init.go

     1  // Copyright 2021 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 work init
     6  
     7  package workcmd
     8  
     9  import (
    10  	"context"
    11  	"path/filepath"
    12  
    13  	"cmd/go/internal/base"
    14  	"cmd/go/internal/fsys"
    15  	"cmd/go/internal/modload"
    16  
    17  	"golang.org/x/mod/modfile"
    18  )
    19  
    20  var cmdInit = &base.Command{
    21  	UsageLine: "go work init [moddirs]",
    22  	Short:     "initialize workspace file",
    23  	Long: `Init initializes and writes a new go.work file in the
    24  current directory, in effect creating a new workspace at the current
    25  directory.
    26  
    27  go work init optionally accepts paths to the workspace modules as
    28  arguments. If the argument is omitted, an empty workspace with no
    29  modules will be created.
    30  
    31  Each argument path is added to a use directive in the go.work file. The
    32  current go version will also be listed in the go.work file.
    33  
    34  See the workspaces reference at https://go.dev/ref/mod#workspaces
    35  for more information.
    36  `,
    37  	Run: runInit,
    38  }
    39  
    40  func init() {
    41  	base.AddChdirFlag(&cmdInit.Flag)
    42  	base.AddModCommonFlags(&cmdInit.Flag)
    43  }
    44  
    45  func runInit(ctx context.Context, cmd *base.Command, args []string) {
    46  	moduleLoaderState := modload.NewState()
    47  	moduleLoaderState.InitWorkfile()
    48  
    49  	moduleLoaderState.ForceUseModules = true
    50  
    51  	gowork := modload.WorkFilePath(moduleLoaderState)
    52  	if gowork == "" {
    53  		gowork = filepath.Join(base.Cwd(), "go.work")
    54  	}
    55  
    56  	if _, err := fsys.Stat(gowork); err == nil {
    57  		base.Fatalf("go: %s already exists", gowork)
    58  	}
    59  
    60  	wf := new(modfile.WorkFile)
    61  	wf.Syntax = new(modfile.FileSyntax)
    62  	wf.AddGoStmt(modload.DefaultModInitGoVersion())
    63  	workUse(ctx, moduleLoaderState, gowork, wf, args)
    64  	modload.WriteWorkFile(gowork, wf)
    65  }
    66
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