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use std::collections::HashSet;
use std::env;
use std::fs::{self, DirBuilder, File};
use std::io::{self, BufReader, Read, Write};
use std::num::ParseIntError;
use std::path::PathBuf;
use reqwest;
use rss::Channel;
pub fn trim_extension(filename: &str) -> Option<String> {
let name = String::from(filename);
match name.rfind('.') {
Some(index) => Some(String::from(&name[0..index])),
None => None,
}
}
pub fn find_extension(input: &str) -> Option<&str> {
let tmp = String::from(input);
if tmp.ends_with(".mp3") {
Some(".mp3")
} else if tmp.ends_with(".m4a") {
Some(".m4a")
} else if tmp.ends_with(".wav") {
Some(".wav")
} else if tmp.ends_with(".ogg") {
Some(".ogg")
} else if tmp.ends_with(".opus") {
Some(".opus")
} else {
None
}
}
pub fn create_directories() -> Result<(), String> {
let mut path = get_podcast_dir();
path.push(".rss");
if let Err(err) = DirBuilder::new().recursive(true).create(&path) {
return Err(format!(
"Couldn't create directory: {}\nReason: {}",
path.to_str().unwrap(),
err
));
}
Ok(())
}
pub fn already_downloaded(dir: &str) -> Result<HashSet<String>, io::Error> {
let mut result = HashSet::new();
let mut path = get_podcast_dir();
path.push(dir);
let entries = fs::read_dir(path)?;
for entry in entries {
let entry = entry?;
match entry.file_name().into_string() {
Ok(val) => {
let name = String::from(val);
let index = name.find('.').unwrap();
result.insert(String::from(&name[0..index]));
}
Err(_) => {
println!(
"OsString: {:?} couldn't be converted to String",
entry.file_name()
);
}
}
}
Ok(result)
}
pub fn get_podcast_dir() -> PathBuf {
match env::var_os("PODCAST") {
Some(val) => PathBuf::from(val),
None => {
let mut path = env::home_dir().expect("Couldn't find your home directory");
path.push("Podcasts");
path
}
}
}
pub fn get_sub_file() -> PathBuf {
let mut path = get_podcast_dir();
path.push(".subscriptions");
path
}
pub fn get_xml_dir() -> PathBuf {
let mut path = get_podcast_dir();
path.push(".rss");
path
}
pub fn download_rss_feed(url: &str) -> Result<Channel, String> {
let mut path = get_podcast_dir();
path.push(".rss");
DirBuilder::new().recursive(true).create(&path).unwrap();
let mut resp = reqwest::get(url).unwrap();
let mut content: Vec<u8> = Vec::new();
resp.read_to_end(&mut content).unwrap();
let channel = Channel::read_from(BufReader::new(&content[..])).unwrap();
let mut filename = String::from(channel.title());
filename.push_str(".xml");
path.push(filename);
let mut file = File::create(&path).unwrap();
file.write_all(&content).unwrap();
Ok(channel)
}
pub fn parse_download_episodes(e_search: &str) -> Result<Vec<usize>, ParseIntError> {
let input = String::from(e_search);
let mut ranges = Vec::<(usize, usize)>::new();
let mut elements = Vec::<usize>::new();
let comma_separated: Vec<&str> = input.split(',').collect();
for elem in comma_separated {
let temp = String::from(elem);
if temp.contains("-") {
let range: Vec<usize> = elem.split('-')
.map(|i| i.parse::<usize>().unwrap())
.collect();
ranges.push((range[0], range[1]));
} else {
elements.push(elem.parse::<usize>()?);
}
}
for range in ranges {
// Add 1 to upper range to include given episode in the download
for num in range.0..range.1 + 1 {
elements.push(num);
}
}
elements.dedup();
Ok(elements)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_find_extension_mp3() {
assert_eq!(find_extension("test.mp3"), Some(".mp3"))
}
#[test]
fn test_find_extension_m4a() {
assert_eq!(find_extension("test.m4a"), Some(".m4a"))
}
#[test]
fn test_find_extension_wav() {
assert_eq!(find_extension("test.wav"), Some(".wav"))
}
#[test]
fn test_find_extension_ogg() {
assert_eq!(find_extension("test.ogg"), Some(".ogg"))
}
#[test]
fn test_find_extension_opus() {
assert_eq!(find_extension("test.opus"), Some(".opus"))
}
#[test]
fn test_find_extension_invalid() {
assert_eq!(find_extension("test.taco"), None)
}
#[test]
fn test_trim_extension() {
assert_eq!(trim_extension("test.taco"), Some(String::from("test")))
}
#[test]
fn test_trim_extension_invalid() {
assert_eq!(trim_extension("test"), None)
}
}
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