Initial stab at macros 1.1

.gitignore

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+target
+Cargo.lock

Cargo.toml

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+[workspace]
+members = ["askama", "askama_codegen", "askama_test"]

askama/Cargo.toml

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+[package]
+name = "askama"
+version = "0.1.0"
+authors = ["Dirkjan Ochtman <dirkjan@ochtman.nl>"]
+workspace = ".."
+
+[dependencies]
+askama_codegen = { path = "../askama_codegen" }

askama/src/lib.rs

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+#![feature(proc_macro)]
+
+#[macro_use]
+extern crate askama_codegen;
+
+pub trait Template {
+    fn render(&self) -> String;
+}
+
+#[cfg(test)]
+mod tests {
+
+    extern crate askama;
+
+    #[derive(Template)]
+    struct TestTemplate {
+        var: String,
+    }
+
+    #[test]
+    fn it_works() {
+        let s = TestTemplate { var: "foo".to_string() }.render();
+        assert_eq!(s, "hello world, foo");
+    }
+
+}

askama_codegen/Cargo.toml

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+[package]
+name = "askama_codegen"
+version = "0.1.0"
+authors = ["Dirkjan Ochtman <dirkjan@ochtman.nl>"]
+
+[dependencies]
+syn = "0.10"
+quote = "0.3"
+
+[lib]
+proc-macro = true

askama_codegen/src/lib.rs

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+#![feature(proc_macro, proc_macro_lib)]
+
+extern crate proc_macro;
+#[macro_use]
+extern crate quote;
+extern crate syn;
+
+use proc_macro::TokenStream;
+
+#[proc_macro_derive(Template, attributes(template))]
+pub fn derive_template(input: TokenStream) -> TokenStream {
+    let source = input.to_string();
+
+    let ast = syn::parse_macro_input(&source).unwrap();
+    let _ctx = match ast.body {
+        syn::Body::Struct(ref data) => data,
+        _ => panic!("#[derive(Template)] can only be used with structs"),
+    };
+
+    let name = &ast.ident;
+    let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
+    let expanded = quote! {
+        impl #impl_generics askama::Template for #name #ty_generics #where_clause {
+             fn render(&self) -> String {
+                 "hello world, bar".to_string()
+             }
+        }
+    };
+
+    expanded.parse().unwrap()
+}

askama_test/Cargo.toml

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+[package]
+name = "askama_test"
+version = "0.1.0"
+authors = ["Dirkjan Ochtman <dirkjan@ochtman.nl>"]
+workspace = ".."
+
+[dependencies]
+askama_codegen = { path = "../askama_codegen" }
+askama = { path = "../askama" }

askama_test/tests/simple.rs

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+#![feature(proc_macro)]
+
+#[macro_use]
+extern crate askama_codegen;
+extern crate askama;
+
+use askama::Template;
+
+#[derive(Template)]
+struct TestTemplate {
+    var: String,
+}
+
+#[test]
+fn it_works() {
+    let s = TestTemplate { var: "foo".to_string() }.render();
+    assert_eq!(s, "hello world, foo");
+}