Initial commit

.gitignore

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+vendor/*

Gopkg.toml

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+
+# Gopkg.toml example
+#
+# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
+# for detailed Gopkg.toml documentation.
+#
+# required = ["github.com/user/thing/cmd/thing"]
+# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
+#
+# [[constraint]]
+#   name = "github.com/user/project"
+#   version = "1.0.0"
+#
+# [[constraint]]
+#   name = "github.com/user/project2"
+#   branch = "dev"
+#   source = "github.com/myfork/project2"
+#
+# [[override]]
+#  name = "github.com/x/y"
+#  version = "2.4.0"
+
+
+[[constraint]]
+  name = "github.com/spf13/viper"
+  version = "1.0.0"

config.toml

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+[database]
+hostname = "localhost"
+port = 5432
+username = "postgres"
+password = ""
+
+[output]
+file = "out.txt"

main.go

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+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/viper"
+)
+
+type DatabaseConfig struct {
+	Host string `mapstructure:"hostname"`
+	Port string
+	User string `mapstructure:"username"`
+	Pass string `mapstructure:"password"`
+}
+
+type OutputConfig struct {
+	File string
+}
+
+type Config struct {
+	Db  DatabaseConfig `mapstructure:"database"`
+	Out OutputConfig   `mapstructure:"output"`
+}
+
+func main() {
+	v := viper.New()
+	v.SetConfigName("config")
+	v.AddConfigPath(".")
+	if err := v.ReadInConfig(); err != nil {
+		fmt.Printf("couldn't load config: %s", err)
+		os.Exit(1)
+	}
+	var c Config
+	if err := v.Unmarshal(&c); err != nil {
+		fmt.Printf("couldn't read config: %s", err)
+	}
+	fmt.Printf("host=%s port=%s user=%s pass=%s\n", c.Db.Host, c.Db.Port, c.Db.User, c.Db.Pass)
+	fmt.Printf("output=%s\n", c.Out.File)
+	fmt.Printf("%#v", c)
+}