Add option for skipping fields

src/generate.rs

@@ -151,6 +151,8 @@ pub fn implement(field: &Field, params: &GenParams) -> TokenStream2 {
 
     let visibility = parse_visibility(attr.as_ref(), params.mode.name());
     match attr {
+        // Generate nothing for skipped field.
+        Some(meta) if meta.path().is_ident("skip") => quote! {},
         Some(_) => match params.mode {
             GenMode::Get => {
                 quote! {

src/lib.rs

@@ -242,12 +242,13 @@ fn parse_attr(attr: &syn::Attribute, mode: GenMode) -> Option<Meta> {
                 if !(meta.path().is_ident("get")
                     || meta.path().is_ident("get_copy")
                     || meta.path().is_ident("get_mut")
-                    || meta.path().is_ident("set"))
+                    || meta.path().is_ident("set")
+                    || meta.path().is_ident("skip"))
                 {
                     abort!(meta.path().span(), "unknown setter or getter")
                 }
             })
-            .filter(|meta| meta.path().is_ident(mode.name()))
+            .filter(|meta| meta.path().is_ident(mode.name()) || meta.path().is_ident("skip"))
             .last()
     } else {
         attr.parse_meta()

tests/skip.rs

@@ -0,0 +1,34 @@
+#[macro_use]
+extern crate getset;
+
+#[derive(CopyGetters)]
+#[get_copy]
+pub struct Plain {
+    /// A doc comment.
+    #[getset(skip)]
+    non_copyable: String,
+
+    copyable: usize,
+}
+
+impl Plain {
+    fn custom_non_copyable(&self) -> &str {
+        &self.non_copyable
+    }
+}
+
+impl Default for Plain {
+    fn default() -> Self {
+        Plain {
+            non_copyable: "foo".to_string(),
+            copyable: 3,
+        }
+    }
+}
+
+#[test]
+fn test_plain() {
+    let val = Plain::default();
+    val.copyable();
+    val.custom_non_copyable();
+}