Moved config set/unset to internal/config/modify.go as Store and Purge.

internal/config/modify.go

@@ -0,0 +1,83 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"strconv"
+
+	"github.com/spf13/viper"
+)
+
+// StoreValue parses value as the type of key, checks conf accepts it, sets it
+// in conf and Viper and writes the config file Viper is using. It returns the
+// parsed value and its kind.
+func StoreValue(
+	conf *JobSearchConfig, key string, value string,
+) (any, reflect.Kind, error) {
+	var confValue any = nil
+	var confType reflect.Kind
+	var err error
+
+	confType, err = conf.TypeOf(key)
+	if err != nil {
+		return nil, confType, err
+	}
+
+	switch confType {
+	case reflect.Bool:
+		confValue, err = strconv.ParseBool(value)
+	case reflect.String:
+		confValue = value
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		confValue, err = strconv.ParseInt(value, 10, 64)
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		confValue, err = strconv.ParseUint(value, 10, 64)
+	case reflect.Float32, reflect.Float64:
+		confValue, err = strconv.ParseFloat(value, 64)
+	default:
+		err = errors.ErrUnsupported
+	}
+	if err != nil {
+		return nil, confType, fmt.Errorf(
+			"config value type not accepted, expected <%s>", confType,
+		)
+	}
+
+	// Reject values the configuration itself would not accept, e.g. an
+	// unknown log level or an unparseable duration.
+	if err := conf.SetValue(key, confValue); err != nil {
+		return nil, confType, err
+	}
+
+	viper.Set(key, confValue)
+	if err := viper.WriteConfig(); err != nil {
+		return nil, confType, err
+	}
+
+	return confValue, confType, nil
+}
+
+// PurgeValue rewrites the config file Viper is using without key.
+func PurgeValue(conf *JobSearchConfig, key string) error {
+	if _, err := conf.TypeOf(key); err != nil {
+		return err
+	}
+
+	v := viper.New()
+	v.SetConfigFile(viper.ConfigFileUsed())
+
+	keys := viper.AllKeys()
+	for i := range keys {
+		k := keys[i]
+		if k != key {
+			v.Set(k, viper.Get(k))
+		}
+	}
+
+	if err := v.WriteConfig(); err != nil {
+		return err
+	}
+
+	return nil
+}