git-ref-format: add QualifiedPattern and NamespacedPattern

There was no mechanism for building refspec patterns that included
namespaces.

To get around this limitation, QualifiedPattern and NamespacedPattern
are added to the refspec module.

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett

git-ref-format/core/src/refspec/iter.rs

@@ -6,7 +6,7 @@
 use std::fmt::{self, Display};
 
 use super::PatternStr;
-use crate::RefStr;
+use crate::{lit, RefStr};
 
 pub type Iter<'a> = std::str::Split<'a, char>;
 
@@ -40,6 +40,13 @@ impl Display for Component<'_> {
     }
 }
 
+impl<T: lit::Lit> From<T> for Component<'static> {
+    #[inline]
+    fn from(_: T) -> Self {
+        Self::Normal(T::NAME)
+    }
+}
+
 #[must_use = "iterators are lazy and do nothing unless consumed"]
 #[derive(Clone)]
 pub struct Components<'a> {