feat: generate actual json in `encode function

BREAKING_CHANGE:
`encode_geojson` function was generating `dynamic.Dynamic` which is pretty useless from consumer standpoint. Now it is refactored to generate `Json` type which can be stringified with `json.to_string`.

Note: currently intentionally left encoding arbitrary `Feature` properties unimplemented.

Signed-off-by: Aleksei Gurianov <gurianov@gmail.com>

Author: Guria

README.md

@@ -34,16 +34,27 @@ pub fn main() {
   case result {
     Ok(geojson) -> {
       // Successfully decoded GeoJSON
-      let encoded = gleojson.encode_geojson(geojson)
-      // encoded is now a Dynamic representation of the GeoJSON object
-      // You can use it for further processing or encoding back to JSON
     }
     Error(errors) -> {
       todo
       // Handle decoding errors
       // errors contains information about what went wrong during decoding
     }
   }
+
+  // Construct GeoJSON from types
+  let geojson = gleojson.GeoJSONFeatureCollection(
+    gleojson.FeatureCollection([
+      gleojson.Feature(
+        geometry: option.Some(gleojson.Point([1.0, 2.0])),
+        properties: option.None,
+        id: option.Some(gleojson.StringId("feature-id")),
+      ),
+    ]),
+  )
+
+  // Encode to JSON string
+  gleojson.encode_geojson(geojson) |> json.to_string
 }
 ```
 

birdie_snapshots/feature_encode_decode.accepted

@@ -0,0 +1,5 @@
+---
+version: 1.2.3
+title: feature_encode_decode
+---
+{"id":"feature-id","type":"Feature","geometry":{"type":"Point","coordinates":[1.0,2.0]},"properties":null}

birdie_snapshots/featurecollection_encode_decode.accepted

@@ -0,0 +1,5 @@
+---
+version: 1.2.3
+title: featurecollection_encode_decode
+---
+{"type":"FeatureCollection","features":[{"id":"feature-id","type":"Feature","geometry":{"type":"Point","coordinates":[1.0,2.0]},"properties":null}]}

birdie_snapshots/geometrycollection_encode_decode.accepted

@@ -0,0 +1,5 @@
+---
+version: 1.2.3
+title: geometrycollection_encode_decode
+---
+{"type":"GeometryCollection","geometries":[{"type":"Point","coordinates":[1.0,2.0]},{"type":"LineString","coordinates":[[3.0,4.0],[5.0,6.0]]}]}

birdie_snapshots/linestring_encode_decode.accepted

@@ -0,0 +1,5 @@
+---
+version: 1.2.3
+title: linestring_encode_decode
+---
+{"type":"LineString","coordinates":[[1.0,2.0],[3.0,4.0]]}

birdie_snapshots/multipoint_encode_decode.accepted

@@ -0,0 +1,5 @@
+---
+version: 1.2.3
+title: multipoint_encode_decode
+---
+{"type":"MultiPoint","coordinates":[[1.0,2.0],[3.0,4.0]]}

birdie_snapshots/multipolygon_encode_decode.accepted

@@ -0,0 +1,5 @@
+---
+version: 1.2.3
+title: multipolygon_encode_decode
+---
+{"type":"MultiPolygon","coordinates":[[[[1.0,2.0],[3.0,4.0],[5.0,6.0],[1.0,2.0]]],[[[7.0,8.0],[9.0,10.0],[11.0,12.0],[7.0,8.0]]]]}

birdie_snapshots/point_encode_decode.accepted

@@ -0,0 +1,5 @@
+---
+version: 1.2.3
+title: point_encode_decode
+---
+{"type":"Point","coordinates":[1.0,2.0]}

birdie_snapshots/polygon_encode_decode.accepted

@@ -0,0 +1,5 @@
+---
+version: 1.2.3
+title: polygon_encode_decode
+---
+{"type":"Polygon","coordinates":[[[1.0,2.0],[3.0,4.0],[5.0,6.0],[1.0,2.0]]]}

gleam.toml

@@ -8,7 +8,8 @@ links = [{ title = "RFC7946", href = "https://datatracker.ietf.org/doc/html/rfc7
 
 [dependencies]
 gleam_stdlib = ">= 0.34.0 and < 2.0.0"
+gleam_json = ">= 2.0.0 and < 3.0.0"
 
 [dev-dependencies]
 gleeunit = ">= 1.0.0 and < 2.0.0"
-gleam_json = ">= 2.0.0 and < 3.0.0"
+birdie = ">= 1.2.3 and < 2.0.0"