handle relative paths when using Ignore programmatically (#599)

crates/ignore-files/Cargo.toml

@@ -20,11 +20,12 @@ gix-config = "0.22.0"
 ignore = "0.4.18"
 miette = "5.3.0"
 thiserror = "1.0.31"
-tokio = { version = "1.24.2", default-features = false, features = ["fs"] }
+tokio = { version = "1.24.2", default-features = false, features = ["fs", "macros", "rt"] }
 tracing = "0.1.35"
 radix_trie = "0.2.1"
 dunce = "1.0.4"
 
+
 [dependencies.project-origins]
 version = "1.2.0"
 path = "../project-origins"

crates/ignore-files/src/error.rs

@@ -37,4 +37,15 @@ pub enum Error {
 	#[error("multiple: {0:?}")]
 	#[diagnostic(code(ignore_file::set))]
 	Multi(#[related] Vec<Error>),
+
+	/// Error received when trying to canonicalize a path
+	#[error("cannot canonicalize '{path:?}'")]
+	Canonicalize {
+		/// the path that cannot be canonicalized
+		path: PathBuf,
+
+		/// the underlying error
+		#[source]
+		err: std::io::Error,
+	},
 }

crates/ignore-files/src/filter.rs

@@ -6,7 +6,7 @@ use ignore::{
 	Match,
 };
 use radix_trie::{Trie, TrieCommon};
-use tokio::fs::read_to_string;
+use tokio::fs::{canonicalize, read_to_string};
 use tracing::{trace, trace_span};
 
 use crate::{Error, IgnoreFile};
@@ -55,7 +55,12 @@ impl IgnoreFilter {
 	/// Use [`empty()`](IgnoreFilter::empty()) if you want an empty filterer,
 	/// or to construct one outside an async environment.
 	pub async fn new(origin: impl AsRef<Path> + Send, files: &[IgnoreFile]) -> Result<Self, Error> {
-		let origin = dunce::simplified(origin.as_ref());
+		let origin = origin.as_ref().to_owned();
+		let origin = canonicalize(&origin)
+			.await
+			.map_err(move |err| Error::Canonicalize { path: origin, err })?;
+
+		let origin = dunce::simplified(&origin);
 		let _span = trace_span!("build_filterer", ?origin);
 
 		trace!(files=%files.len(), "loading file contents");
@@ -368,3 +373,14 @@ fn prefix<T: AsRef<Path>>(path: T) -> String {
 		_ => "/".into(),
 	}
 }
+
+#[cfg(test)]
+mod tests {
+	use super::IgnoreFilter;
+
+	#[tokio::test]
+	async fn handle_relative_paths() {
+		let ignore = IgnoreFilter::new(".", &[]).await.unwrap();
+		assert!(ignore.origin.is_absolute());
+	}
+}