refactor: push commands in to cmd and ev to root as library

pkg/env/env.go

@@ -0,0 +1,40 @@
+package env
+
+import (
+	"log"
+	"os"
+	"strings"
+)
+
+func Default(name, defaultValue string) string {
+	name = strings.TrimSpace(name)
+	defaultValue = strings.TrimSpace(defaultValue)
+	if v := strings.TrimSpace(os.Getenv(name)); v != "" {
+		log.Println("# ", name, "=", v)
+		return v
+	}
+	log.Println("# ", name, "=", defaultValue, "(default)")
+	return defaultValue
+}
+
+type secret string
+
+func (s secret) String() string {
+	if s == "" {
+		return "(nil)"
+	}
+	return "***"
+}
+func (s secret) Secret() string {
+	return string(s)
+}
+func Secret(name, defaultValue string) secret {
+	name = strings.TrimSpace(name)
+	defaultValue = strings.TrimSpace(defaultValue)
+	if v := strings.TrimSpace(os.Getenv(name)); v != "" {
+		log.Println("# ", name, "=", secret(v))
+		return secret(v)
+	}
+	log.Println("# ", name, "=", secret(defaultValue), "(default)")
+	return secret(defaultValue)
+}