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Copy pathgenv.go
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87 lines (77 loc) · 2.13 KB
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// Copyright 2017-2019 gf Author(https://github.com/gogf/gf). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.
// Package genv provides operations for environment variables of system.
package genv
import (
"github.com/gogf/gf/container/gvar"
"os"
)
import "strings"
// All returns a copy of strings representing the environment,
// in the form "key=value".
func All() []string {
return os.Environ()
}
// Map returns a copy of strings representing the environment as a map.
func Map() map[string]string {
m := make(map[string]string)
i := 0
for _, s := range os.Environ() {
i = strings.IndexByte(s, '=')
m[s[0:i]] = s[i+1:]
}
return m
}
// Get returns the value of the environment variable named by the <key>.
// It returns given <def> if the variable does not exist in the environment.
func Get(key string, def ...string) string {
v, ok := os.LookupEnv(key)
if !ok && len(def) > 0 {
return def[0]
}
return v
}
// GetVar creates and returns a Var with the value of the environment variable
// named by the <key>. It uses the given <def> if the variable does not exist
// in the environment.
func GetVar(key string, def ...interface{}) *gvar.Var {
v, ok := os.LookupEnv(key)
if !ok && len(def) > 0 {
return gvar.New(def[0])
}
return gvar.New(v)
}
// Set sets the value of the environment variable named by the <key>.
// It returns an error, if any.
func Set(key, value string) error {
return os.Setenv(key, value)
}
// Contains checks whether the environment variable named <key> exists.
func Contains(key string) bool {
_, ok := os.LookupEnv(key)
return ok
}
// Build builds a map to a environment variable slice.
func Build(m map[string]string) []string {
array := make([]string, len(m))
index := 0
for k, v := range m {
array[index] = k + "=" + v
index++
}
return array
}
// Remove deletes one or more environment variables.
func Remove(key ...string) error {
var err error
for _, v := range key {
err = os.Unsetenv(v)
if err != nil {
return err
}
}
return nil
}