Update libkv dependency

vendor/golang.org/x/text/gen.go

@@ -12,9 +12,14 @@ import (
 	"bytes"
 	"flag"
 	"fmt"
+	"go/build"
+	"go/format"
+	"io/ioutil"
 	"os"
 	"os/exec"
+	"path"
 	"path/filepath"
+	"regexp"
 	"runtime"
 	"strings"
 	"sync"
@@ -26,6 +31,7 @@ import (
 var (
 	verbose     = flag.Bool("v", false, "verbose output")
 	force       = flag.Bool("force", false, "ignore failing dependencies")
+	doCore      = flag.Bool("core", false, "force an update to core")
 	excludeList = flag.String("exclude", "",
 		"comma-separated list of packages to exclude")
 
@@ -61,6 +67,7 @@ func main() {
 	// variable. This will prevent duplicate downloads and also will enable long
 	// tests, which really need to be run after each generated package.
 
+	updateCore := *doCore
 	if gen.UnicodeVersion() != unicode.Version {
 		fmt.Printf("Requested Unicode version %s; core unicode version is %s.\n",
 			gen.UnicodeVersion(),
@@ -72,26 +79,52 @@ func main() {
 		if gen.UnicodeVersion() < unicode.Version && !*force {
 			os.Exit(2)
 		}
+		updateCore = true
 	}
+
+	var unicode = &dependency{}
+	if updateCore {
+		fmt.Printf("Updating core to version %s...\n", gen.UnicodeVersion())
+		unicode = generate("unicode")
+
+		// Test some users of the unicode packages, especially the ones that
+		// keep a mirrored table. These may need to be corrected by hand.
+		generate("regexp", unicode)
+		generate("strconv", unicode) // mimics Unicode table
+		generate("strings", unicode)
+		generate("testing", unicode) // mimics Unicode table
+	}
+
 	var (
-		cldr       = generate("unicode/cldr")
-		language   = generate("language", cldr)
-		internal   = generate("internal", language)
-		norm       = generate("unicode/norm")
-		rangetable = generate("unicode/rangetable")
-		cases      = generate("cases", norm, language, rangetable)
-		width      = generate("width")
-		bidi       = generate("unicode/bidi", norm, rangetable)
-		_          = generate("secure/precis", norm, rangetable, cases, width, bidi)
-		_          = generate("encoding/htmlindex", language)
-		_          = generate("currency", cldr, language, internal)
-		_          = generate("internal/number", cldr, language, internal)
-		_          = generate("language/display", cldr, language)
-		_          = generate("collate", norm, cldr, language, rangetable)
-		_          = generate("search", norm, cldr, language, rangetable)
+		cldr       = generate("./unicode/cldr", unicode)
+		language   = generate("./language", cldr)
+		internal   = generate("./internal", unicode, language)
+		norm       = generate("./unicode/norm", unicode)
+		rangetable = generate("./unicode/rangetable", unicode)
+		cases      = generate("./cases", unicode, norm, language, rangetable)
+		width      = generate("./width", unicode)
+		bidi       = generate("./unicode/bidi", unicode, norm, rangetable)
+		mib        = generate("./encoding/internal/identifier", unicode)
+		_          = generate("./encoding/htmlindex", unicode, language, mib)
+		_          = generate("./encoding/ianaindex", unicode, language, mib)
+		_          = generate("./secure/precis", unicode, norm, rangetable, cases, width, bidi)
+		_          = generate("./currency", unicode, cldr, language, internal)
+		_          = generate("./internal/number", unicode, cldr, language, internal)
+		_          = generate("./feature/plural", unicode, cldr, language, internal)
+		_          = generate("./internal/export/idna", unicode, bidi, norm)
+		_          = generate("./language/display", unicode, cldr, language, internal)
+		_          = generate("./collate", unicode, norm, cldr, language, rangetable)
+		_          = generate("./search", unicode, norm, cldr, language, rangetable)
 	)
 	all.Wait()
 
