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gcmd.go
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gcmd.go
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// Copyright GoFrame Author(https://goframe.org). 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/rglujing/gf.
//
// Package gcmd provides console operations, like options/arguments reading and command running.
package gcmd
import (
"github.com/rglujing/gf/container/gvar"
"github.com/rglujing/gf/internal/command"
"os"
"strings"
)
var (
defaultCommandFuncMap = make(map[string]func())
)
// Custom initialization.
func Init(args ...string) {
command.Init(args...)
}
// GetOpt returns the option value named <name>.
func GetOpt(name string, def ...string) string {
Init()
return command.GetOpt(name, def...)
}
// GetOptVar returns the option value named <name> as gvar.Var.
func GetOptVar(name string, def ...string) *gvar.Var {
Init()
return gvar.New(GetOpt(name, def...))
}
// GetOptAll returns all parsed options.
func GetOptAll() map[string]string {
Init()
return command.GetOptAll()
}
// ContainsOpt checks whether option named <name> exist in the arguments.
func ContainsOpt(name string) bool {
Init()
return command.ContainsOpt(name)
}
// GetArg returns the argument at <index>.
func GetArg(index int, def ...string) string {
Init()
return command.GetArg(index, def...)
}
// GetArgVar returns the argument at <index> as gvar.Var.
func GetArgVar(index int, def ...string) *gvar.Var {
Init()
return gvar.New(GetArg(index, def...))
}
// GetArgAll returns all parsed arguments.
func GetArgAll() []string {
Init()
return command.GetArgAll()
}
// GetWithEnv is alias of GetOptWithEnv.
// Deprecated, use GetOptWithEnv instead.
func GetWithEnv(key string, def ...interface{}) *gvar.Var {
return GetOptWithEnv(key, def...)
}
// GetOptWithEnv returns the command line argument of the specified <key>.
// If the argument does not exist, then it returns the environment variable with specified <key>.
// It returns the default value <def> if none of them exists.
//
// Fetching Rules:
// 1. Command line arguments are in lowercase format, eg: gf.<package name>.<variable name>;
// 2. Environment arguments are in uppercase format, eg: GF_<package name>_<variable name>;
func GetOptWithEnv(key string, def ...interface{}) *gvar.Var {
cmdKey := strings.ToLower(strings.Replace(key, "_", ".", -1))
if ContainsOpt(cmdKey) {
return gvar.New(GetOpt(cmdKey))
} else {
envKey := strings.ToUpper(strings.Replace(key, ".", "_", -1))
if r, ok := os.LookupEnv(envKey); ok {
return gvar.New(r)
} else {
if len(def) > 0 {
return gvar.New(def[0])
}
}
}
return gvar.New(nil)
}
// BuildOptions builds the options as string.
func BuildOptions(m map[string]string, prefix ...string) string {
options := ""
leadStr := "-"
if len(prefix) > 0 {
leadStr = prefix[0]
}
for k, v := range m {
if len(options) > 0 {
options += " "
}
options += leadStr + k
if v != "" {
options += "=" + v
}
}
return options
}