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123 lines
3.0 KiB
Go
123 lines
3.0 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package base defines shared basic pieces of the commands,
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// in particular logging and the Command structure.
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package base
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import (
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"flag"
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"fmt"
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"os"
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"strings"
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"sync"
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)
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// A Command is an implementation of a xray command
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// like xray run or xray version.
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type Command struct {
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// Run runs the command.
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// The args are the arguments after the command name.
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Run func(cmd *Command, args []string)
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// UsageLine is the one-line usage message.
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// The words between "go" and the first flag or argument in the line are taken to be the command name.
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UsageLine string
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// Short is the short description shown in the 'go help' output.
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Short string
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// Long is the long message shown in the 'go help <this-command>' output.
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Long string
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// Flag is a set of flags specific to this command.
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Flag flag.FlagSet
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// CustomFlags indicates that the command will do its own
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// flag parsing.
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CustomFlags bool
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// Commands lists the available commands and help topics.
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// The order here is the order in which they are printed by 'go help'.
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// Note that subcommands are in general best avoided.
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Commands []*Command
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}
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// LongName returns the command's long name: all the words in the usage line between "go" and a flag or argument,
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func (c *Command) LongName() string {
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name := c.UsageLine
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if i := strings.Index(name, " ["); i >= 0 {
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name = name[:i]
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}
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if name == CommandEnv.Exec {
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return ""
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}
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return strings.TrimPrefix(name, CommandEnv.Exec+" ")
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}
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// Name returns the command's short name: the last word in the usage line before a flag or argument.
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func (c *Command) Name() string {
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name := c.LongName()
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if i := strings.LastIndex(name, " "); i >= 0 {
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name = name[i+1:]
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}
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return name
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}
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// Usage prints usage of the Command
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func (c *Command) Usage() {
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fmt.Fprintf(os.Stderr, "usage: %s\n", c.UsageLine)
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fmt.Fprintf(os.Stderr, "Run 'xray help %s' for details.\n", c.LongName())
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SetExitStatus(2)
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Exit()
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}
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// Runnable reports whether the command can be run; otherwise
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// it is a documentation pseudo-command such as importpath.
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func (c *Command) Runnable() bool {
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return c.Run != nil
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}
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// Exit exits with code set with SetExitStatus()
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func Exit() {
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os.Exit(exitStatus)
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}
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// Fatalf logs error and exit with code 1
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func Fatalf(format string, args ...interface{}) {
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Errorf(format, args...)
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Exit()
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}
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// Errorf logs error and set exit status to 1, but not exit
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func Errorf(format string, args ...interface{}) {
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fmt.Fprintf(os.Stderr, format, args...)
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fmt.Fprintln(os.Stderr)
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SetExitStatus(1)
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}
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// ExitIfErrors exits if current status is not zero
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func ExitIfErrors() {
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if exitStatus != 0 {
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Exit()
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}
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}
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var exitStatus = 0
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var exitMu sync.Mutex
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// SetExitStatus set exit status code
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func SetExitStatus(n int) {
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exitMu.Lock()
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if exitStatus < n {
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exitStatus = n
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}
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exitMu.Unlock()
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}
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// GetExitStatus get exit status code
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func GetExitStatus() int {
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return exitStatus
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}
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