Allow to pack imports (-i) with comma

Allow to pack multiple imports with comma:
  goeval -i=fmt,time 'fmt.Println(time.Now())'

Closes #8.

Author: dolmen

main.go

@@ -46,6 +46,17 @@ func (*imports) String() string {
 }
 
 func (imp *imports) Set(s string) error {
+	// Allow -i fmt,os
+	// Comma is not allowed in import path
+	if p1, remainder, ok := strings.Cut(s, ","); ok {
+		err := imp.Set(p1)
+		if err == nil {
+			imp.Set(remainder)
+		}
+		return err
+	}
+
+	// Optional aliasing with [alias=]import
 	var alias, path, version string
 	var ok bool
 	if alias, path, ok = strings.Cut(s, "="); !ok {

main_test.go

@@ -65,3 +65,18 @@ func Example_flag() {
 	// -x
 	// toto.go
 }
+
+func Example_import() {
+	goeval(`-goimports=`, `-i`, `fmt`, `fmt.Println("OK")`)
+	goeval(`-goimports=`, `-i=fmt`, `fmt.Println("OK")`)
+	goeval(`-goimports=`, `-i`, `fmt`, `-i`, `time`, `fmt.Println(time.Time{}.In(time.UTC))`)
+	goeval(`-goimports=`, `-i`, `fmt,time`, `fmt.Println(time.Time{}.In(time.UTC))`)
+	goeval(`-goimports=`, `-i=fmt,time`, `fmt.Println(time.Time{}.In(time.UTC))`)
+
+	// Output:
+	// OK
+	// OK
+	// 0001-01-01 00:00:00 +0000 UTC
+	// 0001-01-01 00:00:00 +0000 UTC
+	// 0001-01-01 00:00:00 +0000 UTC
+}