support empty content given to the closestmatch callback

Author: coxley

callbacks.go

@@ -83,6 +83,11 @@ func (c *ClosestMatch) CB() Callback {
 			}
 		}
 
+		// When content is empty, don't show anything but the prompt
+		if len(content) == 0 {
+			return ""
+		}
+
 		if inp == "" { // first load or backspaced text
 			topN = content[:c.MaxShown]
 		} else if !tab {

examples/closestmatch_empty.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/coxley/rtprompt"
+)
+
+func main() {
+	issues := map[string]string{}
+	var selected string
+	cb := rtprompt.ClosestMatch{
+		Data:             issues,
+		OnSelect:         func(s string) { selected = s },
+		MaxShown:         7,
+		ShowInstructions: true,
+	}
+	prompt := rtprompt.New("Summary: ", cb.CB())
+	prompt.Wait()
+	fmt.Printf("Woohoo! You selected: %s\n", selected)
+}