igcfs/go-igc

// Copyright ©2015 Ricardo Rocha <rocha.porto@gmail.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 provides the command line tools for goigc.
//

package main

import (
    "fmt"
    "os"

    "github.com/spf13/cobra"
    "github.com/spf13/viper"
)

var cfgFile string

// RootCmd is the base command when called without any subcommands.
var RootCmd = &cobra.Command{
    Use:   "igctool",
    Short: "Parse, analyse and optimize tracks.",
    Long:  `Parse and analyse flight tracks in IGC format.`,
}

// Execute adds all child commands to the root command 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)

    // Command flags
    RootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.igctool.yaml)")

}

// Read in config file and ENV variables if set.
func initConfig() {
    if cfgFile != "" { // enable ability to specify config file via flag
        viper.SetConfigFile(cfgFile)
    }

    viper.SetConfigName(".igctool") // name of config file (without extension)
    viper.AddConfigPath("$HOME")    // adding home directory as first search path
    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())
    }
}