golang.org/x/text@v0.14.0/cmd/gotext/rewrite.go (about)

     1  // Copyright 2017 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  package main
     6  
     7  import (
     8  	"io"
     9  	"os"
    10  
    11  	"golang.org/x/text/message/pipeline"
    12  )
    13  
    14  const printerType = "golang.org/x/text/message.Printer"
    15  
    16  // TODO:
    17  // - merge information into existing files
    18  // - handle different file formats (PO, XLIFF)
    19  // - handle features (gender, plural)
    20  // - message rewriting
    21  
    22  var cmdRewrite = &Command{
    23  	Init:      initRewrite,
    24  	Run:       runRewrite,
    25  	UsageLine: "rewrite <package>",
    26  	Short:     "rewrites fmt functions to use a message Printer",
    27  	Long: `
    28  rewrite is typically done once for a project. It rewrites all usages of
    29  fmt to use x/text's message package whenever a message.Printer is in scope.
    30  It rewrites Print and Println calls with constant strings to the equivalent
    31  using Printf to allow translators to reorder arguments.
    32  `,
    33  }
    34  
    35  func initRewrite(cmd *Command) {
    36  	overwrite = cmd.Flag.Bool("w", false, "write files in place")
    37  }
    38  
    39  func runRewrite(cmd *Command, _ *pipeline.Config, args []string) error {
    40  	var w io.Writer
    41  	if !*overwrite {
    42  		w = os.Stdout
    43  	}
    44  	pkg := "."
    45  	switch len(args) {
    46  	case 0:
    47  	case 1:
    48  		pkg = args[0]
    49  	default:
    50  		return errorf("can only specify at most one package")
    51  	}
    52  	return pipeline.Rewrite(w, pkg)
    53  }