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root.go
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root.go
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package cmd
import (
"fmt"
"os"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"github.com/spf13/viper"
)
var cfgFile string
var vpr = viper.New()
// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
Use: "go-exif-extractor",
Short: "Extracts the exif data from images in a directory and subdirectories",
Long: `Extracts the exif data from images in a directory and subdirectories`,
SilenceUsage: true,
}
// 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() {
err := rootCmd.Execute()
if err != nil {
os.Exit(1)
}
}
func init() {
cobra.OnInitialize(initConfig)
rootCmd.AddCommand(extractCmd)
rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.config.yaml)")
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if cfgFile != "" {
// Use config file from the flag.
vpr.SetConfigFile(cfgFile)
} else {
// Find home directory.
home, err := os.UserHomeDir()
cobra.CheckErr(err)
// Search config in home directory with name ".askGPT" (without extension).
vpr.AddConfigPath(".")
vpr.AddConfigPath(home)
vpr.SetConfigType("yaml")
vpr.SetConfigName(".config")
}
vpr.AutomaticEnv() // read in environment variables that match
// If a config file is found, read it in.
if err := vpr.ReadInConfig(); err == nil {
fmt.Fprintln(os.Stderr, "using config file:", vpr.ConfigFileUsed())
// Add the config file flags to the cobra commands.
viperToCobraFlags(rootCmd, vpr)
viperToCobraFlags(extractCmd, vpr)
}
}
// viperToCobraFlags copies the values from viper to cobra flags.
func viperToCobraFlags(cmd *cobra.Command, vpr *viper.Viper) {
cmd.Flags().VisitAll(func(f *pflag.Flag) {
if vpr.IsSet(f.Name) {
_ = cmd.Flags().Set(f.Name, vpr.GetString(f.Name))
}
})
}