prog

Documentation

Overview

Package prog provides the entry point to Elvish. Its subpackages correspond to subprograms of Elvish.

Index

• Variables
• func BadUsage(msg string) error
• func Exit(exit int) error
• func Run(fds [3]*os.File, args []string, p Program) int
• type DaemonPaths
• type FlagSet
  • func (fs *FlagSet) DaemonPaths() *DaemonPaths
  • func (fs *FlagSet) JSON() *bool
• type Program
  • func Composite(programs ...Program) Program

Variables

var DeprecationLevel = 18

DeprecationLevel is a global flag that controls which deprecations to show. If its value is X, Elvish shows deprecations that should be shown for version 0.X.

var ErrNextProgram = errors.New("next program")

ErrNextProgram is a special error that may be returned by Program.Run that is part of a Composite program, indicating that the next program should be tried.

Functions

func BadUsage

func BadUsage(msg string) error

BadUsage returns a special error that may be returned by Program.Run. It causes the main function to print out a message, the usage information and exit with 2.

func Exit

func Exit(exit int) error

Exit returns a special error that may be returned by Program.Run. It causes the main function to exit with the given code without printing any error messages. Exit(0) returns nil.

func Run

func Run(fds [3]*os.File, args []string, p Program) int

Run parses command-line flags and runs the first applicable subprogram. It returns the exit status of the program.

Types

type DaemonPaths

type DaemonPaths struct {
	DB, Sock string
}

type FlagSet

type FlagSet struct {
	*flag.FlagSet
	// contains filtered or unexported fields
}

func (*FlagSet) DaemonPaths

func (fs *FlagSet) DaemonPaths() *DaemonPaths

func (*FlagSet) JSON

func (fs *FlagSet) JSON() *bool

type Program

type Program interface {
	RegisterFlags(fs *FlagSet)
	// Run runs the subprogram.
	Run(fds [3]*os.File, args []string) error
}

Program represents a subprogram.

func Composite

func Composite(programs ...Program) Program

Composite returns a Program that tries each of the given programs, terminating at the first one that doesn't return NotSuitable().