Move argument parsing to separate file/function

1 files changed, 32 insertions, 0 deletions

diff --git a/args.go b/args.go
new file mode 100644
index 0000000..adcaa6b
--- /dev/null
+++ b/args.go
@@ -0,0 +1,32 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+// The arguments to this program
+type args struct {
+	Radix uint
+}
+
+func parseArgs() (args, error) {
+	if len(os.Args) == 2 {
+		if radix, err := strconv.ParseUint(os.Args[1], 0, 0); err == nil {
+			if radix > 1 {
+				return args{uint(radix)}, nil
+			} else {
+				return args{}, errors.New("Radix must be an integer above 1.")
+			}
+		} else {
+			return args{}, fmt.Errorf(
+				"Argument must be an integer above 1 [%w].", err)
+		}
+	} else if len(os.Args) < 2 {
+		return args{}, errors.New("Please provide an argument (radix to study).")
+	} else {
+		return args{}, errors.New("Too many arguments provided.")
+	}
+}