Analyze dotnet containers build output

Program.cs

var lines = File.ReadAllLines("your raw pipeline output.txt");

// The file contains lots of lines, but we care about lines of the form:
//
// -- EXECUTING: docker info
// a bunch of other lines...
// commmand output, etc...
// -- EXECUTION ELAPSED TIME: 00:00:00.0179437
//
// We want to extract the command and the elapsed time from each of these pairings.

var commands = new List<Command>();
string? currentCommand = null;

// <copilot>
foreach (var line in lines)
{
    // Check if this is an executing line
    if (line.Contains("-- EXECUTING: "))
    {
        // Extract the command after "-- EXECUTING: "
        var executingIndex = line.IndexOf("-- EXECUTING: ");
        currentCommand = line.Substring(executingIndex + "-- EXECUTING: ".Length).Trim();
    }
    // Check if this is an elapsed time line and we have a current command
    else if (line.Contains("-- EXECUTION ELAPSED TIME: ") && currentCommand != null)
    {
        // Extract the time after "-- EXECUTION ELAPSED TIME: "
        var timeIndex = line.IndexOf("-- EXECUTION ELAPSED TIME: ");
        var timeString = line.Substring(timeIndex + "-- EXECUTION ELAPSED TIME: ".Length).Trim();

        // Parse the TimeSpan
        if (TimeSpan.TryParse(timeString, out var elapsed))
        {
            commands.Add(new Command(currentCommand, elapsed));
            currentCommand = null; // Reset for next command
        }
    }
}
// </copilot>

var buildCommands = commands
    .Where(command => command.Name.StartsWith("docker build"))
    .Select(command => command with
        {
            Name = command.Name
                .Split(' ')
                .Where(s => s.Contains("Dockerfile"))
                .Last()
                .Replace("dotnet-dotnet-buildtools-prereqs-docker/", "")
        })
    .OrderByDescending(command => command.Elapsed);

var totalBuildTime =
    buildCommands
        .Aggregate(TimeSpan.Zero, (acc, c) => acc + c.Elapsed)
        .ToString("hh\\:mm\\:ss\\.fff");

var buildCommandsList =
    string.Join(Environment.NewLine,
        buildCommands.Select(command =>
            $"{command.Elapsed:hh\\:mm\\:ss\\.fff} - {command.Name}"));

Console.WriteLine(
    $"""

    Sum of dotnet build commands: {totalBuildTime}

    Commands:
    {buildCommandsList}

    """);

record Command(string Name, TimeSpan Elapsed);