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feat(tui): expand light-terminal auto-detection (HERMES_TUI_THEME, background hex) (#17113)
* feat(tui): expand light-terminal auto-detection (HERMES_TUI_THEME, BG hex)
Modern terminals (Ghostty, Warp, iTerm2) don't set COLORFGBG, so the
auto-light path was effectively COLORFGBG-only and silently broken for
many users. Two pragmatic additions, both opt-in, plus a clearer
priority chain:
1. **`HERMES_TUI_THEME=light|dark`** as a symmetric explicit override.
The existing `HERMES_TUI_LIGHT` is fine but reads as boolean noise;
a named theme env var matches `display.skin` muscle memory.
2. **`HERMES_TUI_BACKGROUND` hex/rgb hint.** Lets advanced users
(or a future OSC11 query helper that caches the answer) state a
ground-truth background colour. Decoded to Rec. 709 luma; ≥ 0.6
counts as light.
Priority order is now fully ordered and explainable:
1. `HERMES_TUI_LIGHT` (1/0/true/false/on/off).
2. `HERMES_TUI_THEME=light|dark`.
3. `HERMES_TUI_BACKGROUND` luminance.
4. `COLORFGBG` last field — light slots 7/15 → light, 0–15 → dark
(authoritative when set, so the new TERM_PROGRAM path can never
stomp on a terminal that already volunteered a dark answer).
5. `TERM_PROGRAM` allow-list — empty by default. The slot is left
in place because folks asked for it but populating it risks
wrongly flipping users on Apple_Terminal / iTerm2 dark profiles
to light. Easy to add per terminal once we have signal.
Tests: 5 new cases in `theme.test.ts` covering theme env, background
hex (3- and 6-char), invalid hex falling through, and COLORFGBG taking
precedence over the future allow-list.
Validation: `npm run type-check` clean, `npm test --run` 392/392.
* review(copilot): tighten theme detection comments + drop unnecessary cast
* review(copilot): strict hex regex so partial garbage doesn't slip into luminance
* test(tui): make TERM_PROGRAM allow-list injectable so precedence is provable
Copilot review on PR #17113: `LIGHT_DEFAULT_TERM_PROGRAMS` is empty
in production, so the prior assertion would have passed even if
`detectLightMode` ignored `COLORFGBG` entirely. That defeats the
test's purpose.
`detectLightMode` now takes the allow-list as an optional second
argument (defaults to the production set). The test injects a set
containing `Apple_Terminal`, asserts the allow-list alone WOULD
return light, then asserts `COLORFGBG: '15;0'` overrides it — the
precedence rule is now exercised, not assumed.
* fix(tui): COLORFGBG empty-trailing-field falls through; isolate DEFAULT_THEME tests
Round 2 Copilot review on PR #17113:
1. `Number(colorfgbg.split(';').at(-1))` returns 0 for an empty trailing
field (e.g. `COLORFGBG='15;'` → bg===0), which would have looked
like an authoritative dark slot and incorrectly blocked the
TERM_PROGRAM allow-list. Added a `/^\d+$/` guard before coercion;
non-numeric trailing fields now fall through.
2. Fixed the misleading '0–6 / 8–15 ranges are dark' comment — the
block returns true for bg===15, so the range is actually 0–6 / 8–14.
3. `DEFAULT_THEME` is computed from `process.env` at module-load.
A developer shell with `HERMES_TUI_THEME=light` (or a bright
`HERMES_TUI_BACKGROUND`) would flip it and break local tests.
The DEFAULT_THEME describe blocks now sterilize the relevant env
vars + dynamically import theme.ts (vi.resetModules pattern from
platform.test.ts). fromSkin tests compare against DARK_THEME
directly to decouple them from ambient env.
* test(tui): isolate ALL env-coupled theme symbols, not just DEFAULT_THEME
Round 3 Copilot review on PR #17113: the static top-level imports of
`fromSkin`, `DARK_THEME`, `LIGHT_THEME` evaluated theme.ts before
`importThemeWithCleanEnv` had a chance to clean the env. Because
`fromSkin` closes over `DEFAULT_THEME`, an ambient `HERMES_TUI_THEME=light`
or bright `HERMES_TUI_BACKGROUND` would still flip the base palette
and cause local-only failures.
