prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  dvc dag --outs
  In the `0.xx` version days, there was a `dvc pipeline show --outs` command that was able to show a DAG that included outputs. 
  I thought this was a really nice feature. For instance, I have a `train_test_split` stage that creates two outputs, `train` and `test`, and it would be nice to see them taking different paths in the DAG.
  Can you maybe (re)implement this feature?
  Thanks!
  dvc dag --outs
  In the `0.xx` version days, there was a `dvc pipeline show --outs` command that was able to show a DAG that included outputs. 
  I thought this was a really nice feature. For instance, I have a `train_test_split` stage that creates two outputs, `train` and `test`, and it would be nice to see them taking different paths in the DAG.
  Can you maybe (re)implement this feature?
  Thanks!
  
  </issue>
  <code>
  [start of dvc/command/dag.py]
  1 import argparse
  2 import logging
  3 
  4 from dvc.command.base import CmdBase, append_doc_link
  5 from dvc.exceptions import DvcException
  6 
  7 logger = logging.getLogger(__name__)
  8 
  9 
  10 def _show_ascii(G):
  11     from dvc.dagascii import draw
  12     from dvc.repo.graph import get_pipelines
  13 
  14     pipelines = get_pipelines(G)
  15 
  16     ret = []
  17     for pipeline in pipelines:
  18         ret.append(draw(pipeline.nodes, pipeline.edges))
  19 
  20     return "\n".join(ret)
  21 
  22 
  23 def _show_dot(G):
  24     import io
  25 
  26     from networkx.drawing.nx_pydot import write_dot
  27 
  28     dot_file = io.StringIO()
  29     write_dot(G, dot_file)
  30     return dot_file.getvalue()
  31 
  32 
  33 def _build(G, target=None, full=False):
  34     import networkx as nx
  35 
  36     from dvc.repo.graph import get_pipeline, get_pipelines
  37 
  38     if target:
  39         H = get_pipeline(get_pipelines(G), target)
  40         if not full:
  41             descendants = nx.descendants(G, target)
  42             descendants.add(target)
  43             H.remove_nodes_from(set(G.nodes()) - descendants)
  44     else:
  45         H = G
  46 
  47     def _relabel(stage):
  48         return stage.addressing
  49 
  50     return nx.relabel_nodes(H, _relabel, copy=False)
  51 
  52 
  53 class CmdDAG(CmdBase):
  54     def run(self):
  55         try:
  56             target = None
  57             if self.args.target:
  58                 stages = self.repo.collect(self.args.target)
  59                 if len(stages) > 1:
  60                     logger.error(
  61                         f"'{self.args.target}' contains more than one stage "
  62                         "{stages}, please specify one stage"
  63                     )
  64                     return 1
  65                 target = stages[0]
  66 
  67             G = _build(self.repo.graph, target=target, full=self.args.full,)
  68 
  69             if self.args.dot:
  70                 logger.info(_show_dot(G))
  71             else:
  72                 from dvc.utils.pager import pager
  73 
  74                 pager(_show_ascii(G))
  75 
  76             return 0
  77         except DvcException:
  78             msg = "failed to show "
  79             if self.args.target:
  80                 msg += f"a pipeline for '{target}'"
  81             else:
  82                 msg += "pipelines"
  83             logger.exception(msg)
  84             return 1
  85 
  86 
  87 def add_parser(subparsers, parent_parser):
  88     DAG_HELP = "Visualize DVC project DAG."
  89     dag_parser = subparsers.add_parser(
  90         "dag",
  91         parents=[parent_parser],
  92         description=append_doc_link(DAG_HELP, "dag"),
  93         help=DAG_HELP,
  94         formatter_class=argparse.RawDescriptionHelpFormatter,
  95     )
  96     dag_parser.add_argument(
  97         "--dot",
  98         action="store_true",
  99         default=False,
  100         help="Print DAG with .dot format.",
  101     )
  102     dag_parser.add_argument(
  103         "--full",
  104         action="store_true",
  105         default=False,
  106         help=(
  107             "Show full DAG that the target belongs too, instead of "
  108             "showing DAG consisting only of ancestors."
  109         ),
  110     )
  111     dag_parser.add_argument(
  112         "target",
  113         nargs="?",
  114         help="Stage or output to show pipeline for (optional). "
  115         "Finds all stages in the workspace by default.",
  116     )
  117     dag_parser.set_defaults(func=CmdDAG)
  118
  [end of dvc/command/dag.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/dvc/command/dag.py b/dvc/command/dag.py
  --- a/dvc/command/dag.py
  +++ b/dvc/command/dag.py
  @@ -30,7 +30,7 @@
       return dot_file.getvalue()
   
