Refactor thread responses into an enum.

Lays ground work for different types of views, i.e. email, news, docs, etc.

server/src/newsreader.rs

@@ -14,7 +14,7 @@ const THREAD_PREFIX: &'static str = "news:";
 use crate::{
     compute_offset_limit,
     error::ServerError,
-    graphql::{Body, Email, Html, Message, Tag, Thread, ThreadSummary},
+    graphql::{Body, Email, EmailThread, Html, Message, Tag, ThreadSummary},
     AddOutlink, EscapeHtml, InlineStyle, SanitizeHtml, SlurpContents, StripHtml, Transformer,
 };
 
@@ -143,7 +143,7 @@ pub async fn tags(pool: &PgPool, _needs_unread: bool) -> Result<Vec<Tag>, Server
     Ok(tags)
 }
 
-pub async fn thread(pool: &PgPool, thread_id: String) -> Result<Thread, ServerError> {
+pub async fn thread(pool: &PgPool, thread_id: String) -> Result<EmailThread, ServerError> {
     let id = thread_id
         .strip_prefix(THREAD_PREFIX)
         .expect("news thread doesn't start with '{THREAD_PREFIX}'")
@@ -198,7 +198,6 @@ pub async fn thread(pool: &PgPool, thread_id: String) -> Result<Thread, ServerEr
     // * Grafana does <div class="image-wrapp"><img class="lazyload>"<img src="/media/...>"</img></div>
     // * Some sites appear to be HTML encoded, unencode them, i.e. imperialviolent
     let body_tranformers: Vec<Box<dyn Transformer>> = vec![
-        // TODO: add a map of urls and selectors
         Box::new(SlurpContents {
             site_selectors: hashmap![
                 "hackaday.com".to_string() => vec![
@@ -237,7 +236,7 @@ pub async fn thread(pool: &PgPool, thread_id: String) -> Result<Thread, ServerEr
         name: r.name,
         addr: addr.map(|a| a.to_string()),
     });
-    Ok(Thread {
+    Ok(EmailThread {
         thread_id,
         subject: title.clone(),
         messages: vec![Message {