Source file src/pkg/cmd/go/internal/modcmd/init.go

     1	// Copyright 2018 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// go mod init
     6	
     7	package modcmd
     8	
     9	import (
    10		"cmd/go/internal/base"
    11		"cmd/go/internal/modload"
    12		"os"
    13		"strings"
    14	)
    15	
    16	var cmdInit = &base.Command{
    17		UsageLine: "go mod init [module]",
    18		Short:     "initialize new module in current directory",
    19		Long: `
    20	Init initializes and writes a new go.mod to the current directory,
    21	in effect creating a new module rooted at the current directory.
    22	The file go.mod must not already exist.
    23	If possible, init will guess the module path from import comments
    24	(see 'go help importpath') or from version control configuration.
    25	To override this guess, supply the module path as an argument.
    26		`,
    27		Run: runInit,
    28	}
    29	
    30	func runInit(cmd *base.Command, args []string) {
    31		modload.CmdModInit = true
    32		if len(args) > 1 {
    33			base.Fatalf("go mod init: too many arguments")
    34		}
    35		if len(args) == 1 {
    36			modload.CmdModModule = args[0]
    37		}
    38		if os.Getenv("GO111MODULE") == "off" {
    39			base.Fatalf("go mod init: modules disabled by GO111MODULE=off; see 'go help modules'")
    40		}
    41		if _, err := os.Stat("go.mod"); err == nil {
    42			base.Fatalf("go mod init: go.mod already exists")
    43		}
    44		if strings.Contains(modload.CmdModModule, "@") {
    45			base.Fatalf("go mod init: module path must not contain '@'")
    46		}
    47		modload.InitMod() // does all the hard work
    48	}
    49	

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