src/Pure/Thy/bibtex.scala

   def is_bibtex(name: String): Boolean = name.endsWith(".bib")
 
   class File_Format extends isabelle.File_Format
   {
     val format_name: String = "bibtex"
-    val node_suffix: String = "bibtex_file"
-
-    def detect(name: String): Boolean = is_bibtex(name)
-
-    override def make_theory_name(
-      resources: Resources, name: Document.Node.Name): Option[Document.Node.Name] =
-    {
-      for { (_, ext_name) <- Thy_Header.split_file_name(name.node) if detect(ext_name) }
-      yield {
-        val thy_node = resources.append(name.node, Path.explode(node_suffix))
-        Document.Node.Name(thy_node, name.master_dir, ext_name)
-      }
-    }
-
-    override def make_theory_content(
-      resources: Resources, thy_name: Document.Node.Name): Option[String] =
-    {
-      for {
-        (prefix, suffix) <- Thy_Header.split_file_name(thy_name.node) if suffix == node_suffix
-        (_, ext_name) <- Thy_Header.split_file_name(prefix) if detect(ext_name)
-      } yield """theory "bib" imports Pure begin bibtex_file """ + quote(ext_name) + """ end"""
-    }
+    val file_ext: String = "bib"
+
+    override def theory_suffix: String = "bibtex_file"
+    override def theory_content(ext_name: String): String =
+      """theory "bib" imports Pure begin bibtex_file """ + quote(ext_name) + """ end"""
 
     override def make_preview(snapshot: Document.Snapshot): Option[Present.Preview] =
     {
       val name = snapshot.node_name
       if (detect(name.node)) {