f4-dir-per-channel (#21)

Closes kemitix/podal#4

Reviewed-on: #21
Co-authored-by: Paul Campbell <pcampbell@kemitix.net>
Co-committed-by: Paul Campbell <pcampbell@kemitix.net>

.tool-versions

@@ -0,0 +1 @@
+yt-dlp     latest

src/feed/find.rs

@@ -1,9 +1,11 @@
 use crate::prelude::*;
 
-use crate::network::NetworkEnv;
+use crate::network::{NetUrl, NetworkEnv};
 
-pub fn find(site: &str, channel_name: &str, e: &NetworkEnv) -> Result<String> {
+use super::ChannelName;
-    if let Some(channel_prefix) = channel_name.chars().next() {
+
+pub fn find(site: &str, channel_name: &ChannelName, e: &NetworkEnv) -> Result<NetUrl> {
+    if let Some(channel_prefix) = channel_name.0.chars().next() {
         if channel_prefix != '@' {
             return Err(anyhow!(
                 "Channel Name must begin with an '@': {}",
@@ -11,19 +13,21 @@ pub fn find(site: &str, channel_name: &str, e: &NetworkEnv) -> Result<String> {
             ));
         }
     }
-    let channel_url = format!("{}{}", site, channel_name);
+    let channel_url = NetUrl(format!("{}{}", site, channel_name));
     let response = (e.fetch_as_text)(&channel_url)
         .context(format!("Fetching channel to find RSS: {}", channel_url))?;
     let rss_selector = scraper::Selector::parse("link[title='RSS']")
         .map_err(|e| anyhow!("Invalid selector: {}", e))?;
-    let rss_url = scraper::Html::parse_document(&response)
+    let rss_url = NetUrl(
-        .select(&rss_selector)
+        scraper::Html::parse_document(&response)
-        .next()
+            .select(&rss_selector)
-        .context("No RSS link found")?
+            .next()
-        .value()
+            .context("No RSS link found")?
-        .attr("href")
+            .value()
-        .context("No href attribute found in RSS link")?
+            .attr("href")
-        .to_string();
+            .context("No href attribute found in RSS link")?
+            .to_string(),
+    );
     Ok(rss_url)
 }
 
@@ -42,16 +46,16 @@ mod tests {
         //given
         let network_env = NetworkEnv {
             fetch_as_text: mock_fetch_as_text_with_rss_url(HashMap::from([(
-                "site@channel",
+                NetUrl::from("site@channel"),
                 "the-rss-url",
             )])),
             fetch_as_bytes: stub_network_fetch_as_bytes(),
             download_as_mp3: stub_network_download_as_mp3(),
         };
         //when
-        let result = find("site", "@channel", &network_env)?;
+        let result = find("site", &ChannelName::from("@channel"), &network_env)?;
         //then
-        assert_eq!(result, "the-rss-url");
+        assert_eq!(result, NetUrl::from("the-rss-url"));
         Ok(())
     }
 
@@ -64,7 +68,11 @@ mod tests {
             download_as_mp3: stub_network_download_as_mp3(),
         };
         //when
-        let result = find("site", "invalid-channel-name", &network_env);
+        let result = find(
+            "site",
+            &ChannelName::from("invalid-channel-name"),
+            &network_env,
+        );
         //then
         assert!(result.is_err());
         Ok(())

src/feed/mod.rs

@@ -1,14 +1,27 @@
 use crate::prelude::*;
 
-use crate::network::NetworkEnv;
+use crate::network::{NetUrl, NetworkEnv};
 use atom_syndication::Feed;
 
 mod find;
 
 pub use find::find;
 