Removed the static import entirely. Every test now obtains its theme
symbols via `importThemeWithCleanEnv`, including `detectLightMode`
(for consistency, even though it takes env as a parameter).
`fromSkin` tests assert against the cleaned `DEFAULT_THEME` from the
same dynamic import — preserves the actual contract (skins extend the
ambient base palette) without coupling the test to dev-shell state.
Verified by running with HERMES_TUI_THEME=light + HERMES_TUI_BACKGROUND=#ffffff:
all 20 theme tests still pass.
Self-review (avoid round 4):
- Audited other test files importing DEFAULT_THEME (syntax.test.ts,
streamingMarkdown.test.ts, constants.test.ts) — all just pass it as
a parameter or assert palette property existence (works on both
light + dark), so no env coupling there.
This commit is contained in:
brooklyn!
GitHub
parent
1e326c686d
commit
258efb2575
2 changed files with 260 additions and 27 deletions
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@ -1,46 +1,90 @@
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import { describe, expect, it } from 'vitest'
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import { afterEach, describe, expect, it, vi } from 'vitest'
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import { DARK_THEME, DEFAULT_THEME, detectLightMode, fromSkin, LIGHT_THEME } from '../theme.js'
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// `theme.js` reads `process.env` at module-load to compute DEFAULT_THEME,
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// and `fromSkin` closes over DEFAULT_THEME. A developer shell with
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// HERMES_TUI_THEME=light (or HERMES_TUI_BACKGROUND set to something
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// bright) would flip the base and turn these assertions into a local-
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// only failure. We sterilize the relevant env vars + dynamically
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// import the module fresh so EVERY symbol that closes over the env
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// (DEFAULT_THEME, DARK_THEME, LIGHT_THEME, fromSkin) is loaded against
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// a known-empty environment.
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//
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// `detectLightMode` takes env as an explicit arg, so it's safe to import
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// statically — but we stay consistent and dynamic-import it too.
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const RELEVANT_ENV = [
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'HERMES_TUI_LIGHT',
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'HERMES_TUI_THEME',
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'HERMES_TUI_BACKGROUND',
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'COLORFGBG',
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'TERM_PROGRAM',
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] as const
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async function importThemeWithCleanEnv() {
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for (const key of RELEVANT_ENV) {
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vi.stubEnv(key, '')
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}
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vi.resetModules()
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return import('../theme.js')
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}
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afterEach(() => {
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vi.unstubAllEnvs()
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vi.resetModules()
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})
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describe('DEFAULT_THEME', () => {
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it('has brand defaults', () => {
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it('has brand defaults', async () => {
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const { DEFAULT_THEME } = await importThemeWithCleanEnv()
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expect(DEFAULT_THEME.brand.name).toBe('Hermes Agent')
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expect(DEFAULT_THEME.brand.prompt).toBe('❯')
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expect(DEFAULT_THEME.brand.tool).toBe('┊')
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})
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it('has color palette', () => {
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it('has color palette', async () => {
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const { DEFAULT_THEME } = await importThemeWithCleanEnv()
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expect(DEFAULT_THEME.color.gold).toBe('#FFD700')
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expect(DEFAULT_THEME.color.error).toBe('#ef5350')
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})
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})
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describe('LIGHT_THEME', () => {
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it('avoids bright-yellow accents unreadable on white backgrounds (#11300)', () => {
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it('avoids bright-yellow accents unreadable on white backgrounds (#11300)', async () => {
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const { LIGHT_THEME } = await importThemeWithCleanEnv()