   
  -def _build(G, target=None, full=False):
  +def _build(G, target=None, full=False, outs=False):
       import networkx as nx
   
       from dvc.repo.graph import get_pipeline, get_pipelines
  @@ -44,8 +44,25 @@
       else:
           H = G
   
  -    def _relabel(stage):
  -        return stage.addressing
  +    if outs:
  +        G = nx.DiGraph()
  +        for stage in H.nodes:
  +            G.add_nodes_from(stage.outs)
  +
  +        for from_stage, to_stage in nx.edge_dfs(H):
  +            G.add_edges_from(
  +                [
  +                    (from_out, to_out)
  +                    for from_out in from_stage.outs
  +                    for to_out in to_stage.outs
  +                ]
  +            )
  +        H = G
  +
  +    def _relabel(node):
  +        from dvc.stage import Stage
  +
  +        return node.addressing if isinstance(node, Stage) else str(node)
   
       return nx.relabel_nodes(H, _relabel, copy=False)
   
  @@ -64,7 +81,12 @@
                       return 1
                   target = stages[0]
   
  -            G = _build(self.repo.graph, target=target, full=self.args.full,)
  +            G = _build(
  +                self.repo.graph,
  +                target=target,
  +                full=self.args.full,
  +                outs=self.args.outs,
  +            )
   
               if self.args.dot:
                   logger.info(_show_dot(G))
  @@ -108,6 +130,13 @@
               "showing DAG consisting only of ancestors."
           ),
       )
  +    dag_parser.add_argument(
  +        "-o",
  +        "--outs",
  +        action="store_true",
  +        default=False,
  +        help="Print output files instead of stages.",
  +    )
       dag_parser.add_argument(
           "target",
           nargs="?",
  
