Move info.toml to rustlings-macros/

This improves the experience for contributors on Windows becuase
Windows can't deal with git symbolic links out of the box…

CONTRIBUTING.md

@@ -37,7 +37,7 @@ Please be patient 😇
 - Name the file `exercises/yourTopic/yourTopicN.rs`.
 - Make sure to put in some helpful links, and link to sections of the book in `exercises/yourTopic/README.md`.
 - Add a (possible) solution at `solutions/yourTopic/yourTopicN.rs` with comments and links explaining it.
-- Add the [metadata for your exercise](#exercise-metadata) in the `info.toml` file.
+- Add the [metadata for your exercise](#exercise-metadata) in the `rustlings-macros/info.toml` file.
 - Make sure your exercise runs with `rustlings run yourTopicN`.
 - [Open a pull request](#pull-requests).
 

Cargo.toml

@@ -39,7 +39,6 @@ include = [
   "/src/",
   "/exercises/",
   "/solutions/",
-  "/info.toml",
   # A symlink to be able to include `dev/Cargo.toml` although `dev` is excluded.
   "/dev-Cargo.toml",
   "/README.md",

rustlings-macros/info.toml

@@ -1 +0,0 @@
-../info.toml

rustlings-macros/src/lib.rs

@@ -15,7 +15,8 @@ struct InfoFile {
 
 #[proc_macro]
 pub fn include_files(_: TokenStream) -> TokenStream {
-    let exercises = toml_edit::de::from_str::<InfoFile>(include_str!("../info.toml"))
+    let info_file = include_str!("../info.toml");
+    let exercises = toml_edit::de::from_str::<InfoFile>(info_file)
         .expect("Failed to parse `info.toml`")
         .exercises;
 
@@ -46,6 +47,7 @@ pub fn include_files(_: TokenStream) -> TokenStream {
 
     quote! {
         EmbeddedFiles {
+            info_file: #info_file,
             exercise_files: &[#(ExerciseFiles { exercise: include_bytes!(#exercise_files), solution: include_bytes!(#solution_files), dir_ind: #dir_inds }),*],
             exercise_dirs: &[#(ExerciseDir { name: #dirs, readme: include_bytes!(#readmes) }),*]
         }

src/embedded.rs

@@ -70,6 +70,7 @@ impl ExerciseDir {
 }
 
 pub struct EmbeddedFiles {
+    pub info_file: &'static str,
     exercise_files: &'static [ExerciseFiles],
     exercise_dirs: &'static [ExerciseDir],
 }
@@ -148,7 +149,7 @@ mod tests {
 
     #[test]
     fn dirs() {
-        let exercises = toml_edit::de::from_str::<InfoFile>(include_str!("../info.toml"))
+        let exercises = toml_edit::de::from_str::<InfoFile>(EMBEDDED_FILES.info_file)
             .expect("Failed to parse `info.toml`")
             .exercises;
 

src/info_file.rs

@@ -2,6 +2,8 @@ use anyhow::{bail, Context, Error, Result};
 use serde::Deserialize;
 use std::{fs, io::ErrorKind};
 
+use crate::embedded::EMBEDDED_FILES;
+
 // Deserialized from the `info.toml` file.
 #[derive(Deserialize)]
 pub struct ExerciseInfo {
@@ -47,7 +49,7 @@ impl InfoFile {
                 .context("Failed to parse the `info.toml` file")?,
             Err(e) => {
                 if e.kind() == ErrorKind::NotFound {
-                    return toml_edit::de::from_str(include_str!("../info.toml"))
+                    return toml_edit::de::from_str(EMBEDDED_FILES.info_file)
                         .context("Failed to parse the embedded `info.toml` file");
                 }