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mod channel;
mod config;
mod retrieve;
use std::{fs::File, future, io::{BufRead, BufReader}, path::{Path, PathBuf}};
use anyhow::anyhow;
use clap::Parser;
use futures::{StreamExt, executor::block_on};
use rss::{Channel, Item, Source};
use crate::{channel::make_new_empty_channel, config::Config, retrieve::retrieve};
#[derive(Parser, Debug)]
#[command(version, about, long_about = None)]
struct Args {
/// Path to the config file. If blank, searches default config locations.
#[arg(short = 'c', long = "config", default_value = "")]
config_file: String,
}
fn main() {
let args = Args::parse();
let (urls, config) = load_config(&args.config_file).unwrap();
let channel = generate_channel(urls, config);
let _ = channel.pretty_write_to(std::io::stdout(), b' ', 4).unwrap();
}
fn load_config(config_file_arg: &str) -> anyhow::Result<(Vec<String>, Config)> {
let (config, config_path) = match config_file_arg {
"" => Config::find_config().ok_or_else(||
anyhow!("Failed to find config. Paths searched: {:#?}", config::default_config_file_locations())),
path => Config::parse_config_file_at_path(path).map(|config| (config, String::from(path))).map_err(|err|
anyhow!("Failed to parse config at {}. Error: {}", path, err)),
}?;
let subscriptions_path: PathBuf = config.subscriptions_path.as_ref()
.map(|p| Path::new(&p).to_path_buf())
.unwrap_or_else(
|| Path::new(&config_path)
.parent()
.unwrap_or_else(|| Path::new("/"))
.join("subscriptions.txt"));
let urls: Vec<String> = if subscriptions_path.is_file() {
let subscriptions_file = File::open(subscriptions_path)?;
BufReader::new(subscriptions_file).lines()
.filter(|line| line.is_err() || line.as_ref().is_ok_and(|line|
line.trim().len() > 0 && !line.trim().starts_with("#")))
.collect::<Result<Vec<String>, std::io::Error>>()?
} else {
Vec::new()
};
Ok((urls, config))
}
fn generate_channel(urls: Vec<String>, config: Config) -> Channel {
let mut channel = make_new_empty_channel(config);
block_on(async {
retrieve(urls.iter().map(AsRef::as_ref)).await.for_each(|c| {
channel.items.append(&mut items_with_source(c));
future::ready(())
}).await;
});
channel
}
fn items_with_source(c: Channel) -> Vec<Item> {
let source = Source {
url: c.link.clone(),
title: Some(c.title.clone()),
};
c.into_items().into_iter()
.map(|mut item| { item.source = Some(source.clone()); item })
.collect()
}
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