+	// Copy exported packages to the destination golang.org repo.
+	copyExported("golang.org/x/net/idna")
+
+	if updateCore {
+		copyVendored()
+	}
+
 	if hasErrors {
 		fmt.Println("FAIL")
 		os.Exit(1)
@@ -133,7 +166,7 @@ func generate(pkg string, deps ...*dependency) *dependency {
 		if *verbose {
 			args = append(args, "-v")
 		}
-		args = append(args, "./"+pkg)
+		args = append(args, pkg)
 		cmd := exec.Command(filepath.Join(runtime.GOROOT(), "bin", "go"), args...)
 		w := &bytes.Buffer{}
 		cmd.Stderr = w
@@ -163,6 +196,88 @@ func generate(pkg string, deps ...*dependency) *dependency {
 	return &wg
 }
 
+// copyExported copies a package in x/text/internal/export to the
+// destination repository.
+func copyExported(p string) {
+	copyPackage(
+		filepath.Join("internal", "export", path.Base(p)),
+		filepath.Join("..", filepath.FromSlash(p[len("golang.org/x"):])),
+		"golang.org/x/text/internal/export/"+path.Base(p),
+		p)
+}
+
+// copyVendored copies packages used by Go core into the vendored directory.
+func copyVendored() {
+	root := filepath.Join(build.Default.GOROOT, filepath.FromSlash("src/vendor/golang_org/x"))
+
+	err := filepath.Walk(root, func(dir string, info os.FileInfo, err error) error {
+		if err != nil || !info.IsDir() || root == dir {
+			return err
+		}
+		src := dir[len(root)+1:]
+		const slash = string(filepath.Separator)
+		if c := strings.Split(src, slash); c[0] == "text" {
+			// Copy a text repo package from its normal location.
+			src = strings.Join(c[1:], slash)
+		} else {
+			// Copy the vendored package if it exists in the export directory.
+			src = filepath.Join("internal", "export", filepath.Base(src))
+		}
+		copyPackage(src, dir, "golang.org", "golang_org")
+		return nil
+	})
+	if err != nil {
+		fmt.Printf("Seeding directory %s has failed %v:", root, err)
+		os.Exit(1)
+	}
+}
+
+// goGenRE is used to remove go:generate lines.
+var goGenRE = regexp.MustCompile("//go:generate[^\n]*\n")
+
+// copyPackage copies relevant files from a directory in x/text to the
+// destination package directory. The destination package is assumed to have
+// the same name. For each copied file go:generate lines are removed and
+// and package comments are rewritten to the new path.
+func copyPackage(dirSrc, dirDst, search, replace string) {
+	err := filepath.Walk(dirSrc, func(file string, info os.FileInfo, err error) error {
+		base := filepath.Base(file)
+		if err != nil || info.IsDir() ||
+			!strings.HasSuffix(base, ".go") ||
+			strings.HasSuffix(base, "_test.go") && !strings.HasPrefix(base, "example") ||
+			// Don't process subdirectories.
+			filepath.Dir(file) != dirSrc {
+			return nil
+		}
+		b, err := ioutil.ReadFile(file)
+		if err != nil || bytes.Contains(b, []byte("\n// +build ignore")) {
+			return err
+		}
+		// Fix paths.
+		b = bytes.Replace(b, []byte(search), []byte(replace), -1)
+		// Remove go:generate lines.
+		b = goGenRE.ReplaceAllLiteral(b, nil)
+		comment := "// Code generated by running \"go generate\" in golang.org/x/text. DO NOT EDIT.\n\n"
+		if *doCore {
+			comment = "// Code generated by running \"go run gen.go -core\" in golang.org/x/text. DO NOT EDIT.\n\n"
+		}
+		if !bytes.HasPrefix(b, []byte(comment)) {
+			b = append([]byte(comment), b...)
+		}
+		if b, err = format.Source(b); err != nil {
+			fmt.Println("Failed to format file:", err)
+			os.Exit(1)
+		}
+		file = filepath.Join(dirDst, base)
+		vprintf("=== COPY %s\n", file)
+		return ioutil.WriteFile(file, b, 0666)
+	})
+	if err != nil {
+		fmt.Println("Copying exported files failed:", err)
+		os.Exit(1)
+	}
+}
+
 func contains(a []string, s string) bool {
 	for _, e := range a {
 		if s == e {