-pub fn get(url: &str, e: &NetworkEnv) -> Result<Feed> {
+pub fn get(url: &NetUrl, e: &NetworkEnv) -> Result<Feed> {
     let content = (e.fetch_as_bytes)(url).context(format!("Fetching feed: {}", url))?;
     let channel = Feed::read_from(&content[..]).context("Could not parse RSS feed")?;
     Ok(channel)
 }
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct ChannelName(pub String);
+impl ChannelName {
+    pub fn from(channel_name: &str) -> Self {
+        Self(channel_name.to_string())
+    }
+}
+impl std::fmt::Display for ChannelName {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.0.as_str())
+    }
+}

src/file/read.rs

@@ -1,15 +1,15 @@
-use crate::prelude::*;
+use crate::{feed::ChannelName, prelude::*};
 
 use crate::file::FileEnv;
 use std::io::{BufRead, BufReader};
 
-pub fn lines_from(file_name: &str, e: &FileEnv) -> Result<Vec<String>> {
+pub fn lines_from(file_name: &str, e: &FileEnv) -> Result<Vec<ChannelName>> {
     let file = (e.open)(file_name).context(format!("Opening file: {file_name}"))?;
     let reader = BufReader::new(file);
     let mut lines = vec![];
     for line in reader.lines().flatten() {
         if line.starts_with('@') {
-            lines.push(line);
+            lines.push(ChannelName(line));
         }
     }
     Ok(lines)
@@ -41,7 +41,13 @@ mod tests {
 
         //then
         drop(dir);
-        assert_eq!(result, ["@sub1", "@sub2", "@sub3"]);
+        assert_eq!(
+            result,
+            ["@sub1", "@sub2", "@sub3"]
+                .into_iter()
+                .map(ChannelName::from)
+                .collect::<Vec<ChannelName>>()
+        );
         Ok(())
     }
 
@@ -64,7 +70,13 @@ mod tests {
 
         //then
         drop(dir);
-        assert_eq!(result, ["@sub1", "@sub2", "@sub3"]);
+        assert_eq!(
+            result,
+            ["@sub1", "@sub2", "@sub3"]
+                .into_iter()
+                .map(ChannelName::from)
+                .collect::<Vec<ChannelName>>()
+        );
         Ok(())
     }
 
@@ -87,7 +99,13 @@ mod tests {
 
         //then
         drop(dir);
-        assert_eq!(result, ["@sub1", "@sub3"]);
+        assert_eq!(
+            result,
+            ["@sub1", "@sub3"]
+                .into_iter()
+                .map(ChannelName::from)
+                .collect::<Vec<ChannelName>>()
+        );
         Ok(())
     }
 }

src/lib.rs

@@ -14,6 +14,8 @@ mod test_utils;
 use file::FileEnv;
 use network::NetworkEnv;
 
+use crate::network::NetUrl;
+
 pub struct Env {
     pub network: NetworkEnv,
     pub file: FileEnv,
@@ -32,7 +34,8 @@ pub fn run(site: &str, a: &Args, e: Env) -> Result<()> {
             if let Some(link) = entry.links().first() {
                 if !history::find(link, &a.history, &e.file).context("Finding history")? {
                     println!("Downloading {}: {}", &channel_name, entry.title().as_str());
-                    (e.network.download_as_mp3)(&link.href).context("Downloading as MP3")?;
+                    (e.network.download_as_mp3)(&NetUrl(link.href.clone()), &channel_name)
+                        .context("Downloading as MP3")?;
                     history::add(link, &a.history, &e.file).context("Adding to history")?;
                 }
             }
@@ -60,7 +63,7 @@ mod tests {
         //given
 
         let site = "http://example.com/";
-        let (tx, rx) = mpsc::channel::<String>(); // channel to recieve notice of downloaded urls
+        let (tx, rx) = mpsc::channel::<NetUrl>(); // channel to recieve notice of downloaded urls
 
