Merge pull request #163 from Wicpar/main

Compile time scss macro

rsass-macro/.gitignore

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+### Rust template
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+

rsass-macro/Cargo.toml

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+[package]
+name = "rsass-macro"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+syn = { version = "1.0.106", features = ["full", "extra-traits"] }
+quote = "1.0.22"
+proc-macro2 = "1.0.32"
+rsass = { path = ".." }

rsass-macro/src/lib.rs

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+extern crate proc_macro;
+use proc_macro::TokenStream;
+use proc_macro2::Span;
+use quote::ToTokens;
+use syn::{Error, LitStr, parse_macro_input};
+use rsass::output::{Format, Style};
+
+#[proc_macro]
+pub fn scss(tokens: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(tokens as LitStr);
+    let format = Format {
+        style: Style::Compressed,
+        precision: 10,
+    };
+    match rsass::compile_scss(input.value().as_bytes(), format) {
+        Ok(output) => {
+            let output = core::str::from_utf8(&output).unwrap();
+            LitStr::new(output, Span::call_site())
+                .to_token_stream()
+                .into()
+        }
+        Err(err) => {
+            let msg = format!("{err:?}");
+            Error::new(Span::call_site(), msg)
+                .into_compile_error()
+                .into()
+        }
+    }
+}

rsass-macro/tests/test_macro.rs

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+
+#[test]
+fn test_macro() {
+    const CSS: &'static str = rsass_macro::scss!(r#"
+        .class {
+            background: red;
+            &:hover {
+                background: blue;
+            }
+        }
+    "#);
+    assert_eq!(".class{background:red}.class:hover{background:blue}\n", CSS)
+}