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expect(LIGHT_THEME.color.gold).not.toBe('#FFD700')
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expect(LIGHT_THEME.color.amber).not.toBe('#FFBF00')
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expect(LIGHT_THEME.color.dim).not.toBe('#B8860B')
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expect(LIGHT_THEME.color.statusWarn).not.toBe('#FFD700')
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})
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it('keeps the same shape as DARK_THEME', () => {
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it('keeps the same shape as DARK_THEME', async () => {
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const { DARK_THEME, LIGHT_THEME } = await importThemeWithCleanEnv()
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expect(Object.keys(LIGHT_THEME.color).sort()).toEqual(Object.keys(DARK_THEME.color).sort())
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expect(LIGHT_THEME.brand).toEqual(DARK_THEME.brand)
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})
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})
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describe('DEFAULT_THEME aliasing', () => {
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it('defaults to DARK_THEME when nothing signals light', () => {
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expect(DEFAULT_THEME).toBe(DARK_THEME)
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it('defaults to DARK_THEME when nothing signals light', async () => {
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const { DEFAULT_THEME, DARK_THEME: DARK } = await importThemeWithCleanEnv()
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expect(DEFAULT_THEME).toBe(DARK)
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})
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})
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describe('detectLightMode', () => {
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it('returns false on empty env', () => {
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it('returns false on empty env', async () => {
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const { detectLightMode } = await importThemeWithCleanEnv()
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expect(detectLightMode({})).toBe(false)
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})
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it('honors HERMES_TUI_LIGHT on/off', () => {
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it('honors HERMES_TUI_LIGHT on/off', async () => {
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const { detectLightMode } = await importThemeWithCleanEnv()
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expect(detectLightMode({ HERMES_TUI_LIGHT: '1' })).toBe(true)
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expect(detectLightMode({ HERMES_TUI_LIGHT: 'true' })).toBe(true)
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expect(detectLightMode({ HERMES_TUI_LIGHT: 'on' })).toBe(true)
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@ -48,7 +92,9 @@ describe('detectLightMode', () => {
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expect(detectLightMode({ HERMES_TUI_LIGHT: 'off' })).toBe(false)
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})
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it('sniffs COLORFGBG bg slots 7 and 15 as light (#11300)', () => {
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it('sniffs COLORFGBG bg slots 7 and 15 as light (#11300)', async () => {
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const { detectLightMode } = await importThemeWithCleanEnv()
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expect(detectLightMode({ COLORFGBG: '0;15' })).toBe(true)
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expect(detectLightMode({ COLORFGBG: '0;default;15' })).toBe(true)
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expect(detectLightMode({ COLORFGBG: '0;7' })).toBe(true)
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@ -56,38 +102,119 @@ describe('detectLightMode', () => {
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expect(detectLightMode({ COLORFGBG: '7;default;0' })).toBe(false)
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})
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it('lets HERMES_TUI_LIGHT=0 override a light COLORFGBG', () => {
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it('falls through on malformed COLORFGBG with empty/non-numeric trailing field', async () => {
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const { detectLightMode } = await importThemeWithCleanEnv()
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// `Number('')` is 0, so `'15;'` would have been read as bg=0
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// (authoritative dark) and incorrectly blocked TERM_PROGRAM.
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// The strict /^\d+$/ guard makes these fall through instead.
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const allowList = new Set(['Apple_Terminal'])
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expect(detectLightMode({ COLORFGBG: '15;', TERM_PROGRAM: 'Apple_Terminal' }, allowList)).toBe(true)
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expect(detectLightMode({ COLORFGBG: 'default;default', TERM_PROGRAM: 'Apple_Terminal' }, allowList)).toBe(true)
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// Without an allow-list match, fall-through still defaults to dark.