         // two channels in subscriptions.txt
         let subs_file_name = "subs";
@@ -84,16 +87,16 @@ mod tests {
         let env = Env {
             network: NetworkEnv {
                 fetch_as_text: mock_fetch_as_text_with_rss_url(HashMap::from([
-                    ("http://example.com/@channel1", "rss-feed-1"),
+                    (NetUrl::from("http://example.com/@channel1"), "rss-feed-1"),
-                    ("http://example.com/@channel2", "rss-feed-2"),
+                    (NetUrl::from("http://example.com/@channel2"), "rss-feed-2"),
                 ])),
                 fetch_as_bytes: mock_network_fetch_as_bytes_with_rss_entries(HashMap::from([
                     (
-                        "rss-feed-1".into(),
+                        NetUrl::from("rss-feed-1"),
                         feed_with_three_links("c1-f1", "c1-f2", "c1-f3").to_string(),
                     ),
                     (
-                        "rss-feed-2".into(),
+                        NetUrl::from("rss-feed-2"),
                         feed_with_three_links("c2-f1", "c2-f2", "c2-f3").to_string(),
                     ),
                 ])),
@@ -114,12 +117,18 @@ mod tests {
         drop(subs_dir);
         drop(history_dir);
 
-        let mut downloads: Vec<String> = vec![];
+        let mut downloads: Vec<NetUrl> = vec![];
         for m in rx {
             downloads.push(m);
         }
 
-        assert_eq!(downloads, vec!["c1-f1", "c1-f3", "c2-f1", "c2-f2"]);
+        assert_eq!(
+            downloads,
+            ["c1-f1", "c1-f3", "c2-f1", "c2-f2"]
+                .into_iter()
+                .map(NetUrl::from)
+                .collect::<Vec<NetUrl>>()
+        );
         Ok(())
     }
 

src/network/env.rs

@@ -1,12 +1,25 @@
 use std::process::Command;
 
-use crate::prelude::*;
+use crate::{feed::ChannelName, prelude::*};
 
-pub type NetworkFetchAsTextFn = Box<dyn Fn(&str) -> Result<String>>;
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct NetUrl(pub String);
+impl NetUrl {
+    pub fn from(url: &str) -> Self {
+        Self(url.to_string())
+    }
+}
+impl std::fmt::Display for NetUrl {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.0.as_str())
+    }
+}
 
-pub type NetworkFetchAsBytesFn = Box<dyn Fn(&str) -> Result<bytes::Bytes>>;
+pub type NetworkFetchAsTextFn = Box<dyn Fn(&NetUrl) -> Result<String>>;
 
-pub type NetworkDownloadAsMp3Fn = Box<dyn Fn(&str) -> Result<()>>;
+pub type NetworkFetchAsBytesFn = Box<dyn Fn(&NetUrl) -> Result<bytes::Bytes>>;
+
+pub type NetworkDownloadAsMp3Fn = Box<dyn Fn(&NetUrl, &ChannelName) -> Result<()>>;
 
 pub struct NetworkEnv {
     pub fetch_as_text: NetworkFetchAsTextFn,
@@ -17,29 +30,32 @@ impl Default for NetworkEnv {
     fn default() -> Self {
         Self {
             fetch_as_text: Box::new(|url| {
-                reqwest::blocking::get(url)
+                reqwest::blocking::get(&url.0)
                     .context(format!("Fetching {}", url))?
                     .text()
                     .context(format!("Parsing text from body of response for {}", url))
             }),
             fetch_as_bytes: Box::new(|url| {
-                reqwest::blocking::get(url)
+                reqwest::blocking::get(&url.0)
                     .context(format!("Fetching {}", url))?
                     .bytes()
                     .context(format!("Parsing bytes from body of response for {}", url))
             }),
-            download_as_mp3: Box::new(|url| {
+            download_as_mp3: Box::new(|url, channel_name| {
+                println!("Downloading: {}", url);
                 let cmd = "yt-dlp";
                 let output = Command::new(cmd)
                     .arg("--extract-audio")
                     .arg("--audio-format")
                     .arg("mp3")
-                    .arg(url)
+                    .arg("-P")
+                    .arg(format!("~/Music/{}", channel_name))
+                    .arg(&url.0)
                     .output()
                     .with_context(|| {
                         format!(
-                            "Running: {} --extract-audio --audio-format mp3 {}",
+                            "Running: {} --extract-audio --audio-format mp3 -p ~/Music/{} {}",
-                            cmd, url
+                            cmd, channel_name, url
                         )
                     })?;
                 if !output.stderr.is_empty() {

src/network/mod.rs

@@ -1,5 +1,6 @@
 mod env;
 
