Implement support for editing page title

assets/script.js

@@ -15,9 +15,9 @@ function queryArgsFromForm(form) {
 
 let hasBeenOpen = false;
 function openEditor() {
-    const article = document.querySelector("article");
-    const rendered = article.querySelector(".rendered");
-    const editor = article.querySelector(".editor");
+    const container = document.querySelector(".container");
+    const rendered = container.querySelector(".rendered");
+    const editor = container.querySelector(".editor");
     const textarea = editor.querySelector('textarea[name="body"]');
     const shadow = editor.querySelector('textarea.shadow-control');
     const form = editor.querySelector("form");
@@ -29,7 +29,7 @@ function openEditor() {
 
     textarea.style.height = rendered.clientHeight + "px";
 
-    article.classList.add('edit');
+    container.classList.add('edit');
 
     autosizeTextarea(textarea, shadow);
 
@@ -63,11 +63,23 @@ function openEditor() {
             if (!response.ok) throw new Error("Unexpected status code (" + response.status + ")");
 
             const result = await response.json();
-            form.elements.base_revision.value = result.revision;
+
+            // Update url-bar, page title and footer
+            window.history.replaceState(null, result.title, result.slug);
+            document.querySelector("title").textContent = result.title;
             revision.textContent = result.revision;
             lastUpdated.textContent = result.created;
+
+            // Update body:
             rendered.innerHTML = result.rendered;
-            article.classList.remove('edit');
+
+            // Update form:
+            form.elements.base_revision.value = result.revision;
+            for (const element of form.elements) {
+                element.defaultValue = element.value;
+            }
+
+            container.classList.remove('edit');
 
             textarea.disabled = false;
         }()
@@ -82,7 +94,7 @@ function openEditor() {
         ev.preventDefault();
         ev.stopPropagation();
 
-        article.classList.remove('edit');
+        container.classList.remove('edit');
         form.reset();
     });
 }

assets/style.css

@@ -91,7 +91,7 @@ body {
   display: flex;
   flex-direction: column;
 }
-article {
+.container {
   flex: 1;
 }
 
@@ -146,6 +146,15 @@ textarea {
     overflow: hidden;
 }
 
+h1>input {
+    font: inherit;
+    border: none;
+    background: none;
+    padding: 0;
+
+    width: 100%;
+}
+
 .shadow-control {
     visibility: hidden;
     position: fixed;

src/article_resource.rs

@@ -86,6 +86,7 @@ impl Resource for ArticleResource {
             revision: i32,
             created: &'a chrono::DateTime<Local>,
 
+            slug: &'a str,
             title: &'a str,
             raw: &'a str,
             rendered: String,
@@ -106,6 +107,7 @@ impl Resource for ArticleResource {
                             article_id: data.article_id,
                             revision: data.revision,
                             created: &Local.from_utc_datetime(&data.created),
+                            slug: &data.slug,
                             title: &data.title,
                             raw: &data.body,
                             rendered: render_markdown(&data.body),
@@ -125,12 +127,22 @@ impl Resource for ArticleResource {
         #[derive(Deserialize)]
         struct UpdateArticle {
             base_revision: i32,
+            title: String,
             body: String,
         }
 
+        #[derive(BartDisplay)]
+        #[template="templates/article_revision_contents.html"]
+        struct Template<'a> {
+            title: &'a str,
+            rendered: String,
+        }
+
         #[derive(Serialize)]
         struct PutResponse<'a> {
+            slug: &'a str,
             revision: i32,
+            title: &'a str,
             rendered: &'a str,
             created: &'a str,
         }
@@ -143,15 +155,20 @@ impl Resource for ArticleResource {
                     .map_err(Into::into)
             })
             .and_then(move |update: UpdateArticle| {
-                self.state.update_article(self.article_id, update.base_revision, update.body)
+                self.state.update_article(self.article_id, update.base_revision, update.title, update.body)
             })
             .and_then(|updated| {
                 futures::finished(Response::new()
                     .with_status(hyper::StatusCode::Ok)
                     .with_header(ContentType(APPLICATION_JSON.clone()))
                     .with_body(serde_json::to_string(&PutResponse {
+                        slug: &updated.slug,
                         revision: updated.revision,
-                        rendered: &render_markdown(&updated.body),
+                        title: &updated.title,
+                        rendered: &Template {
+                            title: &updated.title,
+                            rendered: render_markdown(&updated.body),
+                        }.to_string(),
                         created: &Local.from_utc_datetime(&updated.created).to_string(),
                     }).expect("Should never fail"))
                 )

