WIP: Mostly done with pdf client, need to add tests.

Sources/ViewController/Live.swift

@@ -195,7 +195,9 @@ extension SiteRoute.View.ProjectRoute {
       case .pdf:
         // FIX: This should return a pdf to download or be wrapped in a
         //      result view.
-        return try! await projectClient.toHTML(projectID)
+        // return try! await projectClient.toHTML(projectID)
+        // This get's handled elsewhere because it returns a response, not a view.
+        fatalError()
       case .rooms(let route):
         return await route.renderView(on: request, projectID: projectID)
       }

Sources/ViewController/Views/DuctSizing/DuctSizingView.swift

@@ -24,11 +24,20 @@ struct DuctSizingView: HTML, Sendable {
           .attributes(.class("text-error font-bold italic mt-4"))
         }
 
-        a(
-          .class("btn btn-primary"),
-          .href(route: .project(.detail(projectID, .pdf)))
-        ) {
-          "PDF"
+        div {
+          button(
+            .class("btn btn-primary"),
+            .hx.get(route: .project(.detail(projectID, .pdf))),
+            .hx.ext("htmx-download"),
+            .hx.swap(.none),
+            .hx.indicator()
+          ) {
+            span { "PDF" }
+            Indicator()
+          }
+          // div {
+          //   Indicator()
+          // }
         }
 
       }

Sources/ViewController/Views/MainPage.swift

@@ -50,8 +50,10 @@ public struct MainPage<Inner: HTML>: SendableHTMLDocument where Inner: Sendable
     meta(.content("1024"), .name("og:image:height"))
     meta(.content(keywords), .name(.keywords))
     script(.src("https://unpkg.com/htmx.org@2.0.8")) {}
+    script(.src("/js/htmx-download.js")) {}
     script(.src("/js/main.js")) {}
     link(.rel(.stylesheet), .href("/css/output.css"))
+    link(.rel(.stylesheet), .href("/css/htmx.css"))
     link(
       .rel(.icon),
       .href("/images/favicon.ico"),