feat: add u.RandomLetters helper

README.md

@@ -106,6 +106,9 @@ func PathExists(path string) bool
 func PrettyJSON(input interface{}) string
     PrettyJSON returns an indented JSON representation of the passed input.
 
+func RandomLetters(n int) string
+    RandomLetters returns a string containing 'n' random letters.
+
 func SafeExec(cmd *exec.Cmd) string
     SafeExec runs a command and return a string containing the combined standard
     output and standard error. If the program fails, the result of `err` is

depaware.txt

@@ -22,6 +22,7 @@ moul.io/u dependencies: (generated by github.com/tailscale/depaware)
         io/ioutil                                                    from moul.io/u
         math                                                         from compress/flate+
         math/bits                                                    from compress/flate+
+        math/rand                                                    from moul.io/u
         os                                                           from archive/zip+
         os/exec                                                      from moul.io/u
         os/signal                                                    from moul.io/u

rand.go

@@ -0,0 +1,14 @@
+package u
+
+import "math/rand"
+
+const randomLetters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+// RandomLetters returns a string containing 'n' random letters.
+func RandomLetters(n int) string {
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = randomLetters[rand.Intn(len(randomLetters))]
+	}
+	return string(b)
+}

rand_test.go

@@ -0,0 +1,21 @@
+package u_test
+
+import (
+	"fmt"
+	"math/rand"
+
+	"moul.io/u"
+)
+
+func ExampleRandomLetters() {
+	rand.Seed(42)
+	fmt.Println(u.RandomLetters(8))
+	fmt.Println(u.RandomLetters(8))
+	fmt.Println(u.RandomLetters(8))
+	fmt.Println(u.RandomLetters(42))
+	// Output:
+	// HRukpTTu
+	// eZPtNeuv
+	// unhuksqV
+	// GzAdxlgghEjkMVeZJpmKqakmTRgKfBSWYjUNGkdmdt
+}