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config.go
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/
config.go
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package config
import (
"os"
"github.com/mitchellh/mapstructure"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
type ConfigConfig struct {
ConfigFilename string
}
type ConfigOptions func(*ConfigConfig)
func WithConfigFilename(filename string) ConfigOptions {
return func(cc *ConfigConfig) {
cc.ConfigFilename = filename
}
}
func changeMapstructureTags(tagName string) viper.DecoderConfigOption {
return func(c *mapstructure.DecoderConfig) {
c.TagName = tagName
}
}
func decoderHookFunc() mapstructure.DecodeHookFunc {
return mapstructure.ComposeDecodeHookFunc(
mapstructure.StringToTimeDurationHookFunc(),
mapstructure.StringToSliceHookFunc(","),
)
}
func NewConfig(opts ...ConfigOptions) (*Config, error) {
cc := ConfigConfig{}
config := &Config{}
for _, opt := range opts {
opt(&cc)
}
if cc.ConfigFilename != "" {
// Use config file from the flag.
viper.SetConfigFile(cc.ConfigFilename)
} else {
// Find home directory.
home, err := os.UserHomeDir()
cobra.CheckErr(err)
viper.AddConfigPath(home)
viper.SetConfigType("yaml")
// TODO: This should be in ~/.config
viper.SetConfigName(".abs-importer")
}
viper.AutomaticEnv() // read in environment variables that match
// If a config file is found, read it in.
err := viper.ReadInConfig()
if err != nil {
return nil, err
}
err = viper.Unmarshal(config, changeMapstructureTags("json"), viper.DecodeHook(decoderHookFunc()))
if err != nil {
return nil, err
}
return config, nil
}