From 6dd096123d18dcae4c596def00edf9b778e6f01f Mon Sep 17 00:00:00 2001
From: Dirkjan Ochtman <dirkjan@ochtman.nl>
Date: Fri, 29 Apr 2022 18:01:35 +0200
Subject: [PATCH] Passing first test

---
 .gitignore                    |  2 ++
 Cargo.toml                    |  2 ++
 instant-xml-macros/Cargo.toml | 13 +++++++++++++
 instant-xml-macros/src/lib.rs | 22 ++++++++++++++++++++++
 instant-xml/Cargo.toml        | 10 ++++++++++
 instant-xml/src/lib.rs        | 27 +++++++++++++++++++++++++++
 instant-xml/tests/all.rs      |  9 +++++++++
 7 files changed, 85 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.toml
 create mode 100644 instant-xml-macros/Cargo.toml
 create mode 100644 instant-xml-macros/src/lib.rs
 create mode 100644 instant-xml/Cargo.toml
 create mode 100644 instant-xml/src/lib.rs
 create mode 100644 instant-xml/tests/all.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..96ef6c0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..0e49ca5
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,2 @@
+[workspace]
+members = ["instant-xml", "instant-xml-macros"]
diff --git a/instant-xml-macros/Cargo.toml b/instant-xml-macros/Cargo.toml
new file mode 100644
index 0000000..22a14c5
--- /dev/null
+++ b/instant-xml-macros/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "instant-xml-macros"
+version = "0.1.0"
+edition = "2021"
+workspace = ".."
+
+[lib]
+proc-macro = true
+
+[dependencies]
+heck = "0.4"
+quote = "1.0.18"
+syn = { version = "1.0.86", features = ["full"] }
diff --git a/instant-xml-macros/src/lib.rs b/instant-xml-macros/src/lib.rs
new file mode 100644
index 0000000..73c4c9b
--- /dev/null
+++ b/instant-xml-macros/src/lib.rs
@@ -0,0 +1,22 @@
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::parse_macro_input;
+
+#[proc_macro_derive(ToXml)]
+pub fn to_xml(input: TokenStream) -> TokenStream {
+    let ast = parse_macro_input!(input as syn::ItemStruct);
+    let ident = &ast.ident;
+    let name = ident.to_string();
+    TokenStream::from(quote!(
+        impl ToXml for #ident {
+            fn write_xml<W: ::std::fmt::Write>(&self, write: &mut W) -> Result<(), instant_xml::Error> {
+                write.write_str("<")?;
+                write.write_fmt(format_args!("{}", #name))?;
+                write.write_str("/>")?;
+                Ok(())
+            }
+        }
+    ))
+}
diff --git a/instant-xml/Cargo.toml b/instant-xml/Cargo.toml
new file mode 100644
index 0000000..20d3783
--- /dev/null
+++ b/instant-xml/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "instant-xml"
+version = "0.1.0"
+edition = "2021"
+workspace = ".."
+
+[dependencies]
+macros = { package = "instant-xml-macros", version = "0.1", path = "../instant-xml-macros" }
+thiserror = "1.0.29"
+xmlparser = "0.13.3"
diff --git a/instant-xml/src/lib.rs b/instant-xml/src/lib.rs
new file mode 100644
index 0000000..c6c5cbc
--- /dev/null
+++ b/instant-xml/src/lib.rs
@@ -0,0 +1,27 @@
+use std::fmt;
+
+use thiserror::Error;
+
+pub use macros::ToXml;
+
+pub trait ToXml {
+    fn write_xml<W: fmt::Write>(&self, write: &mut W) -> Result<(), Error>;
+
+    fn to_xml(&self) -> Result<String, Error> {
+        let mut out = String::new();
+        self.write_xml(&mut out)?;
+        Ok(out)
+    }
+}
+
+pub trait FromXml<'xml>: Sized {
+    fn from_xml(input: &str) -> Result<Self, Error>;
+}
+
+pub trait FromXmlOwned: for<'xml> FromXml<'xml> {}
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("format: {0}")]
+    Format(#[from] fmt::Error),
+}
diff --git a/instant-xml/tests/all.rs b/instant-xml/tests/all.rs
new file mode 100644
index 0000000..b347244
--- /dev/null
+++ b/instant-xml/tests/all.rs
@@ -0,0 +1,9 @@
+use instant_xml::ToXml;
+
+#[derive(ToXml)]
+struct Unit;
+
+#[test]
+fn unit() {
+    assert_eq!(Unit.to_xml().unwrap(), "<Unit/>");
+}