Add xorb selection on click

index.html

@@ -20,6 +20,7 @@
 			<h1>Visualizing Repo-level Dedupe</h1>
       <p>This visualization demonstrates the amount of <a target="_blank" rel="noopener noreferrer" href="https://huggingface.co/blog/from-files-to-chunks">chunk-level dedupe</a> across all public repos.</p>
       <p>"Dedupe factor" is defined as the number of re-uses of a given "xorb". A "xorb" is a collection of content-defined chunks, typically around 1,000 chunks comprising up to 64 MB of total data.</p>
+      <p>Click to select a row, and highlight all xorbs in other repos that have overlap with the selected repo. Double-click to clear selection.</p>
 		</div>
     <div id="vis"></div>
     <script>
@@ -28,6 +29,27 @@
         "resolve": {"scale": {"x": "independent"}},
         "width": 600,
         "height": 12,
+        "params": [
+          {
+            "name": "select",
+            "select": {"type": "point", "fields": ["repo"], "toggle": "false"}
+          },
+          {
+            "name": "xorbs_selected",
+            "expr": "pluck(data('source_0'), 'repo_xorb_selected')"
+          },
+          {"name": "any_xorbs_selected", "expr": "extent(xorbs_selected)[0] != null"}
+        ],
+        "transform": [
+          {
+            "calculate": "(select.repo != null ? indexof(select.repo, datum.repo) : -1) + 1",
+            "as": "repo_selected"
+          },
+          {
+            "calculate": "if(datum.repo_selected > 0, datum.xorb_id, null)",
+            "as": "repo_xorb_selected"
+          }
+        ],
         "data": {
           "url": "xorbs.json"
         },
@@ -44,6 +66,14 @@
             "type": "quantitative",
             "scale": {"domain": [0, 10]}
           },
+          "opacity": {
+            "condition": [
+              {
+                "test": "any_xorbs_selected && indexof(xorbs_selected, datum.xorb_id) == -1",
+                "value": 0.3
+              }
+            ]
+          },
           "tooltip": {"field": "dedupe_factor"},
           "row": {
             "field": "repo",