add tags and cache versioning

src/filters.rs

@@ -1,7 +1,9 @@
-use std::time::Duration;
+use std::{collections::HashMap, time::Duration};
 
 use chrono::{DateTime, TimeZone};
 
+use crate::post::PostMetadata;
+
 pub fn date<T: TimeZone>(date: &DateTime<T>) -> Result<String, askama::Error> {
     Ok(date.to_rfc3339_opts(chrono::SecondsFormat::Secs, true))
 }
@@ -9,3 +11,24 @@ pub fn date<T: TimeZone>(date: &DateTime<T>) -> Result<String, askama::Error> {
 pub fn duration(duration: &&Duration) -> Result<String, askama::Error> {
     Ok(format!("{:?}", duration))
 }
+
+pub fn collect_tags(posts: &Vec<PostMetadata>) -> Result<Vec<(String, u64)>, askama::Error> {
+    let mut tags = HashMap::new();
+
+    for post in posts {
+        for tag in &post.tags {
+            if let Some((existing_tag, count)) = tags.remove_entry(tag) {
+                tags.insert(existing_tag, count + 1);
+            } else {
+                tags.insert(tag.clone(), 1);
+            }
+        }
+    }
+
+    let mut tags: Vec<(String, u64)> = tags.into_iter().collect();
+
+    tags.sort_unstable_by_key(|(v, _)| v.clone());
+    tags.sort_by_key(|(_, v)| -(*v as i64));
+
+    Ok(tags)
+}

src/main.rs

@@ -37,6 +37,7 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, EnvFilte
 
 use crate::config::Config;
 use crate::error::{AppResult, PostError};
+use crate::post::cache::{Cache, CACHE_VERSION};
 use crate::post::{PostManager, PostMetadata, RenderStats};
 
 type ArcState = Arc<AppState>;
@@ -179,8 +180,13 @@ async fn main() -> eyre::Result<()> {
                         .context("failed to read cache file")?;
                     buf
                 };
-                let cache =
+                let mut cache: Cache =
                     bitcode::deserialize(serialized.as_slice()).context("failed to parse cache")?;
+                if cache.version() < CACHE_VERSION {
+                    warn!("cache version changed, clearing cache");
+                    cache = Cache::default();
+                };
+
                 Ok::<PostManager, color_eyre::Report>(PostManager::new_with_cache(
                     config.dirs.posts.clone(),
                     config.render.clone(),

src/post/cache.rs

@@ -7,6 +7,9 @@ use tracing::{debug, instrument};
 use crate::config::RenderConfig;
 use crate::post::PostMetadata;
 
+/// do not persist cache if this version number changed
+pub const CACHE_VERSION: u16 = 1;
+
 #[derive(Serialize, Deserialize, Clone)]
 pub struct CacheValue {
     pub metadata: PostMetadata,
@@ -15,8 +18,14 @@ pub struct CacheValue {
     config_hash: u64,
 }
 
-#[derive(Serialize, Deserialize, Default, Clone)]
-pub struct Cache(HashMap<String, CacheValue>);
+#[derive(Serialize, Deserialize, Clone)]
+pub struct Cache(HashMap<String, CacheValue>, u16);
+
+impl Default for Cache {
+    fn default() -> Self {
+        Self(Default::default(), CACHE_VERSION)
+    }
+}
 
 impl Cache {
     pub async fn lookup(
@@ -117,4 +126,9 @@ impl Cache {
         let new_size = self.0.len();
         debug!("removed {i} entries ({old_size} -> {new_size} entries)");
     }
+
+    #[inline(always)]
+    pub fn version(&self) -> u16 {
+        self.1
+    }
 }

src/post/mod.rs

@@ -1,5 +1,6 @@
-mod cache;
+pub mod cache;
 
