Traditional interfaces rely on 128 Unicode Box Drawing glyphs that consume entire rows and columns, losing up to eight rows in nested panel layouts. The new edge-rendered boundaries resolve this issue by allowing text elements and gridlines to extend directly to pane perimeters without displacing character space. Implemented as a Ghostty patch following an earlier Rio version, the system also cleans up clipboard interactions by omitting borders from copied text. Demonstration apps built with Ratatui include automatic fallbacks to legacy box characters while feedback is gathered from the community.
Key points
Drawing borders along cell perimeters recovers valuable terminal real estate previously l…: Drawing borders along cell perimeters recovers valuable terminal real estate previously lost to box-drawing characters.
Edge-rendered boundaries eliminate graphical glitches such as background color mismatches…: Edge-rendered boundaries eliminate graphical glitches such as background color mismatches on traditional corner characters.
Built-in fallbacks ensure that terminal applications remain fully compatible with standar…: Built-in fallbacks ensure that terminal applications remain fully compatible with standard Unicode box-drawing glyphs when unsupported.
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This post (and the code behind it) was written with a lot of help from AI. I'm not going to apologize for that. If that bothers you, feel free to close the tab.
I maintain Ratatui, so I see a lot of the TUIs people build. Many of them end up looking fairly same-ish: plain boxes on a boring background, missing a bunch of the things that good design in other mediums brings us.
Borders are part of the problem. They have to take up space, so they become part of the panels
people want to build. One option is to drop them and just use color, but borders are really nice
for delineating and surrounding things. There are lots of ways to sort of get borders in a
terminal, but none that are 100% good. I've drawn enough ┌──┐
by hand to have opinions about
this.
The usual way is the Unicode Box Drawing block, which has 128 characters for lines, corners and joins. Somehow that's still not enough:
So I've been working on a terminal protocol that draws…
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