good enough for MVP

src/main.rs

@@ -37,6 +37,7 @@ struct Config {
     common_ninjas: Vec<wac_common_ninja::Config>,
     icals: Vec<wac_ical::Config>,
     output: output::Config,
+    feeds: Vec<SimpleDownload>,
 }
 
 impl Config {
@@ -52,10 +53,11 @@ impl Config {
             .chain(self.icals.iter().map(|ical| ical.dl.clone()))
     }
 
-    fn upstreams(&self) -> Vec<CalendarUi> {
+    fn upstream_calendars(&self) -> Vec<CalendarUi> {
         let Self {
             campfires,
             common_ninjas,
+            feeds: _,
             icals,
             output: _,
         } = self;
@@ -161,7 +163,7 @@ struct Data {
     icals: Vec<wac_ical::Calendar>,
 }
 
-fn read_data_from_disk(config: &Config) -> Result<Data> {
+fn read_calendars(config: &Config) -> Result<Data> {
     Ok(Data {
         campfires: config
             .campfires
@@ -256,9 +258,19 @@ async fn do_everything(cli: &CliAuto) -> Result<()> {
         std::fs::rename(&temp_path, &dl.file_path)?;
     }
 
-    let data = read_data_from_disk(&config)?;
+    let events = {
-    let instances = process_data(&data, &config.output, now)?;
+        let cal_data = read_calendars(&config)?;
-    output::write_html(&config.output, &config.upstreams(), &instances, now)?;
+        process_data(&cal_data, &config.output, now)?
+    };
+    let feed_items = read_feeds(&config)?;
+
+    output::write_html(
+        &config.output,
+        &feed_items,
+        &config.upstream_calendars(),
+        &events,
+        now,
+    )?;
     Ok(())
 }
 
@@ -280,31 +292,40 @@ fn main_auto(cli: CliAuto) -> Result<()> {
 }
 
 #[derive(clap::Parser)]
-struct CliDebugOutput {
+struct CliDebugEvents {
     #[arg(long)]
     config: Utf8PathBuf,
 }
 
-fn main_debug_output(cli: CliDebugOutput) -> Result<()> {
+fn main_debug_events(cli: CliDebugEvents) -> Result<()> {
     tracing_subscriber::fmt::init();
     tracing::info!("Started tracing");
     let config = std::fs::read_to_string(&cli.config).context("Failed to read config file")?;
     let config: Config = toml::from_str(&config).context("Failed to parse config file")?;
 
-    let data = read_data_from_disk(&config).context("Failed to read data from disk")?;
-
     let tz = &config.output.timezone;
     let now = Utc::now().with_timezone(tz);
-    let instances = process_data(&data, &config.output, now).context("Failed to process data")?;
+    let data = read_calendars(&config).context("Failed to read data from disk")?;
-    output::write_html(&config.output, &config.upstreams(), &instances, now)
+
-        .context("Failed to output HTML")?;
+    let events = process_data(&data, &config.output, now).context("Failed to process data")?;
+
+    std::fs::create_dir_all("output")?;
+    output::atomic_write(
+        "output/calendars.html",
+        &output::calendars_page(&config.upstream_calendars(), now),
+    )?;
+    output::atomic_write(
+        "output/index.html",
+        &output::index_page(&config.output, &events, now),
+    )?;
 
     Ok(())
 }
 
 #[derive(clap::Parser)]
-struct CliDebugRss {
+struct CliDebugFeed {
-    paths: Vec<Utf8PathBuf>,
+    #[arg(long)]
+    config: Utf8PathBuf,
 }
 
 /// Wraps rss::Item in our own type suitable for merging
@@ -314,12 +335,11 @@ pub(crate) struct FeedItem {
     inner: rss::Item,
 }
 
-fn main_debug_rss(cli: CliDebugRss) -> Result<()> {
+fn read_feeds(config: &Config) -> Result<Vec<FeedItem>> {
     let mut items = Vec::new();
-    let now = Utc::now();
 
