tool: support bold headers in Windows

[jay]

• If virtual terminal processing is enabled in Windows then use ANSI escape codes Esc[1m and Esc[22m to turn bold on and off.

Suggested-by: Gisle Vanem

Ref: #11770

Closes #xxxx

---

/cc @gvanem @dfandrich

[gvanem]

What could be done for the link-text on Windows? AFAIK, it's possible with underlined text under VTS,
but I'm not sure that's the same as for Unix. How does a LINK <url> look and work under Unix? Click on it and it opens the
default browser?

[bagder]

How does a LINK look and work under Unix? Click on it and it opens the default browser?

Click on it and the "default app" for that link type opens it, yes. Presumably typically a browser.

[gvanem]

Click on it and the "default app" for that link type opens it, yes.

That would be hard to accomplish on Windows I guess.

[DHowett]

That would be hard to accomplish on Windows I guess.

With Windows Terminal, you can Ctrl-click URLs to open them in your default browser. 🙂

[bagder]

With Windows Terminal, you can Ctrl-click URLs to open them in your default browser. 🙂

Yes, but with some of the other-systems terminals, we can also "mark up" relative URLs used in the headers and spell out the full URL for when someone clicks on them. Ie use more meta-data than what is visible on screen.

[DHowett]

If you end up using OSC 8 (the standard for hyperlinks in terminals) that will work on Windows as well!

[bagder]

Aha!