himalaya 0.5.4

Command-line interface for email management
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use anyhow::{anyhow, Context, Error, Result};
use serde::Serialize;
use std::{borrow::Cow, convert::TryFrom};

use crate::{
    domain::msg::{Flag, Flags},
    ui::{Cell, Row, Table},
};

pub type RawEnvelope = imap::types::Fetch;

/// Representation of an envelope. An envelope gathers basic information related to a message. It
/// is mostly used for listings.
#[derive(Debug, Default, Serialize)]
pub struct Envelope<'a> {
    /// The sequence number of the message.
    ///
    /// [RFC3501]: https://datatracker.ietf.org/doc/html/rfc3501#section-2.3.1.2
    pub id: u32,

    /// The flags attached to the message.
    pub flags: Flags,

    /// The subject of the message.
    pub subject: Cow<'a, str>,

    /// The sender of the message.
    pub sender: String,

    /// The internal date of the message.
    ///
    /// [RFC3501]: https://datatracker.ietf.org/doc/html/rfc3501#section-2.3.3
    pub date: Option<String>,
}

impl<'a> TryFrom<&'a RawEnvelope> for Envelope<'a> {
    type Error = Error;

    fn try_from(fetch: &'a RawEnvelope) -> Result<Envelope> {
        let envelope = fetch
            .envelope()
            .ok_or_else(|| anyhow!("cannot get envelope of message {}", fetch.message))?;

        // Get the sequence number
        let id = fetch.message;

        // Get the flags
        let flags = Flags::try_from(fetch.flags())?;

        // Get the subject
        let subject: Cow<str> = envelope
            .subject
            .as_ref()
            .map(|subj| {
                rfc2047_decoder::decode(subj).context(format!(
                    "cannot decode subject of message {}",
                    fetch.message
                ))
            })
            .unwrap_or_else(|| Ok(String::default()))?
            .into();

        // Get the sender
        let sender = envelope
            .sender
            .as_ref()
            .and_then(|addrs| addrs.get(0))
            .or_else(|| envelope.from.as_ref().and_then(|addrs| addrs.get(0)))
            .ok_or_else(|| anyhow!("cannot get sender of message {}", fetch.message))?;
        let sender = if let Some(ref name) = sender.name {
            rfc2047_decoder::decode(&name.to_vec()).context(format!(
                "cannot decode sender's name of message {}",
                fetch.message,
            ))?
        } else {
            let mbox = sender
                .mailbox
                .as_ref()
                .ok_or_else(|| anyhow!("cannot get sender's mailbox of message {}", fetch.message))
                .and_then(|mbox| {
                    rfc2047_decoder::decode(&mbox.to_vec()).context(format!(
                        "cannot decode sender's mailbox of message {}",
                        fetch.message,
                    ))
                })?;
            let host = sender
                .host
                .as_ref()
                .ok_or_else(|| anyhow!("cannot get sender's host of message {}", fetch.message))
                .and_then(|host| {
                    rfc2047_decoder::decode(&host.to_vec()).context(format!(
                        "cannot decode sender's host of message {}",
                        fetch.message,
                    ))
                })?;
            format!("{}@{}", mbox, host)
        };

        // Get the internal date
        let date = fetch
            .internal_date()
            .map(|date| date.naive_local().to_string());

        Ok(Self {
            id,
            flags,
            subject,
            sender,
            date,
        })
    }
}

impl<'a> Table for Envelope<'a> {
    fn head() -> Row {
        Row::new()
            .cell(Cell::new("ID").bold().underline().white())
            .cell(Cell::new("FLAGS").bold().underline().white())
            .cell(Cell::new("SUBJECT").shrinkable().bold().underline().white())
            .cell(Cell::new("SENDER").bold().underline().white())
            .cell(Cell::new("DATE").bold().underline().white())
    }

    fn row(&self) -> Row {
        let id = self.id.to_string();
        let flags = self.flags.to_symbols_string();
        let unseen = !self.flags.contains(&Flag::Seen);
        let subject = &self.subject;
        let sender = &self.sender;
        let date = self.date.as_deref().unwrap_or_default();
        Row::new()
            .cell(Cell::new(id).bold_if(unseen).red())
            .cell(Cell::new(flags).bold_if(unseen).white())
            .cell(Cell::new(subject).shrinkable().bold_if(unseen).green())
            .cell(Cell::new(sender).bold_if(unseen).blue())
            .cell(Cell::new(date).bold_if(unseen).yellow())
    }
}