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# AGENTS.md
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## What this is
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SvelteKit 5 (runes mode) static site that assembles Steam launch commands from
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composable "program classes" (gamescope, MangoHud, Proton, obs-gamecapture,
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gamemode). User flips toggles in a tabbed UI; the app renders one flat launch
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command string like:
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```
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gamescope -f -- %command% mangohud waitforexecandrun %command%
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```
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Rendered by adapter-static (`prerender = true` in `src/routes/+page.ts`).
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## Core model (`src/lib/`)
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- `meow.ts` — the engine. `ArgEvaluatable` interface (`enabled()`, `envs()`,
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`binary()`, `prefix()`, `suffix()`, `priority()`, `arguments()`); `ArgEval`
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evaluates components: filter `enabled()`, sort by `priority()` (lowest =
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outermost wrapper), envs as `VAR=VAL` space-joined, each program rendered
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`prefix binary args suffix` (empty parts dropped), args sorted by `prio` and
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rendered `arg val` (bare `arg` when val empty), then `%command%` appended.
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- `programs.ts` — data types + `Program` class implementing `ArgEvaluatable`
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from a `ProgramConfig`. Key fields: `enabled`, `name`, `binary`, `prefix`,
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`suffix`, `priority`, `envs`, `args`, `options` (toggleable sub-flags),
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`envSeparators` (per-var merge separators), option `conflicts` (see below).
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- `presets.ts` — re-export index only; real factories live per-program in
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`src/lib/preset/` (see file map).
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- `preset/helpers.ts` — builders shared by presets: `envToggle(label, env,
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val, category?)`, `group(program, labels)` (pairwise conflict keys).
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(Mutually-exclusive flag choices like `-F` filter use ONE option with an
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`args[].values` dropdown — do NOT reintroduce one-option-per-value.)
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### Semantics to keep in mind
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- Env vars with the same name merge into ONE var: values dedupe, joined by the
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var's separator from `envSeparators` (default `,`).
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- `conflicts` keys are `'programname'` (program-level) or
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`'program:Option label'` (option-level). Only enabled vs enabled conflict;
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conflicts are displayed as a non-blocking warning banner.
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- Env merge destructuring: `var` is a reserved word in TS — use
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`[varName, vals]` in destructures.
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- Args are space-separated (`-W 1920`), never `arg=val`.
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## File map
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| file | role |
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| ---------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
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| `src/lib/meow.ts` | evaluation engine (see above) |
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| `src/lib/programs.ts` | types + `Program` adapter + `findConflicts()` |
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| `src/lib/presets.ts` | re-exports the eight preset factories |
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| `src/lib/preset/helpers.ts` | shared option builders |
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| `src/lib/preset/gamescope.ts` | gamescope args (fullscreen, filter/scale dropdowns, HDR, VR, …) |
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| `src/lib/preset/proton-ge.ts` | GloriousEggroll Proton env toggles |
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| `src/lib/preset/proton-cachyos.ts` | CachyOS Proton env toggles (largest set) |
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| `src/lib/preset/obs.ts` | obs-gamecapture CLI |
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| `src/lib/preset/gamemode.ts` | `gamemoderun` wrapper (priority 5 = outermost) |
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| `src/lib/preset/mangohud.ts` | MANGOHUD env options + `MANGOHUD_CONFIG` separator merge |
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| `src/lib/preset/mesa.ts` | Mesa Vulkan layers env toggles (anti-lag, overlay layer, fps-monitor) |
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| `src/lib/preset/prime.ts` | `prime-run` wrapper for NVIDIA PRIME offload |
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| `src/lib/ProgramForm.svelte` | per-program editor: enabled checkbox, options list, Advanced `<details>` (name/binary/prefix/suffix/priority, env vars, args, env separators) |
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| `src/lib/decode.ts` | `applyCommand(cmd, programs)` — enable options/programs a pasted command references (only ever enables, never disables) |
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| `src/routes/+page.svelte` | tabs + `pre.result` command preview + conflict banner; localStorage persistence; decode textarea |
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| `launch_args_env_vars.md` | reference: gamescope args, Proton env-var tables, OBS, gamemode |
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| `steam-tinker-launcher.md` | reference: STL v14 docs (gamescope CLI catalog §3.1–3.6, mangohud, proton, dxvk, wine) |
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## Conventions
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- New programs are preset factory functions in `src/lib/preset/<name>.ts`
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returning a `ProgramConfig`, re-exported from `presets.ts`, imported into
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`+page.svelte`'s `programs` array.
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- Every option carries a `category: string`; ProgramForm groups options under
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category headings (keep categories consistent within a preset).
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- Every option should also carry a `desc: string`; it appears as a hover
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tooltip (1 s delay, CSS-only) next to the option row.
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- Default new presets to `enabled: false` so the default output stays stable.
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- Preset files ≤ ~140 lines; split if they grow (that's why the directory
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exists). Shared builders go in `helpers.ts`.
