Write response as soon as data is ready

Previously the entire archive had to be read before the template
is executed, thus large archives takes forever to render
from slow backing FS.

1 files changed, 14 insertions, 15 deletions

diff --git a/main.go b/main.go
index b364d20..dfc01a5 100644
--- a/main.go
+++ b/main.go
@@ -48,7 +48,6 @@ type Archive struct {
 	Title   string
 	Prev    string
 	Next    string
-	Entries []Page
 }
 
 // Type Directory represents a library directory in file system.
@@ -147,7 +146,17 @@ func main() {
 		// Render archive page
 		entries, _ := os.ReadDir(path.Join(p, ".."))
 		index := find(entries, stat.Name())
-		var pages []Page
+		prev := ""
+		if index > 0 {
+			prev = entries[index-1].Name()
+		}
+		next := ""
+		if index < len(entries)-1 {
+			next = entries[index+1].Name()
+		}
+		t.ExecuteTemplate(w, "archive-head.html",
+			Archive{ stat.Name(), prev, next })
+
 		for i, f := range cbz.File {
 			image, _ := cbz.File[i].Open()
 			defer image.Close()
@@ -155,21 +164,11 @@ func main() {
 			n, _ := image.Read(buf)
 			mime := http.DetectContentType(buf[:n])
 			if strings.HasPrefix(mime, "image/") {
-				pages = append(pages, Page{i, f.Name})
+				t.ExecuteTemplate(w, "archive-page.html",
+					Page{i, f.Name})
 			}
 		}
-
-		prev := ""
-		if index > 0 {
-			prev = entries[index-1].Name()
-		}
-		next := ""
-		if index < len(entries)-1 {
-			next = entries[index+1].Name()
-		}
-		t.ExecuteTemplate(w, "archive.html", Archive{
-			stat.Name(), prev, next, pages,
-		})
+		t.ExecuteTemplate(w, "archive-foot.html", nil)
 	})
 
 	addr := os.Getenv("PHYLACTERY_ADDRESS")