Add a serverReadyAction.action to open the URI in the Viewer pane

[seeM]

There is existing support to configure debugging to run some action when a server starts, determined by scraping the contents of the terminal (docs). This is implemented in the debug-server-ready extension.

There are actions to open the URI externally, or debug in Chrome/Edge. We should add an action to open the URI in the Viewer pane.

Here's how you might use it with Streamlit.

1. Create an app.py file with:

   import pandas as pd
   df = pd.DataFrame({
     'first column': [1, 2, 3, 4],
     'second column': [10, 20, 30, 40]
   })
   df

2. Create a launch.json with:

   {
     "configurations": [
       {
         "name": "Streamlit",
         "type": "debugpy",
         "request": "launch",
         "module": "streamlit",
         "args": [
           "run",
           "${file}",
           "--server.headless",
           "true",
         ],
         "console": "integratedTerminal",
         "serverReadyAction": {
           "action": "openInViewer",
           "killOnServerStop": false,
           "pattern": "Local URL: http://localhost:([0-9]+)",
           "uriFormat": "http://localhost:%s",
         }
       }
     ]
   }

3. Start the Streamlit debugger configuration.
4. It should debug the app (stopping at any breakpoints) and display the app in the Viewer pane.

[testlabauto]

Verified Fixed

Positron Version(s) : 2024.09.0-11
OS Version          : OSX

Test scenario(s)

debugging with the specified launch.json works with the streamlit-py-example from qa-example-content

Link(s) to TestRail test cases run or created:
N/A