cue/ast/astutil: export ImportPathName

Change-Id: I232dea9a30d789c8eb577875bee8e3e255099a85
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/9461
Reviewed-by: CUE cueckoo <cueckoo@gmail.com>
Reviewed-by: Paul Jolly <paul@myitcv.org.uk>

cue/ast/astutil/apply.go

@@ -126,7 +126,7 @@ func (c *cursor) Import(importPath string) *ast.Ident {
 		return nil
 	}
 
-	name := importPathName(importPath)
+	name := ImportPathName(importPath)
 
 	// TODO: come up with something much better.
 	// For instance, hoist the uniquer form cue/export.go to

cue/ast/astutil/util.go

@@ -23,14 +23,14 @@ import (
 	"cuelang.org/go/cue/token"
 )
 
-// importPathName derives the name from the given import path.
+// ImportPathName derives the package name from the given import path.
 //
 // Examples:
 //      string           string
 //      foo.com/bar      bar
 //      foo.com/bar:baz  baz
 //
-func importPathName(id string) string {
+func ImportPathName(id string) string {
 	name := path.Base(id)
 	if p := strings.LastIndexByte(name, ':'); p > 0 {
 		name = name[p+1:]