Use new vsc API to activate terminal without running any commands in terminal

Contribute to terminal environments

This new API allows extensions to change environment variables when the terminal is starting up.

• Support terminal activation for debugger without running Commands in terminal
• Running python in terminal will user correct environment even when terminal is already open
• Not polluting terminal history with unnecessary commands
• expose .env variables into terminal without activation of environment

const collection = window.getEnvironmentVariableCollection(true);
const separator = process.platform === 'win32' ? ';' : ':';
collection.prepend('PATH', `/foo${separator}`);
collection.replace('JAVA_HOME', '/bar');

[Tyriar]

The API moved to ExtensionContext late last month and should be stable in 1.46.

[mattseddon]

Thanks, @brettcannon. We do have one additional use case where the CLI is globally installed (could even be as a binary via brew for example) but the associated project uses some kind of virtual environment. Under these circumstances, we have to add the environment details to PATH as calling the CLI with /path/to/env/interpreter/python -m dvc some command throws an error.