-    for path in &cli.paths {
+    for feed in &config.feeds {
-        let s = std::fs::read(path)?;
+        let s = std::fs::read(&feed.file_path)?;
         let channel = rss::Channel::read_from(std::io::BufReader::new(std::io::Cursor::new(s)))?;
 
         let channel_title = channel.title.clone();
@@ -340,30 +360,65 @@ fn main_debug_rss(cli: CliDebugRss) -> Result<()> {
         }
     }
 
-    items.sort_by_key(|item| item.date);
+    items.sort_by_key(|item| std::cmp::Reverse(item.date));
+    Ok(items)
+}
 
-    for item in items.iter().rev() {
+fn main_debug_feed(cli: CliDebugFeed) -> Result<()> {
-        println!("{}", item.channel_title);
+    tracing_subscriber::fmt::init();
-        println!("{}", item.inner.title.as_ref().unwrap());
+    tracing::info!("Started tracing");
-        println!("{}", item.date.to_rfc3339());
+    let config = std::fs::read_to_string(&cli.config).context("Failed to read config file")?;
-        println!("{}", item.inner.link.as_ref().unwrap());
+    let config: Config = toml::from_str(&config).context("Failed to parse config file")?;
-        println!();
+
-    }
+    let tz = &config.output.timezone;
+    let now = Utc::now().with_timezone(tz);
+    let items = read_feeds(&config)?;
 
     std::fs::create_dir_all("output")?;
-    output::atomic_write(
+    output::atomic_write("output/feed.html", &output::feed_page(&items, now))?;
-        "output/feed.html",
-        &output::feed_page(&items, now.with_timezone(&chrono_tz::UTC)),
-    )?;
 
     Ok(())
 }
 
+#[derive(clap::Parser)]
+struct CliDebugOutput {
+    #[arg(long)]
+    config: Utf8PathBuf,
+}
+
+fn main_debug_output(cli: CliDebugOutput) -> Result<()> {
+    tracing_subscriber::fmt::init();
+    tracing::info!("Started tracing");
+    let config = std::fs::read_to_string(&cli.config).context("Failed to read config file")?;
+    let config: Config = toml::from_str(&config).context("Failed to parse config file")?;
+
+    let tz = &config.output.timezone;
+    let now = Utc::now().with_timezone(tz);
+
+    let events = {
+        let data = read_calendars(&config).context("Failed to read calendars from disk")?;
+        process_data(&data, &config.output, now).context("Failed to process data")?
+    };
+
+    let feed_items = read_feeds(&config)?;
+
+    std::fs::create_dir_all("output")?;
+    output::write_html(
+        &config.output,
+        &feed_items,
+        &config.upstream_calendars(),
+        &events,
+        now,
+    )?;
+    Ok(())
+}
+
 #[derive(clap::Subcommand)]
 enum Commands {
     Auto(CliAuto),
+    DebugEvents(CliDebugEvents),
+    DebugFeed(CliDebugFeed),
     DebugOutput(CliDebugOutput),
-    DebugRss(CliDebugRss),
 }
 
 #[derive(clap::Parser)]
@@ -378,7 +433,8 @@ fn main() -> Result<()> {
 
     match cli.command {
         Commands::Auto(x) => main_auto(x),
+        Commands::DebugEvents(x) => main_debug_events(x),
+        Commands::DebugFeed(x) => main_debug_feed(x),
         Commands::DebugOutput(x) => main_debug_output(x),
-        Commands::DebugRss(x) => main_debug_rss(x),
     }
 }

src/output.rs

@@ -74,7 +74,10 @@ fn calendar_link(calendar_ui: &crate::CalendarUi) -> maud::PreEscaped<String> {
     }
 }
 
-fn calendars_page(upstreams: &[crate::CalendarUi], now: DateTime<chrono_tz::Tz>) -> String {
+pub(crate) fn calendars_page(
+    upstreams: &[crate::CalendarUi],
+    now: DateTime<chrono_tz::Tz>,
+) -> String {
     let description = "A list of upstream calendars used by this Wide-Angle Calendar instance";
     let title = "Upstream calendars";
 
