Allow overriding title/desc from doc comments (#13)

schemars_derive/src/ast/from_serde.rs

@@ -27,6 +27,8 @@ impl<'a> FromSerde for Container<'a> {
             data: Data::from_serde(errors, serde.data)?,
             generics: serde.generics,
             original: serde.original,
+            // FIXME this allows with/schema_with attribute on containers
+            attrs: Attrs::new(&serde.original.attrs, errors),
         })
     }
 }

schemars_derive/src/ast/mod.rs

@@ -11,6 +11,7 @@ pub struct Container<'a> {
     pub data: Data<'a>,
     pub generics: &'a syn::Generics,
     pub original: &'a syn::DeriveInput,
+    pub attrs: Attrs,
 }
 
 pub enum Data<'a> {

schemars_derive/src/attr/mod.rs

@@ -1,7 +1,6 @@
 mod doc;
 mod schemars_to_serde;
 
-pub use doc::get_title_and_desc_from_doc;
 pub use schemars_to_serde::process_serde_attrs;
 
 use proc_macro2::{Group, Span, TokenStream, TokenTree};
@@ -16,6 +15,7 @@ pub struct Attrs {
     pub with: Option<WithAttr>,
     pub title: Option<String>,
     pub description: Option<String>,
+    pub deprecated: bool,
     // TODO pub example: Option<syn::Path>,
 }
 
@@ -27,14 +27,17 @@ pub enum WithAttr {
 
 impl Attrs {
     pub fn new(attrs: &[syn::Attribute], errors: &Ctxt) -> Self {
-        let (title, description) = doc::get_title_and_desc_from_doc(attrs);
-        Attrs {
-            title,
-            description,
-            ..Attrs::default()
-        }
-        .populate(attrs, "schemars", false, errors)
-        .populate(attrs, "serde", true, errors)
+        let mut result = Attrs::default()
+            .populate(attrs, "schemars", false, errors)
+            .populate(attrs, "serde", true, errors);
+
+        result.deprecated = attrs.iter().any(|a| a.path.is_ident("deprecated"));
+
+        let (doc_title, doc_description) = doc::get_title_and_desc_from_doc(attrs);
+        result.title = result.title.or(doc_title);
+        result.description = result.description.or(doc_description);
+
+        result
     }
 
     fn populate(
@@ -90,6 +93,24 @@ impl Attrs {
                     }
                 }
 
+                Meta(NameValue(m)) if m.path.is_ident("title") => {
+                    if let Ok(title) = get_lit_str(errors, attr_type, "title", &m.lit) {
+                        match self.title {
+                            Some(_) => duplicate_error(m),
+                            None => self.title = Some(title.value()),
+                        }
+                    }
+                }
+
+                Meta(NameValue(m)) if m.path.is_ident("description") => {
+                    if let Ok(description) = get_lit_str(errors, attr_type, "description", &m.lit) {
+                        match self.description {
+                            Some(_) => duplicate_error(m),
+                            None => self.description = Some(description.value()),
+                        }
+                    }
+                }
+
                 Meta(_meta_item) => {
                     // TODO uncomment this for 0.8.0 (breaking change)
                     //  https://github.com/GREsau/schemars/issues/18

schemars_derive/src/metadata.rs

@@ -1,19 +1,19 @@
 use crate::attr;
+use attr::Attrs;
 use proc_macro2::{Ident, Span, TokenStream};
 use quote::{ToTokens, TokenStreamExt};
-use syn::Attribute;
 
 #[derive(Debug, Clone, Default)]
-pub struct SchemaMetadata {
-    pub title: Option<String>,
-    pub description: Option<String>,
+pub struct SchemaMetadata<'a> {
+    pub title: Option<&'a str>,
+    pub description: Option<&'a str>,
     pub deprecated: bool,
     pub read_only: bool,
     pub write_only: bool,
     pub default: Option<TokenStream>,
 }
 
-impl ToTokens for SchemaMetadata {
+impl ToTokens for SchemaMetadata<'_> {
     fn to_tokens(&self, tokens: &mut TokenStream) {
         let setters = self.make_setters();
         if setters.is_empty() {
@@ -30,14 +30,12 @@ impl ToTokens for SchemaMetadata {
     }
 }
 
