feat: add authors list to descirbe function in regtap

pyvo/registry/regtap.py

@@ -835,12 +835,19 @@ def describe(self, verbose=False, width=78, file=None):
                 file=file)
 
         if verbose:
-            if self.reference_url:
-                print("More info: " + self.reference_url, file=file)
+            if self.source_value:
+                print(f"\nSource: {self.source_value}", file=file)
+            if self.creators:
+                nmax_authors = 5
+                if len(self.creators) <= nmax_authors:
+                    print(f"Authors: {', '.join(self.creators)}", file=file)
+                else:
+                    print(f"Authors: {', '.join(self.creators[:nmax_authors])} et al.\n"
+                    "See creators attribute for the complete list of authors.", file=file)
             if self.alt_identifier:
                 print(f"Alternative identifier: {self.alt_identifier}", file=file)
-            if self.source_value:
-                print(f"Source: {self.source_value}", file=file)
+            if self.reference_url:
+                print("More info: " + self.reference_url, file=file)
 
     def get_contact(self):
         """

pyvo/registry/tests/test_regtap.py

@@ -726,8 +726,28 @@ def test_describe_multi(self, flash_service):
                 " ssa, tap#aux, web" in output)
         assert "Multi-capability service" in output
         assert "Source: 1996A&A...312..539S" in output
-        assert "More info: http://dc.zah" in output
+        assert "Authors: Wolf" in output
         assert "Alternative identifier: doi:10.21938/" in output
+        assert "More info: http://dc.zah" in output
+
+    def test_describe_long_authors_list(self):
+        # generate a registry record with minimum
+        # information for the describe method and
+        # a long list of authors
+        rsc = _makeRegistryRecord(
+            access_urls=[],
+            standard_ids=["ivo://pyvo/test"],
+            short_name=["name"],
+            intf_types=[],
+            intf_roles=[],
+            creator_seq=["a;" * 6],
+            res_title=["title"]
+        )
+        out = io.StringIO()
+        rsc.describe(verbose=True, file=out)
+        output = out.getvalue()
+        # output should cut at 5 authors
+        assert "Authors: a, a, a, a, a et al." in output
 
     def test_no_access_url(self):
         rsc = _makeRegistryRecord(