ls/ls-url: introduce --size

I really need it only for studio right now, but this is really nice to have in a daily life
as well.

E.g.

```
$ dvc ls-url . --size
108    Metadata-and-Results.dvc
97     AudioMP3.dvc
97     AudioWAV.dvc
12181  README.md
54     .gitignore
168    .gitattributes
99     VideoFlash.dvc
312    LICENSE.txt
139    .dvcignore
96     AudioMP3
96     Asset
192    .dvc
64     Metadata-and-Results
64     AudioWAV
192    Scripts
64     VideoFlash
384    .git
96     .vscode
```

```
$ dvc list . --size
139    .dvcignore
168    .gitattributes
54     .gitignore
96     .vscode
96     Asset
96     AudioMP3
97     AudioMP3.dvc
64     AudioWAV
97     AudioWAV.dvc
312    LICENSE.txt
64     Metadata-and-Results
108    Metadata-and-Results.dvc
12181  README.md
192    Scripts
64     VideoFlash
99     VideoFlash.dvc
```

dvc/commands/ls/__init__.py

@@ -11,7 +11,7 @@
 logger = logging.getLogger(__name__)
 
 
-def _prettify(entries, with_color=False):
+def format_entries(entries, with_color=False, with_size=False):
     if with_color:
         ls_colors = LsColors()
         fmt = ls_colors.format
@@ -20,7 +20,12 @@ def _prettify(entries, with_color=False):
         def fmt(entry):
             return entry["path"]
 
-    return [fmt(entry) for entry in entries]
+    def _row(entry):
+        if with_size:
+            return (entry.get("size") or ""), fmt(entry)
+        return (fmt(entry),)
+
+    return [_row(entry) for entry in entries]
 
 
 class CmdList(CmdBaseNoRepo):
@@ -41,8 +46,10 @@ def run(self):
             if self.args.json:
                 ui.write_json(entries)
             elif entries:
-                entries = _prettify(entries, with_color=True)
-                ui.write("\n".join(entries))
+                entries = format_entries(
+                    entries, with_color=True, with_size=self.args.size
+                )
+                ui.table(entries)
             return 0
         except DvcException:
             logger.exception("failed to list '%s'", self.args.url)
@@ -106,6 +113,11 @@ def add_parser(subparsers, parent_parser):
             "specified by '--remote') in the target repository."
         ),
     )
+    list_parser.add_argument(
+        "--size",
+        action="store_true",
+        help="Show sizes.",
+    )
     list_parser.add_argument(
         "path",
         nargs="?",

dvc/commands/ls_url.py

@@ -5,7 +5,7 @@
 from dvc.cli.utils import append_doc_link
 from dvc.ui import ui
 
-from .ls import _prettify
+from .ls import format_entries
 
 logger = logging.getLogger(__name__)
 
@@ -16,8 +16,8 @@ def run(self):
 
         entries = Repo.ls_url(self.args.url, recursive=self.args.recursive)
         if entries:
-            entries = _prettify(entries, with_color=True)
-            ui.write("\n".join(entries))
+            entries = format_entries(entries, with_color=True, with_size=self.args.size)
+            ui.table(entries)
         return 0
 
 
@@ -40,4 +40,9 @@ def add_parser(subparsers, parent_parser):
         action="store_true",
         help="Recursively list files.",
     )
+    lsurl_parser.add_argument(
+        "--size",
+        action="store_true",
+        help="Show sizes.",
+    )
     lsurl_parser.set_defaults(func=CmdListUrl)

dvc/repo/ls.py

@@ -109,6 +109,7 @@ def _ls(
             "isout": dvc_info.get("isout", False),
             "isdir": info["type"] == "directory",
             "isexec": info.get("isexec", False),
+            "size": info.get("size"),
         }
 
     return ret

dvc/repo/ls_url.py

@@ -20,6 +20,7 @@ def ls_url(url, *, config=None, recursive=False):
             ls_info = {
                 "path": fs.path.relpath(info["name"], fs_path),
                 "isdir": info["type"] == "directory",
+                "size": info.get("size"),
             }
             ret.append(ls_info)