added example for FlagCounter

examples/flag-counter/flag-counter.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"fmt"
+	"github.com/akamensky/argparse"
+	"os"
+)
+
+func main() {
+	// initialize parser
+	parser := argparse.NewParser("FlagCounter", "Example of FlagCounter usage")
+
+	// create FlagCounter argument
+	opts := &argparse.Options{
+		Required: true,
+		Help:     "Will print out how many instances of the flag are found. For example, both -nn and --number --number will be 2",
+	}
+	count := parser.FlagCounter("n", "number", opts)
+
+	// parse arguments
+	err := parser.Parse(os.Args)
+
+	// check for errors in parsing
+	if err != nil {
+		fmt.Printf("Error parsing: [%+v]\n", err)
+		return
+	}
+
+	// print out the number of occurrences of the flag
+	fmt.Printf("Number of flags detected: [%d]\n", *count)
+}