sascha-andres/go-template

// Copyright © 2018 Sascha Andres <sascha.andres@outlook.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package cmd

import (
    "fmt"
    "os"

    homedir "github.com/mitchellh/go-homedir"
    "github.com/spf13/cobra"
    "github.com/spf13/viper"
)

var cfgFile string

// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
    Use:   "go-template",
    Short: "access to go templates for project creation",
    Long: `go-template is a templating system based on text/template
and a yml description to bootstrap your projects. Mainly written
to use with GO projects this can be used for every language.

See https://github.com/sascha-andres/go-template`,
}

// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
    if err := rootCmd.Execute(); err != nil {
        fmt.Println(err)
        os.Exit(1)
    }
}

func init() {
    cobra.OnInitialize(initConfig)

    // Here you will define your flags and configuration settings.
    // Cobra supports persistent flags, which, if defined here,
    // will be global for your application.
    rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.go-template.yaml)")
    rootCmd.PersistentFlags().StringP("storage", "s", "${HOME}/.go-template", "where to store templates")
    rootCmd.PersistentFlags().String("log-level", "warn", "log level to use")

    viper.BindPFlag("storage", rootCmd.PersistentFlags().Lookup("storage"))
    viper.BindPFlag("log-level", rootCmd.PersistentFlags().Lookup("log-level"))
}

// initConfig reads in config file and ENV variables if set.
func initConfig() {
    if cfgFile != "" {
        // Use config file from the flag.
        viper.SetConfigFile(cfgFile)
    } else {
        // Find home directory.
        home, err := homedir.Dir()
        if err != nil {
            fmt.Println(err)
            os.Exit(1)
        }

        // Search config in home directory with name ".go-template" (without extension).
        viper.AddConfigPath(home)
        viper.SetConfigName(".go-template")
    }

    viper.AutomaticEnv() // read in environment variables that match

    // If a config file is found, read it in.
    if err := viper.ReadInConfig(); err == nil {
        fmt.Println("Using config file:", viper.ConfigFileUsed())
    }
}