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expect(detectLightMode({ COLORFGBG: '15;' })).toBe(false)
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})
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it('lets HERMES_TUI_LIGHT=0 override a light COLORFGBG', async () => {
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const { detectLightMode } = await importThemeWithCleanEnv()
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expect(detectLightMode({ COLORFGBG: '0;15', HERMES_TUI_LIGHT: '0' })).toBe(false)
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})
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it('honors HERMES_TUI_THEME=light/dark as a symmetric explicit override', async () => {
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const { detectLightMode } = await importThemeWithCleanEnv()
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expect(detectLightMode({ HERMES_TUI_THEME: 'light' })).toBe(true)
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expect(detectLightMode({ HERMES_TUI_THEME: 'dark' })).toBe(false)
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expect(detectLightMode({ COLORFGBG: '0;15', HERMES_TUI_THEME: 'dark' })).toBe(false)
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expect(detectLightMode({ COLORFGBG: '15;0', HERMES_TUI_THEME: 'light' })).toBe(true)
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})
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it('uses HERMES_TUI_BACKGROUND luminance when COLORFGBG is missing', async () => {
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const { detectLightMode } = await importThemeWithCleanEnv()
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expect(detectLightMode({ HERMES_TUI_BACKGROUND: '#ffffff' })).toBe(true)
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expect(detectLightMode({ HERMES_TUI_BACKGROUND: '#000000' })).toBe(false)
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expect(detectLightMode({ HERMES_TUI_BACKGROUND: '#1e1e1e' })).toBe(false)
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// Three-char hex normalises like CSS.
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expect(detectLightMode({ HERMES_TUI_BACKGROUND: '#fff' })).toBe(true)
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// Garbage falls through to the default-dark path.
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expect(detectLightMode({ HERMES_TUI_BACKGROUND: 'not-a-colour' })).toBe(false)
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})
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it('rejects partially-invalid hex instead of silently truncating', async () => {
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const { detectLightMode } = await importThemeWithCleanEnv()
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// `parseInt('fffgff'.slice(2,4), 16)` would return 15 — the strict
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// regex must reject these inputs so they fall through to default-
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// dark instead of producing a false-positive light reading.
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expect(detectLightMode({ HERMES_TUI_BACKGROUND: '#fffgff' })).toBe(false)
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expect(detectLightMode({ HERMES_TUI_BACKGROUND: 'ffggff' })).toBe(false)
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expect(detectLightMode({ HERMES_TUI_BACKGROUND: '#xyz' })).toBe(false)
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// Wrong length also rejected (no implicit padding/truncation).
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expect(detectLightMode({ HERMES_TUI_BACKGROUND: '#fffff' })).toBe(false)
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expect(detectLightMode({ HERMES_TUI_BACKGROUND: '#fffffff' })).toBe(false)
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})
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it('treats COLORFGBG as authoritative when present so it dominates the TERM_PROGRAM allow-list', async () => {
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const { detectLightMode } = await importThemeWithCleanEnv()
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// Inject a light-default allow-list so the precedence test is
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// meaningful even though the production allow-list is empty.
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const allowList = new Set(['Apple_Terminal'])
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// Sanity: the allow-list alone WOULD turn this terminal light.
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expect(detectLightMode({ TERM_PROGRAM: 'Apple_Terminal' }, allowList)).toBe(true)
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// Dark COLORFGBG must beat the allow-list.
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expect(
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detectLightMode({ COLORFGBG: '15;0', TERM_PROGRAM: 'Apple_Terminal' }, allowList),
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).toBe(false)
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})
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})
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describe('fromSkin', () => {
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it('overrides banner colors', () => {
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// `fromSkin` closes over DEFAULT_THEME (which is env-derived), so we
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// must dynamic-import it after sterilizing env — otherwise an ambient
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// HERMES_TUI_THEME=light would flip the base palette and make these
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// assertions order-dependent on the developer's shell.
