From: Colin P. Mccabe <colin@cmccabe.xyz>
Date: Wed, 21 Nov 2018 21:56:42 +0000 (-0800)
Subject: Add pickrand.go
X-Git-Url: http://club.cc.cmu.edu/~cmccabe/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fbb7220527c04fb8b07aa777c2f46c26e35f56ed;p=cmccabe-bin

Add pickrand.go
---

diff --git a/pickrand.go b/pickrand.go
new file mode 100644
index 0000000..a21efda
--- /dev/null
+++ b/pickrand.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"math/rand"
+	"time"
+)
+
+func main() {
+	root := "."
+	if len(os.Args) > 1 {
+		root = os.Args[1]
+	}
+	files := make([]string, 0, 32)
+	err := filepath.Walk(root, func(p string, f os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if !f.IsDir() {
+			files = append(files, p)
+		}
+		return nil
+	})
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "** Error: %s\n", err.Error())
+		os.Exit(1)
+	}
+	rand.Seed(time.Now().UTC().UnixNano())
+	i := rand.Int31n(int32(len(files)))
+	fmt.Printf("%s\n", root + "/" + files[i])
+}