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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>
641 B
641 B
| id | name | category | kind | tokens | sig | tip | order | ns | member |
|---|---|---|---|---|---|---|---|---|---|
| os-env_or | Os.env_or | os | namespace-method | Os.env_or | Os.env_or(name, fallback) -> string | Read an environment variable, or a fallback. | 5 | Os | env_or |
Reads an environment variable, returning fallback when it is not set — the null-safe way to read optional configuration. The result is always non-null, so it is safe to use directly.
Parameters:
name— the variable namefallback— the value to use when the variable is unset
program EnvOr {
entry {
let assets = Os.env_or("LUDIC_ASSETS", "assets/")
print(len(assets))
}
}