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package.go
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package.go
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// Copyright 2018 Microsoft Corporation and contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"errors"
"fmt"
"go/ast"
"go/parser"
"go/printer"
"go/token"
"io/ioutil"
"os"
"path/filepath"
"github.com/spf13/cobra"
)
var packageCmd = &cobra.Command{
Use: "package <package dir> <message>",
Short: "Adds a deprecation comment to all exported types and functions.",
Long: `The package command adds a deprecation comment to all exported types and functions
in the specified package. The comment is of the form "// Deprecated: <message>".`,
RunE: func(cmd *cobra.Command, args []string) error {
return thePackageCmd(args)
},
}
func init() {
rootCmd.AddCommand(packageCmd)
}
func thePackageCmd(args []string) error {
if len(args) < 2 {
return errors.New("not enough arguments were supplied")
}
fileInfos, err := ioutil.ReadDir(args[0])
if err != nil {
return fmt.Errorf("failed to read directory: %v", err)
}
for _, fileInfo := range fileInfos {
if fileInfo.IsDir() {
continue
}
err := addDeprecationToFile(filepath.Join(args[0], fileInfo.Name()), args[1])
if err != nil {
return fmt.Errorf("failed to add deprecation comments: %v", err)
}
}
return nil
}
func addDeprecationToFile(file, message string) error {
vprintf("adding deprecation comments to %s\n", file)
fset := token.NewFileSet()
node, err := parser.ParseFile(fset, file, nil, parser.ParseComments)
if err != nil {
return err
}
// walk the AST, for each exported type and func add deprecated message
ast.Inspect(node, func(n ast.Node) bool {
switch x := n.(type) {
case *ast.GenDecl:
if isExportedSpec(x.Specs) {
addDeprecationComment(x.Doc, message)
}
case *ast.FuncDecl:
if x.Name.IsExported() {
addDeprecationComment(x.Doc, message)
}
// return false as we don't care about the function body.
return false
}
return true
})
// write the updated content
f, err := os.OpenFile(file, os.O_WRONLY|os.O_TRUNC, 0)
if err != nil {
return err
}
defer f.Close()
return printer.Fprint(f, fset, node)
}
func addDeprecationComment(cg *ast.CommentGroup, message string) {
if cg == nil {
return
}
// create a new comment and add it to the beginning of the comment group
nd := []*ast.Comment{
&ast.Comment{
Text: fmt.Sprintf("// Deprecated: %s", message),
Slash: cg.Pos() - 1,
},
}
cg.List = append(nd, cg.List...)
}
func isExportedSpec(list []ast.Spec) bool {
for _, l := range list {
if s, ok := l.(*ast.TypeSpec); ok {
return s.Name.IsExported()
}
}
// assume it's exported
return true
}