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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" {
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)
}