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|
use std::fmt;
use crate::{
error::{EntryError, PullError},
status::PullStatus,
};
use ansi_term::{Color, Style};
use chrono::prelude::*;
use feed_rs::{
model::{Entry as ChannelEntry, Feed as Channel},
parser,
};
use serde::{Deserialize, Serialize};
use url::Url;
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Feed {
// channel url
pub link: Url,
// channel data
entries: Vec<Entry>,
// channel meta
title: String,
html_link: String,
}
impl Feed {
pub fn new(link: Url) -> Self {
Self {
link,
entries: Vec::new(),
title: String::new(),
html_link: String::new(),
}
}
pub fn total_count(&self) -> usize {
self.entries.len()
}
pub fn last_updated(&self) -> DateTime<Utc> {
self.entries
.iter()
.map(|e| e.published)
.max()
.unwrap_or(DateTime::<Utc>::MIN_UTC)
}
pub fn unread_count(&self) -> usize {
self.entries.iter().filter(|e| e.unread).count()
}
fn update_title(&mut self, channel: &Channel) -> bool {
if let Some(t) = channel.title.as_ref() {
self.title = t.content.clone();
return true;
}
false
}
fn update_html_link(&mut self, channel: &Channel) -> bool {
// update html link
if let Some(l) = channel.links.first() {
self.html_link = l.href.clone();
return true;
}
false
}
pub fn entries(&self) -> &[Entry] {
self.entries.as_slice()
}
pub async fn pull(&mut self) -> Result<PullStatus, PullError> {
let content = reqwest::get(self.link.clone()).await?.bytes().await?;
let channel = parser::parse(&content[..])?;
// update title
if !self.update_title(&channel) {
return Err(PullError::TitleUpdate);
}
// update html link
if !self.update_html_link(&channel) {
return Err(PullError::LinkUpdate);
};
// fetch new entries
let (entries, errors): (Vec<_>, Vec<_>) = channel
.entries
.iter()
.map(|e| Entry::try_from(e, &self.link))
.partition(Result::is_ok);
// pull status
let title = self.title.clone();
let count = entries.len().saturating_sub(self.total_count());
let errors = errors.into_iter().map(Result::unwrap_err).collect();
let pull_status = PullStatus::new(title, count, errors);
// update entries
self.entries = entries.into_iter().map(Result::unwrap).collect();
self.entries.sort_by(|a, b| b.published.cmp(&a.published));
Ok(pull_status)
}
}
impl fmt::Display for Feed {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(
f,
"{} {} {}",
self.last_updated().format(crate::DATE_FMT),
Style::new().dimmed().paint(self.title.to_ascii_lowercase()),
Style::new()
.fg(Color::Cyan)
.paint(self.entries.len().to_string()),
)
}
}
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Entry {
pub title: String,
pub link: Url,
pub published: DateTime<Utc>,
pub unread: bool,
}
impl Entry {
fn try_from(e: &ChannelEntry, feed_url: &Url) -> Result<Self, EntryError> {
let title = e
.title
.as_ref()
.map(|t| t.content.clone())
.ok_or(EntryError::MissingTitle)?;
let raw_link = e
.links
.first()
.map(|l| l.href.clone())
.ok_or(EntryError::MissingLink)?;
let link = Url::parse(&raw_link)
.or_else(|_| feed_url.join(&raw_link))
.map_err(|_| EntryError::InvalidLink)?;
let published = e
.published
.or(e.updated)
.ok_or(EntryError::MissingPubDate)?;
Ok(Self {
title,
link,
published,
unread: true,
})
}
}
impl fmt::Display for Entry {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(
f,
"{} {} {}",
self.published.format(crate::DATE_FMT),
Style::new().dimmed().paint(self.title.to_ascii_lowercase()),
Style::new().fg(Color::Cyan).paint(
self.link
.as_str()
.trim_end_matches('/')
.trim_start_matches("http://www.")
.trim_start_matches("https://www.")
.trim_start_matches("https://")
.trim_start_matches("http://")
),
)
}
}
|
