do configs through env

config.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"errors"
+)
+
+type Configs struct {
+	Verbose bool
+	Dbhost  string
+	Dbname  string
+	Dbport  int
+	Port    int
+}
+
+func NewConfig() *Configs {
+	return &Configs{
+		Verbose: true,
+		Dbname:  "itslog",
+		Dbport:  5432,
+		Port:    80,
+	}
+}
+
+func (c *Configs) validate() error {
+	if c.Dbhost == "" {
+		return errors.New("must specify dbhost (export ITSLOG_DBHOST=blah.local)")
+	}
+	return nil
+}

main.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"github.com/kelseyhightower/envconfig"
+	"log"
+)
+
+func main() {
+	log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
+	config := NewConfig()
+	err := envconfig.Process("ITSLOG", config)
+	if err != nil {
+		log.Fatal(err)
+	}
+	if err := config.validate(); err != nil {
+		log.Fatal(err)
+	}
+	log.Printf("%+v", config)
+}