Split Print into Save / Save & Print -- saving no longer requires also printing

Name is now required (it's the only thing identifying what got saved),
and printing is an explicit separate choice instead of an implicit
side-effect of naming something.

app.rb

@@ -219,15 +219,22 @@ end
 
 post '/shipping/zpl' do
   zpl = params[:zpl].to_s
+  name = params[:save_as].to_s
   if zpl.strip.empty?
     flash 'ZPL text is empty', 'warning'
+  elsif name.empty?
+    flash 'Name is required to save', 'warning'
   else
-    LABEL_REPO.save(name: params[:save_as], type: 'zpl', content: zpl) unless params[:save_as].to_s.empty?
-    begin
-      print_to_datamax(zpl)
-      flash 'ZPL sent to printer', 'success'
-    rescue => e
-      flash "ZPL print failed (#{e.message})", 'danger'
+    LABEL_REPO.save(name: name, type: 'zpl', content: zpl)
+    if params[:commit] == 'save_and_print'
+      begin
+        print_to_datamax(zpl)
+        flash "Saved '#{name}' and sent to printer", 'success'
+      rescue => e
+        flash "Saved '#{name}', but print failed (#{e.message})", 'danger'
+      end
+    else
+      flash "Saved '#{name}'", 'success'
     end
   end
   redirect '/upload'
@@ -296,15 +303,22 @@ end
 
 post '/epson/raw' do
   content = params[:content].to_s
+  name = params[:save_as].to_s
   if content.strip.empty?
     flash 'Receipt text is empty', 'warning'
+  elsif name.empty?
+    flash 'Name is required to save', 'warning'
   else
-    LABEL_REPO.save(name: params[:save_as], type: 'escpos', content: content) unless params[:save_as].to_s.empty?
-    begin
-      print_raw_escpos(content)
-      flash 'Sent to Epson printer', 'success'
-    rescue => e
-      flash "Epson print failed (#{e.message})", 'danger'
+    LABEL_REPO.save(name: name, type: 'escpos', content: content)
+    if params[:commit] == 'save_and_print'
+      begin
+        print_raw_escpos(content)
+        flash "Saved '#{name}' and sent to printer", 'success'
+      rescue => e
+        flash "Saved '#{name}', but print failed (#{e.message})", 'danger'
+      end
+    else
+      flash "Saved '#{name}'", 'success'
     end
   end
   redirect '/epson'