Added vim-like navigation (#12)

themes/alejandro-angulo/assets/css/main.css

@@ -78,3 +78,8 @@ a:hover {
   padding: 1em;
   overflow-x: scroll;
 }
+
+.active:before {
+  content: "> ";
+  font-size: 0.7em;
+}

themes/alejandro-angulo/assets/js/keynav.js

@@ -8,36 +8,143 @@
  * - G (scroll to bottom)
  */
 
-const scroll_vertical = 100;
-const scroll_behavior = "smooth";
 let last_key = null;
 
-document.addEventListener("keydown", (e) => {
-  console.log(e);
+class ContentItems {
+  constructor() {
+    this.items = document.getElementsByClassName("content-item");
+    this.current_index = 0;
 
-  let scroll_factor = 1;
-
-  if (e.key === "k") {
-    scroll_factor *= -1;
+    if (this.items.length) {
+      this.items[0].parentElement.classList.add("active");
+    }
   }
 
+  get current_item() {
+    return this.items[this.current_index];
+  }
+
+  _traverse(delta) {
+    this.current_index += delta;
+
+    if (this.current_index >= this.items.length) {
+      console.warn("Items exhausted (returning last item)");
+      this.current_index = this.items.length - 1;
+    } else if (this.current_index < 0) {
+      console.warn("Items exhausted (returning first item)");
+      this.current_index = 0;
+    }
+
+    return this.current_item;
+  }
+
+  next() {
+    return this._traverse(1);
+  }
+
+  prev() {
+    return this._traverse(-1);
+  }
+
+  begin() {
+    this.current_index = 0;
+    return this.current_item;
+  }
+
+  end() {
+    this.current_index = this.items.length - 1;
+    return this.current_item;
+  }
+
+  is_empty() {
+    return this.items.length <= 0;
+  }
+}
+let items = new ContentItems();
+
+class KeyNav {
+  constructor(listing) {
+    this.listing = listing;
+    this._vertical_scroll_px = 100;
+    this._scroll_behavior = "smooth";
+  }
+
+  _is_scrolling() {
+    return this.listing.is_empty();
+  }
+
+  _toggle_active_element(item) {
+    item.parentElement.classList.toggle("active");
+  }
+
+  next() {
+    if (this._is_scrolling()) {
+      window.scrollBy({
+        top: this._vertical_scroll_px,
+        behavior: this._scroll_behavior,
+      });
+    } else {
+      this._toggle_active_element(items.current_item);
+      this._toggle_active_element(items.next());
+    }
+  }
+
+  prev() {
+    if (this._is_scrolling()) {
+      window.scrollBy({
+        top: -this._vertical_scroll_px,
+        behavior: this._scroll_behavior,
+      });
+    } else {
+      this._toggle_active_element(items.current_item);
+      this._toggle_active_element(items.prev());
+    }
+  }
+
+  begin() {
+    if (this._is_scrolling()) {
+      window.scroll(0, 0);
+    } else {
+      this._toggle_active_element(items.current_item);
+      this._toggle_active_element(items.begin());
+    }
+  }
+
+  end() {
+    if (this._is_scrolling()) {
+      window.scroll(0, document.body.scrollHeight);
+    } else {
+      this._toggle_active_element(items.current_item);
+      this._toggle_active_element(items.end());
+    }
+  }
+}
+let keynav = new KeyNav(items);
+
+document.addEventListener("keydown", (e) => {
   switch (e.key) {
     case "j":
+      keynav.next();
+      break;
+
     case "k":
-      window.scrollBy({
-        top: scroll_factor * scroll_vertical,
-        behavior: scroll_behavior,
-      });
+      keynav.prev();
       break;
 
     case "g":
       if (last_key === "g") {
-        window.scroll(0, 0);
+        keynav.begin();
       }
       break;
 
     case "G":
-      window.scroll(0, document.body.scrollHeight);
+      keynav.end();
+      break;
+
+    case "Enter":
+      if (items.current_item !== undefined) {
+        window.location.href = items.current_item.href;
+      }
       break;
   }
 

themes/alejandro-angulo/layouts/index.html

@@ -1,9 +1,16 @@
 {{ define "main" }}
-{{ $paginator := .Paginate (where .Site.RegularPages.ByPublishDate.Reverse "Type" "posts") }}
-{{ range $paginator.Pages}}
-<p>
-    <h3><a class="title" href="{{ .RelPermalink }}">{{ .Title }}</a></h3>
-	{{ partial "metadata.html" . }}
-</p>
-{{ end }}
+  {{ $paginator := .Paginate (where .Site.RegularPages.ByPublishDate.Reverse "Type" "posts") }}
+  {{ range $paginator.Pages }}
+    <div>
+      <h3>
+        <a
+          id="{{ .File.TranslationBaseName }}"
+          class="content-item"
+          href="{{ .RelPermalink }}"
+          >{{ .Title }}</a
+        >
+      </h3>
+      {{ partial "metadata.html" . }}
+    </div>
+  {{ end }}
 {{ end }}