@@ -98,13 +101,13 @@ fn calendars_page(upstreams: &[crate::CalendarUi], now: DateTime<chrono_tz::Tz>)
             }
             body {
                 h1 { (title) }
+                p { "Written at: " (now.format("%F %T")) }
                 p {
                     a href="index.html" { "Wide-Angle Calendar" }
                     " / "
                     a href="calendars.html" { (title) }
                 }
 
-                p { "Written at: " (now.format("%F %T")) }
                 p { "These are the calendars that Wide-Angle Calendar pulls from." }
 
                 ol {
@@ -118,11 +121,103 @@ fn calendars_page(upstreams: &[crate::CalendarUi], now: DateTime<chrono_tz::Tz>)
     .into_string()
 }
 
-pub(crate) fn feed_page(_feed_items: &[crate::FeedItem], _now: DateTime<chrono_tz::Tz>) -> String {
+pub(crate) fn feed_page(feed_items: &[crate::FeedItem], now: DateTime<chrono_tz::Tz>) -> String {
-    todo!()
+    let mut feed_items = feed_items.iter();
+    let mut machine = date_machine::StateMachine::default();
+    let mut html_list = vec![];
+
+    loop {
+        match machine.pull() {
+            date_machine::Output::Data(date_machine::DataChunk { month, date, items }) => {
+                if let Some(month) = month {
+                    html_list.push(maud::html! { h2 { (month) } });
+                }
+                html_list.push(maud::html! {
+                    (day_link(date))
+                    hr{}
+                    ul {
+                        @for item in items {
+                            li {
+                                (item)
+                            }
+                        }
+                    }
+                });
+            }
+            date_machine::Output::EndOfInput => break,
+            date_machine::Output::NeedInput => {}
+        }
+
+        if let Some(item) = feed_items.next() {
+            let desc = item
+                .inner
+                .description
+                .as_ref()
+                .map(|desc| match desc.get(0..100) {
+                    None => desc.to_string(),
+                    Some(short_desc) => format!("{short_desc} ..."),
+                });
+
+            machine.push(
+                item.date.date_naive(),
+                maud::html! {
+                    @if let Some(link) = &item.inner.link {
+                        a href = (link) { (item.inner.title.as_deref().unwrap_or_default()) }
+                    } @else {
+                        (item.inner.title.as_deref().unwrap_or_default())
+                    }
+                    ul {
+                        @if let Some(desc) = desc {
+                            li { (desc) }
+                        }
+                        li { (item.channel_title) }
+                    }
+                },
+            );
+        } else {
+            machine.flush();
+        }
+    }
+
+    let description = "A feed merged from several input feeds";
+    let title = "Feed";
+
+    maud::html! {
+        (maud::PreEscaped("<!DOCTYPE html>"))
+        html lang="en" {
+            head {
+                meta http-equiv="Content-Type" content="text/html; charset=utf-8" {}
+                meta name="viewport" content="width=device-width, initial-scale=1" {}
+                (maud::PreEscaped(CSS))
+
+                meta property="og:locale" content="en" {}
+                meta property="og:type" content="website" {}
+
+                meta name="description" content=(description) {}
+                meta property="description" content=(description) {}
+                meta property="og:description" content=(description) {}
+
+                title { (title) }
+                met property="og:title" content=(title) {}
+            }
+            body {
+                h1 { (title) }
+                p { "Written at: " (now.format("%F %T")) " (But it may lag by several hours - Not for ICE spotting)" }
+                p {
+                    a href="index.html" { "Wide-Angle Calendar" }
+                    " / "
+                    a href="feed.html" { (title) }
+                }
+                @for entry in html_list {
+                    (entry)
+                }
+            }
+        }
+    }
+    .into_string()
 }
 