+pub use env::NetUrl;
 pub use env::NetworkDownloadAsMp3Fn;
 pub use env::NetworkEnv;
 pub use env::NetworkFetchAsBytesFn;

src/test_utils.rs

@@ -11,8 +11,9 @@ use anyhow::Context;
 use tempfile::{tempdir, TempDir};
 
 use crate::{
+    feed::ChannelName,
     file::{FileAppendLineFn, FileOpenFn},
-    network::{NetworkDownloadAsMp3Fn, NetworkFetchAsBytesFn, NetworkFetchAsTextFn},
+    network::{NetUrl, NetworkDownloadAsMp3Fn, NetworkFetchAsBytesFn, NetworkFetchAsTextFn},
     prelude::*,
 };
 
@@ -35,10 +36,8 @@ pub fn read_text_file(path: &Path, file_name: &str) -> Result<Vec<String>> {
         .map(String::from)
         .collect())
 }
-pub fn mock_fetch_as_text_with_rss_url(
+pub fn mock_fetch_as_text_with_rss_url(map: HashMap<NetUrl, &'static str>) -> NetworkFetchAsTextFn {
-    map: HashMap<&'static str, &'static str>,
+    Box::new(move |url: &NetUrl| {
-) -> NetworkFetchAsTextFn {
-    Box::new(move |url: &str| {
         map.get(url).map_or_else(
             || Err(anyhow!("Unexpected request for {}", url)),
             |url| Ok(format!(r#"<html><link title="RSS" href="{}"></html>"#, url)),
@@ -46,7 +45,7 @@ pub fn mock_fetch_as_text_with_rss_url(
     })
 }
 pub fn mock_network_fetch_as_bytes_with_rss_entries(
-    feeds: HashMap<String, String>,
+    feeds: HashMap<NetUrl, String>,
 ) -> NetworkFetchAsBytesFn {
     Box::new(move |url| {
         feeds.get(url).cloned().map_or_else(
@@ -71,9 +70,9 @@ pub fn mock_file_open(real_paths: HashMap<String, String>) -> FileOpenFn {
     })
 }
 
-pub fn mock_network_download_as_mp3(tx: Sender<String>) -> NetworkDownloadAsMp3Fn {
+pub fn mock_network_download_as_mp3(tx: Sender<NetUrl>) -> NetworkDownloadAsMp3Fn {
-    Box::new(move |url: &str| {
+    Box::new(move |url: &NetUrl, _channel_name: &ChannelName| {
-        tx.send(url.into())?;
+        tx.send(url.clone())?;
         Ok(())
     })
 }
@@ -83,8 +82,14 @@ pub fn mock_file_append_line() -> FileAppendLineFn {
 }
 
 pub fn stub_network_fetch_as_bytes() -> NetworkFetchAsBytesFn {
-    Box::new(|url: &str| Err(anyhow!("Not implemented: network_fetch_as_bytes: {}", url)))
+    Box::new(|url: &NetUrl| Err(anyhow!("Not implemented: network_fetch_as_bytes: {}", url)))
 }
 pub fn stub_network_download_as_mp3() -> NetworkDownloadAsMp3Fn {
-    Box::new(|url: &str| Err(anyhow!("Not implemented: network_download_as_mp3: {}", url)))
+    Box::new(|url: &NetUrl, channel_name: &ChannelName| {
+        Err(anyhow!(
+            "Not implemented: network_download_as_mp3: ({}) {}",
+            channel_name,
+            url,
+        ))
+    })
 }