mars-schema 0.20.5

Pure schema reader and editor for Mars agent packages
Documentation 
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//! Provider names, the hosts that supply skills Mars installs outside the dependency graph.
//!
//! A provider is the name a host program gives what it provides (`meridian`), and it is its own
//! namespace: separate from dependency keys, dependency-declared refs must opt in with
//! `[package] uses-providers`. Skills it provides are named `<skill>__<provider>`, so a ref's
//! validity depends only on the package, never on what a machine happens to have installed.

/// The provider-name grammar: `[a-z0-9][a-z0-9-]*`.
///
/// Excludes `__`, `@` and `=` so a provider name can never be confused with a skill name's
/// separator or the `mars provide` spec syntax.
pub fn is_provider_name(name: &str) -> bool {
    let mut chars = name.chars();
    match chars.next() {
        Some(first) if first.is_ascii_lowercase() || first.is_ascii_digit() => {}
        _ => return false,
    }
    chars.all(|c| c.is_ascii_lowercase() || c.is_ascii_digit() || c == '-')
}

/// The provider a skill name belongs to: the suffix after its last `__`.
///
/// Returns `None` for an unprefixed name (`notify`) and for a name whose suffix is not a provider
/// name (`notify__Not-Provider`), so an author cannot claim a provider ref by spelling alone.
pub fn provider_of(skill_name: &str) -> Option<&str> {
    let (stem, provider) = skill_name.rsplit_once("__")?;
    if stem.is_empty() || !is_provider_name(provider) {
        return None;
    }
    Some(provider)
}