-fn index_page(
+pub(crate) fn index_page(
     config: &Config,
     instances: &[EventInstance],
     now: DateTime<chrono_tz::Tz>,
@@ -248,7 +343,13 @@ fn index_page(
                 h1 { (title) }
                 img src="hero.webp" width="700" height="233" {}
                 p { "Written at: " (now.format("%F %T")) }
-                p { a href = "calendars.html" { "Upstream calendars" } }
+                p {
+                    "Sub-pages:"
+                    ul {
+                        li { a href = "calendars.html" { "Upstream calendars" } }
+                        li { a href = "feed.html" { "Feed" } }
+                    }
+                }
                 @for entry in html_list {
                     (entry)
                 }
@@ -267,16 +368,224 @@ pub(crate) fn atomic_write(path: &str, content: &str) -> Result<()> {
 
 pub(crate) fn write_html(
     config: &Config,
-    // feed_items: &[crate::FeedItem],
+    feed_items: &[crate::FeedItem],
-    upstreams: &[crate::CalendarUi],
+    upstream_calendars: &[crate::CalendarUi],
-    instances: &[EventInstance],
+    events: &[EventInstance],
     now: DateTime<chrono_tz::Tz>,
 ) -> Result<()> {
     std::fs::create_dir_all("output")?;
 
-    atomic_write("output/calendars.html", &calendars_page(upstreams, now))?;
+    atomic_write(
-    // atomic_write("output/feed.html", &feed_page(feed_items, now)?)?;
+        "output/calendars.html",
-    atomic_write("output/index.html", &index_page(config, instances, now))?;
+        &calendars_page(upstream_calendars, now),
+    )?;
+    atomic_write("output/feed.html", &feed_page(feed_items, now))?;
+    atomic_write("output/index.html", &index_page(config, events, now))?;
 
