Method execute

atomic-cli/src/commands/update.rs:536–577

Pure business logic. Returns an `UpdateOutcome`, or a `CliError::RemoteError` for network / GitHub failures. Caller decides exit code and presentation.

(&self)

    /// `CliError::RemoteError` for network / GitHub failures. Caller
    /// decides exit code and presentation.
    async fn execute(&self) -> CliResult<UpdateOutcome> {
        let env = StdEnv;
        let source = match std::env::current_exe() {
            Ok(p) => detect_source(&p, &env),
            Err(_) => InstallSource::Unknown,
        };

        let current = env!("CARGO_PKG_VERSION").to_string();
        let latest_tag = fetch_latest(&env).await?;
        let latest = latest_tag
            .strip_prefix('v')
            .unwrap_or(&latest_tag)
            .to_string();

        Ok(match (parse_version(&current), parse_version(&latest)) {
            (Some(c), Some(l)) if c == l => UpdateOutcome::UpToDate { current, source },
            (Some(c), Some(l)) if c > l => UpdateOutcome::AheadOfRelease {
                current,
                latest,
                source,
            },
            (Some(_), Some(_)) => {
                let drift = match &source {
                    InstallSource::OfficialInstaller {
                        recorded_version, ..
                    } if recorded_version != &current => Some(recorded_version.clone()),
                    _ => None,
                };
                UpdateOutcome::Outdated {
                    current,
                    latest,
                    source,
                    drift_manifest_version: drift,
                }
            }
            _ => UpdateOutcome::UnknownVersion {
                current,
                latest,
                source,
            },
        })
    }
}

// Tests — inline because atomic-cli is a binary crate with no lib.rs,