ---: | ---: |
| `intersects_window` | `178 us` | `9.81 ms` | `~55x` |
| `knn` | `89 us` | `5.66 ms` | `~64x` |

## Contributing

See [CONTRIBUTING.md](CONTRIBUTING.md).

## License

MIT OR Apache-2.0