Function resolve_phpstan

src/phpstan.rs:69–84

Attempt to resolve the PHPStan binary from configuration and the workspace environment. Resolution rules: - Config value `Some("")` (empty string) → disabled (`None`). - Config value `Some(cmd)` → use `cmd` as-is (user override). - Config value `None` → auto-detect: try ` /phpstan` under the workspace root, then search `$PATH`.

(
    workspace_root: Option<&Path>,
    config: &PhpStanConfig,
    bin_dir: Option<&str>,
)

/// - Config value `None` → auto-detect: try `<bin_dir>/phpstan` under
///   the workspace root, then search `$PATH`.
pub(crate) fn resolve_phpstan(
    workspace_root: Option<&Path>,
    config: &PhpStanConfig,
    bin_dir: Option<&str>,
) -> Option<ResolvedPhpStan> {
    match config.command.as_deref() {
        // Explicitly disabled.
        Some("") => None,
        // User-provided command.
        Some(cmd) => Some(ResolvedPhpStan {
            path: PathBuf::from(cmd),
        }),
        // Auto-detect.
        None => auto_detect(workspace_root, bin_dir),
    }
}

/// Auto-detect PHPStan by checking `<bin_dir>/phpstan` then `$PATH`.
fn auto_detect(workspace_root: Option<&Path>, bin_dir: Option<&str>) -> Option<ResolvedPhpStan> {