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- `+page.svelte` uses PURE TAB indentation — never build edit oldText with
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spaces.
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- Mutual exclusivity is expressed via `conflicts` (options) or `group()`
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(helpers), never via extra app state.
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- `user-select: none` on tabs/labels to stop double-click selection; inputs and
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`pre.result` stay selectable.
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## Adding options & programs (agent playbook)
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Every task in this repo ends with the verification loop below; a change is not
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done until all three pass.
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### Add an option to an existing program
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1. Edit `src/lib/preset/<name>.ts` — the program's factory, inside
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`options: [...]`. Mine the flag/env catalogs from `launch_args_env_vars.md`
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and `steam-tinker-launcher.md`.
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2. Pick the builder (from `./helpers`):
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- Env toggle (checkbox sets `VAR=1`):
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`envToggle('Label', 'ENV_VAR', '1', 'Category')` — pass a custom value as
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the 3rd arg for non-`1` values.
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- Flag with a value (gets an editable input in the UI while enabled):
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```ts
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{ label: 'Mouse sensitivity', enabled: false, args: [{ arg: '-s', val: '1.0', prio: 0 }], category: 'Window' }
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```
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- Flag with a fixed value set (gets a `<select>` dropdown instead of a
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text input): add `values: ['auto', 'drm', 'wayland']` to the arg.
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- Flag whose value must match a regex (input turns red + banner error
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while invalid): add `pattern: NUM` or `pattern: NUM_DEC` (exported from
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`./helpers`) or a custom regex source string.
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- Bare flag: same shape with `val: ''` (checkbox only, no input).
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- Mutually exclusive flag with a fixed value set (e.g. `-F fsr` vs
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`-F nis`): ONE option with `values` on the arg:
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`{ label: 'Filter', enabled: false, args: [{ arg: '-F', val: 'fsr', prio: 0, values: ['none', 'linear', 'fsr', 'nis'] }], category: 'Filter' }`.
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Do NOT create one option per value.
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3. `category` is required — reuse an existing one from that preset or add a new
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one (it becomes a tab). Keep categories consistent within a preset.
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4. Mutual exclusivity: `conflicts: ['other-program']` or
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`conflicts: ['same-program:Other option label']`; `group()` generates
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these automatically.
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5. Presets only supply defaults — the form binds arg `val` to an input while
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the option is enabled, so users can override values.
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### Add a new program
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1. Create `src/lib/preset/<name>.ts` exporting
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`export function <name>(): ProgramConfig` (model on
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`src/lib/preset/obs.ts` — the smallest real example).
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2. Required config: `name`, `enabled` (default `false` so output stays stable),
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`binary`, `prefix` (wrapper like `'gamemoderun'`), `suffix`
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(`'waitforexecandrun'` for proton, `'--'` for gamescope-style), `priority`,
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`envs: []`, `args: []`, `options: [...]`.
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3. Re-export: add `export { <name> } from './preset/<name>';` to
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`src/lib/presets.ts`.
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4. Import it in `src/routes/+page.svelte` and append to the
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`programs = $state([...])` array.
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5. Keep the file ≤ ~140 lines; use `envToggle()`/`group()` for builders and
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repetitive options.
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Priority semantics: components sort ascending by `priority()` — the outermost
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wrapper has the LOWEST number (gamemoderun=5, gamescope=10, proton=20,
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mangohud=30).
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## Verification (mandatory before yielding)
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```bash
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pnpm exec prettier --write <edited files> # lint runs prettier --check
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pnpm check # svelte-check — authoritative type check
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pnpm lint # prettier --check + eslint
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pnpm build # adapter-static build
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```
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All four must pass. `pnpm check` is the authority — see the known quirk below.
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Known traps for agents:
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- **pi-lens/LSP diagnostics on `.svelte` files are stale all session** — they
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falsely report `enabled` / `category` / `envSeparators` as missing from
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`ProgramConfig` on every edit. They are noise: the fields verifiably exist in
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`programs.ts`. Do NOT chase them; rely on `pnpm check` (returns 0 errors
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every time). The `.ts` files' diagnostics are accurate.
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- `+page.svelte` uses pure tabs — edit `oldText` must use tabs, not spaces. If
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the edit tool reports content-drift, re-read the file verbatim before
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retrying.
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- This file (AGENTS.md) is auto-reformatted by prettier/markdownlint after
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edits — always re-read it before further edits; it also uses real em-dashes
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(`—`).
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- `var` is a reserved word in TS destructuring — use `[varName, vals]`.
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- A stale `vite dev` server can serve corrupted modules (missing exports).
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Fix: kill all `vite` processes and restart — never `pkill -f` with a pattern
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that also appears in your own command line (it kills your shell).
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- Do not add options the docs mark as per-user paths or STL-internal settings
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(Vortex/MO2/winetricks/Conty…); README.md is sv boilerplate, ignore it.
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Reference docs to mine for new options: `launch_args_env_vars.md` and
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`steam-tinker-launcher.md` (README.md is sv boilerplate, ignore it).
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