identify: change p1/p2 to a list of parents

It makes sense because the nested data structure is a list of items.

mercurial/commands.py

@@ -2790,12 +2790,12 b' def identify(ui, repo, source=None, rev='
                 numoutput = ["%d" % p.rev() for p in parents]
                 output.append("%s%s" % ('+'.join(numoutput), dirty))
 
-            for i, p in enumerate(parents):
-                fn = fm.nested('p%d' % (i + 1))
+            fn = fm.nested('parents')
+            for p in parents:
                 fn.startitem()
                 fn.data(rev=p.rev())
                 fn.data(node=p.hex())
-                fn.end()
+            fn.end()
         else:
             hexoutput = hexfunc(ctx.node())
             if default or id:

tests/test-identify.t

@@ -51,7 +51,7 b' with options'
     "dirty": "",
     "id": "cb9a9f314b8b",
     "node": "ffffffffffffffffffffffffffffffffffffffff",
-    "p1": [{"node": "cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b", "rev": 0}],
+    "parents": [{"node": "cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b", "rev": 0}],
     "tags": ["tip"]
    }
   ]
@@ -69,7 +69,7 b' with modifications'
     "dirty": "+",
     "id": "cb9a9f314b8b+",
     "node": "ffffffffffffffffffffffffffffffffffffffff",
-    "p1": [{"node": "cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b", "rev": 0}],
+    "parents": [{"node": "cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b", "rev": 0}],
     "tags": ["tip"]
    }
   ]

tests/test-merge-default.t

@@ -57,8 +57,7 b' Should succeed:'
     "dirty": "+",
     "id": "f25cbe84d8b3+2d95304fed5d+",
     "node": "ffffffffffffffffffffffffffffffffffffffff",
-    "p1": [{"node": "f25cbe84d8b320e298e7703f18a25a3959518c23", "rev": 4}],
-    "p2": [{"node": "2d95304fed5d89bc9d70b2a0d02f0d567469c3ab", "rev": 2}],
+    "parents": [{"node": "f25cbe84d8b320e298e7703f18a25a3959518c23", "rev": 4}, {"node": "2d95304fed5d89bc9d70b2a0d02f0d567469c3ab", "rev": 2}],
     "tags": ["tip"]
    }
   ]