agent-first-mail 0.1.0

Give your AI agent a mailbox it can actually work in — your mail pulled down into plain files it reads, triages, drafts, and files entirely on your machine, with nothing sent or changed on the real mailbox until you confirm.
Documentation 
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use crate::cli::PurgeAction;
use crate::error::{AppError, Result};

pub(super) enum ResolvedPurgeAction {
    Spam { older_than_days: u64 },
    Trash { older_than_days: u64 },
    Deleted { older_than_days: u64 },
    Discards { older_than_days: u64 },
}

pub(super) fn resolve_purge_action(
    action: Option<PurgeAction>,
    root_older_than_days: Option<u64>,
) -> Result<ResolvedPurgeAction> {
    match action {
        Some(PurgeAction::Spam { older_than_days }) => Ok(ResolvedPurgeAction::Spam {
            older_than_days: resolve_purge_older_than_days(root_older_than_days, older_than_days)?,
        }),
        Some(PurgeAction::Trash { older_than_days }) => Ok(ResolvedPurgeAction::Trash {
            older_than_days: resolve_purge_older_than_days(root_older_than_days, older_than_days)?,
        }),
        Some(PurgeAction::Deleted { older_than_days }) => Ok(ResolvedPurgeAction::Deleted {
            older_than_days: resolve_purge_older_than_days(root_older_than_days, older_than_days)?,
        }),
        None => Ok(ResolvedPurgeAction::Discards {
            older_than_days: root_older_than_days.unwrap_or(30),
        }),
    }
}

fn resolve_purge_older_than_days(root: Option<u64>, child: Option<u64>) -> Result<u64> {
    match (root, child) {
        (Some(_), Some(_)) => Err(AppError::new(
            "invalid_request",
            "--older-than-days cannot be specified both before and after the purge target",
        )),
        (Some(days), None) | (None, Some(days)) => Ok(days),
        (None, None) => Ok(30),
    }
}