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it('overrides banner colors', async () => {
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const { fromSkin } = await importThemeWithCleanEnv()
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expect(fromSkin({ banner_title: '#FF0000' }, {}).color.gold).toBe('#FF0000')
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})
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it('preserves unset colors', () => {
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it('preserves unset colors', async () => {
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const { DEFAULT_THEME, fromSkin } = await importThemeWithCleanEnv()
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expect(fromSkin({ banner_title: '#FF0000' }, {}).color.amber).toBe(DEFAULT_THEME.color.amber)
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})
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it('overrides branding', () => {
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it('overrides branding', async () => {
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const { fromSkin } = await importThemeWithCleanEnv()
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const { brand } = fromSkin({}, { agent_name: 'TestBot', prompt_symbol: '$' })
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expect(brand.name).toBe('TestBot')
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expect(brand.prompt).toBe('$')
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})
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it('defaults for empty skin', () => {
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it('defaults for empty skin', async () => {
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const { DEFAULT_THEME, fromSkin } = await importThemeWithCleanEnv()
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expect(fromSkin({}, {}).color).toEqual(DEFAULT_THEME.color)
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expect(fromSkin({}, {}).brand.icon).toBe(DEFAULT_THEME.brand.icon)
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})
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it('passes banner logo/hero', () => {
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it('passes banner logo/hero', async () => {
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const { fromSkin } = await importThemeWithCleanEnv()
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expect(fromSkin({}, {}, 'LOGO', 'HERO').bannerLogo).toBe('LOGO')
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expect(fromSkin({}, {}, 'LOGO', 'HERO').bannerHero).toBe('HERO')
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})
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it('maps ui_ color keys + cascades to status', () => {
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it('maps ui_ color keys + cascades to status', async () => {
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const { fromSkin } = await importThemeWithCleanEnv()
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const { color } = fromSkin({ ui_ok: '#008000' }, {})
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expect(color.ok).toBe('#008000')
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expect(color.statusGood).toBe('#008000')
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})
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@ -179,23 +179,129 @@ export const LIGHT_THEME: Theme = {
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bannerHero: ''
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}
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// Pick light vs dark. Explicit `HERMES_TUI_LIGHT` wins; otherwise sniff
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// `COLORFGBG` (set by XFCE Terminal, rxvt, Terminal.app, etc.) — last field is the
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// background ANSI index; 7/15 are the "white" slots most light themes emit (#11300).
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export function detectLightMode(env: NodeJS.ProcessEnv = process.env): boolean {
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const explicit = (env.HERMES_TUI_LIGHT ?? '').trim().toLowerCase()
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const TRUE_RE = /^(?:1|true|yes|on)$/
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const FALSE_RE = /^(?:0|false|no|off)$/
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if (/^(?:1|true|yes|on)$/.test(explicit)) {
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// Reserved for future TERM_PROGRAM-based heuristics. Empty by default:
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// most modern terminals (Ghostty, Warp, iTerm2, Apple_Terminal) ship a
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// dark profile out of the box, so guessing wrong here is more annoying
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// than missing a light user — light users can always set
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// `HERMES_TUI_LIGHT=1` or `HERMES_TUI_THEME=light`.
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const LIGHT_DEFAULT_TERM_PROGRAMS = new Set<string>()
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// Best-effort RGB → luminance check. Currently only accepts a 3- or
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// 6-digit hex value (with or without a leading `#`); the env var name
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// `HERMES_TUI_BACKGROUND` is intentionally generic so a future OSC11
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// query helper can cache its answer there too, but additional formats
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// (rgb()/hsl()/named colours) would need explicit parsing here first.
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const LUMA_LIGHT_THRESHOLD = 0.6
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// Strict allow-list: parseInt(..., 16) silently truncates at the first
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// non-hex character (e.g. `fffgff` would parse as `fff` and yield a
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// false-positive "white" reading), so reject anything that doesn't match
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// the canonical 3- or 6-digit shape up front.
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const HEX_3_RE = /^[0-9a-f]{3}$/
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const HEX_6_RE = /^[0-9a-f]{6}$/
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function backgroundLuminance(raw: string): null | number {
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const v = raw.trim().toLowerCase()
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if (!v) {
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return null
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}
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const hex = v.startsWith('#') ? v.slice(1) : v
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const rgb = HEX_6_RE.test(hex)
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? [parseInt(hex.slice(0, 2), 16), parseInt(hex.slice(2, 4), 16), parseInt(hex.slice(4, 6), 16)]
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: HEX_3_RE.test(hex)
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? [parseInt(hex[0]! + hex[0]!, 16), parseInt(hex[1]! + hex[1]!, 16), parseInt(hex[2]! + hex[2]!, 16)]
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: null
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if (!rgb) {
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return null
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}
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// Rec. 709 luma — close enough for "is this background bright".
