Publish the size of the book before download

- Closes: #62

lib/template.go

@@ -22,6 +22,7 @@ import (
 var tmpl_funcs = map[string]interface{}{
 	"strings_join": stringsJoin,
 	"download_url": downloadUrl,
+	"size2mb":      size2mb,
 }
 
 type Status struct {
@@ -97,6 +98,10 @@ func downloadUrl(book database.Book) string {
 	return fmt.Sprintf("/download/%s/%s", book.ID, fileName)
 }
 
+func size2mb(size int) float32 {
+	return float32(size) / (1024.0 * 1024.0)
+}
+
 type DevTemplateExecutor struct {
 	assetsPath string
 	tpe        string

templates/book.html

@@ -44,6 +44,7 @@ function delBook(){
 		{{if .Tags}}<dt>Tags</dt> <dd>{{range .Tags}}<a href="/search/?q=tag:{{.}}">{{.}}</a>, {{end}}</dd>{{end}}
 		{{if .Isbn}}<dt>ISBN</dt> <dd>{{.Isbn}}</dd>{{end}}
 		{{if .Date}}<dt>Date</dt> <dd>{{.Date}}</dd>{{end}}
+		{{if .FileSize}}<dt>Size</dt> <dd>{{printf "%.2f" (size2mb .FileSize)}} MB</dd>{{end}}
 		{{if .Lang}}<dt>Lang</dt> <dd><a href="/search/?q=lang:{{.Lang}}">{{.Lang}}</a> </dd>{{end}}
 		</dl>
 	</div>