src/state.rs

@@ -26,7 +26,7 @@ pub enum SlugLookup {
     Redirect(String),
 }
 
-fn decide_slug(conn: &SqliteConnection, prev_title: &str, title: &str, prev_slug: &str) -> Result<String, Error> {
+fn decide_slug(conn: &SqliteConnection, article_id: i32, prev_title: &str, title: &str, prev_slug: &str) -> Result<String, Error> {
     if title == prev_title {
         return Ok(prev_slug.to_owned());
     }
@@ -44,6 +44,7 @@ fn decide_slug(conn: &SqliteConnection, prev_title: &str, title: &str, prev_slug
 
     loop {
         let slug_in_use = article_revisions::table
+            .filter(article_revisions::article_id.ne(article_id))
             .filter(article_revisions::slug.eq(&slug))
             .filter(article_revisions::latest.eq(true))
             .count()
@@ -124,7 +125,9 @@ impl State {
         })
     }
 
-    pub fn update_article(&self, article_id: i32, base_revision: i32, body: String) -> CpuFuture<models::ArticleRevision, Error> {
+    pub fn update_article(&self, article_id: i32, base_revision: i32, title: String, body: String)
+        -> CpuFuture<models::ArticleRevision, Error>
+    {
         let connection_pool = self.connection_pool.clone();
 
         self.cpu_pool.spawn_fn(move || {
@@ -150,8 +153,7 @@ impl State {
                 }
                 let new_revision = base_revision + 1;
 
-                let title = prev_title.clone(); // TODO Have title be a parameter to this function
-                let slug = decide_slug(&*conn, &prev_title, &title, &prev_slug)?;
+                let slug = decide_slug(&*conn, article_id, &prev_title, &title, &prev_slug)?;
 
                 #[derive(Insertable)]
                 #[table_name="article_revisions"]

templates/article_revision.html

@@ -1,26 +1,32 @@
 <script src="_assets/script-{{script_js_checksum}}.js" defer></script>
 
+<div class="container">
+<div class="rendered">
+{{>article_revision_contents.html}}
+</div>
+
+<div class="editor">
+<form action="" method="POST">
+
 <header>
-<h1>{{title}}</h1>
+<h1><input autocomplete=off type=text name=title value="{{title}}"></h1>
 </header>
 
 <article>
-<div class="rendered">
-{{{rendered}}}
-</div>
-<div class="editor">
-    <form action="" method="POST">
-        <input autocomplete=off type=hidden name=base_revision value="{{revision}}">
-        <textarea autocomplete=off name=body>{{raw}}</textarea>
-        <textarea autocomplete=off class="shadow-control"></textarea>
-        <div class="editor-controls">
-            <a class="cancel" href="{{article_id}}">Cancel</a>
-            <button type=submit>Save</button>
-        </div>
-    </form>
-</div>
+<input autocomplete=off type=hidden name=base_revision value="{{revision}}">
+<textarea autocomplete=off name=body>{{raw}}</textarea>
+<textarea autocomplete=off class="shadow-control"></textarea>
 </article>
 
+<div class="editor-controls">
+    <a class="cancel" href="{{slug}}">Cancel</a>
+    <button type=submit>Save</button>
+</div>
+
+</form>
+</div>
+</div>
+
 <footer>
 <p><a id="openEditor" href="?editor">Edit</a></p>
 <dl>

templates/article_revision_contents.html

@@ -0,0 +1,7 @@
+<header>
+<h1>{{title}}</h1>
+</header>
+
+<article>
+{{{rendered}}}
+</article>