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, programs ...Program) int
• type Flags
• type Program

Variables

var DeprecationLevel = 15

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.

Functions

func BadUsage

func BadUsage(msg string) error

BadUsage returns an error that may be returned by Program.Main, which requests the main program to print out a message, the usage information and exit with 2.

func Exit

func Exit(exit int) error

Exit returns an error that may be returned by Program.Main, which requests the main program to exit with the given code. If the exit code is 0, it returns nil.

func Run

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

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

Types

type Flags

type Flags struct {
	Log, CPUProfile string

	Help, Version, BuildInfo, JSON bool

	CodeInArg, CompileOnly, NoRc bool
	RC                           string

	Web  bool
	Port int

	Daemon bool
	Forked int

	DB, Sock string
}

Flags keeps command-line flags.

type Program

type Program interface {
	// ShouldRun returns whether the subprogram should run.
	ShouldRun(f *Flags) bool
	// Run runs the subprogram.
	Run(fds [3]*os.File, f *Flags, args []string) error
}

Program represents a subprogram.