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cmd/fiximports: -replace flag specifies canonical packages in absence of import comments

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+ Tests.

Change-Id: I0544546dda93d24aedbbfe1ffdc6882e76bfb3f8
Reviewed-on: https://go-review.googlesource.com/12940
Reviewed-by: Jason Buberel <jbuberel@google.com>
This commit is contained in:
Alan Donovan 2015-07-30 15:43:19 -04:00
parent 513c731aab
commit af0fde4393
2 changed files with 155 additions and 24 deletions
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108
cmd/fiximports/main.go
View File

@ -96,6 +96,8 @@ var (
dryrun = flag.Bool("n", false, "dry run: show changes, but don't apply them")
badDomains = flag.String("baddomains", "code.google.com",
"a comma-separated list of domains from which packages should not be imported")
replaceFlag = flag.String("replace", "",
"a comma-separated list of noncanonical=canonical pairs of package paths. If both items in a pair end with '...', they are treated as path prefixes.")
)
// seams for testing
@ -132,6 +134,8 @@ func main() {
}
}
type canonicalName struct{ path, name string }
// fiximports fixes imports in the specified packages.
// Invariant: a false result implies an error was already printed.
func fiximports(packages ...string) bool {
@ -158,13 +162,41 @@ func fiximports(packages ...string) bool {
return false
}
// noncanonical maps each non-canonical package path to
// its canonical name.
// packageName maps each package's path to its name.
packageName := make(map[string]string)
for _, p := range pkgs {
packageName[p.ImportPath] = p.Package.Name
}
// canonical maps each non-canonical package path to
// its canonical path and name.
// A present nil value indicates that the canonical package
// is unknown: hosted on a bad domain with no redirect.
noncanonical := make(map[string]*build.Package)
canonical := make(map[string]canonicalName)
domains := strings.Split(*badDomains, ",")
type replaceItem struct {
old, new string
matchPrefix bool
}
var replace []replaceItem
for _, pair := range strings.Split(*replaceFlag, ",") {
if pair == "" {
continue
}
words := strings.Split(pair, "=")
if len(words) != 2 {
fmt.Fprintf(stderr, "importfix: -replace: %q is not of the form \"canonical=noncanonical\".\n", pair)
return false
}
replace = append(replace, replaceItem{
old: strings.TrimSuffix(words[0], "..."),
new: strings.TrimSuffix(words[1], "..."),
matchPrefix: strings.HasSuffix(words[0], "...") &&
strings.HasSuffix(words[1], "..."),
})
}
// Find non-canonical packages and populate importedBy graph.
for _, p := range pkgs {
if p.Error != nil {
@ -187,11 +219,41 @@ func fiximports(packages ...string) bool {
addEdge(&p.Package, imp)
}
// Does package have an explicit import comment?
if p.ImportComment != "" {
if p.ImportComment != p.ImportPath {
noncanonical[p.ImportPath] = &p.Package
canonical[p.ImportPath] = canonicalName{
path: p.Package.ImportComment,
name: p.Package.Name,
}
}
} else {
// Is package matched by a -replace item?
var newPath string
for _, item := range replace {
if item.matchPrefix {
if strings.HasPrefix(p.ImportPath, item.old) {
newPath = item.new + p.ImportPath[len(item.old):]
break
}
} else if p.ImportPath == item.old {
newPath = item.new
break
}
}
if newPath != "" {
newName := packageName[newPath]
if newName == "" {
newName = filepath.Base(newPath) // a guess
}
canonical[p.ImportPath] = canonicalName{
path: newPath,
name: newName,
}
continue
}
// Is package matched by a -baddomains item?
for _, domain := range domains {
slash := strings.Index(p.ImportPath, "/")
if slash < 0 {
@ -200,7 +262,7 @@ func fiximports(packages ...string) bool {
if p.ImportPath[:slash] == domain {
// Package comes from bad domain and has no import comment.
// Report an error each time this package is imported.
noncanonical[p.ImportPath] = nil
canonical[p.ImportPath] = canonicalName{}
// TODO(adonovan): should we make an HTTP request to
// see if there's an HTTP redirect, a "go-import" meta tag,
@ -212,10 +274,10 @@ func fiximports(packages ...string) bool {
}
}
// Find all clients (direct importers) of noncanonical packages.
// Find all clients (direct importers) of canonical packages.
// These are the packages that need fixing up.
clients := make(map[*build.Package]bool)
for path := range noncanonical {
for path := range canonical {
for client := range importedBy[path] {
clients[client] = true
}
@ -244,7 +306,7 @@ func fiximports(packages ...string) bool {
// Rewrite selected client packages.
ok := true
for client := range clients {
if !rewritePackage(client, noncanonical) {
if !rewritePackage(client, canonical) {
ok = false
// There were errors.
@ -291,7 +353,7 @@ func fiximports(packages ...string) bool {
}
// Invariant: false result => error already printed.
func rewritePackage(client *build.Package, noncanonical map[string]*build.Package) bool {
func rewritePackage(client *build.Package, canonical map[string]canonicalName) bool {
ok := true
used := make(map[string]bool)
@ -305,7 +367,7 @@ func rewritePackage(client *build.Package, noncanonical map[string]*build.Packag
first = true
fmt.Fprintf(stderr, "%s\n", client.ImportPath)
}
err := rewriteFile(filepath.Join(client.Dir, filename), noncanonical, used)
err := rewriteFile(filepath.Join(client.Dir, filename), canonical, used)
if err != nil {
fmt.Fprintf(stderr, "\tERROR: %v\n", err)
ok = false
@ -319,8 +381,8 @@ func rewritePackage(client *build.Package, noncanonical map[string]*build.Packag
}
sort.Strings(keys)
for _, key := range keys {
if p := noncanonical[key]; p != nil {
fmt.Fprintf(stderr, "\tfixed: %s -> %s\n", key, p.ImportComment)
if p := canonical[key]; p.path != "" {
fmt.Fprintf(stderr, "\tfixed: %s -> %s\n", key, p.path)
} else {
fmt.Fprintf(stderr, "\tERROR: %s has no import comment\n", key)
ok = false
@ -331,10 +393,10 @@ func rewritePackage(client *build.Package, noncanonical map[string]*build.Packag
}
// rewrite reads, modifies, and writes filename, replacing all imports
// of packages P in noncanonical by noncanonical[P].
// It records in used which noncanonical packages were imported.
// of packages P in canonical by canonical[P].
// It records in used which canonical packages were imported.
// used[P]=="" indicates that P was imported but its canonical path is unknown.
func rewriteFile(filename string, noncanonical map[string]*build.Package, used map[string]bool) error {
func rewriteFile(filename string, canonical map[string]canonicalName, used map[string]bool) error {
fset := token.NewFileSet()
f, err := parser.ParseFile(fset, filename, nil, parser.ParseComments)
if err != nil {
@ -348,15 +410,15 @@ func rewriteFile(filename string, noncanonical map[string]*build.Package, used m
fset.Position(imp.Pos()), imp.Path.Value, err)
continue
}
p, ok := noncanonical[impPath]
canon, ok := canonical[impPath]
if !ok {
continue // import path is canonical
}
used[impPath] = true
if p == nil {
// The canonical path is unknown.
if canon.path == "" {
// The canonical path is unknown (a -baddomain).
// Show the offending import.
// TODO(adonovan): should we show the actual source text?
fmt.Fprintf(stderr, "\t%s:%d: import %q\n",
@ -367,18 +429,16 @@ func rewriteFile(filename string, noncanonical map[string]*build.Package, used m
changed = true
imp.Path.Value = strconv.Quote(p.ImportComment)
imp.Path.Value = strconv.Quote(canon.path)
// Add a renaming import if necessary.
//
// This is a guess at best. We can't see whether a 'go
// get' of the canonical import path would have the same
// name or not. Assume it's the last segment.
//
// TODO(adonovan): should we make an HTTP request?
newBase := path.Base(p.ImportComment)
if imp.Name == nil && newBase != p.Name {
imp.Name = &ast.Ident{Name: p.Name}
newBase := path.Base(canon.path)
if imp.Name == nil && newBase != canon.name {
imp.Name = &ast.Ident{Name: canon.name}
}
}

71
cmd/fiximports/main_test.go
View File

@ -40,11 +40,13 @@ func TestFixImports(t *testing.T) {
defer func() {
stderr = os.Stderr
*badDomains = "code.google.com"
*replaceFlag = ""
}()
for i, test := range []struct {
packages []string // packages to rewrite, "go list" syntax
badDomains string // -baddomains flag
replaceFlag string // -replace flag
wantOK bool
wantStderr string
wantRewrite map[string]string
@ -103,11 +105,80 @@ import (
_ "new.com/bar"
_ "new.com/one"
_ "titanic.biz/foo"
)`,
},
},
// #3. The -replace flag lets user supply missing import comments.
{
packages: []string{"all"},
replaceFlag: "titanic.biz/foo=new.com/foo",
wantOK: true,
wantStderr: `
testdata/src/old.com/bad/bad.go:2:43: expected 'package', found 'EOF'
fruit.io/banana
fixed: old.com/one -> new.com/one
fixed: titanic.biz/bar -> new.com/bar
fixed: titanic.biz/foo -> new.com/foo
`,
wantRewrite: map[string]string{
"$GOPATH/src/fruit.io/banana/banana.go": `package banana
import (
_ "new.com/bar"
_ "new.com/foo"
_ "new.com/one"
)`,
},
},
// #4. The -replace flag supports wildcards.
// An explicit import comment takes precedence.
{
packages: []string{"all"},
replaceFlag: "titanic.biz/...=new.com/...",
wantOK: true,
wantStderr: `
testdata/src/old.com/bad/bad.go:2:43: expected 'package', found 'EOF'
fruit.io/banana
fixed: old.com/one -> new.com/one
fixed: titanic.biz/bar -> new.com/bar
fixed: titanic.biz/foo -> new.com/foo
`,
wantRewrite: map[string]string{
"$GOPATH/src/fruit.io/banana/banana.go": `package banana
import (
_ "new.com/bar"
_ "new.com/foo"
_ "new.com/one"
)`,
},
},
// #5. The -replace flag trumps -baddomains.
{
packages: []string{"all"},
badDomains: "titanic.biz",
replaceFlag: "titanic.biz/foo=new.com/foo",
wantOK: true,
wantStderr: `
testdata/src/old.com/bad/bad.go:2:43: expected 'package', found 'EOF'
fruit.io/banana
fixed: old.com/one -> new.com/one
fixed: titanic.biz/bar -> new.com/bar
fixed: titanic.biz/foo -> new.com/foo
`,
wantRewrite: map[string]string{
"$GOPATH/src/fruit.io/banana/banana.go": `package banana
import (
_ "new.com/bar"
_ "new.com/foo"
_ "new.com/one"
)`,
},
},
} {
*badDomains = test.badDomains
*replaceFlag = test.replaceFlag
stderr = new(bytes.Buffer)
gotRewrite := make(map[string]string)