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//! [![github]](https://github.com/dtolnay/automod) [![crates-io]](https://crates.io/crates/automod) [![docs-rs]](https://docs.rs/automod) //! //! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github //! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust //! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logoColor=white&logo=data:image/svg+xml;base64,PHN2ZyByb2xlPSJpbWciIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgdmlld0JveD0iMCAwIDUxMiA1MTIiPjxwYXRoIGZpbGw9IiNmNWY1ZjUiIGQ9Ik00ODguNiAyNTAuMkwzOTIgMjE0VjEwNS41YzAtMTUtOS4zLTI4LjQtMjMuNC0zMy43bC0xMDAtMzcuNWMtOC4xLTMuMS0xNy4xLTMuMS0yNS4zIDBsLTEwMCAzNy41Yy0xNC4xIDUuMy0yMy40IDE4LjctMjMuNCAzMy43VjIxNGwtOTYuNiAzNi4yQzkuMyAyNTUuNSAwIDI2OC45IDAgMjgzLjlWMzk0YzAgMTMuNiA3LjcgMjYuMSAxOS45IDMyLjJsMTAwIDUwYzEwLjEgNS4xIDIyLjEgNS4xIDMyLjIgMGwxMDMuOS01MiAxMDMuOSA1MmMxMC4xIDUuMSAyMi4xIDUuMSAzMi4yIDBsMTAwLTUwYzEyLjItNi4xIDE5LjktMTguNiAxOS45LTMyLjJWMjgzLjljMC0xNS05LjMtMjguNC0yMy40LTMzLjd6TTM1OCAyMTQuOGwtODUgMzEuOXYtNjguMmw4NS0zN3Y3My4zek0xNTQgMTA0LjFsMTAyLTM4LjIgMTAyIDM4LjJ2LjZsLTEwMiA0MS40LTEwMi00MS40di0uNnptODQgMjkxLjFsLTg1IDQyLjV2LTc5LjFsODUtMzguOHY3NS40em0wLTExMmwtMTAyIDQxLjQtMTAyLTQxLjR2LS42bDEwMi0zOC4yIDEwMiAzOC4ydi42em0yNDAgMTEybC04NSA0Mi41di03OS4xbDg1LTM4Ljh2NzUuNHptMC0xMTJsLTEwMiA0MS40LTEwMi00MS40di0uNmwxMDItMzguMiAxMDIgMzguMnYuNnoiPjwvcGF0aD48L3N2Zz4K //! //! <br> //! //! **Pull in every source file in a directory as a module.** //! //! # Syntax //! //! ``` //! # const IGNORE: &str = stringify! { //! automod::dir!("path/to/directory"); //! # }; //! ``` //! //! This macro expands to one or more `mod` items, one for each source file in //! the specified directory. //! //! The path is given relative to the directory containing Cargo.toml. //! //! It is an error if the given directory contains no source files. //! //! # Example //! //! Suppose that we would like to keep a directory of regression tests for //! individual numbered issues: //! //! - tests/ //! - regression/ //! - issue1.rs //! - issue2.rs //! - ... //! - issue128.rs //! //! We would like to be able to toss files in this directory and have them //! automatically tested, without listing them in some explicit list of modules. //! Automod solves this by adding *tests/regression/mod.rs* containing: //! //! ``` //! # const IGNORE: &str = stringify! { //! automod::dir!("tests/regression"); //! # }; //! ``` //! //! The invocation expands to: //! //! ``` //! # const IGNORE: &str = stringify! { //! mod issue1; //! mod issue2; //! /* ... */ //! mod issue128; //! # }; //! ``` extern crate proc_macro; mod error; use proc_macro::TokenStream; use proc_macro2::{Ident, Span, TokenStream as TokenStream2}; use quote::quote; use syn::{parse_macro_input, LitStr}; use std::ffi::OsStr; use std::fs; use std::path::Path; use crate::error::{Error, Result}; #[proc_macro] pub fn dir(input: TokenStream) -> TokenStream { let input = parse_macro_input!(input as LitStr); let path = input.value(); let expanded = match source_file_names(path) { Ok(names) => names.into_iter().map(mod_item).collect(), Err(err) => syn::Error::new(Span::call_site(), err).to_compile_error(), }; TokenStream::from(expanded) } fn mod_item(name: String) -> TokenStream2 { let ident = Ident::new(&name, Span::call_site()); quote! { mod #ident; } } fn source_file_names<P: AsRef<Path>>(dir: P) -> Result<Vec<String>> { let mut names = Vec::new(); let mut failures = Vec::new(); for entry in fs::read_dir(dir)? { let entry = entry?; if !entry.file_type()?.is_file() { continue; } let file_name = entry.file_name(); if file_name == "mod.rs" || file_name == "lib.rs" || file_name == "main.rs" { continue; } let path = Path::new(&file_name); if path.extension() == Some(OsStr::new("rs")) { match file_name.into_string() { Ok(mut utf8) => { utf8.truncate(utf8.len() - ".rs".len()); names.push(utf8); } Err(non_utf8) => { failures.push(non_utf8); } } } } failures.sort(); if let Some(failure) = failures.into_iter().next() { return Err(Error::Utf8(failure)); } if names.is_empty() { return Err(Error::Empty); } names.sort(); Ok(names) }