Add basic glob function

crates/lb/Cargo.toml

@@ -9,11 +9,13 @@ repository.workspace = true
 
 [features]
 task = ["tokio/rt", "tokio/time"]
-fs = ["tokio/fs"]
+fs = ["tokio/fs", "dep:glob"]
 net = ["tokio/net"]
+glob = ["dep:glob"]
 
 [dependencies]
 derive_more = { version = "2.0.1", features = ["full"] }
+glob = { version = "0.3.2", optional = true }
 luaffi = { path = "../luaffi" }
 luajit = { path = "../luajit" }
 sysexits = "0.9.0"

crates/lb/src/fs.rs

@@ -26,6 +26,12 @@ pub enum Error {
     /// I/O error.
     #[error("{0}")]
     Io(#[from] std::io::Error),
+    /// Glob error.
+    #[error("{0}")]
+    Glob(#[from] glob::GlobError),
+    /// Glob pattern error.
+    #[error("{0}")]
+    GlobPattern(#[from] glob::PatternError),
 }
 
 type Result<T> = std::result::Result<T, Error>;
@@ -70,6 +76,10 @@ impl lb_fslib {
     pub extern "Lua-C" fn read_dir_sync(&self, path: &str) -> Result<lb_read_dir_sync> {
         Ok(std::fs::read_dir(path)?.into())
     }
+
+    pub extern "Lua-C" fn glob(&self, pattern: &str) -> Result<lb_glob_paths> {
+        Ok(glob::glob(pattern)?.into())
+    }
 }
 
 /// Iterator over the entries in a directory.
@@ -289,3 +299,20 @@ impl lb_file_perms {
         self.0.set_readonly(readonly);
     }
 }
+
+/// Iterator that yields paths from the filesystem that match a particular pattern.
+#[derive(Debug, From)]
+#[cdef]
+pub struct lb_glob_paths(#[opaque] glob::Paths);
+
+#[metatype]
+impl lb_glob_paths {
+    #[call]
+    pub extern "Lua-C" fn next(&mut self) -> Result<Option<String>> {
+        Ok(self
+            .0
+            .next()
+            .transpose()?
+            .map(|s| s.to_string_lossy().into()))
+    }
+}