implement map-remove

src/builtin/map.rs

@@ -81,4 +81,19 @@ pub(crate) fn register(f: &mut HashMap<String, Builtin>) {
             Ok(Value::Map(map1))
         }),
     );
+    f.insert(
+        "map-remove".to_owned(),
+        Box::new(|mut args, _| {
+            let mut map = match arg!(args, 0, "map") {
+                Value::Map(m) => m,
+                Value::List(v, ..) if v.is_empty() => SassMap::new(),
+                v => return Err(format!("$map: {} is not a map.", v).into()),
+            };
+            let keys = args.get_variadic()?;
+            for key in keys {
+                map.remove(&key);
+            }
+            Ok(Value::Map(map))
+        }),
+    );
 }

tests/map.rs

@@ -119,3 +119,13 @@ error!(
     map_has_key_one_arg,
     "a {\n  color: map-has-key(1);\n}\n", "Error: Missing argument $key."
 );
+test!(
+    map_remove_one,
+    "a {\n  color: inspect(map-remove((\"foo\": 1, \"bar\": 2), \"bar\"));\n}\n",
+    "a {\n  color: (\"foo\": 1);\n}\n"
+);
+test!(
+    map_remove_two,
+    "a {\n  color: inspect(map-remove((\"foo\": 1, \"bar\": 2, \"baz\": 3), \"bar\", \"baz\"));\n}\n",
+    "a {\n  color: (\"foo\": 1);\n}\n"
+);