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An Os.* namespace, Go-flavored and game-scoped, for the environment *around* the game: the command line, environment variables, standard streams, process exit, the host platform, and the per-user known folders a game writes into. Rounds the bare System.* builtins (arg/getenv/exit) into one coherent surface. - args / arg_count / arg the argument vector (args() -> []string) - env / env_or / has_env read env vars (null-safe via env_or) - set_env / unset_env mutate this process's environment - exit(code) terminate with a status code - platform() / arch() host facts (uname sysname/machine) - stdout_write / stderr_write raw writes to the standard streams - save_dir / config_dir / cache_dir / temp_dir per-user known folders Pure libc over NUL-terminated strings; C-free, no new runtime. arg_count/arg/ exit stay light (no prelude) as thin aliases of the existing intrinsics; the rest share one Os runtime prelude emitted on demand (g_uses_osrt). platform() is portable (uname system name is field 0 on every Unix); arch() and the known-folder layout follow the macOS/BSD conventions — the fully supported native target today. Linux/Windows/wasm folder resolution and a target-aware arch() are documented follow-ups. - examples/library/os.ludic: asserts the invariants that hold regardless of host — env round-trip, env_or fallback, unset, args()==arg_count(), non-empty platform/arch and known dirs. Wired into `x test` (now 54 passed). - docs: a new Os section + 17 per-symbol pages; inventory updated; every fence passes check-docs (--fmt) and the site builds via docgen. - seed regenerated; `x bootstrap-cfree` fixpoint holds. Closes #21 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
26 lines
561 B
Markdown
26 lines
561 B
Markdown
---
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id: os-arg
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name: Os.arg
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category: os
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kind: namespace-method
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tokens: Os.arg
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sig: Os.arg(i) -> string
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tip: The i-th command-line argument.
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order: 3
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ns: Os
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member: arg
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---
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The argument at index <code>i</code>. Index <code>0</code> is the program path; <code>1</code> onward are the launch arguments. Reading past <a href="os-arg_count"><code>arg_count()</code></a> is out of bounds.
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Parameters:
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- `i` — the argument index (0 = the program path)
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```ludic
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program Arg {
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entry {
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let prog = Os.arg(0) # the program path
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print(len(prog))
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}
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}
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```
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