Done macro

rustlings-macros/src/lib.rs

@@ -0,0 +1,95 @@
+use proc_macro::TokenStream;
+use quote::quote;
+use std::{fs::read_dir, panic, path::PathBuf};
+
+fn path_to_string(path: PathBuf) -> String {
+    path.into_os_string()
+        .into_string()
+        .unwrap_or_else(|original| {
+            panic!("The path {} is invalid UTF8", original.to_string_lossy());
+        })
+}
+
+#[proc_macro]
+pub fn include_files(_: TokenStream) -> TokenStream {
+    let mut files = Vec::with_capacity(8);
+    let mut dirs = Vec::with_capacity(128);
+
+    for entry in read_dir("exercises").expect("Failed to open the exercises directory") {
+        let entry = entry.expect("Failed to read the exercises directory");
+
+        if entry.file_type().unwrap().is_file() {
+            let path = entry.path();
+            if path.file_name().unwrap() != "README.md" {
+                files.push(path_to_string(path));
+            }
+
+            continue;
+        }
+
+        let dir_path = entry.path();
+        let dir_files = read_dir(&dir_path).unwrap_or_else(|e| {
+            panic!("Failed to open the directory {}: {e}", dir_path.display());
+        });
+        let dir_path = path_to_string(dir_path);
+        let dir_files = dir_files.filter_map(|entry| {
+            let entry = entry.unwrap_or_else(|e| {
+                panic!("Failed to read the directory {dir_path}: {e}");
+            });
+            let path = entry.path();
+
+            if !entry.file_type().unwrap().is_file() {
+                panic!("Found {} but expected only files", path.display());
+            }
+
+            if path.file_name().unwrap() == "README.md" {
+                return None;
+            }
+
+            if path.extension() != Some("rs".as_ref()) {
+                panic!(
+                    "Found {} but expected only README.md and .rs files",
+                    path.display(),
+                );
+            }
+
+            Some(path_to_string(path))
+        });
+
+        dirs.push(quote! {
+            EmbeddedFlatDir {
+                path: #dir_path,
+                readme: EmbeddedFile {
+                    path: concat!(#dir_path, "/README.md"),
+                    content: ::std::include_bytes!(concat!("../", #dir_path, "/README.md")),
+                },
+                content: vec![
+                    #(EmbeddedFile {
+                        path: #dir_files,
+                        content: ::std::include_bytes!(concat!("../", #dir_files)),
+                    }),*
+                ],
+            }
+        });
+    }
+
+    quote! {
+        EmbeddedFiles {
+            info_toml_content: ::std::include_str!("../info.toml"),
+            exercises_dir: ExercisesDir {
+                readme: EmbeddedFile {
+                    path: "exercises/README.md",
+                    content: ::std::include_bytes!("../exercises/README.md"),
+                },
+                files: vec![#(
+                     EmbeddedFile {
+                        path: #files,
+                        content: ::std::include_bytes!(concat!("../", #files)),
+                    }
+                ),*],
+                dirs: vec![#(#dirs),*],
+            },
+        }
+    }
+    .into()
+}