lfs: convert '{lfs_files}' keyword to a hybrid list

This will allow more attributes about the file to be queried.

hgext/lfs/__init__.py

@@ -61,9 +61,11 b' from mercurial import ('
     localrepo,
     minifileset,
     node,
+    pycompat,
     registrar,
     revlog,
     scmutil,
+    templatekw,
     upgrade,
     vfs as vfsmod,
     wireproto,
@@ -221,8 +223,18 b' def extsetup(ui):'
 @templatekeyword('lfs_files')
 def lfsfiles(repo, ctx, **args):
     """List of strings. LFS files added or modified by the changeset."""
+    args = pycompat.byteskwargs(args)
+
     pointers = wrapper.pointersfromctx(ctx) # {path: pointer}
-    return sorted(pointers.keys())
+    files = sorted(pointers.keys())
+
+    makemap = lambda v: {
+        'file': v,
+    }
+
+    # TODO: make the separator ', '?
+    f = templatekw._showlist('lfs_file', files, args)
+    return templatekw._hybrid(f, files, makemap, pycompat.identity)
 
 @command('debuglfsupload',
          [('r', 'rev', [], _('upload large files introduced by REV'))])

tests/test-lfs.t

@@ -859,6 +859,11 b" there's no 'lfs' destination repo requir"
   oid sha256:5bb8341bee63b3649f222b2215bde37322bea075a30575aa685d8f8d21c77024
   size 29
   x-is-binary 0
+  $ hg --cwd convert_lfs log -r 'all()' -T '{rev}: {lfs_files % "{file}\n"}'
+  0: a1
+  1: a2
+  2: a2
+
   $ grep 'lfs' convert_lfs/.hg/requires
   lfs