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return (0.2126 * rgb[0]! + 0.7152 * rgb[1]! + 0.0722 * rgb[2]!) / 255
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}
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// Pick light vs dark with ordered, explainable signals (#11300):
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//
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// 1. `HERMES_TUI_LIGHT` boolean — `1`/`true`/`yes`/`on` → light;
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// `0`/`false`/`no`/`off` → dark. Either explicit value wins
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// regardless of any later signal.
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// 2. `HERMES_TUI_THEME` named override — `light` / `dark` win over
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// every signal below.
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// 3. `HERMES_TUI_BACKGROUND` hex hint (3- or 6-digit) — luminance
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// ≥ LUMA_LIGHT_THRESHOLD → light.
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// 4. `COLORFGBG` last field — XFCE / rxvt / Terminal.app emit
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// slot 7 or 15 on light profiles; 0–15 ranges are otherwise
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// treated as authoritatively dark so the TERM_PROGRAM
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// allow-list below cannot override an explicit dark profile.
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// 5. `TERM_PROGRAM` light-default allow-list (currently empty).
|
||||
//
|
||||
// Anything we can't decide stays dark — the default Hermes palette
|
||||
// is the dark one.
|
||||
export function detectLightMode(
|
||||
env: NodeJS.ProcessEnv = process.env,
|
||||
// Injectable so tests can prove the COLORFGBG-over-TERM_PROGRAM
|
||||
// precedence rule even though the production allow-list is empty.
|
||||
lightDefaultTermPrograms: ReadonlySet<string> = LIGHT_DEFAULT_TERM_PROGRAMS,
|
||||
): boolean {
|
||||
const lightFlag = (env.HERMES_TUI_LIGHT ?? '').trim().toLowerCase()
|
||||
|
||||
if (TRUE_RE.test(lightFlag)) {
|
||||
return true
|
||||
}
|
||||
|
||||
if (/^(?:0|false|no|off)$/.test(explicit)) {
|
||||
if (FALSE_RE.test(lightFlag)) {
|
||||
return false
|
||||
}
|
||||
|
||||
const bg = Number((env.COLORFGBG ?? '').trim().split(';').at(-1))
|
||||
const themeFlag = (env.HERMES_TUI_THEME ?? '').trim().toLowerCase()
|
||||
|
||||
return bg === 7 || bg === 15
|
||||
if (themeFlag === 'light') {
|
||||
return true
|
||||
}
|
||||
|
||||
if (themeFlag === 'dark') {
|
||||
return false
|
||||
}
|
||||
|
||||
const bgHint = backgroundLuminance(env.HERMES_TUI_BACKGROUND ?? '')
|
||||
|
||||
if (bgHint !== null) {
|
||||
return bgHint >= LUMA_LIGHT_THRESHOLD
|
||||
}
|
||||
|
||||
const colorfgbg = (env.COLORFGBG ?? '').trim()
|
||||
|
||||
if (colorfgbg) {
|
||||
// Validate as a decimal integer before coercing — `Number('')` is 0,
|
||||
// so a malformed `COLORFGBG='15;'` would otherwise look like an
|
||||
// authoritative dark slot and incorrectly block the TERM_PROGRAM
|
||||
// allow-list. Anything that isn't pure digits falls through.
|
||||
const lastField = colorfgbg.split(';').at(-1) ?? ''
|
||||
|
||||
if (/^\d+$/.test(lastField)) {
|
||||
const bg = Number(lastField)
|
||||
|
||||
if (bg === 7 || bg === 15) {
|
||||
return true
|
||||
}
|
||||
|
||||
// Slots 0–6 and 8–14 are the dark half of the 0–15 ANSI range.
|
||||
// When COLORFGBG is set we trust it as authoritative — a non-light
|
||||
// value here shouldn't get overridden by the TERM_PROGRAM allow-list.
|
||||
if (bg >= 0 && bg < 16) {
|
||||
return false
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
const termProgram = (env.TERM_PROGRAM ?? '').trim()
|
||||
|
||||
return lightDefaultTermPrograms.has(termProgram)
|
||||
}
|
||||
|
||||
export const DEFAULT_THEME: Theme = detectLightMode() ? LIGHT_THEME : DARK_THEME
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue