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// +build go1.5
package rename
import (
"bytes"
"flag"
"fmt"
"go/format"
"go/parser"
"go/token"
"go/types"
"io/ioutil"
"golang.org/x/tools/go/loader"
)
var dryRun = flag.Bool("dryrun", false, "Dry run")
var verbose = flag.Bool("verbose", false, "Verbose")
type packageRenames struct {
operations map[string]string
shapes map[string]string
fields map[string]string
}
type renamer struct {
*loader.Program
files map[*token.File]bool
}
// ParsePathsFromArgs parses arguments from command line and looks at import
// paths to rename objects.
func ParsePathsFromArgs() {
flag.Parse()
for _, dir := range flag.Args() {
var conf loader.Config
conf.ParserMode = parser.ParseComments
conf.ImportWithTests(dir)
prog, err := conf.Load()
if err != nil {
panic(err)
}
r := renamer{prog, map[*token.File]bool{}}
r.parse()
if !*dryRun {
r.write()
}
}
}
func (r *renamer) dryInfo() string {
if *dryRun {
return "[DRY-RUN]"
}
return "[!]"
}
func (r *renamer) printf(msg string, args ...interface{}) {
if *verbose {
fmt.Printf(msg, args...)
}
}
func (r *renamer) parse() {
for _, pkg := range r.InitialPackages() {
r.parseUses(pkg)
}
}
func (r *renamer) write() {
for _, pkg := range r.InitialPackages() {
for _, f := range pkg.Files {
tokenFile := r.Fset.File(f.Pos())
if r.files[tokenFile] {
var buf bytes.Buffer
format.Node(&buf, r.Fset, f)
if err := ioutil.WriteFile(tokenFile.Name(), buf.Bytes(), 0644); err != nil {
panic(err)
}
}
}
}
}
func (r *renamer) parseUses(pkg *loader.PackageInfo) {
for k, v := range pkg.Uses {
if v.Pkg() != nil {
pkgPath := v.Pkg().Path()
if renames, ok := renamedPackages[pkgPath]; ok {
name := k.Name
switch t := v.(type) {
case *types.Func:
if newName, ok := renames.operations[t.Name()]; ok && newName != name {
r.printf("%s Rename [OPERATION]: %q -> %q\n", r.dryInfo(), name, newName)
r.files[r.Fset.File(k.Pos())] = true
k.Name = newName
}
case *types.TypeName:
if newName, ok := renames.shapes[name]; ok && newName != name {
r.printf("%s Rename [SHAPE]: %q -> %q\n", r.dryInfo(), t.Name(), newName)
r.files[r.Fset.File(k.Pos())] = true
k.Name = newName
}
case *types.Var:
if newName, ok := renames.fields[name]; ok && newName != name {
r.printf("%s Rename [FIELD]: %q -> %q\n", r.dryInfo(), t.Name(), newName)
r.files[r.Fset.File(k.Pos())] = true
k.Name = newName
}
}
}
}
}
}
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