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# REPL UI layout spec
Captured from a real run (pty + VT102 emulator, 100x30). This file is the
editing surface for the interactive shell's chrome: change any line below,
paste it back, and the implementation follows. Every visual token maps to one
function in `src/agent/theme.ts`, so color changes are one-line edits.
## State 1: idle prompt
```text
1| <- blank
2| ▄▟▙▄ copperhead v0.7.0 <- mark[copper] name[bold] version[dim]
3| ███ ███ claude via flag · kicad-cli 9.0.4 <- mark[copper] meta[dim]
4| ▀▜▛▀ ~/Github/chouhan-industries/copperhead <- mark[copper] cwd[dim]
5| <- blank
6| ▎ New repository? <- bar[copper] title[copper]
7| ▎ `copperhead init` scaffolds docs/ from an existing schematic <- bar[copper] body[default]
8| ▎ `copperhead demo` runs the USB-C breakout create pipeline <- bar[copper] body[default]
9| ▎ Docs: https://docs.copperhead.sh <- bar[copper] body[copper]
10| <- content region: echoes + agent
..| ❯ rename net KEY_DAH to KEY_DASH <- output scroll here, oldest
..| ▸ run_erc clean — 0 violations <- scrolls off the top
26| ● claude · main* <- meta right-aligned: dot[copper] text[dim]
27|────────────────────────────────────────────────────────────────────── <- rule[dim], full width
28|❯ Try "add reverse-polarity protection on VIN" <- prompt[copper]+nbsp, caret = real cursor, placeholder[dim] typed[bright]
29|────────────────────────────────────────────────────────────────────── <- rule[dim], full width
30| / for commands · pgup history · ctrl+c twice to quit In copperhead <- left[dim] right[dim]
```
## State 2: slash menu open (overlays upward, input row never moves)
```text
16| ❯ /demo what copperhead does + how to try it <- hovered: ❯[copper] label+desc[copperLight], desc wraps to a 2nd row
17| /examples example change-request prompts <- label[default] desc[default]
..| ...up to 10 items...
26| ↓ 10 more <- overflow marker[dim]
27|────────────────────────────────────────────────────────────────────── <- rule[dim]
28|❯ / <- typed filter[bright]
29|────────────────────────────────────────────────────────────────────── <- rule[dim]
30| / for commands · pgup history · ctrl+c twice to quit In copperhead
```
## State 3: agent turn running (observability row pinned in the dock)
```text
26| ● claude · main* <- meta stays
27|──────────────────────────────────────────────────────────────────────
28|⠹ Reflowing... turn 2/40 · 1.2k in / 300 out · 12s · ERC <- word left[copper], stats right[dim] busy[warn]
29|──────────────────────────────────────────────────────────────────────
30| ctrl+c interrupts the run · output above scrolls into history
```
The working word is a PCB term (Routing, Etching, Reflowing, Soldering,
Drilling, Plating, Probing, Fluxing, Tinning, Laminating, Silkscreening,
Panelizing), one per turn, with animated dots: Claude Code's working verbs,
board-shop edition; on rotation the old word crossfades char by char
through `_` slots, dots included. Durable output (tool lines, turn markers, the outcome)
scrolls in the content region; the observability row never moves. Between
submit and the first turn a passive `… working` row shows briefly.
First Ctrl+C at the prompt: input clears, row 30 becomes `press ctrl+c again to exit` [warn].
History: every content line is kept in a session buffer (cap 5000). PgUp at
the prompt scrolls the content region back through it (arrow keys / mouse
wheel line-scroll too at an empty prompt), PgDn scrolls forward,
any other key snaps back to the live tail; row 30 shows
`history ↑N · pgup/pgdn scroll · any key returns` while scrolled. The same
lines are mirrored by default to `.copperhead/runs/repl-<timestamp>.log`
(plain text: SGR stripped, `sk-` keys redacted per AC-4.1); the path is
printed when the session ends. Injected loggers (tests/embeds) disable the
file sink.
Startup: the full screen loads instantly (banner, callout, input dock), then
the mark pulses in place twice over rows 2-4 (dot, thin ring, thick
ring, full via) while the prompt is already usable. First run in a repo (no
`.copperhead/` yet) uses slow timing (110ms/frame) and shows the New
repository callout; later runs pulse fast (45ms/frame) and hide it.
## Color tokens (src/agent/theme.ts)
| Token | SGR | Current value | Used for |
| ------------- | ------------------ | ------------------------- | -------------------------------------- |
| `copper` | `38;2;184;115;51` | #b87333 (brand: #b87333) | mark, prompt ❯, callout bar, meta dot |
| `copperLight` | `38;2;238;201;165` | #eec9a5 (accent-high) | hovered menu row |
| `bold` | `1` | bold, default fg | `copperhead` name (theme-adaptive) |
| `bright` | `97` | white | typed input text |
| `dim` | `38;2;153;153;153` | #999999 (SGR 90 fallback) | hints, placeholder, version, paths |
| `ruleDim` | `38;2;136;136;136` | #888888 (SGR 90 fallback) | input-area rules |
| `ok` | `32` | green | success lines (`check: all green`) |
| `warn` | `33` | amber | ctrl+c hint, cautions |
| `err` | `31` | red | failures |
Note: `copper` is the exact brand #b87333 on truecolor terminals
(COLORTERM=truecolor/24bit); terminals without truecolor fall back to
256-color 173. See [claude-ui-layout.md](claude-ui-layout.md) for the measured
Claude Code reference palette to diff against.
## Region -> source map
| Region | Source |
| --------------------- | ----------------------------------------------- |
| Banner + callout | `banner()` in `src/commands/repl.ts` |
| Meta line, status bar | `ask()` options in `src/commands/repl.ts` |
| Input rows, menu | `src/util/live-prompt.ts` (`renderDock`) |
| Rules, callout, bars | `src/agent/box.ts` |
| Screen ownership | `src/util/dock.ts` (alt screen + DECSTBM fence) |
To iterate: edit the annotated lines above (text, alignment, or `[token]`
tags), paste the block back, and the code gets updated to match. Verify with
`npm run demo:ui` (see below).
## Demo recording (npm run demo:ui)
`npm run demo:ui` from the repo root runs `scripts/ui-demo.ts` via tsx: the
real REPL UI with a canned agent run, no build step, no API key, no repo
mutations. Same script every take, so recordings are reproducible.
Standard take:
1. Let the banner settle and the via mark pulse
2. Type `/`, hover a few commands with the arrow keys, Esc to dismiss
3. Type `rename net KEY_DAH to KEY_DASH`, Enter, let the mock run play
(~17s, four sections: propose, edit, verify, remember, each closed by a
summary line; the pinned observability row animates and the working word
morphs at each section)
4. `/check` for the mock green ERC/DRC/drift pass
5. Ctrl+C twice to exit
The demo uses the current directory as the repo. A directory that already has
`.copperhead/` gets the fast mark pulse and no callout; for the full
first-run intro (slow pulse + New repository callout), run from a fresh
directory:
```bash
cd $(mktemp -d) && node <repo>/node_modules/.bin/tsx <repo>/scripts/ui-demo.ts
```
The mark itself can be regenerated from the website logo geometry at any
size with `node scripts/gen-logo.mjs <rows>`.