feat: add config.theme for templates subdirectory

src/feed_store.rs

@@ -1,4 +1,4 @@
-use anyhow::{Result, bail};
+use anyhow::{bail, Result};
 use camino::{Utf8Path, Utf8PathBuf};
 use chrono::{DateTime, Duration, Utc};
 use feed_rs::model::Entry;
@@ -259,7 +259,7 @@ impl FeedStore {
                 Err(e) => {
                     warn!("Problem parsing feed file for feed {}: {}", feed_url, e);
                     continue;
-                },
+                }
             };
 
             for entry in &mut feed.entries {

src/main.rs

@@ -71,6 +71,11 @@ struct Config {
     max_entries: usize,
     /// How soon to refresh, in hours
     refresh: usize,
+    /// A theme to apply, if any.
+    ///
+    /// This is a folder in the templates_dir. If an assets directory
+    /// exists within, the contents will be copied over to the out_dir.
+    theme: Option<String>,
 }
 
 pub fn to_checked_pathbuf(dir: &str) -> Utf8PathBuf {

src/template_engine.rs

@@ -2,13 +2,18 @@ use crate::feed_store::FeedStore;
 use crate::to_checked_pathbuf;
 use crate::Config;
 use anyhow::Result;
+use camino::Utf8Path;
 use feed_rs::model::Feed;
 use std::collections::HashMap;
 use std::fs::File;
 use tera::{from_value, Tera};
 
 pub fn build(config: &Config, feed_store: &mut FeedStore) -> Result<()> {
-    let mut tera = create_tera(&config.templates_dir)?;
+    let mut tera = if let Some(theme) = &config.theme {
+        create_tera(&config.templates_dir.join(theme))?
+    } else {
+        create_tera(&config.templates_dir)?
+    };
     let out_dir = to_checked_pathbuf(&config.out_dir);
 
     let mut context = tera::Context::new();