95 lines
2.9 KiB
Go
95 lines
2.9 KiB
Go
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// Copyright 2015 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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// licence that can be found in the LICENSE file.
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// The gomvpkg command moves go packages, updating import declarations.
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// See the -help message or Usage constant for details.
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package main
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import (
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"flag"
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"fmt"
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"go/build"
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"os"
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"golang.org/x/tools/go/buildutil"
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"golang.org/x/tools/refactor/rename"
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)
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var (
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fromFlag = flag.String("from", "", "Import path of package to be moved")
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toFlag = flag.String("to", "", "Destination import path for package")
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vcsMvCmdFlag = flag.String("vcs_mv_cmd", "", `A template for the version control system's "move directory" command, e.g. "git mv {{.Src}} {{.Dst}}`)
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helpFlag = flag.Bool("help", false, "show usage message")
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)
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func init() {
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flag.Var((*buildutil.TagsFlag)(&build.Default.BuildTags), "tags", buildutil.TagsFlagDoc)
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}
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const Usage = `gomvpkg: moves a package, updating import declarations
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Usage:
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gomvpkg -from <path> -to <path> [-vcs_mv_cmd <template>]
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Flags:
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-from specifies the import path of the package to be moved
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-to specifies the destination import path
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-vcs_mv_cmd specifies a shell command to inform the version control system of a
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directory move. The argument is a template using the syntax of the
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text/template package. It has two fields: Src and Dst, the absolute
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paths of the directories.
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For example: "git mv {{.Src}} {{.Dst}}"
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gomvpkg determines the set of packages that might be affected, including all
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packages importing the 'from' package and any of its subpackages. It will move
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the 'from' package and all its subpackages to the destination path and update all
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imports of those packages to point to its new import path.
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gomvpkg rejects moves in which a package already exists at the destination import
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path, or in which a directory already exists at the location the package would be
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moved to.
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gomvpkg will not always be able to rename imports when a package's name is changed.
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Import statements may want further cleanup.
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gomvpkg's behavior is not defined if any of the packages to be moved are
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imported using dot imports.
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Examples:
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% gomvpkg -from myproject/foo -to myproject/bar
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Move the package with import path "myproject/foo" to the new path
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"myproject/bar".
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% gomvpkg -from myproject/foo -to myproject/bar -vcs_mv_cmd "git mv {{.Src}} {{.Dst}}"
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Move the package with import path "myproject/foo" to the new path
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"myproject/bar" using "git mv" to execute the directory move.
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`
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func main() {
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flag.Parse()
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if len(flag.Args()) > 0 {
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fmt.Fprintln(os.Stderr, "gomvpkg: surplus arguments.")
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os.Exit(1)
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}
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if *helpFlag || *fromFlag == "" || *toFlag == "" {
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fmt.Println(Usage)
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return
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}
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if err := rename.Move(&build.Default, *fromFlag, *toFlag, *vcsMvCmdFlag); err != nil {
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fmt.Fprintf(os.Stderr, "gomvpkg: %s.\n", err)
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os.Exit(1)
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}
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}
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