verification_info: {"golden_diff": "diff --git a/dvc/command/dag.py b/dvc/command/dag.py\n--- a/dvc/command/dag.py\n+++ b/dvc/command/dag.py\n@@ -30,7 +30,7 @@\n     return dot_file.getvalue()\n \n \n-def _build(G, target=None, full=False):\n+def _build(G, target=None, full=False, outs=False):\n     import networkx as nx\n \n     from dvc.repo.graph import get_pipeline, get_pipelines\n@@ -44,8 +44,25 @@\n     else:\n         H = G\n \n-    def _relabel(stage):\n-        return stage.addressing\n+    if outs:\n+        G = nx.DiGraph()\n+        for stage in H.nodes:\n+            G.add_nodes_from(stage.outs)\n+\n+        for from_stage, to_stage in nx.edge_dfs(H):\n+            G.add_edges_from(\n+                [\n+                    (from_out, to_out)\n+                    for from_out in from_stage.outs\n+                    for to_out in to_stage.outs\n+                ]\n+            )\n+        H = G\n+\n+    def _relabel(node):\n+        from dvc.stage import Stage\n+\n+        return node.addressing if isinstance(node, Stage) else str(node)\n \n     return nx.relabel_nodes(H, _relabel, copy=False)\n \n@@ -64,7 +81,12 @@\n                     return 1\n                 target = stages[0]\n \n-            G = _build(self.repo.graph, target=target, full=self.args.full,)\n+            G = _build(\n+                self.repo.graph,\n+                target=target,\n+                full=self.args.full,\n+                outs=self.args.outs,\n+            )\n \n             if self.args.dot:\n                 logger.info(_show_dot(G))\n@@ -108,6 +130,13 @@\n             \"showing DAG consisting only of ancestors.\"\n         ),\n     )\n+    dag_parser.add_argument(\n+        \"-o\",\n+        \"--outs\",\n+        action=\"store_true\",\n+        default=False,\n+        help=\"Print output files instead of stages.\",\n+    )\n     dag_parser.add_argument(\n         \"target\",\n         nargs=\"?\",\n", "issue": "dvc dag --outs\nIn the `0.xx` version days, there was a `dvc pipeline show --outs` command that was able to show a DAG that included outputs. \r\nI thought this was a really nice feature. For instance, I have a `train_test_split` stage that creates two outputs, `train` and `test`, and it would be nice to see them taking different paths in the DAG.\r\nCan you maybe (re)implement this feature?\r\nThanks!\ndvc dag --outs\nIn the `0.xx` version days, there was a `dvc pipeline show --outs` command that was able to show a DAG that included outputs. \r\nI thought this was a really nice feature. For instance, I have a `train_test_split` stage that creates two outputs, `train` and `test`, and it would be nice to see them taking different paths in the DAG.\r\nCan you maybe (re)implement this feature?\r\nThanks!\n", "before_files": [{"content": "import argparse\nimport logging\n\nfrom dvc.command.base import CmdBase, append_doc_link\nfrom dvc.exceptions import DvcException\n\nlogger = logging.getLogger(__name__)\n\n\ndef _show_ascii(G):\n    from dvc.dagascii import draw\n    from dvc.repo.graph import get_pipelines\n\n    pipelines = get_pipelines(G)\n\n    ret = []\n    for pipeline in pipelines:\n        ret.append(draw(pipeline.nodes, pipeline.edges))\n\n    return \"\\n\".join(ret)\n\n\ndef _show_dot(G):\n    import io\n\n    from networkx.drawing.nx_pydot import write_dot\n\n    dot_file = io.StringIO()\n    write_dot(G, dot_file)\n    return dot_file.getvalue()\n\n\ndef _build(G, target=None, full=False):\n    import networkx as nx\n\n    from dvc.repo.graph import get_pipeline, get_pipelines\n\n    if target:\n        H = get_pipeline(get_pipelines(G), target)\n        if not full:\n            descendants = nx.descendants(G, target)\n            descendants.add(target)\n            H.remove_nodes_from(set(G.nodes()) - descendants)\n    else:\n        H = G\n\n    def _relabel(stage):\n        return stage.addressing\n\n    return nx.relabel_nodes(H, _relabel, copy=False)\n\n\nclass CmdDAG(CmdBase):\n    def run(self):\n        try:\n            target = None\n            if self.args.target:\n                stages = self.repo.collect(self.args.target)\n                if len(stages) > 1:\n                    logger.error(\n                        f\"'{self.args.target}' contains more than one stage \"\n                        \"{stages}, please specify one stage\"\n                    )\n                    return 1\n                target = stages[0]\n\n            G = _build(self.repo.graph, target=target, full=self.args.full,)\n\n            if self.args.dot:\n                logger.info(_show_dot(G))\n            else:\n                from dvc.utils.pager import pager\n\n                pager(_show_ascii(G))\n\n            return 0\n        except DvcException:\n            msg = \"failed to show \"\n            if self.args.target:\n                msg += f\"a pipeline for '{target}'\"\n            else:\n                msg += \"pipelines\"\n            logger.exception(msg)\n            return 1\n\n\ndef add_parser(subparsers, parent_parser):\n    DAG_HELP = \"Visualize DVC project DAG.\"\n    dag_parser = subparsers.add_parser(\n        \"dag\",\n        parents=[parent_parser],\n        description=append_doc_link(DAG_HELP, \"dag\"),\n        help=DAG_HELP,\n        formatter_class=argparse.RawDescriptionHelpFormatter,\n    )\n    dag_parser.add_argument(\n        \"--dot\",\n        action=\"store_true\",\n        default=False,\n        help=\"Print DAG with .dot format.\",\n    )\n    dag_parser.add_argument(\n        \"--full\",\n        action=\"store_true\",\n        default=False,\n        help=(\n            \"Show full DAG that the target belongs too, instead of \"\n            \"showing DAG consisting only of ancestors.\"\n        ),\n    )\n    dag_parser.add_argument(\n        \"target\",\n        nargs=\"?\",\n        help=\"Stage or output to show pipeline for (optional). \"\n        \"Finds all stages in the workspace by default.\",\n    )\n    dag_parser.set_defaults(func=CmdDAG)\n", "path": "dvc/command/dag.py"}]}