-impl SchemaMetadata {
-    pub fn from_attrs(attrs: &[Attribute]) -> SchemaMetadata {
-        let (title, description) = attr::get_title_and_desc_from_doc(attrs);
-        let deprecated = attrs.iter().any(|a| a.path.is_ident("deprecated"));
+impl<'a> SchemaMetadata<'a> {
+    pub fn from_attrs(attrs: &'a Attrs) -> Self {
         SchemaMetadata {
-            title,
-            description,
-            deprecated,
+            title: attrs.title.as_deref().and_then(none_if_empty),
+            description: attrs.description.as_deref().and_then(none_if_empty),
+            deprecated: attrs.deprecated,
             ..Default::default()
         }
     }
@@ -51,7 +49,7 @@ impl SchemaMetadata {
         }
     }
 
-    fn make_setters(self: &SchemaMetadata) -> Vec<TokenStream> {
+    fn make_setters(&self) -> Vec<TokenStream> {
         let mut setters = Vec::<TokenStream>::new();
 
         if let Some(title) = &self.title {
@@ -91,3 +89,11 @@ impl SchemaMetadata {
         setters
     }
 }
+
+fn none_if_empty<'a>(s: &'a str) -> Option<&'a str> {
+    if s.is_empty() {
+        None
+    } else {
+        Some(s)
+    }
+}

schemars_derive/src/schema_exprs.rs

@@ -13,7 +13,7 @@ pub fn expr_for_container(cont: &Container) -> TokenStream {
         Data::Enum(variants) => expr_for_enum(variants, &cont.serde_attrs),
     };
 
-    let doc_metadata = SchemaMetadata::from_attrs(&cont.original.attrs);
+    let doc_metadata = SchemaMetadata::from_attrs(&cont.attrs);
     doc_metadata.apply_to_schema(schema_expr)
 }
 
@@ -121,7 +121,7 @@ fn expr_for_external_tagged_enum<'a>(
                 ..Default::default()
             })),
         });
-        let doc_metadata = SchemaMetadata::from_attrs(&variant.original.attrs);
+        let doc_metadata = SchemaMetadata::from_attrs(&variant.attrs);
         doc_metadata.apply_to_schema(schema_expr)
     }));
 
@@ -160,7 +160,7 @@ fn expr_for_internal_tagged_enum<'a>(
                 ..Default::default()
             })),
         });
-        let doc_metadata = SchemaMetadata::from_attrs(&variant.original.attrs);
+        let doc_metadata = SchemaMetadata::from_attrs(&variant.attrs);
         let tag_schema = doc_metadata.apply_to_schema(tag_schema);
 
         match expr_for_untagged_enum_variant_for_flatten(&variant) {
@@ -182,7 +182,7 @@ fn expr_for_internal_tagged_enum<'a>(
 fn expr_for_untagged_enum<'a>(variants: impl Iterator<Item = &'a Variant<'a>>) -> TokenStream {
     let schemas = variants.map(|variant| {
         let schema_expr = expr_for_untagged_enum_variant(variant);
-        let doc_metadata = SchemaMetadata::from_attrs(&variant.original.attrs);
+        let doc_metadata = SchemaMetadata::from_attrs(&variant.attrs);
         doc_metadata.apply_to_schema(schema_expr)
     });
 
@@ -240,7 +240,7 @@ fn expr_for_adjacent_tagged_enum<'a>(
             })),
         });
 
-        let doc_metadata = SchemaMetadata::from_attrs(&variant.original.attrs);
+        let doc_metadata = SchemaMetadata::from_attrs(&variant.attrs);
         doc_metadata.apply_to_schema(outer_schema)
     });
 
@@ -334,7 +334,7 @@ fn expr_for_struct(fields: &[Field], cattrs: Option<&serde_attr::Container>) ->
             read_only: field.serde_attrs.skip_deserializing(),
             write_only: field.serde_attrs.skip_serializing(),
             default,
-            ..SchemaMetadata::from_attrs(&field.original.attrs)
+            ..SchemaMetadata::from_attrs(&field.attrs)
         };
 
         let (ty, type_def) = type_for_schema(field, type_defs.len());