std.Progress: support progress bar escape codes

[andrewrk]

Turns out there's escape codes for sending progress status to the terminal: https://conemu.github.io/en/AnsiEscapeCodes.html#ConEmu_specific_OSC

As far as I'm aware only Windows Terminal and Ghostty support these. I didn't get access to either one yet for testing so this PR is going in blind.

const std = @import("std");
const testing = std.testing;
const assert = std.debug.assert;

pub fn main() anyerror!void {
    const main_progress_node = std.Progress.start(.{
        .estimated_total_items = stuff.len,
        .initial_delay_ns = 0,
    });
    defer main_progress_node.end();

    for (&stuff) |name| {
        const node = main_progress_node.start(name, 0);
        defer node.end();
        std.Thread.sleep(100 * std.time.ns_per_ms);
    }
}

const stuff = [_][]const u8{
    "frobnicating",
    "confabulating",
    "prognosticating",
    "retabulating",
    "procrastinating",
    "masticating",
    "disenfranchising",
    "reticulating",
};

It integrates with --watch in the build system to set error state when failures occur, and clear it when they are fixed, also to clear progress when waiting for user input.

potential follow-up work:

• Improve the heuristic for when to use pulsing vs a number between 1-100.
• Improve the heuristic for mapping progress data to a number between 1-100.
• Consider not hiding progress during lockStderr
• (this applies to progress output too) if you hit ctrl+c, crap is leftover and not cleared. is there a solution? (other than adding a signal handler for this)

[mitchellh]

VTE supports it now too which should expand support considerably on Linux: https://www.phoronix.com/news/VTE-Terminals-Progress-Indicate

[alexrp]

Windows Powershell

More likely Windows Terminal, just so you don't open PowerShell in the legacy console host and get confused at why it's missing a bunch of features.

[ddogfoodd]

Worked for me on latest Ghostty, well done!

[andrewrk]

Alright I think this is good enough for a first version. I added std.Progress.setStatus and the following enum:

pub const Status = enum {
    /// Indicates the application is progressing towards completion of a task.
    /// Unless the application is interactive, this is the only status the
    /// program will ever have!
    working,
    /// The application has completed an operation, and is now waiting for user
    /// input rather than calling exit(0).
    success,
    /// The application encountered an error, and is now waiting for user input
    /// rather than calling exit(1).
    failure,
    /// The application encountered at least one error, but is still working on
    /// more tasks.
    failure_working,
};

[kcbanner]

Working nicely in Windows Terminal Preview 👍