Add a Open to Remote Container option from the CLI

[DanTup]

After running devcontainer up --workspace-folder . I'd like to be able to automate opening VS Code with this project in a devcontainer (without having to additionally click on the notification inside VS Code).

This was raised before at #9824 and the response was:

Works for me exactly as you describe:

$ devcontainer open .
[246 ms] @devcontainers/cli 0.58.0. Node.js v18.18.2. linux 6.5.0-28-generic x64.

However, this doesn't seem to work - there is no open subcommand for devcontainer as far as I can tell. I don't know if this is related to devcontainers/cli#66 which suggests there may have previously been a VS-Code-specific version of this CLI?

I've also tried various combinations of code --folder-uri "vscode-remote://..." but I can't figure out the right syntax for that and I can't find any documentation on the format.

[DanTup]

Apparently the correct syntax for the open command is like:

function Encode-ContainerName {
    param([string]$name)
    $bytes = [System.Text.Encoding]::UTF8.GetBytes($name)
    ($bytes | ForEach-Object { $_.ToString("x2") }) -join ''
}

$encodedName = Encode-ContainerName $containerName
code --folder-uri "vscode-remote://attached-container+$encodedName/workspaces/my-project"

And getting the container name requires an additional command:

devcontainer up --workspace-folder . --id-label devname=$containerLabel
$containerName = (docker ps -aqf "label=devname=$containerLabel" | Out-String).Trim()

So I have this working, but I feel like this could/should be wrapped up somewhere in a simple command that doesn't require a script with all of this.