Exclude skipped fields/variants from json schema

schemars/tests/expected/skip_enum_variants.json

@@ -0,0 +1,23 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "MyEnum",
+  "anyOf": [
+    {
+      "enum": [
+        "Included2"
+      ]
+    },
+    {
+      "type": "object",
+      "properties": {
+        "Included1": {
+          "type": "number",
+          "format": "float"
+        }
+      },
+      "required": [
+        "Included1"
+      ]
+    }
+  ]
+}

schemars/tests/expected/skip_struct_fields.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "MyStruct",
+  "type": "object",
+  "properties": {
+    "included1": {
+      "type": "number",
+      "format": "float"
+    },
+    "included2": {
+      "type": "null"
+    }
+  },
+  "required": [
+    "included1",
+    "included2"
+  ]
+}

schemars/tests/expected/skip_tuple_fields.json

@@ -0,0 +1,16 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "TupleStruct",
+  "type": "array",
+  "items": [
+    {
+      "type": "number",
+      "format": "float"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "maxItems": 2,
+  "minItems": 2
+}

schemars/tests/skip.rs

@@ -0,0 +1,58 @@
+mod util;
+use schemars::JsonSchema;
+use util::*;
+
+#[derive(Debug, JsonSchema)]
+struct MyStruct {
+    #[schemars(skip)]
+    skipped1: i32,
+    #[serde(skip)]
+    skipped2: bool,
+    #[serde(skip_deserializing)]
+    skipped3: String,
+    #[serde(skip_serializing)]
+    included1: f32,
+    included2: (),
+}
+
+#[test]
+fn skip_struct_fields() -> TestResult {
+    test_default_generated_schema::<MyStruct>("skip_struct_fields")
+}
+
+#[derive(Debug, JsonSchema)]
+struct TupleStruct (
+    #[schemars(skip)]
+    i32,
+    #[serde(skip)]
+    bool,
+    #[serde(skip_deserializing)]
+    String,
+    #[serde(skip_serializing)]
+    f32,
+    (),
+);
+
+#[test]
+fn skip_tuple_fields() -> TestResult {
+    test_default_generated_schema::<TupleStruct>("skip_tuple_fields")
+}
+
+#[derive(Debug, JsonSchema)]
+pub enum MyEnum {
+    #[schemars(skip)]
+    Skipped1(i32),
+    #[serde(skip)]
+    Skipped2,
+    #[serde(skip_deserializing)]
+    Skipped3,
+    #[serde(skip_serializing)]
+    Included1(f32),
+    Included2,
+}
+
+#[test]
+fn skip_enum_variants() -> TestResult {
+    test_default_generated_schema::<MyEnum>("skip_enum_variants")
+}
+