introduce ReadOnlyVfs::singleton

create a VFS with exactly one file, handy for operations involving a
single buffer or file

1 files changed, 5 insertions, 0 deletions

diff --git a/vfs/src/lib.rs b/vfs/src/lib.rs
index 98bd1c3..8b5df79 100644
--- a/vfs/src/lib.rs
+++ b/vfs/src/lib.rs
@@ -36,6 +36,11 @@ pub struct ReadOnlyVfs {
 }
 
 impl ReadOnlyVfs {
+    pub fn singleton<P: AsRef<Path>>(path: P, contents: &[u8]) -> Self {
+        let mut vfs = ReadOnlyVfs::default();
+        vfs.set_file_contents(path, contents);
+        vfs
+    }
     pub fn alloc_file_id<P: AsRef<Path>>(&mut self, path: P) -> FileId {
         self.interner.intern(path.as_ref().to_owned())
     }