manifestcache: support multiple cache addition in one debug command run

This is more practical.

mercurial/debugcommands.py

@@ -1460,10 +1460,10 b' def debuglocks(ui, repo, **opts):'
 
 @command('debugmanifestfulltextcache', [
         ('', 'clear', False, _('clear the cache')),
-        ('a', 'add', '', _('add the given manifest node to the cache'),
+        ('a', 'add', [], _('add the given manifest nodes to the cache'),
          _('NODE'))
     ], '')
-def debugmanifestfulltextcache(ui, repo, add=None, **opts):
+def debugmanifestfulltextcache(ui, repo, add=(), **opts):
     """show, clear or amend the contents of the manifest fulltext cache"""
 
     def getcache():
@@ -1483,9 +1483,11 b' def debugmanifestfulltextcache(ui, repo,'
 
     if add:
         with repo.lock():
+            m = repo.manifestlog
+            store = m.getstorage(b'')
+            for n in add:
             try:
-                m = repo.manifestlog
-                manifest = m[m.getstorage(b'').lookup(add)]
+                    manifest = m[store.lookup(n)]
             except error.LookupError as e:
                 raise error.Abort(e, hint="Check your manifest node id")
             manifest.read()  # stores revisision in cache too

tests/test-manifest.t

@@ -148,3 +148,13 b' Check cache clearing'
   $ hg debugmanifestfulltextcache --clear
   $ hg debugmanifestfulltextcache
   cache empty
+
+Check adding multiple entry in one go:
+
+  $ hg debugmanifestfulltextcache --add fce2a30dedad1eef4da95ca1dc0004157aa527cf  --add 1e01206b1d2f72bd55f2a33fa8ccad74144825b7
+  $ hg debugmanifestfulltextcache
+  cache contains 2 manifest entries, in order of most to least recent:
+  id: 1e01206b1d2f72bd55f2a33fa8ccad74144825b7, size 133 bytes
+  id: fce2a30dedad1eef4da95ca1dc0004157aa527cf, size 87 bytes
+  total cache data size 268 bytes, on-disk 268 bytes
+  $ hg debugmanifestfulltextcache --clear