update list handler to use model.Name

types/model/name.go

@@ -35,6 +35,12 @@ func Unqualified(n Name) error {
 // spot in logs.
 const MissingPart = "!MISSING!"
 
+const (
+	defaultHost      = "registry.ollama.ai"
+	defaultNamespace = "library"
+	defaultTag       = "latest"
+)
+
 // DefaultName returns a name with the default values for the host, namespace,
 // and tag parts. The model and digest parts are empty.
 //
@@ -43,9 +49,9 @@ const MissingPart = "!MISSING!"
 //   - The default tag is ("latest")
 func DefaultName() Name {
 	return Name{
-		Host:      "registry.ollama.ai",
-		Namespace: "library",
-		Tag:       "latest",
+		Host:      defaultHost,
+		Namespace: defaultNamespace,
+		Tag:       defaultTag,
 	}
 }
 
@@ -169,6 +175,27 @@ func ParseNameBare(s string) Name {
 	return n
 }
 
+// ParseNameFromFilepath parses a 4-part filepath as a Name. The parts are
+// expected to be in the form:
+//
+// { host } "/" { namespace } "/" { model } "/" { tag }
+func ParseNameFromFilepath(s string) (n Name) {
+	parts := strings.Split(s, string(filepath.Separator))
+	if len(parts) != 4 {
+		return Name{}
+	}
+
+	n.Host = parts[0]
+	n.Namespace = parts[1]
+	n.Model = parts[2]
+	n.Tag = parts[3]
+	if !n.IsFullyQualified() {
+		return Name{}
+	}
+
+	return n
+}
+
 // Merge merges the host, namespace, and tag parts of the two names,
 // preferring the non-empty parts of a.
 func Merge(a, b Name) Name {
@@ -203,6 +230,27 @@ func (n Name) String() string {
 	return b.String()
 }
 
+// DisplayShort returns a short string version of the name.
+func (n Name) DisplayShortest() string {
+	var sb strings.Builder
+
+	if n.Host != defaultHost {
+		sb.WriteString(n.Host)
+		sb.WriteByte('/')
+		sb.WriteString(n.Namespace)
+		sb.WriteByte('/')
+	} else if n.Namespace != defaultNamespace {
+		sb.WriteString(n.Namespace)
+		sb.WriteByte('/')
+	}
+
+	// always include model and tag
+	sb.WriteString(n.Model)
+	sb.WriteString(":")
+	sb.WriteString(n.Tag)
+	return sb.String()
+}
+
 // IsValid reports whether all parts of the name are present and valid. The
 // digest is a special case, and is checked for validity only if present.
 func (n Name) IsValid() bool {