fix(complete): Allow completing '.'

Author: epage

clap_complete/src/engine/custom.rs

@@ -259,6 +259,10 @@ pub(crate) fn complete_path(
     };
     debug!("complete_path: search_root={search_root:?}, prefix={prefix:?}");
 
+    if value_os.is_empty() && is_wanted(&search_root) {
+        completions.push(".".into());
+    }
+
     for entry in std::fs::read_dir(&search_root)
         .ok()
         .into_iter()

clap_complete/tests/testsuite/engine.rs

@@ -639,6 +639,7 @@ fn suggest_value_path_dir() {
     assert_data_eq!(
         complete!(cmd, "--input [TAB]", current_dir = Some(testdir_path)),
         snapbox::str![[r#"
+.
 c_dir/
 d_dir/
 "#]],