Glyph composition

[cormullion]

Discord username (optional)

No response

Describe the bug

Terminals usually let you type two characters to produce one. For example, 'e' U+0065 followed by U+0301 should give 'é'.

In this github text box, you can type 'x' followed by U+0302 to get 'x̂'. (using the Unicode Hex Input keyboard, and hold down Option while you type '0302').

In REPLs such as Julia, you want to type maths stuff such as x̂.

These composite characters are accepted by the terminal, but don't appear on the screen.

To Reproduce

Type x followed by U+0302 to get 'x̂'. (with the MacOS Unicode Hex Input keyboard selected, type x, then hold down Option while you type 0302).

Expected behaviour

x̂

Screenshots

MacOS terminal on the right:

Operating System

MacOS

OS Version

12.0.1

Shell Version

zsh 5.8 (x86_64-apple-darwin21.0)

Warp Version

v0.2022.09.13.08.15.stable_03

Additional context

No response

Does this block you from using Warp daily?

No

Warp Internal (ignore): linear-label:b8107fdf-ba31-488d-b103-d271c89cac3e

No response

[cormullion]

For extra credit, test with more than two glyphs. This is MacOS Terminal:

[elviskahoro]

Thanks for the very clear repro instructions. This would be a big project for us and I'll let you when it starts to be worked on!

[NittanyLion]

@elviskahoro any progress on this? It's still an issue (in Ubuntu).

[elviskahoro]

Best people to ping are probably @dannyneira and @vorporeal

[dannyneira]

@NittanyLion We did add Ligature support back in July 2024, but there were a lot more 👍 's on that request and it took a few years.

To anyone else interested in this feature, please add a 👍 to the original post at the top to signal that you want this feature, and subscribe if you'd like to be notified.

[NittanyLion]

Thank you @dannyneira . (This issue is a nuisance.)

Could you explain why it is difficult to have the desired behavior in the REPL when you already have it on the command line and the standard terminal app has it in both the REPL and on the command line?

[dannyneira]

REPLs would require warpification, like the shells we support, in order to support this. Since Warp is a wrapper around the shell to enable such features like Blocks and the AI agent. We're tracking support for REPLs seperately here: #4082

[vorporeal]

@NittanyLion I just tested this, and when I enabled support for ligatures in the terminal grid, the x̂ appeared correctly. Can you give that a try?

[NittanyLion]

Thank you @vorporeal

The diacritics show up, but in the wrong place:

(This appears to be independent of font choice)

The same character copied to the Warp terminal: