live: Call webbrowser.open.

Use `funcy.once_per_args` decorator to prevent opening the html multiple times if user closes first time.

Closes iterative/dvclive#180

dvc/repo/live.py

@@ -1,6 +1,11 @@
 import logging
+import webbrowser
+from pathlib import Path
+from platform import uname
 from typing import TYPE_CHECKING, List, Optional
 
+from funcy import once_per_args
+
 from dvc.render.utils import render
 
 logger = logging.getLogger(__name__)
@@ -9,15 +14,27 @@ if TYPE_CHECKING:
     from dvc.output import Output
     from dvc.repo import Repo
 
+webbrowser_open = once_per_args(webbrowser.open)
+
 
 def create_summary(out):
+
     assert out.live and out.live["html"]
 
     metrics, plots = out.repo.live.show(out.fs_path)
 
     html_path = out.fs_path + "_dvc_plots"
 
-    render(out.repo, plots, metrics=metrics, path=html_path, refresh_seconds=5)
+    index_path = render(
+        out.repo, plots, metrics=metrics, path=html_path, refresh_seconds=5
+    )
+
+    url = index_path.as_uri()
+
+    if "Microsoft" in uname().release:
+        url = Path(index_path) / "index.html"
+
+    webbrowser_open(url)
 
 
 def summary_fs_path(out: "Output") -> Optional[str]:

tests/func/test_live.py

@@ -243,6 +243,7 @@ def test_live_checkpoints_resume(
 
 def test_dvc_generates_html_during_run(tmp_dir, dvc, mocker, live_stage):
     show_spy = mocker.spy(dvc.live, "show")
+    webbrowser_open = mocker.patch("dvc.repo.live.webbrowser_open")
 
     # make sure script takes more time to execute than one monitor sleep cycle
     monitor_await_time = 0.01
@@ -264,6 +265,7 @@ def test_dvc_generates_html_during_run(tmp_dir, dvc, mocker, live_stage):
     live_stage(summary=True, live="logs", code=script)
 
     assert show_spy.call_count == 2
+    assert webbrowser_open.call_count == 2
 
 
 def test_dvclive_stage_with_different_wdir(tmp_dir, scm, dvc):