+use std::collections::BTreeSet;
 use std::io;
 use std::path::{Path, PathBuf};
 use std::time::{Duration, Instant, SystemTime};
@@ -27,7 +28,7 @@ struct FrontMatter {
     pub created_at: Option<DateTime<Utc>>,
     pub modified_at: Option<DateTime<Utc>>,
     #[serde(default)]
-    pub tags: Vec<String>,
+    pub tags: BTreeSet<String>,
 }
 
 impl FrontMatter {
@@ -45,7 +46,7 @@ impl FrontMatter {
             icon: self.icon,
             created_at: self.created_at.or_else(|| created.map(|t| t.into())),
             modified_at: self.modified_at.or_else(|| modified.map(|t| t.into())),
-            tags: self.tags,
+            tags: self.tags.into_iter().collect(),
         }
     }
 }

static/style.css

@@ -30,8 +30,7 @@
 :root,
 code {
 	/* please have one at least one good monospace font */
-	font-family: "Hack", "Hack Nerd Font", "JetBrains Mono",
-		"JetBrainsMono Nerd Font", "Ubuntu Mono", monospace, sans-serif;
+	font-family: "Hack", "Hack Nerd Font", "JetBrains Mono", "JetBrainsMono Nerd Font", "Ubuntu Mono", monospace, sans-serif;
 }
 
 :root {
@@ -81,6 +80,10 @@ footer {
 	opacity: 0.65;
 }
 
+div.post {
+	margin-bottom: 1em;
+}
+
 /* BEGIN cool effect everyone liked */
 
 body {

templates/index.html

@@ -1,3 +1,4 @@
+{%- import "macros.askama" as macros -%}
 <!DOCTYPE html>
 <html lang="en">
 	<head>
@@ -16,21 +17,24 @@
 			<h2>posts</h2>
 			<!-- prettier-ignore -->
 			<div>
-			{% for post in posts %}
-				<p>
+				{% for post in posts %}
+				<div class="post">
 					<a href="/posts/{{ post.name }}"><b>{{ post.title }}</b></a>
 					<span class="post-author">- by {{ post.author }}</span>
 					<br />
 					{{ post.description }}<br />
-					{% match post.created_at %} {% when Some(created_at) %}
-						written:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {{ created_at|date }}<br />
-					{% when None %} {% endmatch %}
-					{% match post.modified_at %} {% when Some(modified_at) %}
-						last modified: {{ modified_at|date }}
-					{% when None %} {% endmatch %}
-				</p>
-			{% endfor %}
+					{% call macros::table(post) %}
+				</div>
+				{% endfor %}
 			</div>
+			{% let tags = posts|collect_tags %}<!-- prettier-br -->
+			{% if !tags.is_empty() %}
+			<h2>tags</h2>
+			{% endif %}<!-- prettier-br -->
+			{% for tag in tags %}
+			<a href="/?tag={{ tag.0 }}" title="view all posts with this tag">{{ tag.0 }}</a>
+			<span class="post-author">- {{ tag.1 }} post{% if tag.1 != 1 %}s{%endif %}</span><br />
+			{% endfor %}
 		</main>
 	</body>
 </html>

templates/macros.askama

@@ -0,0 +1,19 @@
+{% macro table(post) %}
+    {% match post.created_at %}
+        {% when Some(created_at) %}
+            written:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {{ created_at|date }}<br />
+        {% when None %}
+    {% endmatch %}
+    {% match post.modified_at %}
+        {% when Some(modified_at) %}
+            last modified: {{ modified_at|date }}<br />
+        {% when None %}
+    {% endmatch %}
+
+    {% if !post.tags.is_empty() %}
+        tags:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+        {% for tag in post.tags %}
+            <a href="/?tag={{ tag }}" title="view all posts with this tag">{{ tag }}</a>
+        {% endfor %}<br />
+    {% endif %}
+{% endmacro %}

templates/post.html

@@ -1,3 +1,4 @@
+{%- import "macros.askama" as macros -%}
 <h1 class="post-title">
 	{{ meta.title }}
 	<span class="post-author">- by {{ meta.author }}</span>
@@ -6,12 +7,7 @@
 <p>
 	<!-- prettier-ignore -->
 	<div>
-	{% match meta.created_at %} {% when Some(created_at) %}
-		written:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; {{ created_at|date }}<br />
-	{% when None %} {% endmatch %}
-	{% match meta.modified_at %} {% when Some(modified_at) %}
-		last modified: {{ modified_at|date }}
-	{% when None %} {% endmatch %}
+	{% call macros::table(meta) %}
 	</div>
 	<a href="/posts/{{ meta.name }}">link</a><br />
 	<a href="/">back to home</a>