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Fix up Windows verbatim paths when used with include! macro #23

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merged 1 commit into from
Feb 17, 2025
Merged

Fix up Windows verbatim paths when used with include! macro #23

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15 changes: 13 additions & 2 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -73,7 +73,7 @@ use proc_macro2::TokenStream;
use quote::{quote, ToTokens};
use std::env;
use std::fs;
use std::path::Path;
use std::path::{Component, Path, PathBuf};
use syn::parse::{Error, Parse, ParseBuffer, ParseStream, Parser, Result};
use syn::punctuated::Punctuated;
use syn::token::{Brace, Bracket, Paren};
Expand Down Expand Up @@ -150,14 +150,25 @@ impl Expr {
}

fn fs_read(span: &dyn ToTokens, path: impl AsRef<Path>) -> Result<String> {
let path = path.as_ref();
let mut path = path.as_ref();
if path.is_relative() {
let name = span.to_token_stream().into_iter().next().unwrap();
return Err(Error::new_spanned(
span,
format!("a relative path is not supported here; use `{name}!(concat!(env!(\"CARGO_MANIFEST_DIR\"), ...))`"),
));
}

// Make Windows verbatim paths work even with mixed path separators, which
// can happen when a path is produced using `concat!`.
let path_buf: PathBuf;
if let Some(Component::Prefix(prefix)) = path.components().next() {
if prefix.kind().is_verbatim() {
path_buf = path.components().collect();
path = &path_buf;
}
}

match fs::read_to_string(path) {
Ok(content) => Ok(content),
Err(err) => Err(Error::new_spanned(
Expand Down