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[GH-ISSUE #1079] ANSI - VT510 -> DECDHL—Double-Width, Double-Height Line - support. #783

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opened 2026-03-04 01:07:42 +03:00 by kerem · 4 comments

kerem commented

2026-03-04 01:07:42 +03:00

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Originally created by @matho53 on GitHub (Mar 24, 2025).
Original GitHub issue: https://github.com/rivo/tview/issues/1079

I'm hoping to have the ability to use DECDHL, in a TUI application.

like this:

But every time i try, the escape sequence is ignored...

sample code:

...
func fakeSearch(input int) string {
	return fmt.Sprintf("MATCHING\nRECORDS:\n\x1b#3%d\n\x1b#4%d", input, input)
	//return fmt.Sprintf("MATCHING\nRECORDS:\n%d", input)
}
...
	matchingRecordsBox := tview.NewTextView().
		SetText(fakeSearch(112)).
		SetTextAlign(tview.AlignCenter).
		//SetTextColor(tcell.ColorAqua).
		SetDynamicColors(true).
		SetMaxLines(4)
	matchingRecordsBox.SetBorder(true)
...

See original vt510 documentation:-
https://manx-docs.org/collections/mds-199909/cd3/term/vt510rmb.pdf -> pg 5-37

I can replicate DECDHL in Go using these options:

*Note - Windows terminal released the feature in version v1.17.1023
See release notes and search for "DECDHL" -> https://github.com/microsoft/terminal/releases/tag/v1.17.1023

Originally created by @matho53 on GitHub (Mar 24, 2025). Original GitHub issue: https://github.com/rivo/tview/issues/1079 I'm hoping to have the ability to use DECDHL, in a TUI application. like this: ![Image](https://github.com/user-attachments/assets/cd3dfd2e-06d0-48ff-a8c8-c6477f1aa9c6) But every time i try, the escape sequence is ignored... sample code: ``` ... func fakeSearch(input int) string { return fmt.Sprintf("MATCHING\nRECORDS:\n\x1b#3%d\n\x1b#4%d", input, input) //return fmt.Sprintf("MATCHING\nRECORDS:\n%d", input) } ... matchingRecordsBox := tview.NewTextView(). SetText(fakeSearch(112)). SetTextAlign(tview.AlignCenter). //SetTextColor(tcell.ColorAqua). SetDynamicColors(true). SetMaxLines(4) matchingRecordsBox.SetBorder(true) ... ``` ![Image](https://github.com/user-attachments/assets/438dd173-7d2a-41fd-b5f9-f89dc2e73d6f) See original vt510 documentation:- https://manx-docs.org/collections/mds-199909/cd3/term/vt510rmb.pdf -> pg 5-37 I can replicate DECDHL in Go using these options: ![Image](https://github.com/user-attachments/assets/7cda72da-9eed-4022-8363-d975213e685b) *Note - Windows terminal released the feature in version v1.17.1023 See release notes and search for "DECDHL" -> https://github.com/microsoft/terminal/releases/tag/v1.17.1023

kerem closed this issue

2026-03-04 01:07:43 +03:00

kerem commented

2026-03-04 01:07:43 +03:00

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@rivo commented on GitHub (Mar 26, 2025):

That's not how tview (or even tcell) works. Adding escape codes to a TextView will not have the intended effect. tview draws individual characters on the screen (using tcell). \x1b will just be treated like one such character. Because most fonts don't show anything for this character, it will just show up as an empty cell.

You could contact the maintainer of https://github.com/gdamore/tcell if he wants to support this mode. But I would not get my hopes up.

@rivo commented on GitHub (Mar 26, 2025): That's not how `tview` (or even `tcell`) works. Adding escape codes to a `TextView` will not have the intended effect. `tview` draws individual characters on the screen (using `tcell`). `\x1b` will just be treated like one such character. Because most fonts don't show anything for this character, it will just show up as an empty cell. You could contact the maintainer of https://github.com/gdamore/tcell if he wants to support this mode. But I would not get my hopes up.

kerem commented

2026-03-04 01:07:44 +03:00

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@matho53 commented on GitHub (Mar 27, 2025):

Thanks Rivo,
I'll follow your direction re: gdamore/tcell.
I appreciate any time u took to look into, and your description makes perfect sense.

Also agree it might be a bit of an ask to get support for DECDHL :)

I'm trying my best to clone "The fugitive" TUI using tview... the hospital scene ~1:06 minutes in.

Getting close to replicating:

@matho53 commented on GitHub (Mar 27, 2025): Thanks Rivo, I'll follow your direction re: gdamore/tcell. I appreciate any time u took to look into, and your description makes perfect sense. Also agree it might be a bit of an ask to get support for DECDHL :) I'm trying my best to clone "The fugitive" TUI using tview... the hospital scene ~1:06 minutes in. ![Image](https://github.com/user-attachments/assets/90eea104-d649-45ec-b666-f678f121461f) ![Image](https://github.com/user-attachments/assets/6d4e49e3-18d4-42a0-84c3-e32197d038bd) Getting close to replicating: ![Image](https://github.com/user-attachments/assets/dad1481e-57dd-49bb-9593-fd32fa466e4e)

kerem commented

2026-03-04 01:07:44 +03:00

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@rivo commented on GitHub (Mar 27, 2025):

To me, the screenshot doesn't look like an actual terminal application but rather like a photoshopped image shown on a CRT. The cells don't line up, the rows are unevenly distributed, and the highlighting doesn't look like any terminal would display it. From all I know about screen design in Hollywood, they don't usually program actual terminal software but use other visual design tools (e.g. Adobe After Effects).

There are a few blogs which collect these and try to figure out how they were done.

@rivo commented on GitHub (Mar 27, 2025): To me, the screenshot doesn't look like an actual terminal application but rather like a photoshopped image shown on a CRT. The cells don't line up, the rows are unevenly distributed, and the highlighting doesn't look like any terminal would display it. From all I know about screen design in Hollywood, they don't usually program actual terminal software but use other visual design tools (e.g. Adobe After Effects). There are a few blogs which collect these and try to figure out how they were done.

kerem commented

2026-03-04 01:07:44 +03:00

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@matho53 commented on GitHub (Mar 28, 2025):

You could be onto something "after affects" was released in 93.. film was released in 93...
When i look at the footage it looks legit, but it could be just Hollywood.

https://github.com/user-attachments/assets/9664dc10-1136-4074-bb04-c046a00fe91d

@matho53 commented on GitHub (Mar 28, 2025): You could be onto something "after affects" was released in 93.. film was released in 93... When i look at the footage it looks legit, but it could be just Hollywood. https://github.com/user-attachments/assets/9664dc10-1136-4074-bb04-c046a00fe91d