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Panic with better message if template attribute is not found (fixes #3)

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This commit is contained in:
Dirkjan Ochtman 2017-03-07 21:07:01 +01:00
parent 0eeb5d1b2d
commit d65d08b937
1 changed files with 8 additions and 1 deletions
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9
askama_derive/src/lib.rs
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@ -19,9 +19,16 @@ struct TemplateMeta {
// in the parsed struct or enum. Will panic if it does not find the required
// template path, or if the `print` key has an unexpected value.
fn get_template_meta(ast: &syn::DeriveInput) -> TemplateMeta {
let attr = ast.attrs.iter().find(|a| a.name() == "template");
if attr.is_none() {
let msg = format!("'template' attribute not found on struct '{}'",
ast.ident.as_ref());
panic!(msg);
}
let attr = attr.unwrap();
let mut path = None;
let mut print = "none".to_string();
let attr = ast.attrs.iter().find(|a| a.name() == "template").unwrap();
if let syn::MetaItem::List(_, ref inner) = attr.value {
for nm_item in inner {
if let syn::NestedMetaItem::MetaItem(ref item) = *nm_item {