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path.go
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/
path.go
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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// 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 config
import (
"os"
"path"
"strings"
)
// WithConfigFileFlag is an option for the manager that automatically enables the config file flag
// and tries to infer it from the working directory, user home directory and user configuration directory.
// The Option can only be used once.
func WithConfigFileFlag(flag string) Option {
return func(m *Manager) {
if m.configFlag != "" {
panic("WithConfigFileFlag option should only be used once")
}
m.configFlag = flag
// Use the default from the config if set.
if def := m.viper.GetStringSlice(flag); def != nil {
m.viper.SetDefault(flag, def)
return
}
file := m.name + ".yml"
dotfile := "." + file
var paths, envPaths []string
if dir, err := os.Getwd(); err == nil {
paths = append(paths, path.Join(dir, dotfile))
envPaths = append(envPaths, dotfile)
}
if dir, err := os.UserHomeDir(); err == nil {
paths = append(paths, path.Join(dir, dotfile))
envPaths = append(envPaths, path.Join(dir, dotfile))
}
if dir, err := os.UserConfigDir(); err == nil {
paths = append(paths, path.Join(dir, dotfile))
envPaths = append(envPaths, path.Join(dir, dotfile))
}
m.defaultPaths = paths
m.viper.SetDefault(flag, paths)
if f := m.flags.Lookup(flag); f != nil {
f.DefValue = "[" + strings.Join(envPaths, ",") + "]"
} else {
m.flags.StringSlice(flag, envPaths, "Location of the configuration file")
}
}
}