     Ok(())
 }
+
+/// Takes in a stream of items with dates, and formats them out categorized by month and date.
+mod date_machine {
+    use chrono::NaiveDate;
+    use std::{cmp::PartialEq, collections::VecDeque, fmt};
+
+    pub(crate) struct DataChunk<T> {
+        pub(crate) month: Option<String>,
+        pub(crate) date: NaiveDate,
+        pub(crate) items: Vec<T>,
+    }
+
+    // Debug only if T: Debug
+    impl<T: fmt::Debug> fmt::Debug for DataChunk<T> {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            f.debug_struct("DataChunk")
+                .field("month", &self.month)
+                .field("date", &self.date)
+                .field("items", &self.items)
+                .finish()
+        }
+    }
+
+    // PartialEq only if T: PartialEq
+    impl<T: PartialEq> PartialEq for DataChunk<T> {
+        fn eq(&self, other: &Self) -> bool {
+            self.month == other.month && self.date == other.date && self.items == other.items
+        }
+    }
+
+    pub(crate) enum Output<T> {
+        Data(DataChunk<T>),
+        EndOfInput,
+        NeedInput,
+    }
+
+    // Debug only if T: Debug
+    impl<T: fmt::Debug> fmt::Debug for Output<T> {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            match self {
+                Output::Data(chunk) => f.debug_tuple("Data").field(chunk).finish(),
+                Output::EndOfInput => f.write_str("EndOfInput"),
+                Output::NeedInput => f.write_str("NeedInput"),
+            }
+        }
+    }
+
+    // PartialEq only if T: PartialEq
+    impl<T: PartialEq> PartialEq for Output<T> {
+        fn eq(&self, other: &Self) -> bool {
+            match (self, other) {
+                (Output::Data(a), Output::Data(b)) => a == b,
+                (Output::EndOfInput, Output::EndOfInput) => true,
+                (Output::NeedInput, Output::NeedInput) => true,
+                _ => false,
+            }
+        }
+    }
+
+    #[derive(Default)]
+    pub(crate) struct StateMachine<T> {
+        data: VecDeque<DataChunk<T>>,
+        flushed: bool,
+        last_month_printed: Option<String>,
+    }
+
+    impl<T> StateMachine<T> {
+        pub(crate) fn pull(&mut self) -> Output<T> {
+            if self.data.len() >= 2
+                && let Some(chunk) = self.data.pop_front()
+            {
+                if chunk.month.is_some() && self.last_month_printed != chunk.month {
+                    self.last_month_printed = chunk.month.clone();
+                }
+                return Output::Data(chunk);
+            }
+            if self.flushed {
+                if let Some(chunk) = self.data.pop_front() {
+                    return Output::Data(chunk);
+                }
+                return Output::EndOfInput;
+            }
+            Output::NeedInput
+        }
+
+        pub(crate) fn push(&mut self, date: NaiveDate, item: T) {
+            let month = Some(date.format("%B").to_string());
+            let month = if month == self.last_month_printed {
+                None
+            } else {
+                month
+            };
+            if let Some(chunk) = self.data.front_mut() {
+                if chunk.date == date {
+                    chunk.items.push(item);
+                } else if chunk.month == month {
+                    self.data.push_back(DataChunk {
+                        month: None,
+                        date,
+                        items: vec![item],
+                    });
+                } else {
+                    self.data.push_back(DataChunk {
+                        month,
+                        date,
+                        items: vec![item],
+                    });
+                }
+            } else {
+                self.data.push_back(DataChunk {
+                    month,
+                    date,
+                    items: vec![item],
+                });
+            }
+        }
+
+        pub(crate) fn flush(&mut self) {
+            self.flushed = true;
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use chrono::NaiveDate;
+
+    #[test]
+    fn date_state_machine() {
+        use super::date_machine::*;
+
+        let mut machine: StateMachine<&str> = StateMachine::default();
+        let mut items = vec![
+            (2025, 09, 10, "alpha"),
+            (2025, 09, 10, "bravo"),
+            (2025, 09, 11, "charlie"),
+            (2025, 09, 12, "delta"),
+            (2025, 09, 13, "echo"),
+            (2025, 10, 1, "foxtrot"),
+            (2025, 10, 2, "golf"),
+            (2025, 10, 3, "hotel"),
+        ]
+        .into_iter();
+        let mut output = vec![];
+
+        loop {
+            match machine.pull() {
+                Output::Data(chunk) => {
+                    output.push(chunk);
+                    continue;
+                }
+                Output::EndOfInput => break,
+                Output::NeedInput => {}
+            }
+
+            if let Some((y, m, d, item)) = items.next() {
+                let date = NaiveDate::from_ymd_opt(y, m, d).unwrap();
+                machine.push(date, item);
+            } else {
+                machine.flush();
+            }
+        }
+
+        let expected = vec![
+            DataChunk {
+                month: Some("September".to_string()),
+                date: NaiveDate::from_ymd_opt(2025, 09, 10).unwrap(),
+                items: vec!["alpha", "bravo"],
+            },
+            DataChunk {
+                month: None,
+                date: NaiveDate::from_ymd_opt(2025, 09, 11).unwrap(),
+                items: vec!["charlie"],
+            },
+            DataChunk {
+                month: None,
+                date: NaiveDate::from_ymd_opt(2025, 09, 12).unwrap(),
+                items: vec!["delta"],
+            },
+            DataChunk {
+                month: None,
+                date: NaiveDate::from_ymd_opt(2025, 09, 13).unwrap(),
+                items: vec!["echo"],
+            },
+            DataChunk {
+                month: Some("October".to_string()),
+                date: NaiveDate::from_ymd_opt(2025, 10, 1).unwrap(),
+                items: vec!["foxtrot"],
+            },
+            DataChunk {
+                month: None,
+                date: NaiveDate::from_ymd_opt(2025, 10, 2).unwrap(),
+                items: vec!["golf"],
+            },
+            DataChunk {
+                month: None,
+                date: NaiveDate::from_ymd_opt(2025, 10, 3).unwrap(),
+                items: vec!["hotel"],
+            },
+        ];
+        assert_eq!(output, expected, "{output:#?} != {expected:#?}");
+
+        assert_eq!("abc".get(0..100).unwrap_or("abc"), "abc");
+    }
+}