cmd/streamdata: retry metadata entry

This enables fixing metadata when a mistake is made.

Signed-off-by: Yonah <contrib@gensokyo.uk>

cmd/streamdata/main.go

@@ -130,11 +130,12 @@ func main() {
 				defer toErr(&err)
 				isattyStd()
 				br := bufio.NewReader(os.Stdin)
+				now := time.Now()
 
+			retry:
 				v.Title = require(promptTrimNoEmpty(br, "Title: "))
 				v.Category = require(prompt(br, "Category: "))
 
-				now := time.Now()
 				year := require(promptUintFallbackBounds(
 					br, "Year: ",
 					1970, uint64(now.Year()),
@@ -161,6 +162,11 @@ func main() {
 					time.UTC,
 				)
 
+				printVOD(v)
+				if !require(promptBool(br, "Proceed? ", true)) {
+					goto retry
+				}
+
 				var resp *http.Response
 				if resp, err = http.DefaultClient.Do(req); err != nil {
 					return