Allow linking to lower level in delta specs.

Author: fantasai

bikeshed/metadata.py

@@ -60,6 +60,7 @@ def __init__(self):
         self.defaultHighlight = None
         self.defaultBiblioDisplay = "index"
         self.defaultRefStatus = None
+        self.deltaSpec = False
         self.displayShortname = None
         self.editors = []
         self.editorTerm = {"singular": "Editor", "plural": "Editors"}
@@ -1320,6 +1321,7 @@ def parseLiteralList(key, val, lineNum):  # pylint: disable=unused-argument
     "Default Ref Status": Metadata(
         "Default Ref Status", "defaultRefStatus", joinValue, parseRefStatus
     ),
+    "Delta Spec": Metadata("Delta Spec", "deltaSpec", joinValue, parseBoolean),
     "ED": Metadata("ED", "ED", joinValue, parseLiteral),
     "Editor": Metadata("Editor", "editors", joinList, parseEditor),
     "Editor Term": Metadata("Editor Term", "editorTerm", joinValue, parseEditorTerm),

bikeshed/refs/ReferenceManager.py

@@ -31,6 +31,7 @@ class ReferenceManager:
         "foreignRefs",
         "shortname",
         "specLevel",
+        "isDelta",
         "spec",
         "testing",
     ]
@@ -236,6 +237,7 @@ def setSpecData(self, md):
         self.shortname = md.shortname
         self.specLevel = md.level
         self.spec = md.vshortname
+        self.isDelta = md.deltaSpec
 
         for term, defaults in md.linkDefaults.items():
             for default in defaults:
@@ -506,6 +508,7 @@ def getRef(
             export = True
         else:
             export = None
+
         refs, failure = self.foreignRefs.queryRefs(
             text=text,
             linkType=linkType,
@@ -519,6 +522,21 @@ def getRef(
             ignoreObsoletes=True,
         )
 
+        if failure and self.isDelta:
+            refs, failure = self.foreignRefs.queryRefs(
+                text=text,
+                linkType=linkType,
+                spec=self.shortname,
+                status=status,
+                statusHint=statusHint,
+                linkFor=linkFor,
+                linkForHint=linkForHint,
+                explicitFor=explicitFor,
+                export=False,
+                ignoreObsoletes=True,
+                latestOnly=False,
+            )
+
         if (
             failure
             and linkType in ("argument", "idl")