plot: accept any viable target in dvc repo (iterative#4602)

dvc/repo/plots/__init__.py

@@ -1,8 +1,10 @@
 import logging
+import os
 
 from funcy import first, project
 
-from dvc.exceptions import DvcException, NoPlotsError, OutputNotFoundError
+from dvc.exceptions import DvcException, NoPlotsError
+from dvc.path_info import PathInfo
 from dvc.schema import PLOT_PROPS
 from dvc.tree.repo import RepoTree
 from dvc.utils import relpath
@@ -142,23 +144,34 @@ def modify(self, path, props=None, unset=None):
 
 
 def _collect_plots(repo, targets=None, rev=None):
-    def _targets_to_outs(targets):
-        for t in targets:
-            try:
-                (out,) = repo.find_outs_by_path(t)
-                yield out
-            except OutputNotFoundError:
-                logger.warning(
-                    "File '{}' was not found at: '{}'. It will not be "
-                    "plotted.".format(t, rev)
-                )
-
-    if targets:
-        outs = _targets_to_outs(targets)
-    else:
-        outs = (out for stage in repo.stages for out in stage.outs if out.plot)
-
-    return {out.path_info: _plot_props(out) for out in outs}
+    plots = {out for stage in repo.stages for out in stage.outs if out.plot}
+
+    def to_result(plots):
+        return {plot.path_info: _plot_props(plot) for plot in plots}
+
+    if not targets:
+        return to_result(plots)
+
+    target_infos = {PathInfo(os.path.abspath(target)) for target in targets}
+
+    target_plots = set()
+    for p in plots:
+        if p.path_info in target_infos:
+            target_plots.add(p)
+            target_infos.remove(p.path_info)
+
+    tree = RepoTree(repo)
+    result = to_result(target_plots)
+
+    for t in target_infos:
+        if tree.isfile(t):
+            result[t] = {}
+        else:
+            logger.warning(
+                "'%s' was not found at: '%s'. It will not be plotted.", t, rev,
+            )
+
+    return result
 
 
 def _plot_props(out):

tests/func/plots/test_plots.py

@@ -330,7 +330,7 @@ def test_plot_even_if_metric_missing(
     with caplog.at_level(logging.WARNING, "dvc"):
         plots = dvc.plots.show(revs=["v1", "v2"], targets=["metric.json"])
         assert (
-            "File 'metric.json' was not found at: 'v1'. "
+            "'metric.json' was not found at: 'v1'. "
             "It will not be plotted." in caplog.text
         )
 
@@ -602,3 +602,56 @@ def test_multiple_plots(tmp_dir, scm, dvc, run_copy_metrics):
     )
 
     assert len(dvc.plots.show().keys()) == 2
+
+
+def test_show_non_plot(tmp_dir, scm, dvc):
+    metric = [
+        {"first_val": 100, "val": 2},
+        {"first_val": 200, "val": 3},
+    ]
+    _write_json(tmp_dir, metric, "metric.json")
+    plot_string = dvc.plots.show(targets=["metric.json"])["metric.json"]
+
+    plot_content = json.loads(plot_string)
+    assert plot_content["data"]["values"] == [
+        {
+            "val": 2,
+            PlotData.INDEX_FIELD: 0,
+            "first_val": 100,
+            "rev": "workspace",
+        },
+        {
+            "val": 3,
+            PlotData.INDEX_FIELD: 1,
+            "first_val": 200,
+            "rev": "workspace",
+        },
+    ]
+    assert plot_content["encoding"]["x"]["field"] == PlotData.INDEX_FIELD
+    assert plot_content["encoding"]["y"]["field"] == "val"
+
+
+def test_show_non_plot_and_plot_with_params(
+    tmp_dir, scm, dvc, run_copy_metrics
+):
+    metric = [
+        {"first_val": 100, "val": 2},
+        {"first_val": 200, "val": 3},
+    ]
+    _write_json(tmp_dir, metric, "metric.json")
+    run_copy_metrics(
+        "metric.json", "metric2.json", plots_no_cache=["metric2.json"]
+    )
+
+    dvc.plots.modify("metric2.json", props={"title": "TITLE"})
+    result = dvc.plots.show(targets=["metric.json", "metric2.json"])
+
+    plot_content = json.loads(result["metric.json"])
+    plot2_content = json.loads(result["metric2.json"])
+
+    assert plot2_content["title"] == "TITLE"
+
+    assert plot_content != plot2_content
+    plot_content.pop("title")
+    plot2_content.pop("title")
+    assert plot_content == plot2_content