hugolib: Add some more details to the "paginator not supported" error

See #11949

3 files changed, 10 insertions, 2 deletions

diff --git a/hugolib/page.go b/hugolib/page.go
index 822b7c021..10ecdcad2 100644
--- a/hugolib/page.go
+++ b/hugolib/page.go
@@ -553,6 +553,14 @@ func (p *pageState) wrapError(err error) error {
 	return p.m.wrapError(err, p.s.h.SourceFs)
 }
 
+func (p *pageState) getPageInfoForError() string {
+	s := fmt.Sprintf("kind: %q, path: %q", p.Kind(), p.Path())
+	if p.File() != nil {
+		s += fmt.Sprintf(", file: %q", p.File().Filename())
+	}
+	return s
+}
+
 func (p *pageState) getContentConverter() converter.Converter {
 	var err error
 	p.contentConverterInit.Do(func() {
diff --git a/hugolib/page__output.go b/hugolib/page__output.go
index 02956e87c..9050766d1 100644
--- a/hugolib/page__output.go
+++ b/hugolib/page__output.go
@@ -47,7 +47,7 @@ func newPageOutput(
 		paginatorProvider = pag
 	} else {
 		paginatorProvider = page.PaginatorNotSupportedFunc(func() error {
-			return fmt.Errorf("pagination not supported for pages of kind %q", ps.Kind())
+			return fmt.Errorf("pagination not supported for this page: %s", ps.getPageInfoForError())
 		})
 	}
 
diff --git a/hugolib/paginator_test.go b/hugolib/paginator_test.go
index 919f532ca..8075c0a5a 100644
--- a/hugolib/paginator_test.go
+++ b/hugolib/paginator_test.go
@@ -168,5 +168,5 @@ Paginator: {{ .Paginator }}
 `
 	b, err := TestE(t, files)
 	b.Assert(err, qt.IsNotNil)
-	b.Assert(err.Error(), qt.Contains, `error calling Paginator: pagination not supported for pages of kind "page"`)
+	b.Assert(err.Error(), qt.Contains, `error calling Paginator: pagination not supported for this page: kind: "page", path: "/p1", file: `+filepath.FromSlash(`"/content/p1.md"`))
 }