Andrew Nosenko noseratio

Use Oh My Posh for the GitHub Copilot CLI statusline

GitHub Copilot CLI has an experimental statusline feature that can run a local command and render the command's output at the bottom of the Copilot terminal UI.

If you already use Oh My Posh, you can use the same engine, colors, and segments to render a Copilot-aware statusline in a few minutes.

This guide shows a Windows + PowerShell setup, but the idea is portable:

Copilot calls a local script.
Copilot sends session state to the script as JSON on stdin.

Rx.NET repo
Rx Design Guidelines
Rx Hands-on-Lab (HOL) for C# aka "Curing the asynchronous blues with the Reactive Extensions for .NET (C#)" repo
RX Intro by Lee Campbell (and his excellent free e-book, repo)

	from google.adk.agents import Agent
	from google.adk.events import Event
	from google.adk.agents.invocation_context import InvocationContext
	from google.genai.types import Content, Part
	from google.adk.tools.mcp_tool.mcp_toolset import MCPToolset
	from google.adk.tools.mcp_tool import StdioConnectionParams, StreamableHTTPConnectionParams, SseConnectionParams
	from google.adk.tools.agent_tool import AgentTool
	from pydantic import BaseModel, Field

	from mcp import StdioServerParameters

	// md wfapp
	// dotnet new winforms
	// then copy/paste this

	using System.Diagnostics;

	namespace wfapp;

	public partial class Form1 : Form
	{

	// https://twitter.com/noseratio/status/1597159958734217217

	using System.Diagnostics;

	namespace wfapp;

	public partial class Form1 : Form
	{
	// library code
	private static async Task LibApiAsync(Func<Task> waitForEvent)

	// A helper SynchronizationContext to debug deadlocks by @noseratio
	// If you install DebugSyncContext at the very beginning of your console app and run it under debugger,
	// it should stop where the deadlock is happening, with a better access to the stack frame.

	using System.Diagnostics;

	SynchronizationContext.SetSynchronizationContext(new DebugSyncContext());

	Console.WriteLine("Hello!");

	public sealed class AsyncQueue<T>: IAsyncDisposable
	{
	private readonly Queue<T> _queue = new();
	private readonly SemaphoreSlim _semaphore = new(initialCount: 1, maxCount: 1);
	private readonly CancellationTokenSource _cts = new();
	private TaskCompletionSource _itemTcs = new(TaskCreationOptions.RunContinuationsAsynchronously);

	public async ValueTask<(bool, T)> TryPeekAsync(CancellationToken cancelToken)
	{
	await _semaphore.WaitAsync(cancelToken);

	// https://twitter.com/noseratio/status/1535173151910350848
	// https://docs.microsoft.com/en-us/dotnet/core/extensions/generic-host

	using Microsoft.Extensions.DependencyInjection;
	using Microsoft.Extensions.Hosting;
	using Microsoft.Extensions.Logging;

	using var host = Host.CreateDefaultBuilder(Environment.GetCommandLineArgs())
	.ConfigureLogging(
	logging =>

	// by Theodor Zoulias
	// https://stackoverflow.com/questions/72558093/in-rx-net-how-do-i-make-a-subject-to-resemble-taskcompletionsource-behavior/72561100?noredirect=1#comment128188846_72561100
	//
	// comment out "#define USING_LAZY"

	#define USING_LAZY
	using System;
	using System.Reactive.Linq;
	using System.Reactive.Subjects;
	using System.Reactive.Threading.Tasks;

	// https://stackoverflow.com/q/72471152/1768303
	// https://dotnetfiddle.net/bLYDgw

	/*
	I don't think I should be seeing "Emitting: 19" after "Cancelling"

	Emitting: 18
	TakeUntil passed: 18
	OnNext: 18
	Cancelling